November 1982 $2.49 Yr

November 1982 $2.49 YrIssue It256

Amateur Radio'sTec hnic al Journa l

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OX-118Awards-l 22SateUltes-124Reader $ervlce-l30New Products-134Review-l39Dealer 01rectory-162Propagatlon-162

701 Remote ContrOI-14

'1 A Wayne Green Publicat ion

Tempo MARSer[SJ Get the $-1 o ff those crowded ham

c hannels Expand your coverageabove a nd below t he a mateur band

WB6IQN

CW and the Apple II~ The simplicity of BASIC plus the

speed of machine language equals areer-petect Morse kevboard

N5MR

Everyman's Audio Amplifier[SJ Meke t his one-chip amp a perma

ne nt part 01 your test benc h. It'S ,J. neasy proje ct lor bell inning expenmenters W 3KBM

Speed Demon[S] How fast wa s that' Find out with

this wpm duplav for Hf',J. th·s 1410keve r K4ZHM

Kever on a Shoestring[SJ Ha ms ilre dleelp and so is this kever.

Big spendpr~ will build tbe oelcoe.two-chsp verstoo WBSPPV

I Got My Ticket! Now WhaHA look a t what Elmer forgot to tell you

Nl ll

Award-Winning Programrf:;jJ Ceenncate bunters, cut your paper!.dJ wo rk down to Sill' Let your Pet

track your quest toe excellenceWB2CH

22

10

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14

42

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32

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70 Never Say 01e-6Clrcults-l09,l12Funl-ll0Ham Help-lll .l46

72 Social Events-113Contests-114letters-11S

74 RrrY Loop-116

TVRO Q & A: Part III~ lNAs are e~pensilo'e, but roiling: your

own is ,J. lOSing proposmonWBl,J POP

SImpl er tha n commercial cootrollers, this hornto-br_ umt nevf'l'tht>less features push-botton bandchanging and frequencv selt'thon,scenmng, and expanded coverage.

N2CW

A Perfect "10"[S] Timer, counter, logic probe - l 0

func tions in all That's the MultiBoard O ne , a nd you can build it

W A2BHB

Remote-Control Your 1C-701

Automatic Beam AimerI\...) Here's the scoop on add ing set-and

forget convemenre to your rotatorcontrol w orks with most commoncontrol boxes K9AZG

life-Support System for HIs[SJ At home Of m the car, thiS do-t

yourself charger and accessoev box(Quid be the best friend yourhandie-talkie ever had WB6BHI

WhaUAnother Audio Filter Project![S] Yup. And even the mos t mod-

ern receivers benefit from thi s Q RMcrus her W4MU

A Tuner for Antenna FanalicsAnyone e~pt"flm{"fltlng with antennas needs CI darned good tUl'M;'r Coostreet thiS one and S,J.Io't' yourfln,J.ls Staff

Digital BasicsThis is no timt' to be ,J. digital ilhteratePMt III revea ls the secrets of multivihra tDrS, shift registers, a nd other notoriousdevices K41 1'V

The Money-Maker Power Supply[S] Need 12 volts for your tr,J. nste lve r'

Save h,J.lf the cost of ,J. commer(i,J. 1umt by ,J.Sl.{'lTlbhng: thiS 25-Ampmonster WA6TTY

The Sound of Silence[S] Bee p'! Your T$-l 00 is off the ,J.ir,

Charhe HB9 Bl U

Build the Re-Fuser[SJ It's a self-eeplacmg fuse Why blow

one when you C,J.n blow two''SCN

No Smoking in the Ham Sha ck[SJ Overvoltage kills sohd-state finals

Protect yours foe Sloo N7Jl

carrier isreceived thenresume scan.or resume on carrier drop,

The MOlt Compact AllMobIles on the Martr:... Fits inthe smallest Of croces. Stocking.matching Mobile Mounts forcomplete mobilecommuniCations for you car

Men10IY lockup. When thecoro-cuc-ert backup j)ONetunit is installed on the back ofthe IC-25A Of IC-45A. memcxvwill be maintained whiletransferring the unit from powersource to cowe source If theunit is not removed from oowecit w ill maintain memory evenwhen turned off w ith or withoutthe IC-BU1,

"* ~ II C O MITheWorld System

Pulling the squelch knob outplaces the unit into low power.Both the high and low powermay be independen tly set tooccomodate yoursimplex/repeater requirements oramplifier input c haracteristics,

Nor/I..., Capability. Use ofthis button on the IC-25A Of theWICK button on the IC-45A. inthe duplex mode. cuowsonetouch monitoring of the repeaterinput frequency If simp lexoperation is cossnse you willknow instantly,

Scanning. PuShing the SISbutton in itiates the scanc ircuitry, With the mode switchin a rnerTlOlY position the unitwill scan a ll 5 memories plus the2 VFO frequenc ies.

With the mode SWitch in aVFO position, the unit will scanthe entire band Of the portiOn Ofthe band defined by memories1 and 2 Full band scan orprogram band scan is selectedfrom the front panel in the IC25A. internally on the IC·45A,

Both units hove internallyswitched scanning choices ofadjustable delay period otter a

Lo PwrlWlW

Hi Pwr25WlOW

IC·25AIC-45A

PrIortty ChoAny memory chonnemov be monitored foraetivify on a sample baSI. r:y:y5 seconds. without disruption ofa QSO conducted on a VFOfrequency.

LED lor M...,. Showsstrength of received signal aswell as relative transmitterou tput from the fully protectedfinal RF amplifier. APe(automatic cower control) isused to detect S'NR and adjustthe power output to a sofe level.

SI~tuO~StCTIdara 600 KHz crrse initializesinto radio at tum on. O ffset rTlO'r'be changed bv pressing thepriorify button while in VFOopem tion. Rotating the maintuning knob will now changethe offset up or c:i::l'Nn and theoffset will be displayed on thefrequency readout.

Adjustable Powef leY"s.

VFO •15 KHz25 KHz

VFO A5 KHz5 KHz

5 M-.nort.. Ins'ent access'0 rrost used frequencies. VK> Ainformation is transferred to the

selected memcxvby" pushing the

write ( IC-25A~'"WICK IC

a )button.

IC-BU1•

25 wott/5 memories/2scannin~ systems In a 2 ~H x5'hW x 7 0 package Is what hasmade the eew-tc-use IC·25A themost popular 2 meter FMmobile tronscelver ever. NowICOM presents the second holfof Its mobile duo...IC-45A. TheIC·45A coven 440-449.995 MHz.Both transceivers are suppliedwith teuentcnee microphonesstandard.

Duct YFO'.. Dua! VFO's g ivean extra stored frequency forscanning ( rnerTlOlY scan scans 5memories plus 2 VFO's) andeach \IfO has a d ifferent tuningrate for easy QS(,

ICOMATleiiCo,h:... 2112-1161hAYI!' NE, 0e-IIewe.WA 96004(206)4541-a 155/J331 to-eococo Drr.oe.SuTe307, 001kh.1X 75234(214)620·2780.'" i1Q~ >pt'Ol\ooIlOi '6 c.. OPP C»OI'I">ClIP oro::l .w,eo ro cto~ ""'lhcuI~ 01 ~riOi' '" ICOM rodooI i'9'1IkoI1II'f • .oaoed FCC~~~ "'iiSliO''6

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linear Integrated Circuits8038 395 l ...393 9 1 ...OX), 90lfl51 75 l M]]3 99 MC1~5a 59lO!>3 '19 l"" ~'·8 35 "'C l !> l~ ']9l051 I J9 LMI41.' 4 H "£55 5 4 5lMlOl 4 5 l M741 71 " 155 8 9 8l MlO1 4 9 l M7.8 . 9 ..E585 1 ' 5l ",)l1 95 LMIl'O 1 69 ..£55 3-< 199l M3111 I IS l"" ~5 8 69 " £55 38 "5l "'JH 90 1.M1 800 ' ~ 9 SSMlOIO 150LMl39 79 l ""18'8 3 49 SSM2020 1 SoO, "'31>8 90 W ' 889 199 5S>.QOlO 1SOl ... 3 77 ' . 9 l M2900 69 551oQOo1O ISOl"']80,,·I . 1 15 l MJ900 119 5SM2QoI4 575l "']111 1 r l MJ905 1 49 55~5 8 s.oWJU J ' 9 l ""J 9 U 3 79 XAll06 5 ' 9l M J~ 1 9 5 l ""J 91 5 ] 19 XFlol l ]6 99LMJ88 99 LM39 ' 6 ] 19 xFlol l. ' 1 95( ""J81 '.9 L"""'500 3 19 XRHII 1 99

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about

yourquickly

Why work in the d a rk? Your SWRmeter or your res ista nce norsebridge te lls o nty half the s to ry, Getthe inst rument that re a lly works,the Palomolt Engineers R ·X NOiseBridge. Use it to c hec k you ran tennas from 1 to 100 MHl. Anduse ,1 m you r shack to adjustresonant freq u llncies o f both ser iesand parall el tuned c irc u its . Wo rksbetter than a dip meter and costs alo t less. Send fo r o u r free brochure.

Fully gU,llranleed by the o rig in ato ro f t he R ·X Noise Bridge.

ORDER YOURS NOWI

The Pal omar Engineers R -X NoiseBridge te lls you if you r antenna isresonant or no t ,lind , if it is not ,whether it is 100 lon g or too s hor t .All th is rn one measurementreading. A nd It works just as wellwith ham-band·o nl y recewera ,11$

w ith general coverage equ ipmentbecause , t g,ves perfect nullreadmgs even w hen the antenna isn ot reso nan t . It gives resistance a ndreactan ce readings on d ip o le s ,m verted Vees, q uads, beams,mult iband trap dIpoles andve rticals . No sta nc n is completewithout this up·to ·d ate instrument,

If th e re is o ne p la.ce in y o u r st at io nw here yo u cann o t risk uncertainresu lts it is in you r a n tenna.

Thf! Pflce IS ~.9!> in tM U,S and CanadaAdd $3.00 Sh'PPlngiHafloll',nll .calIfornia reSIde-nlS all<! nles ta. ,

• l earn th e truthy ou r ante nna.• F in d it sf requen cy.• Adju st it tooperati ng frequen cyand easily.

PalomarEngineersBox 455, Escondido. CA . 92025

Phone: 17141 747-3343

R-X Noise Bridge

Elm StreetPelertlOrOugh NH IJ3ol.58

Pt>one: 8lXHl24-TI38

Circulation Offices:

Pine StreetP1Iterbo<OIigh NH ~58

Phone: 6OJ.924-~11

Advertising Offices:

Canada ar>d M.~ lco-S27_97/1 Y"ar onIy. U.S. lunds. Fo, e lg n autlaceIT\Ilil-$<<.9711 year only, U,S, l undao"",n on U.S. bank. Foreign airmall-plea!ltl lnqulre.

Editorial Offices:

73, Ame,- RMiio's TechniCel Joumel(lSSN CJC$8.901 111 1$ published monWyby 73, Inc.. e subsidiary 01 Werne Gr.",fee, 80 Pine Sl'eet, Peterborough NHlXM56. Seeond class PQSlall8 pakl atPelerborough NH 03458 and at additional mal ll 'lQ oIfK:es. Enti ra contfl<l ts copy.r1ght ltl t9ll2, Wayne Green, Inc, Allrll/hts 'aS8f\'ed. No part or this PUblica.·Hon may be r8prlnted 01" otherwise repro.duced without wri tten permission fromthe pubjlSheo', Microtilm EdIHon _Unl.Y9rIIlty Microri lm, Ann Arbor "' I 46106.Postmast".., Send adcIress changes to73, Subscrlptk)n ServIces, PO Box 931,Fermingdale NY 11731.

Elm 5'_1PetOl<borough N H IJ3ol.58

PhQnIl: 603-924-90171

Write to 73, Subscri ption Department,PO Box 931, Farmingdale NV 11131.FQf r_welS and changes oI-.Jdren.Inclu<le the eddress label from yourmoet recenl Is sue of 73. FQf gIft SUP).tcl1ptk)ns. includfl your r\ilme and address as wetl as those of gift recj.pient• .

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Contributions in tile form 0 1 ............crop's w 'l l'I dr. wings atId/(lr eeeeeg.~ are ...elc:ome .fIll will be eon._.., for possible publQllon, WeCIOn 8HIJmfI no responSibi lity lor lossor damage 10 any malerial. P\w.M&1'1(:10....tampecl. selhddteaaedenvelope ",ilh N eh SlJbmiUion. Pay·menl tor tile U58 01 any unsolll;:llft\lmaterl.1 will be mad9 upon acceptance, All cont ributions should be 0:11·' otClad to 'he 73 ed itorial emcee." How to Writ. tor 73" " " Idellnea ...• ••lIable upon request.

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4 73 Magazine . November, 1982

R7A Receiver• CONTINUOUS NO COMPROMISE 0 to 30 MHzfrequency coverage.

• Full passband tuning (PBD .Newl NB7A Noise Blanker supplied as standard.

• State-of-the-Art features of the TR7A. plus addedflexibility with a low noise 10 dB rf amplifier .Newl Standard ultimat e selectivity choices include thesupplied 2.3 kHz ssb and 500 Hz cw crystal f ilters. and9 kHz a-m seiectrvtty. capability f or three accessorycrystal filters plus the two supplied . including 300 Hz.1.8 kHz. 4 kHz. and 6 kHz. The 4 kHz fi lter. when usedwith the R7A's Synchro-Phase a-m detector. providesa-m reception with greater frequency response within anarrower bandwidth than convent ional a-m detection.and sideband selection to m inimize interference potential.

• Front panel pushbutton cont rol of rf preamp. a-m / ssbdetector. speaker ON /OFF sw itch. i-f notch f ilter.reference-derived calibrator signal. three agc releaset imes (plus AGe OFF). integral t 50 MHz frequencycounter / digital readout f or external use, and ReceiverIncremental Tuning (Rll).

The andoffer performance and versatility

for those who demand the ultimate!

TR7A Transceiver• CONTINUOUS FREQUENCY COVERAGE - 1.5 to 30 MHz fullreceive coverage. The optional AUX7 provides a to 1.5 MHzreceive plus transmit coverage of 1.8 to 30 MHz. for futureAmateur bands. MARS. Embassy. Government or Commercialfrequencies (proper authorization required].

• Fu ll Passband Tuning (PSn enhances use of high rejectiona-pete crystal filters.New! Both 2.3 kHz ssb and SOO Hz cw crystal f ilters. and 9kHz a-m selectivity are standard. plus provisions for twoadditional f il t ers . These B-pole crystal filters in conjunctionwith careful mechanical /electrical design result in realizableultimate rejection in excess of 100 dB.New ! The very effective NB7 Noise Blanker is now standard .

New l Built in lightning protection avoids damage to solid -statecomponents from lightning induced transients.Newl Mic audio available on rear panel t o facilitate phone patchconnection.• state-ct-ee-art design combining solid-state PA.up-conversion. high-level double balanced 1st m ixer andfrequency synt hesis provioeo a no tune-up. broadband . highdynamic range transceiver.

The "Twins" System• FREQUENCY FLEXIBILITY. The TR7A /R7A combination appropriate use of the TR7A's Ref cont rol (Receiveroffers t he operator, particularly the nx'er or Contester. fre- Controlled Transmit). DSR is implemented by m ixing the twoquency control agility net avai lable in any ot her system. The audio signals in the R7A·Twins·· of fer the only system capable of no-comprom ise • ALTERNATE ANTENNA CAPABILITY. The R7A's AntennaDSR (Dual Simultaneous Receive). Most transceivers allow Power Splitter enhances the DSR feature by allowing the usesome external receiver cont rol. but the "Twins" provide of an add itional antenna (ALTERNATE) besides the MAINinstant transfer of transmit frequency control t o the R7A antenna connected to the TR7A (t he t ransmitting antenna).VFQ. The operator can listen to either or both receiver's All possible splits between the two antennas and the twoaudio. and instantly determine his transmitting frequency by system receivers are possible.

Specificat ions. avanabmty and prices subject to change Without not ice or obligation,

~ see your Drake dealer or writeIe.,:" ?>~. for additional Information.

COMING SOON: New RV75 Synthesized VFOCompatible with lRS and 7-L1ne Xcvrs/ Rcvrs

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R. L DRAKE COMPANY . 540 Richard Street. Miamisburg. OhIO 4 5342 • Phone (5131 866-2421 • Tele1l 288.() 17 • Patent pend ing

I

editorial by Wayne Green

W2NSD/~

NEVER SAY DIE

For that mat ter, authors of articles on construction projectsshould remember thai 73 is readin o...er 200 countries and that inmost of them parts are darnedhard to come by. Thus, if there isany way to do it, try to use commonly available parts . .. or atleast suggest such as replacements if you'...e used a 1963tran·sretor in your unit. A builder inChile will not be happy if youmerely speci fy a Radio Shackpart number .. . give a bit morein detai ls since his Radio Shackmay not carry the full line.

CIRCUITS CIRCUITS CIRCUITS

Some years ago I began reprinting liIt1e circuits out of toreign elect ronics magaz ineswhich I thought might interestthe more dedicated expenmanter. They were presented withvery little backup information., . just enough for the expertenceo builder to put the projecttogether and get it working.We're running thai sectionagain and would like to have yousend in little circuits for almostanything. You don't have to puttogether a Whole article-justthe circuit, the parts values, anda hint of what it will do. Perhapsyou ' ...e found a crrcun fromsome other (non-ham) magazinewhich readers might find of vatue... or from a book. We'll scanthe foreign magazines and seewhat we can find for you. Youdon't have to draft the circui ts.Just sketch Ihem clearly, snowing all parts values. If there areany special parts, show whatthey are and where they can beobtained. The address is Cir·cuus. Editorial Offices. 73 Mag·enne. Peterborough NH 03458,By the way, don't forget to include your choice of book fromthe Aadio Bookshop, which we'llsend you when your circuit ispublished.

amaze me so far. Let's getcracking and writing. I'llpublish and pay.

One of the main reasons why73 is so treasured by DX hams isthat it runs more constructionprojects than any other hammagazine in EngliSh in theworld. We can't come close tothe Japanese ham magazine,but then they have about threetimes as many acu...e hamsthere as we do, so that's natural.If I could get someone to translate the Japanese construct ionprojects, I could put ou t a couple

lea...e those for Ham Radio, ilthey stay af loat.

While it may go without saying that I'm hoping you willwrite up any construction projects you de...elop, let me makesure that there is no misunderstanding here. If you designsomething which might be ofinterest to the rest of 73 readers. I hope you'll write it up.Type the article double-spaced,leave generous margins, get afriend with a good camera totake art-gallery-class photos o fyour gem ... and let's nave it.

Sure, it's fun to operate. ButI've ne...er gotten so wrapped upin operating that I missed ameal. Now building .. . many isthe time I've started working ona project and found myself looking at the rising sun, ha... ingmissed dinner, midnight snack,and all those usual bufferingpick-me-ups in between. Hell,building someth ing is more funthan coffee ice cream.

And yes, you can go fa irly tarafield. Sure, we're mostly interested in amateur radio, but thatwon't stop us from publishinginteresting projects which aremvor...ed with other aspects oflife such as photography, computers, and so on. You'll get myattent ion the fastest wi th gadgets which tie computers andamateur radio together. I knowas well as you that we have thet oo l s 10 make incrediblechanges in communicationsover the next few years. II's gelling time for us to grab tncsetools and carve out some oreneer territory with niqh-speedMorse, Any, or ASCII ... orwhalever pleases you.

We ha...e the paris to make incredibly sophisticated repeaters . . . yet I' ...e seen l ill ie to

era of a high interest in bu ildingelectron ic gadgets.

The recent emphasis on relatively simple building projectsin 73 has brought in quite a bitof congratulatory mai l. It's apprecia ted. You know, when Istarted 73, back in 1960, one oft he basic reasons I felt that themagazine was needed was toencourage hams to build more.As the editor, I'd had one hell ofa battle with Ihe publisher ofCOo...er this. He wanted monthly columns, which were a lotcheaper to publish. I'd bui lt Ihemagazine up from a real loserto a big winner with construeuon ... and found myself fired.So I started 73and got right at itwith construction projects.

Just to make sure that youknow right off when you look atthe lable of content s on theco...er, we 'll put a ecroennq-rronlogo by each project . Mind you,these are not going 10 be enband transectvers which couldtake you a year to build. I'll still

TECHNICAL EDITOR WANTED

The search is on! We're looking for a knowledgeable ham tobecome Technical Editor of 73 Magazine. If you enjoy oursman-const ructron-crotect format and can tell a good ci rcuitfrom a bummer, then you're a prime candidate.

Duties of the Tech Editor include checking the technical accuracy of articles, working with authors to get the best newmanuscripts. making sure 73 publishes timely re... tews of thelatest ham gear, c limbing the tower to repair the 2O-meterbeam, installing Wayne's new mobile rig s, etc. There is plenty01 opportunity for fun, too, working contests from W2NSD,learning about microcomputers, mountaintopping from thedrive-up peak just down the road.

Furthermore, Peterborough just happens to be located inone of the most beautiful areas of the country. The quality oflife is superb. Sound interesting? If you are a non- smoker,we'd like to hear from you. Resumes should be sen t toJefl DeTray, Wayne Green, lnc., Peterborough NH 03458.

WHERE'S THE SOLDER?

For years. the pride o f myworkbench wa s my 3O().Waltsoldering iron . I looked tor it theother day, thinking I m ightframe it as a historic remnantof a long lost past , and couldn'tfind it. Well, I don't need thaiold aoo-wat ter anymore anyway. These days, a simple penc i l iron is enough to do irreparable damage. Some of thesedamned chips we use todaywou ld probably seu-cestruct ifjust allowed in the room withthe 300-Walt iron. But the factis that though the tools havechanged, we're gell ing into an

6 73 MagaZine • November, 1982

R-SOO"Now hear this".. .digital display,easy tuningThe R · BOO is an affonbbly priced, b.l&bperformance general coverage communJc.dODS receiver covering ISO kHz to 30 MHz to30 bands . Use of PLL s ynthesb ed drcultryprovides mmmnm ease of operadon.R-BOO FEATURES:0 150 kHz to 30 MHz co ntinuous coverage .

AM. 55H. o r CWo0 30 bands . each I MHz wtde . fo r easier tuning.o Ftve dl¢ll frequency display. wlth I kHz

resolution.0 6 kH.z IF fitter for AM Iwtde). a nd 2. 7 kHz

utte r for SSB. CW a nd AM Inarrowl.o Up-conversion I'LL c irc uit. for Imp ro ved

senstuvt ty. serecuvny. a n d s tabutry.

o Communications type no ise blanker e lim inates "pulse-ty pe" no ise.

o RF Atten ua to r allows 20 dB a ttenuation o fstrong srgnars.

o Tone co ntrol. 0 Front moun ted speaker.0 ' 5 ' meter. with I to 5 5 1NPO ·S· sc-ale. plus

standard scale.o Coaxial a nd 'lire ante nna tennlnals.0 100. 120 . 2 20 . a nd 240 VAC, 50'60 Hz.

Setecto r swnch on rear panel.o OptJonal13.8 VDC operatio n. u s ing DCK"I

cable kit .o Other features tn t-tude carrying ha n dle.

head phon e jack. a n d record jack .Optional acce s so ri es for R-600 and R-lOOO;o DCK.l DC Cable kll . 0 S P-loo External

S peaker.o HS·6. HS-5. HS-4 Head phones .o HC-IO Digi ta l World Clock .

High performance, easy tuning,digital displayT he R-l OOO high performance commun.ic.dons receiver covers 200 kHz t o 30 MHzin 30 bands. An up-c onve rsion PLLsynt hesized circuit provides improvedsensitivity, selectivity, and s tsbillt y,R -lOOO FEATURES:o Covers 200 kHz to 30 MHz.0 30 bands. each I Ml lz wtde.o Flve-dl~1 freq uency dj~pla }" 'lith I-kHz

resotu uon and a natog dia l with prec ise geardial mechanism.

o Buill-In 12-hollr quartz d igita l t-lock/rlmcr.o RF s tep a ttenuato r.o T h ree IF fil ters for optimu m AM. 55n. CWoo Effective noise blanker. 0 Tone control.o Burlt-tn -t-mch s pea ker. 0 Dimmer swnch.o w ire a nd coax a n te n na termmals.o Voltage se lec to r fo r 100. 120 . 220. and 240

VAC. Operates o n 13 .8 VDC with optionalDCK·l kit.

TS-530S"Cents-ational" ...IFsh ift digit al displa 0 If" shift tu nes out illlerfenng 0 HIT/XIT front panel con trol

, y, slWlals. allows tndependem fin" ·tunin~narrow-wide fil ter switch 0 Narrow/wide fil ler selector of n'ee!\'" o r transnutThe TS-530S SSB/CW switch for CW and/or 55B. In-quencn-s.t I 160 10 0 Butlt-t n speech processor. for Optional accessories:ransee ver covers - me te rs increased ta lk power.us in g th e latest most sdv d 0 SI'-230 e-xternal speukt-r wi th

, ance 0 Wid e receiver dynamic range selectable audio fil te rs.circuit technology. y et a t an with ereater immunity to .afro,d• • te price '" 0 VFO ·2.t0 remote a na loe VFO .... ...... . overload. - ,..,

o VFO-230 remote digital VFO.TS-53OS FEATURES: 0 Two 6146B's In fina l. allows 0 AT-230 antenna luner/SWR/o 160-10 meters. LSB. US B. CWoall 220W PEP/ ISO W DC In put power meter.

amate-ur- frcqucnrtcs. Induding on a ll bands . 0 MC·50 des k mn-rophonenew 10. lS. and 24 Mllz bands . 0 Advanced smgre-con vers ton 0 KIH deluxe VFO knob.Reretves \VWV on JO M Hz. PL L . fo r be tter s tability. Imp ro ved 0 YK-8 8C (500 H;/;) o r YK·88CN

o Built -in dlgllal display (six digits. spurious cbaractensucs. (270 Hz) cw nner.nuorescem tubcsl . .....lth 0 Adjustable n orse-blan ker. wi th 0 YK-88SN 0 .8 kill) narrowa nalog dial. front panel threshold control. SSB Illter.

Ef)!S!N~~9.9,91111 West Walnut, Compton, California 90220

TS-SSOT he TS-660 " QUA D BANDERcovers 6 , 10. 12. 15 m eters .o FM. SSB (USB). CWoa nd AMo Dual digital VFO 'so Digital displayo IF shift bu ilt·ino 5 memories \\i th memory scano UP/ DOWN microphone .o All mode squelcho No ise bla nkero CW sem i brcak-m/sroeroneo IOW an 5 5 B. CWo FM:

4 W o n AM.Optional accessories:0 1'5 -20 power supplyo VOX-4 speech processor/v ox0 5 1'·120 Externa l s peakero MII-IOO Mobile mounlo YK-88C. YK-88 CN CW fil lerso YK-88A AM fil ler.

I

" I'm the guy you were talking to on 2 meters! Please follow me to our yachtland ing for dinner! "

Well . . . 1Can Dream, Can't I? by Bandel Linn K4PP

o si, OF THE MONTH: AG5X

This month's winning est, is from Bob Jackson AG5X of WebsterTX. Bob has a stunningly simple ultra-modern OSl design. The cans ign is presented visually around the upper left-hand perimeter ofthe card. The causrcn is displayed in modern type in the lower right·hand space balancing the image and contributing to the overallpleasing effect o f the card.

To enter 73 MagaZine's OSl of the Month Contest send your OSlin an envelope to: Editorial otuces. 73 Magazine, Peterborough NH03458. Specify a book from 73's Radio Bookshop (located elsewherein this mag aZine). Ent ries which are not iQan envelope or do not select a book will not be considered .

/

hundred pages a month o fthings lor you to build.

I've ment ioned before that ifyou have a OX fr iend you canhelp him a lot by giving him asubscription to 73. The rneqe zine gets positively worn out inmost countries. A lew yearsago, when the dollar was weak,they had no problem getting themagazine , but today it's almostprohibitive in many countries.Of cou rse, behind the Iron Curtain they are not permitted tosend money for maq azine subscriptions, so they have to depend ent irely on the friendshipof fe llow hams who are more tortunate in where they live.

Con tinued on page 140

CQ FAi l S CODE TEST!

One of our readers in NewMexico sent in an enve lope hereceived from our friends atCO. On the cover is a bunch o fMorse code. The reader translated the code for us , Chuckling

STAFF

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8 73 Magazine • November, 1982

4

Mil..,-" SfrJnJo(E" \ \'A1BHB

PO 80' .'>8Pine Hill NI owm

A Perfect 1110"Timer, counter, logic probe-10 functions in all. That's the

Multi-Board One, and you can build it.

Ed. Nole: WA2BHB's art ic le was one of the honorable mention winners in our Home·Brew Contest. Mike will be receiving a $50 bonus in addltion 10 his norma l article payment.

,

An assembled MB-I. A comp lete kit o f all parts and a C10 ref/ow .m/dercd printed circuitboard is available for $12 postpaid from W-5 Engineering Corp., PO Box .'i8, Pine Hill NJ08021 ; telephone (20 1}852~)269.

10 73Magazine • November, 1982

The Mult i-Boa rd One(MB-l) sta rt ed out as a

ci rcu it to give a courtesvbeep ind icating t ime-out reset on my repeater. A q uickprototype showed that witha few ext ra com ponents, thecircuit co uld be a handygadget to have in the shac k,too. Being a home-brew nut,

I'm always need ing an extragated signal source, anothertrigger, an osci llator, o r lustone more logic level ind ica tor, e tc. I a lways seem to beone short of whatever It is Ineed to prototype a new design. Well , the MB-1 was theanswer to my problems Itsat isfied the two basic re -

nu irements to be an addilion to my bench: It w ascheap. and it did more thano ne thing (10 in tac t l ].

The MB-1 as designed isa ll o n one 1 Y." X 2 1/i ~ print ed c ircuit board and canpe rfor m the followi ng func tions:

• Variable signa l ge ne rato rup to 500 kH z• Ad ju s tab le p o s i t ivegated astable osci llator• Adju stable n e g at ivegated astable osci llator• Ad ju sta ble p o si ti vegated mo nostable• Adju s t ab le neg a t iv egated monosteble• Adjusta ble timer wit hnormally off output• Adjustab le timer withno rmally on output• TTliCMOS logic probe,with aud ible and LED output ind icato rs• Pulse stretc he r• Repeater beeper

Fig. 1 shows the schemat ic. 1t is simple and easy tobui ld . The photo shows acom pleted uni t. Fig. 2 showsthe connect ion/jumpe r assig nme nts needed to c reatea ny of the various MB-1funct ions, See Fig. 3 fo rco m po ne nt layout withjum per ho le assignme ntsla be led with le tte rs

All adjustments fo r oscil lat or frequen c y , pu lselength, and outpu t level areon the printed circ uit hoardYou ma y want to replace theboard-mou nted tr impots

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with mu lntum panel-mount ed units and the timing capacitor ca n be mou ntedwith add itio na l capacitorson a rota ry wafe r switc h soyou can have severa l rangesavailabl e. The variations areendless and, for a few dollars. you can create a lot ofuseful test gea r for theshack.

Theory of OperationThe Multi-Board O ne uses

a basic RC osc illator with anenable signa l being provided by a 555 t imer setup inva rious trigger modes, Onehalf of a 401 1 quad NAN Dgale is set up with a posi tiveenable input at pin 1 drivenby the output of the 555

t ime r. The output of p in 3 ofthe 555 timer is no rmall ylow, so the 401 1 oscillator isoff . When pin 3 goes high,the osci ll a tor turns on. Pin 2of the 555 is the trigger inpu t. When a negat ive-go ingpulse causes the voltage at

Fig. 1. MB-1 schematic.

this point to drop to belowone-third of Vee. the outputof the 555 (pin 3) goes highand the 4011 oscillator turnson, If pin 2 of the 555 is heldlow (grounded), the oscillator ac ts as a generator.

The pulse length potent i-

o rneter cont ro ls the durat io n o f the high output ofthe 555 Ipm 3, po int F). Anything 10k O hms or greatercan be used , The larger thevalue of this potentiomete rand the larger the va lue of( 1 , the longer the "on" du ra-

Function Input Output Interconnections

1. Signal 1. None 1. Point A 1. Point F jumpered toGenerator Ac signal , ground

will drive8-0 hms & up

2. Beeper and 2. Point C through 2. Point A 2. Jumper point E to FPosit ive Gated 22k resistor Pulse o f acAstab le

3. Beeper and 3. Point 0 with a 3. Point A 3. NoneNegative Gated negative-going Pulse 01acAstable pu lse

4. Posit ive 4. Same as #2 4 . Point G 4, Same as 1#2Trigger Dc pu lseMonostable

5. Negat ive 5. Same as 1#3 5 Same as #4 5. NoneTr iggerMonostable

6. Audible CMOS 6. Tie points 6. Point A 6. Point 10 to Fl ogic Probe 8 & 9 together. Ac signal Connect po int B to(See Note I#t) Put a 100k re- to speaker power source of

sister from 8 CMOS circuit being& 9 to ground. checked.Points 8 & 9 arenow the Input.

7. CMOS Logic 7. Same as #6 7. Same as #6 7. Same as It6Probe with for audio.LED output For LED, positive

LED leg to point G.other lag th roughtk to ground

8. CMOS l ogic 8. Same as #6 8 Same as #6 or 8. Same as #6Probe with 1#7 as desi redPulse St retcher(See Note 1#2)

9. Reverse Logic 9. Same as #6 9. Same as #6 9. Point t o to pointslor #6,7,8 or #7 12 & 13. Point 11 to F.

Note "1 ; Set duration po ten tiome ter to min imum so there is no delay.Note "2: Set du ration potentiometer to position of desired " pulse stretch" length.All instruct ions assume ground and power connections are correct.

Fig. 2. Hookup connection function chart.73Magazin e • November,1982 11

•

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simulated microphones. Ano ther is used as a CMOSspare logic probe. 1 partlcularly like the audible fe atu reso I can hook it to ant:' partof a c ircu i t and not have tolook at it to know w hat is 1;0

ing on. And vet another IS

being u sed as a ba sic455-kH z signa l generator forro ugh app li cat io ns, And lastbu t not least. ant' is the origina t " beeper" for mv Port aPcater repeater.

You will probably think ofm ore appl icat ions for thisc ircu it a fter you have madea few. Figs 2 and 5 shouldget vou up and running Atter you have put a few ofthese modules to work.you 'l l p ro babl y w onder howvou got along Without them !

I'm mort' than happy toan swer any questions or prov ide any application ass istance you may need However, please prov ide anSASE. This greatly speeds upthe a n swer proce ss andkeeps rne from d estro v ingthe househo ld budget.

W -S l ngmeenng ha s aco m plete kit of all parts inc lud ing a PCB for $1 2{X)postpaid in th e U.S.A (W -S! nai neenng. PO Box 58,Pine H ill NJ 00(21). .

Checkout and Setup

The fastest Wily to verifythat your M13-1 works is toconf igure II as ,1 generatorHook up the board as perFig 2, fu nction 1 Fig 5show s sample phvsica l conf igu ra tions , so you canmake sure vou have everything correc t. Set R-DSC atm id -range and R.()UTPUTfor maximum audio , Afteryou applv Vee, you will heara tone from the spea ke r. Ifno output, vary the R.()SCand R.()UTPUT se tt ings. Ifyou sti ll don't hea r anything,start check ing for bad ICs,i ncor rec t w ir ing. soldershorts, etc

Applications for the MS-1

I have found the M8-1 tobe the most usefu l andcheapest li ttl e c ircu it I'vedesiened. I have one in twod ifferent testers acting as

preach. Fig. J shows the pICtorlal layout o f the PCB. Fig.4 is a foil view of the actualprinted c ircu it layout. Partsare not entrea t, but it \iOUuse cheap part s, the c ircu itperformance is signi f icant lydegraded Sinn' this circu itis so small , It pa vs to mefirst-class primp parts .

•

range, but above 500 kHz,stabi lity becomes a problemfor such a simple circuit .

A buffered input is avail ab le by using the 2N2222A.It a lso acts as an inverter.

The output level from thec ircu it for the astable andosc ill ator m odes is controlled by the 10k.Qhm output potentiometer. A s designed, the c ircuit w ill drivean B-Ohm or greater speaker. In a reasonably quietroom. you can hear the dU

die output quite well.

Construction

BUIlding of the ci rcuit isvery easy if you use theprinted ci rcuit board ap-

..,I ' yl_·_·...,...,

C~IP TO oc PQIOEP0' CIPC... T UOtOE "TEST

bl

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non. Timing can be set frommilliseconds to hours. Notetha t ( 1 must be a highgrade, verv -low-le ak ag«electrolytic c apacito r .Cheap or surplus capacitorshave far too much leakage,and the c irc u it will n OI workwith them.

The frequency of oscillat ion is co nt rolled by the potent io meter labe led OSc.This potentiometer can befrom several Ohms to megohms. The higher the value.the lower the frequency ofosc illation The output Irequencv is deterrnmed by the.05-u F capac itor and R-oSC.You can get this circuit towork up into the m egahertz

C~IP TO C;~O QO' CllO(;UI'u fOOE" TU T

Fig 5. Sample applicat ions. (a) Hookup tor audio signal generator /tunction # 1) (b) C\-10Slogic probe wit h LED indicator(function #7) (c) Repeater beeper (indicates timeo ut reset)with n~a ti\'e pulse trigger (iuncuoo #J)

12 73Magazine " November, 1982

g-pin DIP socket2N2222A transistor47-uF, 16 V de capacitor22k, 'I. -W resistor22.2k, 'I. ·W resistors470k, 'I.-W resistor1k resistorl OOk, 'Io ,W resistor11 ~/. Red LED

Part s ListBare PCBNE5551CCD401 1BE rc10k trimpot (Panascntc aOA14)2 SOOk trimpots (Panasonic aOA56).Ol-uF bypass capac itor, 50 V dc.1Q.uF capac itor, 50 V de (2).047 metallized polyester capaci torH)-pin DIP socket

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... 5", LiSl 0 1 AdV<lms~rs on page 730 73 Magaz ine · November, 1982 13

Remote-Control Your IC-701Simpler than commercial controllers, this home-brew unit

nevertheless features push-button band changing and frequencyselection, scanning, and expanded coverage.

,

Glenn Willim.m N1C W612 AUfh A H'nueOcean NI 0771 2

Soon after purchasing my701 , 1 became inter

ested in e xp lo r i n g theremote-con trol capabi li t ies

Front view.

of the rad io . I w as not will ing to spend the money forthe manufacture r's unit ,but I also did not needmany of the bui lt-in featu res obv iously intendedfor use with their co m pa nion 2-mete r set. the IC-211Some cautious experi ment ing with the accessory connector on the rear panelledto the design of thi s relat ive ly sim ple cont rol uni twh ich ca n perform all theoperat ions I feel are necessary for operation on the HFbands. Basicall y, this unitcan perform the followingfunct ions:• push-button cont ro l o fbandswitching• f requency selec t io n• manual frequency scanning (fast or slow)

• ex ten sion o f frequencyrange o f sta nda rd IC-701

Theory of Operation

In order to understandthe operat ion of the remote-control unit. the requ irements for control l ingthe IC-701 m ust f ir st be exam ined .

The synthesizer in the1( -701 contains two presetta b le up-down cou nterswhi ch cont rol the programm able d iv ider in t he phaselo c ked loop (PLL), onecounter for each of the twovfo posit io ns selectab le ont he front panel . The f requency d ata is encoded andread in serially, and in theno rm al mode of operat ionthe da ta contains four charac ters, i.e., af ter the seria l

' ~ ~ O yt ~ c . 'U T R"

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ru.. ,"O AOO L,..'ut QSC'"l" W A

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VO~TAG[

PIIOPORTlO "_LTO 8 _ .. 0

TO PLL ""' 0 ..CLOC .

Side view.

14 73 Magaline . November, 1982

Fig. 1. Block d iagram.

'!-'J,!C~ir.cuits on small module inside TUN'& haages to our outstanding filters

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If you write RTTY computer programs, call us. We are looking for new ideas in softwa re.

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panel of the IC-701 . The fre-. .quency pro gra mmmg In-puts a re a lways active andare te rminated inte rnall yeithe r by resistors to groundor within the PLL l SI unit.The analog voltage inputfor bandswitchlng becomesactive o nly when the bandswitch on the front panel ofthe IC-701 is p laced in theexterna l posit ion .

dat a of the first fou r characters is entered. any succeed ing data is ignored until the co unters are againclea red .

Automat ic bandswitc hing is accomp lished by astepping relay w hich is dr iven by a di fferenti al co m parator . A front-panel switc hselec table tap on a vol taged ivide r chain is comparedto a simila r voltage-d ivide rcha in switc hed by the step" Ci rcuit Desc ript ionping relay. W hen the tw o Knowing the types of sigvo ltages are approximatel y nals req uired and the furequal , the relay is de-ener- ther requi rements wh ich Iglzed . imposed o f using simple

Therefore, two types of push-buttons and CMOSsignals a re required : a se ries circu itry, the ci rcu it shownof pu lses to program the in Fig. 1 evolved. A blockfrequency of the svnthes iz- d iagram is shown in Fig. 1 .e r and an analog vo ltage The freq uen cy informa-proportiona l to t he desired t ion is keyed in by twe lveband. Fortun ately , acces s SPST pu sh-button switchesto these signa ls (and many which are effec tively de-ot he rs) is provided at the bounced and encoded withaccessory plug on the rea r a d iode matrix.16 73Ma gazine . November,l982

As t he switch is closed , inFig. 3, the inverter is pulledto gro und and any bo unceis damped by the effect ofthe RC network. When thesw it c h is o pe ned , a nybounce is agai n dampedsince as long as any of thedamped o r filtered boun cetransients do not exceedVccfl , the switc h is effect ive ly deboun ced a t theoutput of the inverter. Forth is c ircu it. lOOk and .01 uFprov id e d the ne cessa rytime co ns t a nt fo r th eswitches used.

The de bounced switchesfor 0 t hrough 9 a re then encoded into a BCD code. Theexcept ion is t he 0 key. Asepara te line is used for theo charac te r, rather thanrepresenting it as the abse nce of a ll other lines. Thisis p resumabl y requiredsince the PLL un it loads

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data seria lly one "d igit" a t atime with eac h keystroke.The C and E keys are contro l signa ls. The C keyclears the counters, and thebottom edge of the se lected freq uency band will bedisplayed. The E key resetsthe counte rs and must always be used prior to ente ring d igit informat io n.

In o rde r to achieve push-button control of the bandswitc hing, a digital sc anand la tch ci rcu it is used. A4001 RC oscil lator runningat about 4 kHz clocks aco unte r with decoded outputs (i n this case a 4017,

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18 73Magazine . November, 1982

Fig.5(a). Keyboard component la yout.

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easy operation . Typi ca lusage of the remote controlgoes like t hi s:

1. Change band using oneof six band select keys.

2. Ente r pa rticu la r fre q uency, e .g., 21.320,0, byusing t he 12 frequency select keys (sequence kevedin this example wou ld beE3200).

3. Tune up o r down (fastor slow) usi ng the 3 freq ue ncy scanning keys (belowband select keys).

Cha nging from one bandto another and movingfrom one end of the band tothe other can be done con-

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switches mou nt di rectly onthe printed circuit boa rd.Parts p lacement is shown inFigs. 4{a) and 5(a), Theboards mo unt in an 1MBtype MDC 752 mod ula rconsole. Ribbon cable (12conductor) is used to co nnect the remote contro l tothe accessory plug for theIC-701 .

Operation

T he la yo u t of t hekeyboa rd with the bandswitching and tuni ng keyson the right side and frequency se lect io n keys onthe left side lends itself to

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C 40 1!;20fD8016010U f

ConstructionTwo printed c irc u it

boards were des igned forthis projec t, altho ugh asma ll IC breadboa rd willwo rk ni ce ly. One is for t hekeyboard (3" X 4.5") andone is for the control circuitry (6.75" X 4.5"). Theseare shown in Figs. 4(b) and5(b). The push-button

CMOS in the 701 and run at+ 5 V de. The bandswitching voltage divi ders in t he701 are fed with regu lated+ 8 V de, so this mu st beduplicated in the remoteco ntro l unit.

since they were avai lable).Assume the counter isstopped in state #1 , and theclock is inhibited by the 10kpull-up resistor. Depressingany of the other five keyscorresponding to states 2th rough 6 pulls down pin 8of the 4001 , si nce outputs 2through 6 are low, and enab les the clock. The counte r cycl es until the highde coded output correspo nds to the depressedkey. Then the clock andco unter are again stopped.Essential ly what happens isthat the se lected o utputlin e o f t he coun te r islatched high by whicheverkey is momentarily pressed .This selected line also co ntrols o ne o f six bilatera lswi tc hes (4016s). The inputside of the bilateral switc his connected to a vo ltagedivider whose vo ltage correspo nds to a part icu larband, and the outpu ts areall com mon and fed to theband se lect input of the701 .

Another 4001 RC osc ill ator serves as the scan clockinput to the 701 in order toclock the divider in the PLlunit which tunes the synthesizer up or down in frequency, There are two inputs forthis on the 701. Clockingo ne line will increment o rdecrement the synthesizerdepending o n an up ordown signa l o n the o the rline. The RC osci llato r is runat both a fas t (SQO-Hz) andslow (1Q-Hz) rate so thatfast and slow tun ing ca n beac co mplished. The H keytu nes the 701 hig her in frequency; the l key tuneslower in frequency, and theF key increases the tuningrate to a fast scan and mustbe depressed with an H o r lkey for fast tuning,

Power for the remo tecont rol is obtain ed from the1S-V-dc pin on the 701 accessory plug and is then regulated down to +8 V and+ S V for the d iffe rent portions of the circuit. The updown counters (fast andslow) and the frequencypreset logic are all standard

73 Magazine • November,l982 19

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sidera blv faster tha n bymanual tu ning, and with not rans m i t t er t u n ing, thecapabili ty for instant QSYbecomes more real iza b le.

There are severa l intere st ing ope rating trickswhi ch c a n a lso he accomp li shed with t heremote con trol.

1. The RIT, once turnedon, will no t he defeatedwh e n t un ing w it h t heremote cont rol , as it willwith the manual tuni ng contro l.

2. Pressing " E" and " 1" simu ltaneo usly and releasingthe " E" first wil l add 1 MHzto the d ispl ayed frequen cy;however, the display willonly cha nge on 20 metersand the display will ind icate 15.xxx .x.

The fo ll owing is a list ofthe expanded coverage tha tis av a ila ble:lbOlll - 1,000,0 to 2,999 ,9;BOm - j 000 0 to 4,9999,MHz wil l no t di splay "4";40m - 7.000.U to 7.999 .9;

20m-14 000,0 to 15.999.9.15m -21 .000.0 to 22.999.9,MH z wil l not disp lay " 22";10m -no ex pa nded coverage.

T he re a re o bvio us lyo the r features that could hebuilt into the remote control. Memory wou ld be a"nice-to-have" add it ion andreally not that ha rd to doa lt ho ugh the seque ntia l(seri al) data input require-ment does compli cateth ings somewhat. I don'tmi ss add itiona l memo ry,ove r the two in the 701, hutthen ag ain I d idn't miss theremote cont ro l unt il J hegao u.-.i ng it. l he ability toInstantly move to differentfrequencie s aro und theb a nd is the most use-f u lone for me and It ha v becom e an operating c onvenn-n ce ' 1 wou ldn 't OPWithout.

Keys fo r the keyboarda nd c irc u it boa rd s a reava ila ble . Pl e ase enclosean SASE fo r de tail s.•

,

SA.,11."'1'1 I'lI.EV'S'ON RECE'VER

20 73 Magarine . November, 1982

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Automatic Beam AimerHere's the scoop on adding set-and-forget convenience to your

rotator control. Works with most common control boxes.

•

Cuy S lau~hl er K9AZC753 \\'. E/iuberh Dril f.>Cro wn Po int IN 46307

I have a sm art knob in myshack. It looks like any

other dumb old pointerknob st icking out of a blackbox. hut it's really q urteclever. Turn it to a givenbeam heading, and it makesthe Cus hc ra ft tribanderatop the tower outside myhouse rotate to that samedirect ion and stop there. a llby itself.

I built it s prototype o rigina lly for my sight le ssfriend, W9PBS. who unti lthen had a problem knowing wh ich w ay his four-elem en t m ono ba nd e r w asaimed . The vol tm ete r needle on his Ham IV rotatorcontrol that usually readsout the direct ion his beamis po int ing is worthless tohim, of course. It was wh ilemulling over the prob lemof converting that analo gneedle's silent message intosomething more useful thatI came up with the idea fo rthe smart knob. And I likedit so well whil e debugging itand burn ing it in o n my ownoperating tab le that I had tobui ld one for myself .

That's because my ownD(45 rotator contro l,ident ical with the Ha mIV 's and the cont rol for theCDE's big antenna whirler,the Tailtwiste r. require sholding down both a brakerelease a nd a directionbutton whi le the beam isswinging from o ne compa ss point to anot her. Thiscan take as much as half aminute for a 180-degree d irec t ion change. The smartknob. o n the ot her ha nd,require s only a qu ick twirlto the desired beam heading and it does th e rest itse lf, br inging the antennaa round to the ta rget whi leI twea k my tra nsceive r tun109 to pea k tha t rare callup o ut o f the mud a nd pre pare to ente r it in my log.

If yo u have a ( DE rotator, I think you'd enjoy asma rt knob, too . Mine'sbeen in u se fo r m an ymonths now without everrebelli ng at its ta sk. So hasthe one in daily use byW9 PB S, w ho a ctuallyswitches it between twosepa ra te Ham IVs, driving15- and 20-meter monobanders mounted o n separate towers.

The knob itself is fastened to the shaft o fa 25k pot exte nd ing froma bl ack box which, alongwith all the ot he r pa rts andpieces inside exce pt thosescrounged from my jun kcollection. was bough t atmy nei gh borhood RadioShack, fo r a total o f lesst han $50. The heart of thegadgetry inside t he box isthat pot and a 12-vo lt-dcpower supply capable ofproviding 150 mA or so (seeFig 1). The supply feeds twosect ions of an lM339 quadcomparator c h ip, t hree2N 3904 t ran sistor s, a ndthree 12-volt relays withDPDT contacts rated a tthree Am ps . (See RadioShack numbers in the PartsList.I But before we ge t intothe ir fun ctions, let's dis cussthe CDE rotator contro lsystem.

It is a conventiona l lowvoltage ac capac itor-startmotor whose direct ion ofrotation depe nd s on wh ichhalf of its wind ing pa ir is energized. Though the lightduty C0 -45. the mediumduty Ham IV, and theheavy-duty Tailtwister ro ta tors have different brak ingsystems and varying num-

bers of ba ll beari ngs in the irinna rds , they are simila re lectrical ly and the ir control box es are identical.Each conta ins the motorfeed transformer, the sta rtcapac ito r. th ree push-andhold button switches forbrake release and d irectiona l cont rol, and the d irecti on-i ndi cating c irc uit ry,That ci rcu itry consists of apower supply which provides 13 volt s de. a vol tmeter to read it, and a calibratio n pot.

Inside the motor housingthe re is a va riable resistorshu nted ac ross the float ingground, 13-volt supply (andco nnected to it by ro tor cable terminal posts 3 and 4on the back panel of thecont ro l box). The mo vablea rm of tha t remote resistor,mechanical ly linked to themotor rotor, is chassis grou nd , cabled to terminalpost 1 on the control unit .

The re sistor is tied intothe di re ctio n- indi catingvoltmeter circu it so that themete r reads full scale-13volts- when the ro tor isfully clockwise, zero voltsa t full counte rclockwise,and 6 lh volts a t the ha lfway


..,ce,

_2.cov" TEII ClOC _ .'SE "E L....Kl.911A.E IIELAT., - ~ . liS ~ 76- 206

' If you've got a rotator, you must have some cable somewhere, probably hanging in the garage. My Rad io Shackdoesn't stock it. The other parts will add up to around $45, ilyou buy them all new. Happy knobbing,

1cabinet (270-453)1 transformer, 12 V, 300 mA (273·1385)3 relays, 12 V, DPDT (276-206)1on-ott switch (275-612)1 package (2) zener diodes, 6 V (276-571)1 25k pot, linear taper (271-1715)2 l OOk minipots (271-220)1 package (15) 2N3904 transistors (276·1603)1 quad comparator lM339 (276·1712)1 te -pm dip socket (276-1999)2 l ,OOO-"F erect rorstrcs (272·957)1 47-"F electrolytic (272-1027)1 22-" F electrolytic (272·1026)1 3·Amp rect ifier diode (275-1143)1 PCboard ,4Y2 "x6 "(276-1394)1 package push-in terminals (270-1394)1 package (SO) diodes (276-1620)3 10k, V. ·Watt fixed resistors2 tOOk, 'I.·Watt fixed resistors2 t meg, w -w att fixed resistors4 1k, w-wett fixed resistors1 length, (two, three feet) ercnt-cooouctor cable '1 knob, pointer, junk-box type

Parts list

• •1. Ro tator control scnemstic.

t ion approaches full co un- you can tell the smart knobterclockw ise so u th, and be- to go full so ut h clockw isecau se even a sm art kn ob re- where It has lots o f vo ltagequires a smal l frac t io n of a to sense. And it will.vo lt to sense, counterc lock- There are no part icularwi se ro ta tion w i ll stop co nst ruc t io n hints to passabout 5 degrees from due along. Every th ing is dc and,so ut h. But that's no big therefore, lead lengths anddeal. M o st beams have dress are not a problem. I60-degree lobes; you still used perfbo ard and wiredcan nudge the antenna the point -to-po int because I'mrest o f the w ay with the not into pr inted -e ircuit fabm anu al pu sh-but tons. or ricat ion. On one of the

73 Magaz ine · November,l982 23

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gle betw een t he sm art kno band the beam rotor.

The rel ay co ntac ts paral l el the pu sh -butt o nsw itches of the roto r cont ro l box, thus energ iz ingthe brake and rotor motor,w hich sw ings the antennato the d irec t ion ca l led forby the sm art knob; then t hecontac ts open to ho ld itthere . They are so interconnected that even a com ponent failure o r human errorcan not trigger sim u ltaneous c lockw ise and cou nterclock w ise ro tation. Andthere is a time-de lay circ u itin the brake-release rel ay 'sswitch ing-t ransisto r c irc u it ry ensuring that the rotor and t he heavy load i t carries- co asts to a stop before the brake is reapp lied.thus avert ing the tow ertw i st i n g , roto r -ru in ingtorq ue tha t the inerti a o f asudd enly-b raked antennacan exert.

The com ponent va luesshow n provide a va ria b lebraking del ay of about tw oto fi ve second s, adequatefor my t ribander and theheavier four-element rno nobanders used by W9PBS.

There is o ne smalllim itenon Because the vo ltagesignall ing the co unterc lo ckw ise co m para to r to tu rn onits sw itch ing t ransistor fall sto zero w hen antenna rota -

point. The voltmeter face isca li b ra te d acc o rd in g l y,north at ha l f scale, sou th atf u JI c lo c kw ise a nd fu llcounterclo ckw ise, w ith theo ther po ints o f the com passin betw een.

A nd t hat ' s where thesm art kn ob comes in , If weco nnec t the outsid e termi nals o f its 25k pot acrossbind ing posts 3 and 7 o n therear apron of the cont rolbox (shunt ing the rotor-feedwi res already there), the potw ill be in parallel wi th t he'l Lvol t . d irection-ind icatorsupply, and the pot' s centerterm inal will show a vo l t age to ground proportio nalto the d i f ference in rela tiveset t ings of the pot and therotor-mo unted resisto r.

W ith the roto r turneddue north so that 6 'h vo ltsappears on t he vol tm ete r,turn ing the sm art knob'spot to ha l f rotation -mapnorth as ind ic ated by thepointer knob, straight up w ill bring to zero the vo ltage between it s cen ter te rm inal and chassis ground .Now rotate the po t cl ock wise, and that zero voltagewill climb toward plus 6 1h ,depending upon the degreeo f rota t ion. Turn it co unterclockwi ..e. and the vo ltage\vi l l f all back to zero at themidsetting, then begin anegat ive cl imb to - 6 %when it's at ful l co unterclo ckw ise.

Tha t's the secret o f thesmart knob's intell igence.A ll w e need to do now isharness thi s intell igence tocont ro l the rotor motor andbraking circu it so that ourbeam points wherever thekno b tell s it to .

Fig.l shows how the center term inal of t he 25k linear-tape r pot feeds two sect ions of t he co m parato rchi p so t hat o ne senses posit ive voltages. the other negative. Because each turnso n a sw itching transistorwho se co l lec to r cu rr en tfl ows through rel ay co ils,one or the other rel ay ispulled in whenever there isa difference in rotation an-

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sm art knobs that I buil t . Iused an eight-term inal barrier st rip to w ire It to theCOl:. contro l box, and o nothers I chassis-mountedsix-co ntac t female socketsso they cou ld be unpluggedfrom the rotor co nt rol boxfor testi ng and f idd ling

How ever you wi re you rsto the ( DE control . the re isa sm all bit of surgery required You need to shunt atwo-eonductor cable ac rossthe brake-sw itch contact sins ide t he COl:. co nt ro l boxand bring it out to the smartknob box, There is p lenty ofroom to work inside the rotor co nt rol. and the plasticcabinet ca n be flexedenough to pass the cablebetween it and the chassis ifvou don't want to drill it fora connector socket.

If you use a plug andsocket for thi s. be SUH' thebrake contacts <He connec ted to the female hal f o f theco nnec t o r, because thebrake wires are hot with 120v ec.

With the sm art knobbuilt and connected to theCOE control box. disco nm-e t the bra ke-energ izingcable so that the antennawon't be sw inging back andforth as you adjust the pick up-dropout points of theswi tc h ing transistors bytweak ing the 100k minipo tteedmg pin 4 of the comparator chip , Once yo uhave that minipot properlyset so that the device neither hun ts fo r a null norfa i ls to respo nd to a :H o-5degree rotation of t he smartknob. you can loosen thepo inter-knob set screw o nthe 25k po t shaf t to l ine itup at due nort h when theantenna IS point ing duenorth,

Having thus com pe nsat ed for any d iscrepan cy between zero voltage at thepot's wiping contact and itsprecise half-revivtan ce set ting. you wi ll f ind calibration is remarkably accurateat al l p oint s o f thecom pa ss _.

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73 Magazine • Novembe' .1 982 25

Jim We,r WB6BHIRadio Synems Technology10985 Crass Valley .AvenueCrass Va lley C.A 95945

Life-Support System for HTsAt home or in the car, this do-it-yourself charger and accessory

box could be the best friend your handie-talkie ever had.\

•

For the f irst couple ofweeks after you buy

your 2-meter handie-ta lkie" brick" (Tempo, learn, Yaesu, etc.I it is so rt of fun toplug and unplug the unregulated charger so that themead battery pack stays atfu ll c harge. A fte r that ,though, the newness wea rsoff and it is just a pain in thelower backside to try toguess at how long youough t to leave the juice onbefore you boil the cel lsdry. Not only that, but you

are never reall y sure whether you have given the battery pack full charge orwhether you are consistently undercharging the nicadpa ck, a notorious cause ofni cad deterioration .

In addi t ion, i t wou ld besort of nice to be able tooperate mobile with yourbrick and use the same mob ile speaker and m icrophone that you use for al lyour other mobile equipment plus the mobile's bat-

terv-gene tator charg ing system. The brick box descr ibed here will solve theseproblems and perform thefoll owing functions :

1) Regulates the voltageand li mi ts the current f romthe factory-supp lied wallcharger so that the meadbatteries in the bri ck maybe left on charge for as longas you l ike without overcharging.

2) A l lows the car (or boat, o r

snow mo b ile, or aircraf t)battery-charging sys temalso to charge the brick batteries with a regu lated,current-li mi ted ci rcuit.

3) Permits you to plug in amobile m ic rophone andprovide s an am p l i f i e rmatching circuit betweenmicrophone and brick thatis ad justable for exac tly theright am ount of deviation.

4) Al lows the speaker ampli fier in the brick to drive an

•

The completed brick box .26 73 Magazine· November, 1982

Inside view of the brick box showing unique "cobweb" construction.

"to

t""' ''..~"'TQ ~ T.

• November,1982 27

because these high-powerwall packs have a prettyraw, recti f ied ac waveform .

The trick to use to keepthe maximum available current below 200 rnA is to usea 78L05 for the regulatorc a l l ed out above. The78X05 is actually a wholefamil y of regulators whereX defines the normal maximum current available. If X= l (78l05j, normal currentmaximum is 100 rnA; if X =M (78M OS), normal currentmaximum is 500 rnA; and ifX = nothing (7805), the cu rrent available is 1 Amp.

Now, the internal current-limiting c irc uit in theselCs sets the current-lim itpo int to about 150% of themaximum normal current,so if you use a 78L05 asyour voltage regulator IC,the maximum current thatyour nicad pack can draw isapproximately 150 rnA, wellwithin the maximum chargecapacity of your brick'snicad pack.

Since I had planned touse the brick box in aeronautica l mobile use in addit ion to use with a high-power wa l l-pack charger, noton ly d id I use the 78105 asmy regulator, but I al so supplied both a 3.5-mm ja ck onthe br ick box to plug-in the

'-- oj "',.

of the wall charger. I found10Cl0 ,..F to be the optimumva lue; do not go bel ow 0.1,..F or the regulato r wi l lbecome unstable.

Fig. 1. The basic brick-box charger-regulator.

High-Power Regulator

In t he event you can getyour hands on a wa ll powerpack w ith more output orfor those w ho are going touse the almost unlim itedcurrent available from anautomotive (or boat, or aircraft, etc .) supply to recharge the brick batteries.some method o f cu rrentlim it ing must be em ployedto ensurethat the nicad battery pack does not overheatdue to excess charging current. Incidentally, for thoseof you looking for a very inexpen sive high-current1 2-v o l t wal l-pack-stylecha rger, look in the autosupply sto res or the automotive department of thelarger discount houses for a" c o l d -w e a t h e r batterym a in t en an c e c ha rge r. "These little rascals look justlike a low-power calculatorwall pack, w ith one end terminated in a cigar lighterplug. bu t the f act of thematter is that they put out12 vo lts at a whopping 300rnA. Don't forget the 1000,..F fil ter capacitor, t hough.

Fig. 2. Adding cnerge-indicetor circuitry.

73 Magazine

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"12-V. 5O-mA" variety. noexterna l l im iti ng will benecessary. The wall chargeritself provides the necessary current protection byits design. However, a fullydischarged 45O-mAh battery will require over 9hours to fully recharge. soyou may wish to considerthe alternative fast-chargec irc ui t described a litt lelater.

For those using a currentl imited wal l-pack c harger.the circuit shown in Fig . 1w ill regulate the finalt ri ckle charge vo ltage to1.37 volts per ce ll . o r an output of 11 .6 volts into theTempo 51 CHG jack. (1 .37X 8 cells + 0.7 volts, tocompensate for one silicondiode inside the 51 in serieswith the charger line.) Thebasic ci rcuit uses a 7805 (o r78M05 or 78l05) regulator,with a 1k variable resistorused to set the exact outputvol tage. To set the outputvol tage accu rately, connect a 47D-Ohm resistoracross the 11.6-vo lt regu lated output and adjust Rl(the 1k var iable) for exactly11.6 volts on an accuratevoltmete r acr o ss the47D-O hm resistor. The va lueof Cl (1000 ,..F) is not critical at all , providing thatthere is less than 150 mVripple on the output w iththe 47o-0 hm resistor atta ched. Up to a point, adding more capac ita nce tothi s point inc reases thecharge rate (m illiamperes)

externa l mobile speaker(with an option to install aspeaker-driver-ampl ifier forhigher power output) or aset of high- or low-impedance headphones.

5) Permits you to plug in toan already-exist ing mobileinsta llation such as a pri vate airc raft audio panel ora VHF-FM boat system anduse the m icrophone/speaker/head phone set upin the mobile craft .

6) A ll these goodies costless than $10 (plus an extra$5 f or the high-powerspeaker amp).

Here are t he ground ru lesfor using th is art icle: Mostof the parts are availablefrom any well-stocked hamstore or " hobby-shop" electronics place. You may freely substi tu te for any of theparts. None of the parts values is reall y critical c- avariation of + 20% shouldnever really be noticed .Al so. th is art icle w as written using the Tempo 51 .and interfacing with standard commercial FM microphones and aircraft microphone-headsets (carbon o rampl ified dynam ic). Otherrigs and ot her microphonesmay require modifi cationsof the m ike amplifier c ircuitas show n later.

Regulator

The power supply regu lator must perform two functions. First, on a deeply-d ischarged nicad battery pack,the regulato r must limit th echarging current below approximately 200 mA. limiting the charging current inthis manner prevents thecells from outgassing anddry ing ou t the electrolyte.Second, the cha rger mustlimit the end-charge voltage to the cel ls to approx imately 1.37 vo lts for eachcell , at wh ich point the cellsmay be allowed to tricklecharge at this voltage indefin itely.

The current limiting maybe done by either of twomethods. First . if the wa llcharger it self is one of the

-_.~. - - - - - - -

••

Microphone Amplifi er

The seco nd ref inement isa matching ci rc uit shown inFig. 3 wh ich will take theoutput of a sta nda rd mobile mic rophone (ca rbon oramplified dvnamic l andmassage it to fit t he inputreq uirements of the brick .(Note: for those of you using stra ight low-z o r high-zdyna mic , ceram ic , or crysta l microphones, see Fig 4.The va rious va lues for Fig. 4a re shown in Table 1 .) Sincethe requ iremen ts of thebrick a re a mic rophonevoltage o f so me 200 millivolts peak-to-peak and theoutput o f the ca rbo n/dynam ic microphone biasedwith 10 mA (by R7{RB) isabo ut 500 mil li volts p-p. theop a mp c ircuit shown willprovide an outpu t so mewha t in excess of requirements a nd can be ad justedto the proper de viationleve l with R11 The rationa le here was no t so muc hthat we had to have an opamp to drop a S()()..mV levelto 200 mV, wh ich co uldwell have been done with asimp le resist ive network ,but we had one leftover opa mp from the Ie used in thecha rge-light c ircu it, a nd theo p amp is necessary for thealte r nate m ike ci rcu it sshown in Fig. 4.

O nc e aga in, since th isbrick box was intended fo ruse as bot h a base-s ta t ionpatch bo x and a mo bile interf ace unit, a mic rophonejack was install ed o n thebri ck-box chassis, plus apair of wires to the molexconnector fo r a ttac hmentto the ai rc raft mic rophonea nd PTT switc h. A switc hwas included o n t he brickbox so that e ither internalm icrophone (t he brick-boxjack) o r exte rna l m icrophone (through the molexplug to the mobile mikesetup) cou ld be se lec ted.This was done so t ha t the

a re charging a nd when it isdark , the meads a re e it he rdi sco nn ec ted or fu ll ycharged.

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be subst itu ted . The soc a lle d No rto n (LM3900/MC3401) op amps may beused , but you are on yourown fo r the c ircu it modifica tions which are necessa ry.

The 3.3-0 hm resistor (R 3)introduc es a neg lig ible voltage loss to the cha rging c ircuit. yet drops more thanenough m ill ivolts fo r the opamp to work with . The presumpt ion is that when thecha rge cu rre nt d rops below20 mA. the mead pack is ful ly cha rged . At this c urre nt,the 3.3-0 hm resisto r dropsa bo ut 70 mv. The op ampse nses th is vo ltage dro pand when the voltage dropsbelow 70 mY, the c ha rgeligh t extinguis hes. R6 (1Meg) se ts the c urre nt leve la t wh ich the cha rge lighttu rns on and off; if you wishfo r the light to turn on andoff a t a not her c urre nt leve l,a tt ach a resist ive load ofyour chose n va lue fromoutpu t to ground a nd se lec tR6 until the light just fl icke rs. Remember. now, whenth is lamp is li t, the nicads

One of the lamps wi ll tell uswhen power is bei ng suppl ied into the c ha rge r a ndthe second lamp wi ll tell uswhen the end-of-charge cycle of the nicad pack hasoccurred . The first lamp iseasy: a n LE D and a resistor(R2) will tell us if ou r wallpack o r au to system isplugged in . The second(e nd -of-c ha rge) la mp require s a litt le mo re c irc uit ry.

The hea rt of the chargelam p is a high-gain o p amp(LM324) used as a co mparator . Th is ci rc ui t isshown in Fig. 2 The type ofop am p is no t cri tical,e ither. The common 741 o ra ny other true o p amp may

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Table 1. Values for various microphone types,

28 73 Maga zme • November. 1982

Fig, 3. The deluxe mobile-base brick-box schematic.

wall pack charger a nd acab le connectio n to a m olex!l-type connec to r for at tachme nt to the ai rcraftelec t rica l system. As wesha l l see, using a 6-p in molex connec to r allows me touse the mobile m icropho ne a nd s pe a ke rlphones, as well as the a ircraft battery-charging system .

•

,, '

Charge Indicators

So fa r. we have a nicadba ttery pack cha rging system tha t will acce pt a lowor high-power wall pack ora ba ttery-genera tor automotive-ty pe syste m. Thefirst refinement to makewil l be a pai r of LED lamps.

Fig. 4. Parts changes for various microphone t ypes. SeeTable 1 for values.

TO " OB1LE ~I"STALLAT'O N •

Fig. 5. Adding a high-power speaker amplif ier.

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hams between Grass Valley. Cal iforni a. and Oshko sh, W iscons in. w ho gaveus hints and suggest ions fo rimprovem ent during our recent aeronautica l mobilecross-country.•

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feet and call CQ on .52sim p lex !) M y t hank s toWD6EWI for his commentsand criticism and N6AUBfo r his patient on-the-airt e st in g . My ad d i tio n a lt hank s to the hund reds o f

speaker amp o f some sortwas in o rder. Since t he mostcommon high-power chip ingenera l use and ava ilabi li tytoday is the lM383, I choseto use this f ine device. A lt hough the des ign is ve ryst raight fo rw ard, I recommend that you heat - sinkthis dev ice to the biggestp iece of meta l you can fi nd.In fac t. if I were going to incl ude th is ci rcu it in my ow nbr ick bo x, I wou ld undoubtedly use the metal chassiscover for the heat sink. Thetried and proven ci rcui t ofthe speaker amp is show n inFig. 5.

Concl usion

The brick box has been inope ration for almo st a yea rnow w it h no serious problems. M y 51 's b atterieshave always given me thee xp ec ted se rv i c e w hencharged by the box and m o-bile service has been beyond any hopes I ever had.(You get up to ten thousand

p i l ot o f t h e a i rc ra ft(W B6HHI) or the back-seatpassenger (W D6EWI) couldaccess the 2-meter rig separately and independent ly ,

The remain der of the elementary bri ck box is Quitesimp le. The speaker outpu tof the transceiver is run toboth the headphone jack inthe brick box and a wi re tothe molex p lug for externa lmobile speaker.

Speaker Amplifier

Al though thi s concl udesthe const ruct ion of the elementary brick box, severalcomments from my fellowham s led to the fi rst majo rmod if ication of the box.Since my ma jo r app licationof the box was for airborneuse and I was feed ing thepuny 1/2-Watt speaker signal out of the brick into a10-W att a i rb o rne c abi nspeaker amp, I never no-ticed how poor the speakeraudio really was. A fewtests conv inced me that a

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30 73 Maga zme . November, 1982

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PRICES AND SPECIFICATIONS SUBJ ECT TOCHANGE WITHOUT NOTICE OR OBLIG ATION.

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73 Magazine • November.f saz 31

George L. Thurston 11/ W4MLE2116 Gibbs DriveTallahassee FL 32303

Whatl! AnotherAudio Filter Project]

Yup. And even the most modern receivers benefit from thisQRM-crusher.

I

..>'-'- C~I P P( A . " ' ~ TE P CQOI ....USOOI P- ...P $P"P/""OOI£S

Fig. 1. Audio processor block diagram.32 73Magatine . November, l982

I got my hands on one ofthose toy tran sceivers a

few months ago - the kindwith a flea-power trans mitter and a direct-conversionreceiver - and for a while, Ihad a ball with it.

But slowly, some drawbacks began to manifestthemselves-not so muchin the rig, bu t inside myhead, where ringing no isesrefused to go away. The receiver is q uite sensitive andhas a tremendous dynamicrange but it has no age(automatic gai n cont rol), sowhe n you ' re tu ning fo rweak OX signa ls and comeac ross a Texas rock crusher.. .Well , I generally don'tche rish co rona flick er ingbetween my ears ,

It slowly dawned on methat even my ma in station

receiver, though it has agood age system for CW,exhib its some other ra thernasty habits wh ich it shareswith the little playthi ng rece iver. And eventually, Ibegan to think about doi ngsomething about it.

Unfortu nately, most modern ham-band receiverseven the very good onesdo very little after extracting aud io from the produ ctdetector, except to ampl ifyit and cram it into a speakeror a headpho ne output.Many thin gs can be done toaud io to make communications a lot better, especiallyon CWo

The audio unit to be descr ibed is my second majoreffo rt in that d irect ion. Theprevious unit, built about1960, used vacuum tubesand weig hed e nough to

keep my ho use and shackfrom blowing away in Hurricane Donna. That unit, desc ri bed in a long art icle inQST,l offered peak clipping, audio selectivity, andvolume compressio n, noneof which was ava ilable int he rece ivers of that day or in most 1981 models.There is one big difference.Modern rece ivers usua lly(but not always) have agcsystems wh ich work wellwith SSB and CWo

My new aud io processorwould have to be all so lidstate, like the rest of myequipment, and it wouldhave to offer the same features as the origina l. withsuitable improvements.

If yo u work contests o rOX pileups on CW, youknow that a 400-Hz passband sounds like you' re listening to all outdoors, es pecia lly if yo u have experienced the good selectivityof t he 1DO- Hz-a nd-undervariety.

But se lec tivity has itstrade-offs. Any so rt of noiseimpulse is stre tched . Keyclicks, whic h so und like asmall-arms fight in someMiddle Eastern desert, become a rolling artillery barrage when they' re stretchedth rough a sharp filter. 50,even with a good receiverage. you still need to dosomething abou t the no isepulses befo re you int roduce se lect ivity.

And, fo r those rece iverswithout age o r o nly a poorage . a udi o co m pre ss io nwo rks wonders . Beforegood agc was developedfo r SSB and CW, a CW operator had to tune hi s receiverwith one hand on the dia land the other on the rf gaincontrol . Even with that kindof receiver (or with a modern direc t-co nve rsio n jobwith no age]. one-handedtuning becomes possiblewhen yo u use aud io compression.

Til R(tE 'V(R~

A ~ OVT~VT~

Fig. 2. Clipper-selectivi ty section of processor. Q l and Q2 are PNP audio transistors such asthe 2N3906. L1 and L2 are 88-mH telephone toro ids. See text for C1 and C2.

Fig. 3. Audio compression and power. 0.3 is a 2N3819 FET or any similar audio FET. U3 is aTL081 FET op amp. U4 is an EC5700. ULN2277, or FE 1C27. D1 ·D7 are 1N91 4s or similar.

73 MagaZine R November, 1982 33

.'H TO COMPRESSOR

ca n cha nge the resonantfrequency simply by cha nging the values of the pa rallel capacitors. To change abridged-T involves three capacitors in each pole o f thefilter . (See Fig . 2.)

The output o f the clipperis app lied across one 88-mHtoroid tuned to 700 Hz withcapacitors totaling 0.57 IJF.Anothe r block ing capaci torisolates the toroid from thede o n the base of Q1. Thetransistor ampl if ier restoresthe considerable insert ionloss caused by the clipperand the toroid filter . Anyhandy transi stor ca n be

termed iate point which theoperator finds to be comfortable. The sett ing will beaffected, o f co urse, by theaudio ga in control on thereceiver .

SelectivityThe output of the clipper

is fed to the selective circuit t hrough a capacitorwhich blocks dc. Any of avariety of se lect ive circu itscould be used here, including t he popular bridged-Tactive audio fi lters using Ieop amps . I chose to use pa rallel-resonant 88-mH te lephone tcroids because I

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the clipper comes out looking much like a sq uarewave. Noise pulses, ofcourse. also are clipped.How deeply the signal isclipped depends o n howmu ch bia s voltage is a pplied to the d iodes by the10k pot. The vo ltage can bemade so high that no clipping occurs, or so low t hatno signa l gets th rough at all .The cl ipper can also be defeated by clos ing SW2which shu nts the audioaround the diodes co mpletely.

In use, the clippingthreshold is set at some in-

So, I decided my fancysolid-state processor mustbeg in with a peak cl ipper.followed by a good stage ofse lec t ivit y. followed bycom pre ssi o n. and then{fina lly} by enough powerto d rive a loudspeaker andphones. It must be connected to the rece iver onlyby a patch cord from theheadphone or speaker output to the processor input,so that no modificationsneed be made to the receiver (see Fig. 1).

Clipping

Cli pp ing and compression a re terms which areoften misunderstood. Clipping, for our purposes. isthe process of whacki ng offany aud io signa l whic h exceeds some preset amplitude . The waveform isgrossly d istorted and lots ofharmonics are generated inthe process.

The cl ipping circuit chosen for thi s application isthe familiar full-wave, series peak cl ipper (Fi g. 2l- Itworks like th is:

Audio from the receiveris fed through a capacitorto a pai r of sma ll silicondiodes (1N914s o r simil ar) inse ries, anodes co nnectedtogether. A positive vo ltageis appl ied to the anodes, sothat current flows throughboth diodes to groundthro ugh load resistors.

As long as those d iodescond uc t. they look likepieces of wire to the audiosignal co ming in from therece ive r. But the moment apositive aud io peak voltagebecomes greater tha n thefo rwa rd bias, the diodeceases to conduct, and thesignal ca n't get any biggerin that direction. The negative half cycle, though, goesthrough because it only forward biases the diode evenmore.

But the other half cyclethen co llides with the second d iode. with reversedpolarity , and the othe raudio peak is clipped off . Agood si ne wave app lied to

....

Fig. 4. Power supply suitable for the audio processor.

Construction

Construction is straightfo rward and non-critical . Ibuilt the power supp ly in toa corner of a smal l aluminum cabinet box. using asma ll piece of perfboard tomount the components .The board was mounted tothe chassis with the smallmetal mounting lugs obta ined by dri lling them offo ld-s ty le ti e-point st rips .This type of mo unt ing is extremely conven ient becauseit pe rm its sta nding theboa rds on edge and provides fo r easy removal forservice or modif ication ,

more at 35 volts or more.The regulator chip willdeliver one Amp. maximum,regula ted , and that's probably three times the actua ldema nd of the system. Theo utput amplifier chip probably can be run directl yfrom the unregu la ted output of the power supp ly,provided this does not in-troduce noticeable hum inthe output.

Eac h board was stood onedge and bo lted to thechass is with brac kets . Butthese should not be usedfor circu it grounds . Ground ing each board di rect ly tothe chassis will probablyre s u lt in ground loopswhich produce hum, noise.

The toroids weremounted on a piece of perfboard with dabs of five-minute epoxy, leads anc horedto tie-po ints, and then theperfboa rd was bolted to theedge of anothe r type ofuniversal c ircu it board onwhich each cluster of fourholes is connected togetherby a fo il pad. This is usefulfor mounting the trans istorsand other components bytheir leads .

The IC circuits were builton unive rsal c ircu it boards. 'One board was sawed inhalf, and the compressorand clipper buil t on o nehalf, the output am plifiero n t he other.

With no signa l applied tothe input of U3. no ou tput isge nerated, hence no voltage from t he voltage doubler. The FET is biased to"p inch off" by t he voltageac ross R2 , wh ich makes thegate negative with respectto t he source.

Whe n a n aud io voltageappears at the input of U3,a positive dc voltage appea rs across the voltage divider and this is appl ied tothe ga te of t he FE T via 0 7,op posi ng the negative biasand all owing the FET to begin to turn on. The moreaud io ou t from U3, themore positive bias. and themore the FE T turns on, making its resist ance lower andlower. The effect is thesame as moving the input toU3 further t ow ard t heground end of a vol umecontrol; it applies less aud iovoltage to the input, thuscutt ing back on the ou tput.The result is excellent volume compression in whic hthe output remains almostconstant despite greatchanges in input level.

So me of the o utputaud io is picked off by thevolume control a nd fed tothe audio amplifier IC, U4.

Audio Amplifier

A cons iderable variety ofaudio amplifier ICs is available. I used a UlN2277 forU4, which provides twoWatts per channel, and I only used one channe l. Anl M386 could be used a ndwill provide about half aWa tt of audio to drive asma ll speaker beyo nd endurable volume. It costsabout o ne dollar at hamsupply houses. '

Power Supply

A regul ated power supply (See Fig. 4) is used because the regulator IC provides exce llent rippl e fil tering, not because anythingneeds a regulated voltage.The rectifier is a small.cheap bridge o r it can bemade up from disc retediodes rated at one Amp or

"' l &V. I••'l ....E ~ T

T.U~'O" lI£"

e c.., I

used. and the o nes I used Compressionwere junk box PN P silicons Compression is a somewhich were probably refu- what misunderstood term.gees from a Radio Shack Here it is used to mean au-red-tag sa le. If you use tom at ic contro l o f theNPNs or germa niums, be aud io gain so that the amsure to make the neces- plifier output rem ains v ir-sary ci rcuit changes. includ- tua lly consta nt, despi teing polarity and bias . AI- large cha nges in the inputmost any inexpensive audio level. The process does nottransistor in a suitable am- distort the waveform of theplifier circuit will do the signal. (See Fig. 3.)

job. In the ci rcuit I chose,J theThe output of Q1, taken compression amplifie r (U 3)

from t he collector, is cou- is a Tl081 FET op amp, inex-pled to the second toroid, pensive and readily avail-tun ed to the same frequen- able . The output of the fil -cv as the first , and agai n the ter is fed to the non- invert-insertion loss is restored by ing input of op amp U3, andQ2 . Actually, it is some- its output is fed to the inputwhat more than restored , of an audio power amplifierand the output is ample to hi U4c tp, .drive the next stage. The output of U3 is a lso

In operation, you can fed to a voltage doublere lect to use both toroids, for med by D6 and 07. Thisfo r maximum se lect ivity, genera tes a po sitive dc volt-only one toroid fo r inter- age whi ch is proportional tomed iate sha rpness. or nei- the au dio ou tput voltage ofther one, leaving you with U3, and this dc voltage ison ly the selectivity of the fed to the gate of FET Q3.receiver itse lf. Switching is The FET acts simply as adone by means of diodes, variable resistor. Note thatso that signal leads can be audio coming out of the fil-kept on the ci rcuit boa rd, ter stage is fed to the top ofand not run to the front a voltage divider composedpanel. With SW3 in posi tion of R1 and R2. The input of2 (Off), nei ther toroid is in the op amp is taken fromt he c ircu it beca use its the m idway poi nt on thisground retu rn ci rc u it is d ivider. The bottom ha lf ofopen. the divider. R2. is pa ra lle led

In position 1. positive by the source-d rain ci rcuitvoltage is appl ied to 03, of the FET.making it conduct and be- The ground return of thecome virtually a short ci r- voltage divider is the centercuit to grou nd, thus com- of another voltage divider.pleting t he to roid ci rcu it. In fo rmed by R4 a nd R7.pos ition 3. voltage is ap- across t he power supplyp lied to OS, thus ground ing vo ltage . This tap is a lso thethe ret urn fo r l 2. The same ground return for the 470-voltage turns o n 0 4 whic h, O hm resistor in the invert-in turn, turns on 03 so that ing input lead . This makes itboth toroids a re now in the possible to use only a singlecircuit, for maximum selec- power supply for U3. rathertivitv than two.34 73 Magazine . November, 1982

,..

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73Magaz ine " November,1982 35

For more details, please ritefor our latest catalog or visityour favorite dealer.

Prtcea and S pec i f icatio n s subject 10c hange without notice or o b lig atlo n .

ADVANCED ELECTRONICAPPLICATIONS, INC.P.O. Box C-2160,Lynnwood, WA 96036(206) 775-7373Telex: 152571 AEA INTL-,

AEABring s ,ou the.........=-=-=B:.;re.:.;;a k:.;t hrough l

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Fi g. 5). O ne e nd of the pot isconnec ted to +12 V dc a ndthe o the r e nd is grounded.W hen the wiper is grounded. the FET turns fully on,red uci ng the op-amp output sharply.

When the wiper is movedtowa rd the top of the po t.the source becomes moreand more positive . Hence ,the ga te becomes more andmore negative with respectto the source. and more andmore compression bias isreq ui red from the op ampto turn on the FET. It is possible to se t the pot to provide compress ion on anysignal, no ma tter how wea k,o r to pre vent com pressionof a ny but the very sto ngestsigna ls.

An S-meter can be bu iltwh ich will show the rel at ivestre ngth of rece ived signalsby measur ing the compression bias (see Fi g. 6). A simple FE T voltmeter reads thebias generated by the opamp output.

The unit can be mutedfo r full break-in (Q SK) CWoperation if des ired by us-

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Fig. 6. Optional 5-meter circuit.

1). These a re silicon diodeswhi ch will not cond uc t a ta ll until forward voltageacross the junction exceedsabout 0.7 volts . Therefo re ,the base of Q1 won't " see"any output from the toroidu n ti l the vo ltage ri se sa bove 0.7 volts . thus effect ivel y re jec ting low-l e velQRM on the skirts of thefilte r.

The compression thresho ld can be m a nipula tedove r a wide ra nge , if desi red , since compressiondoes no t begin on wea k signals un t il they reach a cert ain minimum vo lt a ge,That's because the FET ispinched off an d some ofthe b ias must be overcomebefo re the FET d ra in beginsto conduct a t a ll.

However, if the dra in isremoved from t he R3-e4tap (l ea ving the o t her components attac hed), and connected to the wiper of apot, this delay of the attackcan be changed at will (see

If reco very tim e werevery sho rt, band noi se ,weak Q RM signa ls sli ghtlyoff freq uency. and o therdistu rba nces would a ppearin the background insta ntlywhenever the desi red station rel eased his ke y - veryti ring a nd disturbing to thereceiving operator. Try it ifyou like , by temporaril y replaci ng C3 with. say, a0.47-/-IF capacitor.

ent. This is because thecompression has reducedthe overa ll gain.

Now tune away from thestrong signa l to a no-signalspot and listen , Noti ce thatafter a few seconds, background noise slowly becomes audible. as the compressor increases gainagain. It has a fast-attack .slow-decay t ime consta nt.

Deca y t ime is se t by R5and C3 in the gate circuit ofthe FET. Resistor a nd capac itor values are chosento give a delay of severalseconds so that the amplif ier won't " pump" on astrong CW signa l. Instead. itredu ces ga in in proportionto the average st rengt h ofthe signa l and keeps thega in reduced d uring thebrief key-up periods between le tters and word sand even du ring b riefpauses .

Operation

Afte r the pro ject passesits "smoke test," you 'reready to lea rn to use it.Hook it up to your receiverand hook up the output to aloudspeaker.

Set the volume controlabout one-fou rth ope n, putthe selec tiv ity switc h in theOff position, a nd turn thecl ipper o n. Feed a steadysignal into the a mpl if ier.The tone from a 100-kHzcalibrator will work fine .Adjust the clipping threshold, no ticing that at theclockwise ext reme of thepot you get no signa l outpu t a t a ll. At the counterclockwise position you getno clipping and at points inbetween clipping is apparent because of the changeof a udio qu a lity of t hecl ipped signa l.

Flip in one filter sec tionand noti ce that the clippeds ig nal sud de n ly sou ndsclean agai n. The harmonicshave been filte red out. Thesecond toroid section won't Changes 10 Play Wilhseem to have much effect The overa ll design of thisin t his test e-butit willi n ac- unit is qui te flexible a nd,tual opera tion. since it is bu ilt in modules,

Now find a place on the with eac h sect ion o n itsrece iver dia l w hic h is fa irly own circu it boa rd , it is qu itecl ear of signals. turn off easy to experiment.clipping and selectivity. Various degrees of selec-and set the rece ive r volume tivitv can be achieved. forcontrol unti l you ca n just example. by shu nting thehear the crackle of back- toroids with resistors, togrou nd noise in the spea ker, broaden the m, o r by add ingor to where yo u can hear a a th ird toroid for extre meweak CW signal. l e a ve the selec tiv ity. Va rious kinds ofvolume control set, a nd active audio fi lters ca n betu ne across the band slow- substituted for the toroids .lv. stopping to listen to Skirt selectivity of the tor-each signal you come to. oid filte rs can be im proved

Loud signals a re no lo ud- by insert ion of two 1N914se r than weak o nes, but you reverse-connec ted in para1-will no tice that the back- lel between the first toroidgro und noi se d isap pea rs a nd the cou p ling capac itorwhile a strong signal is pres- to the base of Q1 (see Fig .36 73Magazine . November.1982

oscillation. and all so rts ofnasties.

In stead, use a commonground on each ci rcui tboard insulated from themounting feet, and co nnec tt he ci rcu it ground with awi re di rect ly to the negativevo ltage tie-point on t hepower supply boa rd.

N<::1w it's on its way to a nother:lr. Or perhaps a boat.Or maybe it'seked safely away.

Becouse this amateur investeda larsen QUIK-Chang e Ra d io

lount System. It lets him move hisld io from one vehicle to a notherstontty - with no manual connec:>OS. So now he con use one radioI several vehicles or several radiosl one vehicle.

The beveled. high impocfIastic slides selt-align and selfonccte for smooth, non-bind ingngagement tim e after tim e.When-e ra d io is re moved, the smallehlcle base blends unnoticed into'Ie interior, with no unsightty conectcos or exposed wires. And when

", See Lis' of Ad.erflsers 0" page 130

the radio is left in the vehicle, theoptional key lock keeps if sate andsecure,

The QUIK-Change works withall rad io ma kes at o nly afraction of the price of a recto.So you c a n errore to hove o nefor each vehicle a nd radiovou own

The next time you vislt youramateur dealer, ask for aQUIK-Change demonstrationIt only toke sa second. And it'llsave yo u a lot o f m inutesc hang ing radios.

••

Write foIlflfolmation.IN Us.-.: LorMn Electronic., Inc. Box 7

11611 N.E 50fhAianue PO 80.111799Voncouvel; WA 98668 PhorJe. 206-573·2122

IN CANADA: ConodIotI Lor.en EIIKIrOflle.. ua.283 E 11'hArooenua UnII 101~ ac V5T 201 P\')()fltI604-872-8517

73 Magazine • November,1 982 37

• •

Fig. 7. Muting circuit added to peak clipper.

I

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'-' "• 200'. 2004.200).,,. lOO6.2" " 4. llfl

51 '"L''' _"00 <it_.IA_

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put and, when used on a carbattery, it hel ps to subdueignition and voltage regulator noises and alternatorwhine.

Troubleshooting

Trou bleshooting the processor is as simple as troubleshooti ng can be. Nothing is c ritical as to value oradj ustment. except that thetuned filter ci rcuits must beon exac tly the same frequency . Fa il ure to o pera teproperly will almost a lwaysprove to be tracea ble to awiring error or a faultydiode, transistor, or Ie chip,a solder bridge on a ci rcu itboa rd, or fa ilure to solder aconnection. •

References

1. George Thurston W4MLE, " AVersatile Receiver Audio System," OST, May, 1962.2. C. W. Andreasen N6WA, "TheAmazing Audio Elix ir: ' 73, september, 1979. Note that the oregram in this article has an error.The lead from CR2 to the gate 01the FET is no r connected 10 thevoltage divider or to the source01 the FET. What is shown as acon nection dot should be a noncon necting cross-over.3. Su itable audio amplifier chipsavailable from Radio Shack ando t he r s uppliers incl ud e:LM1877N·9, dual-channel, twoWatts per channel, (catalognumber 276·702); l M386, onechannel , 4()().mW output (2761731); LM383/TDA2002 , c nec ha nnel awaus (276·703);BA521, one-channel 5.8 Watts(276-704).4. The IC board is available fromseveral suppliers, such as Global Specialties co., 70 Fulton Terrace, Box 1942, New Haven CT06509. or 351 California 51., SanFrancisco CA 94104. or fromRadio Shack, catalog number57&170, for about $3.00 each.This board is perforated lor ICchips and has lands which permit connecting up to four corn.ponents to each IG pin.

The second type of universalboard has a quad land pattern,that is , each cluster 01 fourholes in a square is connectedby fo il. It is excenent lor mounting transistors and other components by their leads. Sold bycarectro (G.C. Electronics), catalog number J4-609, for lessthan $2.00 each .

affect operation of the restof the audio processor.

Sidetone can be injectedinto the ampl ifier when thekey is down, making it appea r in the sa me spea kerwh ich ca rries the incomingsigna ls (see Fig. 3). Since thesidetone is injected afte rthe d ippi ng, compression,and se lectivi ty, it is not affected by processor operation and can be set for anyconve nient pitch o r vo lume.

Several inputs ca n beprovided for t he processor,selecting t hem by switchfrom the fron t panel. Thismakes it possible to use theproce ssor on just about anyreceiver in the shack .

Auxili ary outpu ts oft enco me in handy, too, fordr iving phone patches andsimi la r use s. I prov idedm ine with three front-panelheadphone jacks -one ofeach of the popular sizes ofplugs -so that any handyheadphones can be pluggedin without a hassle .

I bu ilt in a litt le two-inc hspeaker for convenience intesting and portable operation, but a phone jack isprov ided for an externalspeaker. Plugging in the externa l speaker mutes the interna l o ne. Both speakerscan be muted by a fron tpanel switc h, if desired.

A back-panel switc h canbe added to allow operating the unit from an au tomob ile battery for FieldDay or emergency sit uations. The SPOT switc h isconnec ted with the po le tothe inte rna l +1 2-vol t linesof the ci rcuit boards. Onecontact is connected to t heoutput of the 12-volt regula tor chip. The other contact is hooked to a backpanel binding post wh ichgoes to the exte rna l battery.A second bind in g postshould be prov ided to permit connection to the battery negative.

A 1CXX>-jJF 35-volt capacitor is connected from t hepole of t he swi tc h toground. It helps with the fil te ring of the regu la tor ou t-

lOG'C ..,Ot<r-ev I Tu~"S IT OfF.

",......

W hen the key is down,the transistor turns on tosa tura tio n. This offe rs alo w-r e s is t a nc e pa t h toground for the d e bias o nt he diodes. effectivelygro unding both the diodesand the aud io signals passing through them. Becauseof its lower junct io n voltage drop, a germaniumtrans istor will work betterhere t ha n silicon. Even so,mu ting is not absol ute andsome signa l fro m the receiver ge ts through a t lowlevel. The circuit does not

"' ''~!4

ing a transistor switch toclamp the clipper diodeswhen the key is down. Thekeying signal for the transi stor can be a logic low orhigh picked oft from a sol id-sta te elect ronic kever.suc h as the Acc u Kever. orby the relays of other keyers. See Fig. 7.

When the muting transistor is off, which it always iswhen the key is up, it has noeffect on the ope rat ion ofthe d iode c lippe r, bu t SW2must be open for muting tofunction properly ,

38 73Magazine . November. 1982

Microprocessor Controlled

The Drake Theta 550 is a compactTheta550 receive-only communications term inal

and is designed to demodu late andd isp lay the three most popu lar over

tbe-atr modes of data communications: CW (MorseCode), RTTY (Baudot), and ASCII. Any standard TVmonitor can be used.

A full-featured microprocesso r controlled uni t , theDrake Theta 550 has selective calli ng, batterybacked-up memory, audio monitor, and info rmativeL.E.D. tuning indicators. There is also interfacing topermit the addition of a dot matrix pr inter for " hard"copy and a keyer paddle input to permit CWtransmiss ion with full iambic operation.

CW automatically trac ks over a speed range of 5 to50 words pe r minu te and RTTY modes offer nineselectable standard speeds of t ransmission. 12 voltsDC is required.

Thi s unit is ideal for shortwave listeners and hamswho have been missing the increasing vo lume ofdata communications over the air.

The ultimate in communicat ions11Ieta9000E versat i lity, the Drake Theta 9000E

provides complete transceive c apability of CW (Morse COde), RTTY

(Baudot), and ASCII. A full computer AS232 interface,cassette tape storage port, selective calling featurewith answer-back, light pen graphics, prin ter interface and word processing software are all standard.

Seven large 256 character memories are backed upwith battery power so there is no need to reload information with each use. Memor ies may also be partitioned providing up to 29 separate storage locations.A type-ahead buffer of 3120 characters makes it easyto compose your response while still receiving .Operator controlled scrolling permits revi ew of up to10,720 previously received characters. Line length isselectab le at 40 or 80 characters , your choice, and allmode and speed indicators ared isplayed on the screen for instant status recognit ion. ThegOOD E has 3 tone groups and 3sh ifts which are all keyboardselected.

You won't buy any other communicat ions terminalonce you have studied all the advanced operatingconvenience bu ilt into the Drake Theta 900DE. It 'scomplete.

LA7 Line AmplifierLine output, input levels as low as 15 mV rm s (47 kilohm) will resu lt in an output of1 mW nominal into a 600 ohm ba lanced line. Output level adjustable by internal preset level contro l. Interfaces low level audio to RTTY terminal unit or phone line thatrequ ires a 600 ohm balanced/unbalanced input. One 36 " phone to phone cable supplied.

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ANTENNAS

Actual Size

,

73 Magazine Staff

A Tuner for Antenna FanaticsAnyone experimenting with antennas needs a darned good

tuner. Construct this one and save your fina ls.

will accommodate , The Tnetwork is, however, slightly more ted ious to ad justand also to construc t sincethe variable c a pac ito rsused must have both thei rstator and rotor sectionsabove ground . The popu lar" I rensrn atch." by the way.is a basic varia tion of theT network.

But, why not have thebest of both networks in asingle multiband tuner?Th is a rt icle describes aswitchable, mult i-networktuner which is designed tooptimize the matching po ssib ilit ies available us ingcommo nly-avai la ble LIecomponents of moderateelectrical and phy sica l dimensions and , of co urse,of mode rate cost. The tu ner can be tai lored to handie PEP output powersfrom 500 to . 1000 Watts.The physica l d ime nsionsare quite moderate for thepower-handli ng capabilities invo lved and one easily can add su ch features asselectab le anten na switching and swr monitor ing.

and T networks. The basisfor the durability of thesenetworks is a combinationof electrical as well as co nst ructiona l reaso ns.

The Pi network wil l notmatch an extreme range ofim pedances, but it is relatively easy to co nstructand adjust in operation. Itsma in disadvantage is thatit requires c o ns ide ra b leamounts of capacitance onthe lower frequen cy bandswhen work ing into low-impeda nce loads. Usua lly ,padding capacito rs are required across the variablecapacitors o n the lower frequency bands when a highpower tuner is being constructed since 1,000- o r2,OOo-pF variab le capacitors rated at 2 to 3 kilovo ltsare not exact ly commonitems.

On the other hand , the Tnetwork does not requireextreme amounts of capacitance even on the low-freque ncy bands when matching into t he same o r evengreate r range of load impedances than a Pi network

over the yea rs, but twofo rms have evolved as timeproven favorites- the Pi

. I

"

cc lee. 1~_---,

r----- n-;;------ $~ l•I,

III

I,/ I

L s!..' -----~. ---- _.:~.

Fig. 1. Tuner circuitry. The 52 switch arrangement may appear complex, but wiring is not complicated nor are longlead lengths introduced, since most of the wiring is betweenswitch lugs. Normally, a two-wafer switch would have to beused, although single-wafer surplus switches having a 5P3Taction can be found. C1 and 2- at feas t 250 pF each, ratedat 1.5 kV for 300 Watts, 2 kV fo r 500 Watts, and 4 kV for 1kW; L-18 to 281JH, #10 or 12 wire; 51 and 2-CentralabPA-2()(x) series or similar.


.....-------------..,: ' ==@~ &--1 ,.,~~' i/.= ~; cur

s,. :::U.;....--~@) ,

V ar;ous antenna tu nernetworks for the HF

bands ha ve come and gone

Fig. 2. The swr circuitry is simple but sensitive and needs noshielding inside the tuner enclosure. With a 50-Ohm carbonresistor on the Sl side and the meter switch to re flected, adjust C1 for minimum meter reading. Do the same with (2when the resistor is connected to the rf in side and rf is fedinto the Sl a side o f the circuit.

(us ing 1/2" to 3/4" standoff bands. The only thing thatha rdware) and wire it up. you must do, however, is6) Mo u nt the ins u lated to bala nce out the stray cashaft coup li ngs on the van- pacitances in the circuitryable capacitors, extension as noted in the caption forshaft to the a ntenna se lec- Fig. 2. The proced ure istor switch, etc . simp le bu t it cannot be ne-

Of course, you can vary glected if proper readingsthe location of the compo- are to be obtained on 10nents in a variety of ways, and 15 meters.but you should more o r less The mete r used hap-plan ou t the construct ion of pened to be a surplus CBthe t uner in t he man ner il- one that had an swr sca le,lustrated above. It really but any inexpensive metertakes less time to complete with a 2QO.mA or more sensitha n is involved in even as- trve movement will suffice.se mbling a commerc ial kit There is no real need to ca liwhich often has ra ther la- brate the meter since it norborious point-to-poi nt wir- mallv is used only to adjusting instructions . the tuner for a minimum

Another swr bridge ci r- re ad ing in the reflectedcuit was cons truc ted using switc h posit ion once thea toroid-core tra nsfo rme r meter has been ad justed fo rand it worked very well. a ful l-scale read ing in theThe ci rcuitry of the bridge is forwa rd switch position.shown in Fig. 2. The compo- A minor point, by thenents a re mounted on a w ay, about the mete rsmall piece of perfo rated switc h used: It is sp ring-board stock; there is no lo a d ed, so it must beneed to etch a board for the pushed down to read forfew components involved ward and will snap back toand they can be wired toits reflected position (lage t he r d irec tly. be led SWR). This sma ll te-

The board is mounted infi nement makes it ra therside the rear panel of the easy to adjust the tunertuner directly by the input since the way the switchcoaxi al co n nector. No and meter adj ustment conshie ld ing is required since trol a re placed o n the frontthe toroid is largely self- panel t he index finger onshie lding. The sensitivity one hand can be used to deallows fo r measurements p ress the switch while thewith 10 to 20 Watts of tra ns- thu mb and middle finge rmitter output power eve n are used to adj ust t he cano n the low-frequency tro l. The other hand is free

73 Magazine . November,1982 43

."

I Tl"' ~ NQOI<UP ' _ lOI O~ ( _ $(CO~O,UY

/ ,......-~ T _ 2' 000 A.. ,I)()~ T .. t COlO(. .I

too. n oo·tn

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The practical construction details of the tuner a renot diff icul t to foll ow o rperform if you approac hthem on a step-by-step basis. The S~Watt outputra ted version of the tu ner ishoused in an attrac tive twoto ne blue/gray Radio Shackenclosu re (#270-269) measuri ng 7-7/8" X 3-1 /2" x5-7/8". This alumi nu m housing is easy to work and youcan construct the tune r using basic hand tools.

After you have initiallysized-up the p lacement ofcomponents wit hin the enclosure, dril l o r punch o utthe necessary mou nti ngholes on the rear panel forthe coax connectors, on thebottom of the enc losu re forind u c tor a nd ca pac ito rmounti ng, and on the frontpanel for control shafts,switches, meter, etc . Genera lly, t he follow ing sequence of mou nting andwiring and components willmake the tuner go togethereasily:

1) Mount the fron t-panelnetwork changeover switchand the rear-pa nel coaxconnectors.2) Mount the two variablecapacitors. These ca pacitors have to be "above"ground. There are numerous ways to achieve a suitable mou nting. The simples t is pro bably throug hthe use of plast ic #6 mounting screws/nuts with 1/4 ~

spacers to keep the capacitor rotors above ground . Ifsuch material is not readilyavai lab le, a 1/4"-thick pieceof Plexigtasr o r bakelitecan be used to raise the capacitors above the enclosu re bottom usi ng meta lhardware.

3) Wire up t he ne tworkchangeover switch to thecapacitors with leads extended to where t he inducto r and a nte nna se lecto rswitch will be mounted.4) Mount the variable inductor and the swr measu rement circuitry (if used).5) Moun t t he a ntenna se lector switch to the back pane l

If one uses a conventional input/output tuned Pinetwork w ith ext re me lywide-range variab le capacitors, it usually will be foundthat any load that can bematched using both variab le input/output capacitors can also be matchedusing only either a va riableinput or output capacitorsand a suitable value of inductance. However, the capac itance range of a single va riable capacitor required will usually be lessthan the combined capacitance of separate input/output variable capaci tors in aPi network .

The schematic of the tun-e r is shown in Fig. 1. Asshown, it incorpo rates selectab le lC-, Cl-, or T-ne twork tuning, input switching direct to any of threeloads (one of whic h can bea du mmy load), switchi ngusing the tuner network toanyone of two selectableantenna loads, and complete, internal swr measureme nt ci rcuitry. Of cou rse,one can scale up or downthe possibilities shown inthe schematic in any waydesired in order to const ruct just the bas ic tune r,expand the anten na switc hing possibilities, etc .

The reason for having selectable le- or Cl -networktun ing (a reve rsible l network) instead of a simple Pinetwork opt ion is to furtherincrease the m ileage obtainable out of the components used. Since two va riable capacitors have to beused in the design of thetuner, the optio n is available to use them in a conventional Pi-network manner as tunab le input/ou tputcapac itors or to parallelthem and use them as combined output or input capacitors in a reversible lnetwork . The la tt er will provide a greater range of impedance-matching possibilities at the expense ofon ly a bit more componentswitch ing comp lexity, andso it was used .

- •

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Speak ing of contro ls.there is no turns indicatoron the rotary indu ctor .Regular turns counters takeup a lo t of enc los ure spaceand are not all that necessary unless you insi st on ext remely fast control presetting. In rea lity, if you notethe setting of a ll the othercontrol s for the band/antenna being used, it is a sim plematter to rotate the inductor for a pproximate min im um swr and then fini sh upthe tuning by going backand forth between the inductor a nd capacitor tuning controls.

It' s no sec ret that it generall y only makes se nse tohome-brew a tuner if onecan find the co m po ne ntsnecessary at re a so na bl epri ces . If you bu ilt a500-Wa tt version of th istuner using a ll new, off-theshelf par ts, the pa rts costcou ld easily run around

$120. On the other hand , using surplus or new surpluspa rts, the cost cou ld be aslow as $25. Sim ply huntaround for the parts neededat the right prices. Fa irRad io Sa les (1016 E. Eureka .Box 1105, lima OH 45802),for instance, which frequ ently ad ve rt ises in 73,often has very good buys o ntran sm itt ing-type variablecapac itors a nd ind ucto rs.

The tuner has been labeled as a " Unive rsa l Coupl ing Unit ." That e uphuist icname was only the re sult ofhaving a limited sele c t iono f words available in a rubon lettering se t. No tunerwill , of course, couple toabsolutely a ll loads. Thetuner described will co uplea SG-Ohm o utput transmitter to just about any reasonable antenn a load ; thesa me as can be done byco m me rc ia lly a vailabl etuners wh ich use the sametype of c irc u it ry and component dimensions.•

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Digital BasicsThis is no time to be a digital illiterate. Part III reveals the

secrets of multivibrators, shift registers,and other notorious devices.

,· -----1-,-,-- --

lo~eph I- Carr K4/PV5440 South 8th RoodAr/inglOn VA 21104

Fig. l(b). A retriggerable moaos teble multivibrator can beretriggered while the output is still HIGH. Note that thetotal durat ion of the HIG H state is no t 21.46 73Magazine . November, 1982

causes the Q to go HI GHfor a time, but since this isnot a sta ble state, Q willd rop lOW agai n when apre-determined time periodhas e lapsed, Monosta blemu lt iv ib ra to rs a re a lsoca lled one-shot circuits andalso (e rro neous ly, a lbeitgraphica lly) pulse-stretchercircuits. The latter label is amisnomer because the circ ui t does not actua llyst retc h a pu lse bu t gene rates a new pulse that has alonge r period ,

The bistable multivibrator has two stable states. Itcan remain in either stateIi .e. . Q=lOW o r Q=HI GH) indef inite ly. The RSfl ip-flop is an example of ab istable multiv ibretor.

The asta ble rn ultivib rato rhas no stable states. It is in-

various digitaltC logic families . assorted types ofgates, and a va riety of flipflops . We now will tu rn tothe subjects of rnul tivi bretors and counte rs ,

Multi \'ibra tors

A rnultiv ibrator is basically a pulse-producing circuit. There are three basicforms of multivibrato r:monostable, bistable, andastable. It takes littl e imagina tion to detect tha t thesedesignat ions refe r to thestable output states that arepossible for each type ofcircuit.

The monostable multivibrator has but one stablestate (usua lly the sta te inwhich Q = l OW . but no ta lways). Tr igger ing themonos tab le multiv ibrator

'.'-- - - -"

II

The first two parts of thisthree-part series led you

step by step into the digitalelectronics swimming pool.We now can wade in pastthe ankle-deep wa te r of thekidd ies' pool and ventureinto knee-deep water. Thusfar . we have discussed the

:- -+'- -1

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,

Fig. l ea). One-shot multivibrator. Trigger pulse causesou tput to go HIGH for peri.od T. The second pulse hasno effect.

Fig. 4. Ffip-flops can be combined in series to form a register which can store several bits ofda ta. This version has serial inpu t and either serial (5150) ou tpu t or parallel (51PO) ou tput.

73 Magazine • Nouember,1 982 47

r

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4 0 .3 "'"

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,

o

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Fig. 2(b). The potentia lac ross ( 1 never dropsbelow 0.6 vo lts because o fthe presence o f D 1.

Fig. 3. M ono stab le m ult ivibrator. The d iode in Fig 21a)is elimina ted b y using Q1 rod ischarge 0 .

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PARALLEL OUT PUT S

Fig. 2(a). A ( M OS fl ip-flop is the basis for th is monostablemuft ivibrator. R1 and (1 determine the length o f the pulse.D1 allows the fl ip-flop to be retriggered immediatel y afterclearing.

o ne-shot. is determi ned bythe time constant of R1 C1and the potentia ls of the Qoutput and the po int atwhich the clear input t hinkstha t it is HI GH instead ofLOW.

The c ircuit in Fig, 2{a)uses a d iode (0 1) ac ross thetimi ng resisto r (R1) to di scha rge C1 during the periodwhen Q is lOW. This diodeis not strict ly necessary butse rves to speed up the ci rcui t consid erab ly. Without0 1. the cha rge on capacitor( 1 would bleed off throughR1 . But this wou ld requireano the r R1 ( 1 time constant(or so) before the vo ltageac ross ( 1 woul d disc ha rgeenough to permit retriggering of the o ne-shot. The purpose of 01 is to disc harge( 1 rapidly so that retriggering can occur a lmos t immediately after Q drops lOW-see the waveform in Fig.2Ib).

The use of 01 creates ali tt le proble m . ho we ve r.

"

• • • • • • • • • •,n '" '" ... ..., , e , <

a) W hen the ci rcu it is atrest. Q is lOW and anycharge on ca pac itor C1 isdrained off t hrou gh d iodeD1 .

b) When a trigge r pulse isreceived by the (LK inpu t.Q goes HIGH. When Q isHIGH. ca pac ito r C1 willcharge through resistor R1.

c ) W hen ( 1 has chargedto a potential of approximatel y 2 volts. the clear input thi nks it is H IGH, so theFF will force Q l OW.

d) The period that Q wasHI GH. i.e., the period of the

An exam ple of a monosta ble multivibrator builtfrom a CMOS type-D flipflop is shown in Fig. 2. Reca ll t he rules for the type-DFF: (1) Si nce 0 is HIGH. aHI GH will be transferred tothe Q output whe n the e LKline goes H IGH. and (2)when the clea r line goesHI GH. the Q output isfo rced lOW. The operationof the one-shot c ircuit inFig. 2. then, is as follows :

Now consider Fig. 1(b).This is a timi ng diagram forthe ret riggerable monosteble multivibretor. The output goes HIGH when thefirst pulse a rrives. But befo re T expires. a second trigger pulse is received . Thissecond pulse causes theone-s hot to retr igger. so theoutput wi ll rema in HIGHfo r an add itiona l period T.Note t hat t he total d urat ionof the HIGH sta te is not 2T.but T plus the portion of thefirst period that expiredprior to the seco nd trigger.or T +(Tl -T ,).

capable of rema ining in either Q l O W or Q HIGHsta tes . The Q output of theastable multivibrator willflip back and fo rth betweenthe HIGH and lOW states.producing a square-wavepul se-train o utput signa l.For this reason. the astab leci rcuit is usu a lly used toprod uce the clock pulsesfound in d igital c ircu its .

There a re seve ral ways top roduce each of thesetypes of multivibrat or.Space prevents us fromco nsidering all of them. Wewill examine a few ci rcuitsbu ilt from discrete gatesa nd the integrated ci rcuits .Some IC devices. like the555 timer. wil l operate in eithe r t he mo nos table o rastab le mode.

When we speak of bistab le mul tivibretors. we actual ly a re ta lking about theRS flip-flop . Reca ll from theearlie r sect ions of this a rticle that the RS FF can remain happily in either theQ= LOW DC the Q= HI GHsta tes indefinitely .

Most monostable multivibra to rs will no t respo ndto further input triggerpu lses un t il t he per iod ofthe outp ut pulse has " t imedout," i e .. the output has retu rned to its sta b le sta le .Monostables that will notrespo nd to furt her triggerco mmands until the outputduration has expired arenonretriggerable rnono stables.

Some o ne-shot circuits.however. a re teuiggeteble,mean ing that they will respo nd to fu rt he r inpu t tr igger comma nds whi le theone-shot is in the unsta blesta te (i.e., befo re it ha st imed out). Consider Fig. 1to see how th is works. Fig.1(a ) shows the operation o fthe regul a r nonretnggerable o ne-shot multivibrator. The first trigger pulsecauses the output to goHIG H and it remai ns H IGHfo r period T. A second trigger pulse has no effec t onthe one-shot because it occurs before T exp ires,

L-----,I

,,•

•a

,•

,

Fig. 8. A rec ircu fat ing shift register automat iealfy couplesthe output data bad to the input. This is something (ike adog chasing irs tail.

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,,- - - ---'

0>- - - - - - -

0> - - -

,-rl'----- _

Fig. 5. The data bit (0) ;s transmitted through a f ive-stageStSO shift register b y clocking the register five rimes.

Fig. 7. The jam parallel-input shif f register eliminates theneed to clear the registers.

ter. At the occu rrence ofthe first c loc k pu lse . the input line is HIGH . This pointis the 0 input of FF1 . so aHIGH. wh ich is a pplied tothe 0 input o f the secondflip-flop (FF2), remains a fterthe clock pulse disap pea rs.

When the seco nd clockpulse a rrives, FF 2 sees aHIGH o n its 0 input andFF1 sees a l OW on its 0 input. Th is situat ion causes alOW at Q1 a nd a HI GH a tQ2 .

The th ird clock pulsesees a lOW cond it ion onthe 0 inputs of FF1 a nd FF2and a HIG H at the input ofFF3. The th ird c lock pulse.then. causes Q1 a nd Q2 tobe lOW and Q 3 to beHIGH .

Note that the 5150 inputremains lOW after the initia l HIGH durin g cl ockpulse number 1. This meansthat the single HI GH cond it ion will he propaga tedthro ugh the e ntire 5150shift reg ister, o ne stage a t atime. The HI GH bit willshift one fl ip-flop to theright each time a clockpulse arrives.

If the data a t the inputhad changed. then the bitpatte rn a t that input wouldbe pro paga ted through theshift register .

The shift reg iste r in Fig. 4is a five-bi t. or five-stage,re g ist e r (any bit le ng thcould be se lec ted). On thesixth clock pul se. therefore.the HIG H is propagated outof the register. so all flipflops a re now lOW.

Fig. 9(b). A sing le I -K flipf lop is a divide-by -twocounter.

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r' 4 rI B, ,Fr 3 , " 4

' -, ., -,- '-

'"•

~" '", ., ,-

Fig. 9(a). The core of mos rfrequenc y counter.~ i.~ theI -K flip-flop con figurat ion.In th i.~ case, the J and K inputs are both tied wen

Fig . IO(a). By cascadingsevera l I-K flip -flops. thedivis ion ratio increases bypowers o f two.

in-para /Je/-our (PIPO ), andparalleJ-in-seriaf-out (PI50).

Fig. 4 represents both5150 and SIPO shift regi sters. The only significa ntdifference is that the parallel output lines, used on the51PO reg iste r, wou ld be absent o n the 5150 regi ster.

The SIPO shift registerconsists of a cascade c ha inof type-D flip-f lops thathave their clock lines con

'nected together. Rec all therules for type-D fl ip-flops:Data can be transferredfrom the 0 input to the Qoutput o nly when the clockinput is HIGH. The inputca n c ha nge at will a nd theoutput will remain the sa meas long as the clock line islOW. But if the clock linegoes HIGH, the Q outputwill follow the 0 input . TheQ output wil l retain the lastva lid data present beforethe clock d ropped l O Wagai n.

This rule can he a pp liedto the situation shown inFig. 5. where we show thetra nsm ission of a single bitof data fro m left to rightthrough a 5150 shift regi s-

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The c ha rge potential across(1 ca nno t drop lower thanthe function potential ofthe diode (200 to 300 milli volts in germanium typesand 600 to 700 millivolts fo rsilicon types). Fig. 3 showsthe ci rcuit fo r a mod ifiedversio n that uses switc hingtransistor Q l to disc ha rge( 1 . The base of transistorQ1 is driven by t he NOT-Qoutput of the 401 3 flip -flop

When two or more flipfl ops are organized to storemultiple bits of data . thenthey constitute a register .M ost registers are merel yspecia ll y-co nnected arraysof fl ip-flops.

There are several different circuit conf igurationsthat one wou ld ca ll a register, a nd we classi fy themaccording to the manner inwhich da ta is input and output to and from them . We

Shift Registers have, fo r example. seriet-in-A flip-f lop is able to sto re sene t-out (5150). seriet-in

a sing le bit of digita l data. parallel-out (SIPO), parallel48 73MagaZine • November. 1982

Fig. 6. Data is entered info t his paraflef-entr y shift registervia 81-Bn- Before entry, the register is reset via R. The data isthen loaded by bringing the _H~t Jine (5) H IGH.

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·BC·30 reqoued tc charge Bp·2 & Bp·5CP-I C,g Ilghler plug & cord: Bp·3 9.50DC·I DC operation mod ule 17.50FA·2 Fle_lble antenna for 2.1., 2AT (B NC) 10.00HM·9 Speakel/mlcrophone 34.50LC·2A Leather case ",/0 TTP cutout. 34 95LC·2AT Lea thel case ", ITTI' cetect.. 34,95ML·I 2m mobile lInear (Reg $89) .. •.••._S ALE 79,953A-TTH 16-bu1t041 TTP trOll!: 2A/3A/ 4A.. 39.~

Iommspec SS·32M az.rcne encoder 29.95IC- MI2 l2eh Manne Hand·he ld .. .. Speclal $229.95O rlw r ICOM "r(;'"or;",,:24PP 24,pm accessofy plug $ 4 00BC-I OA Mem. bark-up; 25A1720AI7301740 9 50BU- I MemOly bac~-<Jp . 25A1490A. 38,15EX-2 Relay bel _/markef; 720AI730 3-4,00HM·3 OeIule mobile mI( . specd~ "dID 17.~

HM·S Norse canl mobile mlC. 4 pm 3".~

HM-7 Am~lhed mob,le rmc. g.om 29.00HM-8 Ieucn.tcne rmc. 8·pin 49.50HM-IO Sca nning microphone 39. 50HP-I Headphones 34.505M·5 g.cm eectret desk me.. 39.00,All SolIl t" P'K~ wbjNt 10 (hollngt" ", ilhoul nolict"~

~a::i VIS4·" X /

AES STORE HOURSMon. th ru Fri. 9-5:30; Sat. 9-3E-X-P-A-N-O-E-O WArs HOURSMlI..aukee WA TS kne lInsW'tl"ed unbl 8 pm t.tm. ItIru Thurs

Please use WATS line 'or Placing Orders.For other mtcrmatcn. etc. please use Regula r li ne.

IC·290A 2m All Mode mobt le _CVf. 1438·148199MHz. 1110... 5 memcees. 2 VFOs. TIT rruc 6"'·_ '2\;·h · 8"'1~d , (Reg, $549) Closeout S399.95IC·290H 25.. 2m All Mode (Reg $549) SALE 489,95IC·490A UHf All Mode mcbrle xcvr 430·439995MHz. 10.., memcnes.t..o VfOs. scanning rmc-cphone2'7"h • 6~"... 8'''"d (Reg $649) .... SALE $579.95IC·560 6m SSB/ fM/CW mobtle _CVI , 10",. digItal .memoees. scan. two VfQs 13 8vdc/15A 2 \1>~h ' 7'.·_*9"d. glbs. MIC, & mt. (Reg $489j . ._S ALE S439.95

IC·25A Compacl2m fMmobile l CV I 25... S memcnes.su n. pllonty , 2 VfOs. TIT eucrophone 2"h ' 5'1,«..• rd, 3L"lbs. (Reg. $349) SALE SJ09.95IC·.5A 440·450 mobile scvr TBAIC·22U 2m mobile. l/lOw. thumb..heel rreq. selec t6 '~"w ' 2'1"h ' 8" ·d. (Reg $299) SALk $24'l95(x· !99 Remote IleQuency selector 35.00vnrrt 'Hf Porl.lb!po, -IC-202S 2m SSBtransceoer 3... PEP output uses rr"cells. opnonar Nlcad pad.lchargel or AC supply/spkrWith me, ant & strap (Reg $279) SAlE $249.95

IC-20L 2m, lOw- ampt (Reg. $98) SALE 89,95IC-402 432 Mhzportable sse Transceiver. Featuressame as IC·202S above (Reg $389) SALE 349.95

IC- 30L I(},o, . 432 amp. IReg $105] SALE 94 95Be· 15 Nltads & 1£ chgr 101 202Sl402 57~BC·20 t«ads & OC·DC chgl 101 202SI402 57.50IC · ~5 6m sse port lReg $449} SALE 399.95

f M module 49.95lntemal ",cad baltef~ pack 79.50AC chMge!. 12.50

SP4 Remote speaker for portables 24.95

IC-25IA 2mAII·mode xcvr 144 8·148.1999 MHz 10w.digital . memones. scan. 2 VFOs 118vdc /l17vac 4'Ij ·h• 9....•.. . 10" ·d. 11 tbs {Reg. $749}... SALE SS99,95IC·..SIA UHF All Mode Transctl¥er tor OSCAR mode BOIJ &Slmple_, Models 101 430-440 01 440-450 MHz SImIlar10 IC·2SIA (Regular $899) SALE S769.95

IC·AG I UHF Preamp (Reg. $89) SALE 79.95IC·551O 6mSSB/CW/F M* t-anscever. 50·53999 MHz80 watts. (Reg. $699) SALE $599.95EU06' FMadaptor (Reg, $125) SALE 112.95PS·20 AC power supply (Reg $229) SALE 199.95

CF·1 Cooling Ian; PS·20... . .. . .... ... .. . .. . . . "5.00

IC-73O 8-band XcVI (Reg S829) SALE S649.95H·30 SSB Illter (passbaoo fUlling) 59.SO(x·195 Minker unit 39.00EX-202 LOAmtertace: 730I2KL/AH- 1.. 27.50[x·20l 150 Hz CWaudio Irlte r. 39,00(x ·20S lransverter sWitching unit. 29,00

Ic·nOA g·b.Jnd XcYI (Reg. $1349).. SALE Slm.OOH·J2 500Hz CW litter 59.SOFL·).4 52 KHz AMnner. 49.SO

IC-140 9-band Xcvr (Reg $1099) SAL S97995H-238 Internal power su p~y TBAEX-24 1 Marker 1,1011 .. .. . .. ..... ... . . .•.. .... .. . .. . ... TBAEX- 242 FMurn!... fBAEX-243 Becfronc keyer crnr.. TSAEX-S" 9 MHl !iOO HlI,ller TSAEX-52 455 KHl!iOO Hz CW hlter.•.. .. . ...... . •. •.. . TSAEX·S3 455 KHl250 Hz CWfilter TSAArc..""r;{'> com",o" 10 IC-720/ 7301740PS-1 5 Power supply (Reg $1 491 SALE $1 34.95

CF·I Cooling tantOl PS·15 5.00[X·I Maplo/ tOl CF-I on P$·15 6.~

PS-20 lOA powel supply (Reg $2291 . . SALE 199.95Cf·! Col:W!g fan 101 PS-20 "5.(10AdaptOf cable; PS-20 to 72017301140 10,00

fl·.... SSBhtter: 7301740 (Reg $1591 SALE 1.....95fl·"S 500 Hz CW!liter; 7301740 S9,~

SM·5 Electret desk microphone 39,00HM·IO Scanning mobi le rnc: 730/740 , 39,50SP·3 Base staten speaker "9.50MB·5 Mobile mount, 720.1.1730 19.50PhOllf Pitch spei;lty ladlO (Reg, $139) SALE 129,95AH·! MobIle anUtul'lel (Reg. $2891 .. .. SALE 259,95AT-!oo 100wl autc/otuner (Reg, $J491 .. SALE 31",95,I,T-5OO 500w auto. tUlle! (Reg $449) •• SALE 399.95IC-2KL SoIid·state Imear tRego $1795) SALE $1 395,00

IC-R70 Gen. cov receiver IReg $795) SALE $699,95

SAVE 55 - HF Equipment

In Wisconsin (outside Milwaukee Metro Area)1-800-242-5195

WICKLIFFE. Ohio 4409228940 Euclid Avenue

Phone (216) 585-1388Ohio WAfS 1-800-362-0290

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Order Toll Free: 1-ouO-558-0411

AMATEUR ELECTRONIC SUPPLY/n~4828 W. Fond du lac Avenue; Milwaukee, WI 53216 - Phone (414) 442-4200-------AES BRANCH STORES Associate Store

ORLANDO. Fla. 32803 CLEARWATER. Fla" 33515 LAS VEGAS, Nev. 89106 CHICAGO. Illinois 60630621 Commonwealth A¥e. 1898 Drew Street 1072 N. Rancho Olive ER IC KSON COMM UN ICATIONSPhone (305) 894-3238 Phone (813) "61-4267 Phone (702) 647·3114 5456 N. Milwaukee A~nue

Fla . WAfS 1-800-432-9424 No In-State WATS No In·State WAYS Phone (312) 631·5181

~~t~~lIae 1-800-327-1917 No Natio nwide WAYS ~~~~at 1-800-634«6227 ~i~~~ 1-800-621-5802

73MagaZine • November. 1982 · 49

•,

Fig. 10(b). A modulo-16 ripple counter has four outputs.

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nected so that the binarycoded output is convertedto a decimal display.

There a re two basicclasses of digita l counterci rcu its, seria l and para ll e l.The se rial cou nte rs a recalled ripple counters because a change in the inputmust rip p le through allstages of the counter to itsprope r poi nt. Parallelcounters a lso are calledsync hronous counters.

In a ripple counte r, thedata is transfe rred seria lly.which means that the output of one stage becomesthe input of the next stage.

The basic element inmost counters is the J-K flipflop. See Fig. 9(a). Note inthe figure that the I and Kinputs a re perma nent ly t iedHIG H. so they will remainactive .

A timing diagram for thisdivide-by-two circuit isshown in Fig. 9(b), and itshows the action of the c ircuit. J-K FF outputs changesta te on negat ive-goingtra nsitions of the clockpu lse. In Fig 9(b). the firstnegattve-going transitioncauses the Q output to goHIG H. Q will remain HIGHuntil the input sees anothernega t ive-go ing clock pulse.At tha t t ime, the output willdrop l OW. The action requ ired to make a completeoutput requires two clockpulses. so this J-K flip-flop isdividing the input frequency by two.

We can make a binaryri pple counter by cascad ingtwo or mo re stages, asshown in Fig. 1<Xa). This particula r circuit uses four J-KFFs in cascade. Any number, however. could beused.

The major problem withthis type of counter is thatonly t hose divis ion ratiosthat are powers of two canbe accommodated. In thefou r-stage circuit shown.the possible division ratiosare 2, 4. 8. and 16.

Frequency division is onema jor use fo r a counte r circu it. In some elec tro nic inst ruments, fo r exam ple, wemay wa nt to prescale a fre-

e•

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, ,, .

put. so that a read operation wou ld automatica llyrewri te the da ta back intothe shift registe r.

Digital CountersA digital counter is a de

vice or circuit that operatesas a frequency divider . Themost basic digita l counter isthe J-K flip-flo p connectedwith the I and K inputs t iedHI GH (i.e., placed in theclocked mode). This makesthe output produce o neoutput pulse fo r every twoinput pulses . It is. then . a bina ry or divide-by-twocounter.

Those fa ncy d igital frequency/period counte rs arenoth in g more than dig ita ldivide-by-1 0 counters con-

, ,----= :...- O'E RIllD T,-12 C(lUJol[ .

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Fig. 11(b). After ten pulses, the counterresets. The result is adecimal-based counter.

Fig. 11(a). A counter can have something other than a divide-by-two ratio when the flip -flops are forced to reset. The74DO turns a divide-bv-sixteen counter into a divide-byten circuit.

Para llel-ent ry shift registers are faste r to load thanserial-input shift registers.This is because a single bitcan be changed. if needed.In the serial type. to changea single bit of data requiresus to ri pp le t hrough the entire contents.

The re a re two basicforms of parallel data entry:paralfel and jam . In parallelentry. shown in the partial the non-complemented in-schematic of Fig. 6, the reg- puts. el iminating the needister must fi rst be cleared to clea r the registe r before(i.e.• al l bits set to ze ro) by load ing.bri nging the reset line mo- A reci rcu lat ing shift reg-mentarily lOW. The data ister is shown in Fig. 8. Sincethat is applied to inputs B1 the output of a seria l shiftthrough Bn can be loaded register allows the outsideinto the register by momen- world to see only one bit attarily bringing the set line a time, we must empty theHI GH . entire contents of the sh ift

The jam en try circu it register in orde r to readshown in the part ial sche- these conte nts. But t hatmatic of Fig. 7. is also able wou ld ord inarily des troyto load data from bits B1 the d ata. because the inputthrough Bn. While jam en- would be HIGH or l OWtry may not look superior at du ri ng the entire operation.first glance, it is, because Ie A single-read operation.shift registe rs using this then, wou ld fill up the registec hnique have interna l inte r with a ll ones or zeros.ve rter stages at t he comple- The recirculating sh ift reg ismerit inpu ts. These have te r connec ts the o ut put Isethei r inputs connected to rial output) back to t he in50 73 Magazine · November, 1982

The 5150 shift registercan be made into a 51 POdevice by adding paralleloutput lines at Q1, Q2, Q3,Q4, and Q5.

One use for the SIPO register is seria l-to-parallel binary-code conversion. Foreconomic reasons, digitaldata usually is transmittedas a serial st ream of bits,i.e., the bits of the digita lword are sent over a communications link. But mostcomputers and other digitalinstruments use a para llelfo rm of data entry . Paralleldata transfer is more expensive but is considerablyfaster than serial transmission . If. fo r example. wehave an eight-bit system,we would need an eightstage SIPO shift registe r toconvert the serial code toparallel form. The code isentered into the SI PO register one bit at a time so thatafter eight clock pulses thefirst bit will appea r at Q8and the last bit at Q1 .

16MODELS

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73 Magazine . Nove mber,1982 51

•

Fig. 12. By feed ing the clock inputs in paralle l. a synchronous counter becomes much fa"fer than the ripple version.

F;~. 13. A preset counter can be made by using J jam input.When CP2 is raised HICII, a pre.~et bit pattern is entered.

Fig H (a). A counter can count down by toggling each flipflop with the preceding stage 's Q output.

The output o f the NANDgate will keep the cl ear lineH IGH for all c o u n t sth rough 10. The inputs ofthis gate are connected tothe Band D lines. The D linestays LOW, forcing clearHIGH up until the 8th inputpu lse has passed, At th att ime- To in Fig. 11 (b)- Dwill go HIGH and b it Sdrops LOW, so the clearline remains HI GH for the9th pul se .

The clear line will remainHIGH unti l the end of the10th pulse. At that pointff I )both Sand D are HIGH, sothe NAND gate out putdrops LOW, clearing allfou r flip-flops (i.e.. forcingthem to the state where allfour Q outputs are LOW).The counter is therefore reset to 000(1

The reset counter produces a ooסס code, so the Band 0 outpu ts are nowLO W, forcing the c lear lineHIGH again. The entire reset cycle occurs during per iod TJ- T I)' This period hasbeen expanded greatly forgrap hic illust rat io n purposes in the figure, but actually takes onl y nanoseconds or micro seconds.

The 11 th pu lse will increment the counter one time,so the output will be 0001 J.

The count sequence, in decimal, then, is 0-1 -2-3-4-5--6-78-9{)-1 etc. The outputcode is a ten-digit vers ion offou r-bit binary (hexadec imal) and is called binarycoded decima l, or BCD.

Synchronous Counters.Ripple counters suffer f romone ma jor problem: slowspeed. The counter elements are w ired in cascade,so an input pu lse must ripple through the ent ire chainbefore it affects the output.

The idea behind the ci rcuit of Fig. 11 is to clear thecou nter to ooסס fol lowingthe tenth input pu lse. Let' sexamine the timing diagramin Fig. 11{b) to see if the ci rcuit does the correct thing .Up until the 10th pu lse. thisdiagram is the same as forthe base-16 counter discussed prev iously .

Ii.e., 210) because two pulseshave passed. Note that Osis HI GH and al l others areLOW. The digital word is,indeed, 0010 J .

The counter in Fig. 10(a)is called a modufo-16 , orbase-16, counter, or a hexadecimal counter (al l meaning the same thing). Theoutput of a hexadecimalcounter can be decoded todrive a display device thatindicates 0 through 9 Ii.e..decimal) o r 0 through F(hexadeci ma l). In most appl ications where a real, l ive,human is to read the display, a decimal readout isprov ided.

Decimal Counters. A decim al coun ter operates inthe base-lO, or decimal,number system , The mostsignificant bit of a decimalcounter produces one output pulse for every ten input pulses. Decimal counters are also somet imescalled decade counters . Thedecimal counter forms thebasis for digital event, period, and frequency counters ,Thus, t he hexadeci m a lcounter in Fig. 10 is not suitable for decimal countingunless it is modified forbase-l0 operation.

Fig, 11 shows a TTL hexcounter modified by addinga single TTL NAND gate.Recall that a TTL J-K FFuses inverted inputs for theclea r and set functions. Aslong as the clear input remains HI GH , the f lip-flopwi ll f unct ion normally, butwhen the clear input is momentarily brought LOW,then the 0 output of the FFgoes LOW.

The decade counter inFig. 11{a) is connected sothat all fou r clear inputs aret ied together to form acom mon clea r l ine. Thi sline is connected to the ou tput of a TTL NAND gate(i e.. one sec tion of a 7400device). Recall the rules ofope ra tion fo r the TT LNAN D gate: If ei ther inpu tgoes LOW, then the outputgoes HI GH, but if both inputs are HIG H, then theoutput goes LOW.

TO OT"I£RSTAGES

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quencv. i.e., divide it from These are weighted In aso me other frequency to a 1·2-4-8 code system to replower frequency that can resent decimal d igits 0 to 9be handled by a digita l o r hexadecima l digits 0 tocounter or other digital in- 15. These are the norm alstrument. weights of the binary num-

But this is only one appJi- ber system .cat ion for the counter c ir- Consider the timing diecuit . One of the most com- gram of Fig. 10(b). Note thatman appl icat ions, alluded al l B output changes occurto in the last paragraph, is foll owing the arrival of ato count, i e .. te ll us the to- pulse. After pul se numbertal number of pu lses that one has passed, the QA linepassed. Consider again the is HIGH and all others arecircuit of Fig. 10(a) and the LO W . This mea ns that thetim ing diagram of Fig. 10(b). binary word on the outputOutputs A, B. C, and D are lines is 0001 2 (i.e., 1 10) ; onecoded in binary, w ith A be- pulse has passed.ing the least significant bit Following pu lse numberand D the most significant. 2 we would expect 0010 J


Cl OU

•I

appcz' + TRS-SD'APPLE REVIEW WINDOW

TERMINAll IS a hardware and softwaresystem thaI converts your personal computer into a state of the art commurscalions tefrTlfnal. T8fminall features simpleconnections to your computer and radioplus sophisticated and reliable software.

Simplicity

TERMINAll was ~ned from theoutset 10 be easy 10 connect to 'lOOT radioand easy to use. Plug into your receiverheadphone jack and copy Morse Code 01radioteletvpe IATTYI. Plug into your CWkey jack and send Morse Code. Artecn amicrophone connector and send Baudotor ASCII RTTY using audIO tones fAFSKI.Tbets all there is to hoOking it up.

The software is loaded into your computerfrom disk Of casset te. Enter your caUsignand the time and you will start receivingimmediately. No sel1lngs or &dtustmemsare necessary to receive Morse Code, it'slully automatic -and it worksl You maytype your message while receiving ortransmitting.

You ~ be on the air, receiving andtransmittmg in any mode, in minutes Asvve said. TEAMINAll is SImple.

keyboard eeecteoe - and uses ei ther theDllnel meter Of scope outputs for easy tuning. Copy the W9ak ones. Copy the noisyones. Copy the fading ones,

• Built In crystat controUed AFSK.Rock stable for even the most demandingVHF or HF acceceucos . A must on manyVHF ATTY repeaters.

• Built in 110 or 220 volt AC power supply.

• Buitt In peral" printer driver softWIIra. Stmply attach 8 parallel ASCl!printer le.g. the EPSON MX-f.K}I to yourprinter port to obtain hardcopy in afImodes.

• Multilevel dlsplavs - allows exemrn109 and editing of histor ical text .

• Word wrapping, word mode edIting,diddle, Ignore carriage returns, user orogrammable end of line sequence. adjustable carriage w idth, multiple userdefined WRU, transmit delay Hixed. none

I --.-!!!'

TRS-BO NORMAL DISPLAY

Of aut o ececuvet. break mode and morel

• TM all-in-one TERMINAll designmakes it great for use on HF or VHF, Ham,Commercial. SWl or MARS! swt:s.TEAMINAll may be Jumpered lor either425 or 850 Hz reception to copy news andw eather services.

I

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• TEAMINAll has the ATTY terminalunit - oercc and AFSK - butlt in. Thisresans in a lower total cost.

• Fanta.tlc Morse reception. Sixstage active fil ter demodulator copies theweak ones. Auto adap tive M orsealgonthm copies the sloppy ones. REICEllveel code speed displayed on stetcs line.

• OuUtanding d~umMtatlon. Pro-fessionally written, 90 page user manualcontains step-bv-sten instructions.

• Built In, Mpel1lta, muttl...tage, ac·tlve filter RTTY and CW demodulators.No Phase Iod:: loops. ATTY demodulatorhas 170 and ei ther 425 or 850 Hz shif t-

The communications terminal that does it alii

...S"e L'~I or Advem sers on pafl" 130 73 Magazine · November,1 982 53

•,

• , , •

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o. ,S- '" S- ."

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Fig. 14{b). This decade counter cowus down, starting at thebinary state 100 1.

-~ --";I"

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NOW TWO MODELS TOSERVE YOU BETTER

YOUR OWN Pfl IV'ATE AUTOPATCH

..... ,

NOIIAX om"".c;a ~0lJ' Itron4ll,Cl _ 2 ..--. 220; 450". lite. BaM51&IIon and , •• 4""• . Ulong • I'IigPl spetoCl ICIIn ....lCh,ng *1'1n;qu. 10 ttwl ~ can el•...,1 Cll&1 from your automobile Of w ltI'Iyou_ HT from ."" _yard Of pooIIidlt - ""__Iy ... Eur'onllallllhOf' t •• "Kei.....rs. INlunng -.>lid ltale ....'ICI'lU'O. otlIH _multi ... "'v.il.t>~ ,nlert~ ....,tIl In !COM 22U.

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A sy nc h ro no u s cou nter 5 '0 (01011), We cou ld presetfeeds the clock input to all the counter to 0101 andflip-flops in parallel , and then increment from there.th is results in a much faster Fig . 13 shows a co mmonoperation . method for achieving pre--

Fig. 12 shows a pa rtia l set condit ions for the ismschem at ic for a svrctvo- input. Only two stages arenous binary counter. We ec- shown here, but adding twocampi ish synchronous op- additiona l stages w ill makeeration by using four f1i p- it a four-bit cou nter. O fflops, w ith clock inputs tied cou rse , any number o ftogether, and a pair of AND stages may be connected ingates. cascade to form an n but

One AND gate is con- preset counter.nected so that both Q1 and In Fig. 13, t he p resetQ2 are H IGH before FF3 is count is applied to points Aactive. Simi larly, Q2 and and B, and both bits wi ll beQ3 must be HIGH before entered sim u lt aneo us l yFF4 is made active. On a when clock line CP2 isclock pulse, any of the four brought H IGH . line CP2 isf li p-f lops sc hed u led t o sometimes ca l led the enterchange will do so simulta- or jam terminal. O nce theneou sl v . Synchronou s preset bit pattern is encounter s attain faster tered, the counter will inspeed s, although ri pp le c remen t from t his withcounters seem to predom i- every transit io n of c locknate in most applications. l ine CP1 .

Preset Counters. A preset Down Counters . A downcounter increments from a counter decrements, inpre set point other t han stead of incrementing, theOO<Xl, For example, suppose coun t for eac h excu rsion ofwe wanted to count from the inpu t pu lse, If the reset

54 73Magazine " November,l982

ments from 1001 in the decim al sequence 9-8-7-6-5-4-3-2-1-0-9 etc.

Up/Down counters. Somecounters wi ll operate inboth up and down modes,depend ing upon the logiclevel applied to a mode input. Fig, 15 shows a representative circuit in whichthe first two stages of a cascade counter are modi fiedby the addition of severalgates. If the mode input isH IGH, then the circuit is anup counter, but i f the modein put is l OW, then the circu it operates as a downcounter.

Concl usion

This three-part series hasoffered you the ba sics ofdigital electronics . Withthis inform at ion , youshould be able to conduct ala rge nu mber of experi ments, buil d mos t o f thesim pl e-to-m ad era te-d iff i culty digital projects publi shed in this (and other)magaz ines, and even designa few circuits. From here,let me reco m mend that youbegin to study microprocessors and microcomputers .From the rad io amateur'spoint o f view, interfa cing isvery important. .

condition is 0000, then thenex t count wou ld be 0000- 1, or 1111 (it wou ld havebeen 0001 In an upcounter).

We use basi ca lly thesame ci rcui t as before buttoggle each FF from theNOT-Q rather than Q of thepreceding FF . An exampleof a four-bit b inary downcounte r is shown in Fig, 14.Note that the outputs aretaken from the Q outputs ofthe FFs but that toggling isfrom the NOT-Q .

The preset in pu ts of thef l ip-flo ps are connected together to provide a meansto preset the counter to itsin it ia l (i.e., 1111) state. Thi scounter is also called a subtrac tion counter becauseeach input pu lse causes theoutput to decrement byone bit.

A decade version of thisc ircuit is shown in Fig, 14{b).As in the case of the regulardecade counter, a NANDgate is added to the circuitto reset t he counter fol lowing the 10th count. W e detect the sta tes w here outputs C and D are H IGH, andthen clear the two middleFFs. Thi s act ion forces theoutput to 1OO1 l [i.e. 9 ' 0)'The counter t hen deere-

Fig. 15. A co un ter can offer the choice of up and downmodes by adding logic.

eo. III<! - r_ AI:l_ . N.1'.l,...;1

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TO_ .__._.=:''=m.

step up to the best•••

Wi t hou t doubt LR· l is the repeater val ue leader ! Compare i t soutstanding performance with any rep ea ter .• then look ati ts price . LR-I feature s incl ude individual die-cast sh ie ld ingo f recei ver and tra n sm itte r p lus a separa tely shieldedc -steg e rece ive r pre fi lter for peak per formance inharsh Rf environment s · Fron t panel metering o fall vital functions • CW id e n t i f ier • Sym metrichard limiting for clean natural audio • Lowpower MOS con t ro l logic • E.ven thecebtner is included -- just plug in a nd go!The pr ice ? Only $1095 (US amateur clubnet ).

LINKING? The lR- I is also available withcon trol ci rcui t ry for link Transcei ve roperation . Now link repeater si tes wit h thef lexible con trol capability you've alwayswanted,

HIGH rOWER? Our PA-7 5 power ampli fie r is t hec ham pion ! Ruggedly b u ilt to give years of dependableo perat io n in conrtnuous duty repeater serv ice .

•

Mark 3C repeate rs and controlle rs have noequal in performance. Both units featu reauto patc h , re verse e u roparc h . auto dte l. 13M orse messages a nd a total of 39 func

t ions, Both feature micropro cessor contro land bo t h have been proven in the field from icy

Alaska to tro p ica l Brazil. A Mark 3C supercomrollercan make any repeater a super performer , The Mark

3CR repeate r is in a class by itself. I t combines superblyd esig ned RF ci rcu itry in one handsome packag e. It is

witho ut doubt t he w or ld' s m o st advanced re peater!

~See Li st 01 Advertise,s on page 130 73 Magazine • November, 1982 55

Kenneth D. \\:y.m W AtoTTY

51( l lectron;cs10672 Woodbury Rd.Gi.lrden Grove (A 9264j

The Money-MakerPower Supply

Need 12 vo lts for your transceiver? Save half the cost o f acommercial unit by assembling this 25-Amp monster.

,

The completed 13.8-voJr. 25-Amp supply includes overvoltage protection.56 73Magarine . November, 1982

Since the advent of solidstate transceivers. there

has been the need for a simple high-current t z-voltpower supply. The powersupply desc ribed in this article wil l produce 13,8 vo ltsat up to 2S Amps cont inu-

ous d uty. All the pa rtsshould be read ily available.

First of all , you will needto determine how muchcurrent your transceive rdraws, and at what voltage .Look up t he current draindur ing transmit in your

owner's manual. For a 100Watt rad io , this may beabout 20 Amps. Most transceivers. whether they besmall two-meter radio s orlarge mu ltiband 100-WattHFones, will have a vo ltagerating of 13.8 volts. Thisseems to be an industrystandard . Thus, if you wereto build a 12-vol t supply,you probably wou ld notac h ieve t he fu ll ra tedpower ou tput .

Once the voltage andmaximum current a re determined, you may choose atra nsfo rme r. If it is notpo ssible to find o ne ofthe proper rat ings locally,then try requesting catalogs from t he fo llowingthree companies . They a llseem to have a la rge stoc kof t ra nsfo rmers at goodprices.

e De lta ElectronicsPO Box 2Amesbury MA 01913(617)-388-4705

,e Fair Radio Sales Co.PO Bo x 1105lima O H 45802(419)-227-6573

e Mesh naPO Box 62lynn MA 01904(617)-595.2275

A m inimum of 13.3 voltsrms must be supplied to thefilter for a regulated output of 13 ,8 volts. This isequal to the desired outputvoltage plus five volts divided by 1 .414 The cu rrent rating, of course, must begreater than or equa l to thedesired output current. Inmy case, the required cu rrent was 22 Amps at 13.8vo lts. Thus, the tran sformershould have a cu rren t rat ingof at least 22 Amps and thesecondary rms voltageshould be at feast 13.3 volts(13 .8 + 5lJ1 .414. I chose,from the Meshna catalog, a15-volt, 15-Amp autotransformer , The stock numberwas T-658 and the price waseight dollars . I bought twoof them to put in paral le lfo r a total of 30 Amps .Meshna prov ides instructions to convert these autotransfo rmers to regulartra nsfo rmers. This just invo lves rewiring of the attac hed termina l board.

While you are lookingthrough the catalogs, keepan eye out for some highcurrent rect if ie rs, large heatsinks for both the rect ifie rsand t he pass transisto rs,and some " c o m p u t e r-

O... ER·.Oc '.GE" ROH CTIO"

Fig. 2. Schematic diagram of the transform er sec tion. Thetransformers are ra ted 15 volts at 15 Amps.

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with the switch. Note thatsince there is nothing co nne cted to the filte r capacitor termi na ls to bleed offthe voltage stored there, itmight be wise to connect a1ooe-Obm, 1/2-Wa tt resistorac ross the term ina ls beforeco nt inuing. Turn the poweroff and use your voltmeterto ve ri fy that the voltage isnea r ze ro.

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aga inst the sc he m a t ic .Make sure that the switch isoff and pl ug the line cordinto the wall socke t. Beca re fu l of a ny prim ar ytransformer co nnec tio ns a sthere will be 117 V ac t he re.Connect a voltmete r set onthe 50-volt sc a le to the filterc a pa c it o r te rmina ls andturn the power on. Youshould measure an un loaded voltage of about 15 voltstimes 1.414- = 21,2 volts de. Voltage Regula tor Ci rcuitRecord you r voltage re~~- Now start co nstruc tio ning, as we will be us ing of the vol tage-regu lator cirit fo r so me power calcu- cuit. See Fig . 3. Mount thela tions la ter . Make sure t he l M31 7 re gul a to r to theO n-Off switch works and chassis using a sma ll TO-3tha t the p ilot light works heat sink. Use some silicone

73Magazine • November,l982 57

Fig. 1. Block diagram of the complete po wer supply. Eachsection is discussed separately. There are three options fo rthe overvottege protection circuit.

Fig. 3. Schematic d iagram of the voltage regula to r. R1 canbe 200 to 250 Ohms. All resistors are rated at 1/2 Wart. (3 isa ceramic and Col is electrol ytic. Both should be mounted asclose to VR1 as possible.

protection c ircuit, but youmust be very ca refu l ofshort c ircuits. It is possibleto lose the supp ly and t heradio with o ne mistake!

Transformer Circuit

The tran sformer ci rcu itconsists of the line cord,fu se, pilot lamp, t ransforme r, re ct ifiers, and filterca paci to r. See Fig. 2. Getyou rself a heavy-du ty li neco rd for this power supplyas you may be drawing 3 to4 Amps on the transfo rmerprimary. A t hree-wire cordis preferred and the greenor grou nd wire shou ld beconnected to the powersupply chass is.

Use a 5- to t o-Am p fusefor the primary ci rc uit and asma ll neon lamp wit h bui ltin series resisto r for the pilot lam p. I used a key lockfor the O n-Off switc h to prevent "unautho rized" use.

First, mount and wire thetransformer(s) and line cordto the chassis. Connect theswitch, pilot lamp, and fuseto the pr ima ry c ircuit. Thenmou nt the rectifiers to therectif ie r hea t s ink a ndmount the assembly nearthe seconda ry side of thetra nsfo rme r. Use a t leastnumbe r 12 or, better, number 10 house wiring to wirea ll the seconda ry circ uits,recti fie rs, a nd pass transisto rs. The rec t ifie rs musthave m ica insu lators soth e y w on 't sho r t o u tthro ugh t he heat si nk . Also,a layer of silicone thermalgrease shou ld be appliedbetween the recti fi e rs a ndthe heat sink. Ex tra greaseshould be wiped off afterthe rec t ifiers a re bolteddow n, The rect ifiers willhave a voltage d rop ofabout one volt at 25 Amps,so the power they must di s,sipate will be : 1 volt t imes25 Amps at a 50% duty cycle = 12.5 Watts each.Make sure the hea t si nk is alarge o ne.

Next, mount the filter capacitorfs). Use heavy ga ugewire for the capac tto rls),too. Now, recheck all wiri ng

Ci rcu it Description

The ci rcuit is a full-wavebridge rec tif ier with a linearregulator. See Fig. 1. Thevoltage regulator consistsof an lM31 7 wh ich pro-vides base dr ive for the passtransistors . The lM317 is anadju stable th ree-te rmina lvo ltage regulator that whensupplied with 27 volts o n itsinput can provide an adjustab le 1 .2-t0--25 volts at 1.5Amps. In th is case, we willbe inputting 15 volts times1.414 or 21 .2 volts (pea k)from t he rec t ifie r/f ilte rcombina tion, The regulatoroutput voltage must be 13.8volts plus the base-emitterdrop of the pass tra nsistors.This will be 13.8 vo lts + 0]volts, or 14 5 volt s.

Three pass transistors a reused and they share the output current equa lly. Thereare seve ra l options for overvoltage pro t e c t ion andthese wil l be discussed to-wards the end.

grade" capaci to rs, See thepa rts list fo r the values . Also, please note that in mostcases, the va lues in thi spower supply are not verycritical. As long as they areclose, they sho uld work.Most of the sma lle r partsa re avai lab le a t RadioShack. In these cases, thepart num bers are shown asRS numbers,

Circuit Bloch

Each sect ion in the blockdiagram will now be de-scribed. When doing the actual construction, bui ld oneblock at a t ime and te st it asyou go. This will save de-bugging time and may prevent bu rned out pa rts. Bu ildthem in th is o rder:

1) Power transformer, rectifiers, f il ter capac itors, and117-V ac input c ircuit.

2) Voltage-regulator ci rcu it(LM317J.

3) Pass-transistor circu it.

4) Output-p rotection ci rcuit.

Note that the power su pply can be used wit hout any

,

." ..

Output-Protect ion Circuit

It is surprising how manycommercia l power supplies,including those of variousham manufacturers. do notincorporate some form ofovervoltage circuit. The fol lowi ng are three optionsthat will work. All use so memethod of sens ing an ove rvoltage cond ition and thenclamping or " shorting" thepower supply output, thusblowing a high-cu rrent fu se .

The first and sim plest opt ion is to use a zene r dioded irectl y across the o utput.See Fig . 5. Choose a zenervoltage of about two vo ltsover the norma l power supply vo ltage . The current rating should be greater thanthat of the power supply so

probab ly have to combineseveral resi stors to get oneof these). Connect a voltmeter ac ross this load resistor.Turn the voltage contro l tomin imum. Stand back andturn the power on! If allgoes well. you should see avoltage of about 10 volts . Ifyo u a re us ing a load resistorof 1 Ohm, then it is drawing10 volts/1 O hm = 10 Am ps .Try adjusting the voltageco ntrol and record the m inim um and maximum vol tages . These limits shouldbracket the requi red 13.8vo lts , Make sure that themaximum power suppl yvoltage will not exceed thetr ip-po int of the overvoltage protection circuit . Otherwise, it will t rip and youwill lose a fu se . If youchoose not to insta ll a protection c ircuit. you may losea radio!

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and mount t he transistorsusing mica insulato rs andsilicone grease. Be sure todrill holes in the chassis forthe wires to the tra ns istors.Use rubber grommets,

To de te rm ine the maximum power di ssipat ion ofthe pass trans istors, you willneed the unloaded voltageyou measured across thefilt er capacitor. Take thisvoltage and su btract 13.8volts. Then multiply this byone third of the total outputcurrent. In my case, thepower dissipa ted in eachtr an sistor was (21.2 voltsminus 13.8 volts) times (22Amps!3 ) = 54 .3 Watts .Make sure that the heatsinks a re large enough todissipate th is much heat. Ifo und that a finned hea tsink of about 3" times 4"times 2" was alright.

After the trans istors aremounted to the chass is,connect al l the bases togethe r and run a wi re fromthere to the voltage-regu lator output. Small gaugewire is OK . Connect twoO.1.Qhm, 5-Watt resistors inparal le l and solde r one endof th is to one of the emitters. Connect the other fourresistors likewise . Finish therest of the pass-transistorsec tio ns using 10- or 12gauge wire fo r the emitterand collecto r ter minals, theconnect ions to the filtercapacitors, and to the o utput terminals of the powersupply.

Verify all wiring completed so fa r an d t hen connect a 1- or z-Ohm. 200Watt res istor across thepower supply output (you' ll

Fig. 7. Option 3 overvol tage protection circuit. Th is versionhas an adius table vo ltage-limit point.

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positive terminal of thefilter capacitor . Make surethat the nega tive termina lof the filt er capacitor isgrounded to the chass is.

Tempora ril y connect a1Q. to 5Q.Ohm, ro-wanresisto r across the voltageregulator output to act as aload . Connect a vol tmete racross this load resisto r andset the voltage contro l tothe midway point. Turn onthe power and verify thatyou are getti ng about 11 to1 7 volts as the voltage-co ntro l pot is ad justed . If theoutput does not vary withthe control , double-checkthe wiring to the lM317.

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Fig. 5. Option 1 overvoftage protection circuit.

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grease and be sure to use amica insu lator because theregu lated output voltage isconnected to the case. Todetermine the power d issipation of this regulator,take the unloaded voltagereading you took earlierand subt ract 14.5 vo lts .Then mu ltip ly by 1 .5 Amps.In my case, the power dissipated was: (21 .2 volts minus14 .5 volts) times 1 .5 Amps= 10 Watts . The heat sinkmust be la rge enough to dissipate this powe r.

Mount the vol tage control pot o n the top or thefront of the chassis . Finishwirins the regulator circuitusing point-to-point methods . Here , you can use Pass Transistor Circuitsmal le r gauge wire since If everything is OK so far,the highest cu rrent will only the next step is to mountbe 1 .5 Amps. Now connect the pass transistors. See Fig.the regulator input to the 4. Use la rge T0-3 heat sinks58 73 Magazine · November, 1982

Fig. 4. Schematic diagram of the pass transistor section.

,' .0..PO "ER Su PPcyOU TP UTI

MEMORY BACK-UPAND HIGH SPEED PRINTER OUTPUT·

Never Lose Your Memory Again!All "Here-is" memories, ID's and all keyboard input parameters are retained for 2 weeks by the internal Ni-Cad battery & charging circuit. Load upthe memories, carry the ACT-1 out to your field-daysite and be ready to go as if you never turned itoff ! Also included in th is option package is thehigh speed code converted RS-232 serial printeroutput.

The best gets better at MICROLOG Corp.18713 Mooney Dr., Gaithersburg, MD 20879Tel. 301-258-8400 TELEX 908153.

MICROLOGINNOVA TORS IN DIGITAL COMMUNICATION

• SIMPLE DiRECT CONNECTION to yourTransceiver.• COMPLETE SYSTEM, built-inDemodulator & AFSK Modulator with keyboard programmable tone pairs from 500 to3000 Hz. • SPLIT-SCREEN operation withkeyboard selectable line location • 1400character text buffer. • TEN, 40 CHAR. programmable message memories (doubles withBAn. BACKUP), plus ID's WRU & SELCALs.• RANDOM CODE generator & hand key input for practice. • Baudot 60 to 132WPM . • ASCII 110 & 300 baud. • SYNCLOG MODE for improved ASCII operation.• RECORDER INTERFACE for "BRAG-TAPE" or recording off-the-air.• CODECONVERTED printer output in Baudot orASCII .• SSTV/GRAPHICS transm it.• FULL 63 KEY Computer grade keyboard.

·9 - monitor $199. Battery Backup & RS232 print $125.

ApproximateCost

$ 5.00$ .39$ .69$ 3.59$ 4.50$ 2.19$ 5.97s .69$ 1.00$ .19$ 1.00$ 1.49$16.00

MeshnaRS272.()135RS272·1055RS2n1022MeshnaRS272.()706RS276--2020RS271.()135MeshnaRS271.()()25MeshnaRS275·0603Meshna

Buy at

AS272·101 6 s 0.79RS272.()131 s 0.29

just con trol s may be placedanywhere out o f the way. Ifyou plan to use thi s supp lyin a dedica ted applicat ion,the controls, once set. maybe left alone .

If you will be using thesup ply a t va rious vo ltageleve ls. I wou ld suggest option 1 or 2 for your protection ci rcuit. That way, therewill be less chance to misadjust the ove rvoltage control and, consequently, lessc hance of blown fuses.

50, enjoy you r new power supply and. at the sa metime. o bse rve norm al precautions w hile using itshigh-c u rrent c apab ilities.Also. if you have a wellstocked junk supply, justthi nk how mu c h you wi llha ve saved over a commercial supp ly! If you havea ny questions. please sendan SASE fo r a reply. Havefun!_

RS271.()()()9 $ 0.19

RS271·0023 s 0.19RS271.()()()9 $ 0.19

RS272-Q131 s 0.29

Option 3 Parts

Option 2 Parts

Conclusion

This com ple tes t he construc tio n of the basic powe r supply. If you wis h, youmay add a vo ltmete r and anammeter. Yo u a lso may wishto make a nd install a cove rto dress up the c hassis .

The voltage ad just andovervoltage-protection ad-

ad just control fro m maximum to minimum a nd thenback to m a ximu m . Thela mp shou ld rema in o ff. Ifso, a ll is well . Note tha t toturn off the lamp it is necessary to reset the SCR bymomentaril y turning off t hepowe r supp ly. When thecrowbar is adjusted correctly. remove the la mp and reconnec t the anode of theSCR back to the po sitiveoutput. Now, when theovervoltage rea c hes thetrip-point, the SCR will tu rno n a nd blow the fuse.

0.01 "F10 V. 400 mW zener (l N061A)5().1(X! v. 16 A SeR (2N665. 2Nl844. 2N4441 )l oa-Ohm poten tiometer47 Ohms. 1/2 W

100 " F, 35 V0.01 "F15 V, 400 mW zener (l N965A)5Q.100 V, 16 A SeR (2N665, 2N1S44, 2N4441)1000 Ohms, 112 W47 Ohms. 1/2 W

Parts List

16 V or 17 V, 50 W zener (l N3315)

Item

34,800 ",F, 50 Vea., or equiv.0.1 ",F1 .F4700 fo' F, 25 Vl Nl185,150V.35 AmpNeon lamp wrsenes resi stor2N3055 or equivalent200 to 240 Ohms, 2 Wtooo-omn potentiometer1.5k, 112 Wn.t-onm. 3 W, or equivalentSPST sw itch, 5 A contacts15 V, 15 A tran sformer or equivalent

Option 1 Parts

1

2,t11

,21111

C9, Cl0CRl05R12R1 3

CR5

C6C7, C8CRO0 4RIORll

Item Oty.

cr.C2 2C3 1C4 1C5 ,CR1·4 4051 ,Ql·03 3Rl tR2 1R3 1R4-R9 0

5' ,Tl , T2 2

zene r vo ltage ra ting upwards. To test this ci rcuit.b reak the connection between the a node of the SCRa nd the posi t ive outputline . Inse rt a 12-vo lt lamp inseries as shown. Adjust thevoltage control for ma ximu m voltage a nd adjust theovervoltage control to maximum (wipe r al l the waytoward the ground e nd).

Turn o n the power supply. The test lamp shouldbe off . Sta rt tu rning theove rvo ltage cont rol un tilthe lamp just tu rns on. Nowturn the co ntro l about 1/8to 1/4 turn back in the o the rdi rec tio n. This w il l add asm a ll buffer zone. Thelamp sho uld still be on.Now tu rn the power supplyoff a nd then on aga in. Thela mp should stay off . If thelamp is st ill on, try the adjustment agai n.

Try tu rning the voltage-

The seco nd option is a lsono t adjustable. It is an SCR(silicon-contro lled rec tifie r)crowbar circuit . This ci rcuitwas published by Tom lawrence W B4QlW in 73 Magazine, August. 1977 . This isthe one I used for my powersupply because it is fa irlysimple and the pa rts arereadily a va ila ble . See Fig. 6.

Here is how it works: Asthe power supply outputstarts to inc rease from normal and reaches the zenervoltage, the zener will sta rtto conduct c urrent. Thiscurrent wil l produce a vol tage drop across the 1000Ohm resistor and trigger thegate of the 5CR. When theSCR becomes triggered . itwill latch on and sho rt thepower-supply output, thusblowing the fuse . It is rea llynot necessa ry to heat-sinkthe 5CR since the sho rtedcondition will last o nly aslong as it takes fo r the fuseto open. Make sure that themaximum adjustable output voltage is less tha n thezene r vol tage rat ing.

The thi rd a nd last optionis sim ila r to the previous except that the c rowbar voltage is ad justable. See Fig. 7.This circuit was publishedby Joel Eschman n K9MlDin 73 Magazine, Augus t.1979

The o pe ra t io n is thesame, except the trip-poi ntcan be adjusted from the,60 73Magazine . November.1962

the fuse , rather tha n thezener. will b low. The cu rrent rating of the fuseshould be between thepower supply output cu rrent and the zener c urrentrating. For example, for thispower supp ly, choose a 25Amp fuse and a 16- o r 17volt. SQ.-Watt zener.

The disadvantage of th isci rcu it is that it is no t adjustabl e a nd there stil l ma ybe a chance that the zenerwill b low first before thefuse. This wilt st ill p rotectyou r rad io , because whenzeners fail , they usuallystay shorted and this will red uce t he overvoltage tonea r zero.

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73Magazine • November,1 982 61

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62 73Magazine · November, 1982

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73 Magazine • November, 1982 63

TVRO Q & A: Part IIILNAs are expensive, but rolling your own

is a losing proposition.

W ill/he open-end LNA workwith no feedhorn ?

Yes. it will . You can takethe com mon commercia llNA wi th the open mouthand omi t the teedhom. thisworks exceptionally well fora 3 to cl .4 dish. Now, if yougo m uch larger than a .45 or.5 dish. where they're flatter,then you 'l l w ant some sortof a f unneli ng device o n thef ront of your horn such as asquare-flanged horn or afunne l to create a more di rectional beam from the fo ca l point to the d ish.

20% of the l N A cost is m atenals and the rest is labor,much of which is becau se adesign engineer or a m icrow ave en gineer ha s to cit andtune the LNA for p roperspec if icat ions. This is extremely expensive at thera te of pay for eng ineers.The common laborer on aconstruction test bed is notable to bring a low-noise amp l ifier to speci f ications bysim p ly plugging in the transistor. so ld e- ring i t down.and shipp ing it out. It hasto be tuned with p recisein struments. The pri ces aredro pping now, however, andthey have come dow n almost two-thirds in the last3 years.

wo uld have to pu t on forcolor p ictures. W ell, you' retrying about the same thingwhen building an LN A .

\.-\'hat is the most misunderstood thing about buildingan LNA ?

That it is much li ke HFwork or the o ld tube workcl ear back into the f i i t ies.w here you cou ld sim ply in sert a tube or transistor andtu rn the mach ine on to see itrun. GaAsFETs have a verycrit ical l C react ive compone nt to their nature, and ifthese parameters are notm et the t rans istor will no tperform. M eeting these pa rameters is diff icu lt andtakes a lo t of time and meti cu lous wo rk . There arepeop le w ho cla im that theycan throw transistors into astr ip l ine design and learnthe recipe for creati ng a lownoi se ampl ifier. In somecases thi s does work . But asa general ru le, the misconcept io n is that vou can put ittogether, turn it on, and itw i ll run for you . I have neverseen this f irst try, f irst servesituation.

W hy are LNAs so expensive?Prof it is one rea son, bu t in

past years they've been extremely expensive because

m anufa c ture rs ha ve in sta lled ba nd pass filte ring tonarrow down the amount ofoutside no ise that cou ldcom e in. We don' t wa nt thew hole wo rld wal k i ngthrough the LN A . We wouldlike to ampl ify the TYROfrequencies excl usivel y .

Sho uld I buy or build anLNA?

I rec ommend that youbuy your f irst l N A . I've seenon ly 10% of the peop le whot ry to const ruc t an l N A actually succeed and buildsometh ing that is worth having. The d isasters are ho rri b le, so if you bu i ld an lNA,do it after you have boughtone. Buy one, put your svstern up, get it ru nning. andthen go back and const ructa low -no ise am pl i f ie r foryour own use and education. Then you can sell yourcom merc ia l l N A for thesame price you paid for it .

/\l 'n Rae \ \B"f'OP7.J7 South (/,If/..,onOt'n\('f (0 80406

Ho w hard is it to build anLNA ?

An ana logy wou ld be ifIs the LNA 's band w idth im- you went down and gotoonsm! p la te-gl ass sheets and tried

A few years back It w as to grind your own zoom lenssaid that the bandwidth of for a 35mm camera. You canmany lNAs wa s too w ide just imagine the prec isionf o r T V RO ap p lica tion . required to do this and toSince then most of the add opt ica l coat ing that you


Are all 120-degree LNAs thesame?

No, they are not. Somemanufa ct urers meet thespecif ications by just a barernargm. a nd other manufacturers give you a l00-degreeLNA vet ca ll it a 120-degreelNA because it' s sort of astepping st o ne; you buye ither a 100 or 120. Then'art' some indica t ions thatmanufactu rers will includea 105-degree LNA as a stepin progre ssion of degreesKelvin.

W hat is the purposeof an LNA?

l he purpose of an l NA isto amplify the signa l col lected by the feedhom (app roxi m a tel y 4 microvolt s)to a usable level wit houtadding anv appreciablenorse.

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\Vhat is a scalar horn?A scala r horn is simply an

rf choke that keeps the signal f rom going over the outside of the waveguide orfeed horn and traveling backout toward the satel lite. Italso represents a so rt o f vagiantenna; a scalar horn 's ribsre-radiate the wave towardthe center of the waveguide,acting as an elec t rical funnel that catches and shovesthe wave into the mouth of

\-Vhy use a horn instead of ad ipole?

The d ipole by itself doesnot have the gain W hat youare t rying to do is focus thewaves onto the probe in therear of the waveguide. Thisgathering of the waves is extre me ly va luab le w henyou 're work ing w ith smallsignal levels of TVRO

single-mod e operatio n .Hence the squa re wavegu ide is heavil y used inmi litary and commercialapplications.

Circular waveguides col lect an equal amoun t of Eand H fi elds, these beingperpendicular to each other.That is, when the wave enters the dish, the E and Hf ield s are perpendicu lar.The Efi eld is the elect rostatic f ield and the H fi eld is themagnetic field; therefore, ingetting the maximum powert ransfer, you must have anequal amount of these twopropert ies.

The ci rcu la r waveguidemore readily matches theconf igu ration of the ci rcula rparabol ic dish, the sphericald ish. and also th e wavefron tyou are trying to receive.The ci rcular waveguide istherefore more receptive tothe incoming wave than thesquare waveguide. In summation, the ci rcular waveguide outdoes the squarewaveguide by approximately 1 to 1 .5 dB. However. thetransit ion th at you use maycause a loss of .5 to 1 dB, soyou may not gain anythingby going from ci rcular tosqua re, depending on howwel l your tra nsition works.

Do wavegu ide flanges haveto be airtight?

The only reason that youwou ld need an airtight orsealt ight fl ange betweenwavegu ide joints is to makesure that you don't interferewith another system, If youhave a high-power osci l latorfeeding down one of thesewaveguides or if you werereceiving side interferencefrom te rrest rial m icrowaveor something of this nature,then airti ght f langes areneeded. At the low level ofsignal that we are talkingabout, the normal , compressed , bolted -togetherwavegu ides are extremelyefficient. The amount ofenhancement gained bygoldplat ing. seal ing, soldering, and shi m m ing t heflanges is near ly usel ess.M o isture seepage or airseepage might be anotherconsideration if you' re having condensat ion problemsinside your waveguide, butmost waveguides are open.My waveguide is open andhas been for three years.

How much gain is necessaryfor a "perfect" picture?

For a pe rfect picture,something in the neighborhood of 30-36 dB is usua llyneeded , The l NA outputmust be suff ic iently strongto drive the mixer stage. Themixer diodes, if not drivenproperly, will add apprec iable noi se to the system. Thisdic tates abou t 33-<:1 8 mini mum.

W hy do some peop le usero und horns and others usesquare horns?

A long time ago it was un derstood that you get aneasier imped ance matchand less loss with a squa rehorn. I' m not sure whetherthat is true, but square hornsdo have one distinguishingfactor; The pick-up probeand the impedance matching tend to be cons istent in

built waveguides that I'veused and I can see no d if ference whether I leavethem open or cover them.

What is a dc block and is itrea tly needed?

Yes, most of the commercial LNA manufactu rers require that the dc power forthe lNA be fed through thecoax from the center conductor- this being a plus15to a plus 28 vol ts in some appl ic at ions, In order to putthe de onto the coax goingup to the LNA and at thesame time have the rf f romthe LNA com ing down thatcoax, you must divorce thetwo from each other at themixer. A de block is simply acapacitor, usually in theneighborhood of 1000 pF, inserted into the signal pathallowing the rf to go throughbut keeping the dc on theLNA side of the st rip line. Anrf choke in the neighborhood of 5,6 or 10 millihenries is used to divorce the rffrom the dc bias line thatcomes from the house. Thisenables you to have just onecable go ing to the LNA.

more predominant duringthe day than at night due tothe fact that telephone traff ic is a lot heavier during theday. The deviat ion is higherdue to the volume of FMtraffic that is coming out ofthe terrestrial interfe ring signal and deviates fur ther intothe video po rtion of theband of the particular channel that you 're watc hingThere fore, you'l l notice theinterference is heavier during the day than it is at nightIf around 9 or 11 o'clock atnight. when telephone volume drops off , the TV getsmore and more clear, thenyou can suspect that youhave terrest rial microwaveinterference. and I would golook for it with a spec t rumanalyzer at that point.

M y LNA works a/l right atnight, but is very noisy during the day; why ;s that?

It sounds li ke you have aheat problem inside the LNAwhere the chip capacitor isseparating and/or closingdue to the heat and expansion of the circuit ry , Nor mally the day and night transit ion is not noticeable on aTV screen un less you 're ave ry par ticula r person andsee more sparklies duringthe day than you do at night.But if th is is the case, irsusually due to the temperatu re of the l NA. and its circu itry is fai li ng duri ng theday. The other type of inter ference that comes duringthe day is unassociated withtemperature, l ight , or cond itions of the sunspot cyc les ,The satellite noi se fi gure isdue to its position rela tive Do holes in the wavegu ideto the sun on its recetv- hurt anything?ing antennas and whether It depends on how largeit 's chargi ng its batteri es the hol es are, If they're noor not. And al l these pa ram - larger than one-e ighth toeters influence noise dur- one-quarter inch, they don'ting the day, have very much effect if

One of the biggest clues there are only one or two into terrest rial interference is the waveguide. I have quitethe fact that it's usua lly a few hol es in the home-

66 73 Magazine . November,1 982

Is a 6O-d8 LNA berrer than a30-d8 LNA ?

No, I wou ldn 't say so, notin natural use if the mixer iswithin the vicinity of thelow-noise amplifie r Ifyou 're going to put yourmixer inside the house andrun 60-80 feet of coax o rheliax to the mixer, then youneed some extra dBs fromyour lNA and gain to pumpthe signal down the coax,but in effect they' re equal inqu ality, A lot of people willthink a 6O-dB gain is betterthan a 30-dB gain , As fa r asthe noise level goes, that isestablis hed by the fi rst transistor amp l ifier o f t heGaAsFET lNA, and therefore stages added behind itdo not improve the noisef igure, They improve theability of the low-noise amplifier to push the rf fu rtherdown the coax without get ting bac k down to an unworkab le level at the otherend of the coax.

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73 Magazine - N ovember,1 982 67

I ,...-------,

,-

the wa veguide. The scala rhorn applies most readi ly toa deep d ish-low focal dist ance-to-d iameter rat io(FlO). The horn must " look"at a wider a ng le. The funnel shaped horns a re more d irec tiona l and a re used witha flat dish.

W hy is the sphericaf-dishhorn so much larger?

The foca l po int of asphe rica l dish is quit e a lon gdistance from the surf ace ofthe ref lecti ng sphe rica l andtherefore a large r a rea ha sto be ga the red in. It is as ifyou are traveling 12, 14, oreven 32 feet away from thesphe rica l an tenna to catc ht h e m ic rowav e s ig na l.You're sort of li ke a catche rin a baseball ga me; youwa nt to use a large glove toca tc h tha t little ball . The fur the r away you are, the mored irectio na l you want yourview of the antenna. Therefore, the broader the ho rn is,the na rrower the beam is. Soyou want to catch this na r-

row beam, mak ing the hornappea r much la rger tn physica l size. The diameter of themouth is muc h broade r thanfor a parabolic d ish

W hat horn do you use on a3-FID dish?

On a .3 you wou ld use awide-a ngle horn such as asawed-off wa ve gu ide , asawed-off piece of 2-inchpipe, o r a rectangular commercia l 229 waveguide. Thewa ves spread ve ry rapid ly asthey leave the mouth of thehorn. This leads us to usethe sca la r horn as the bestchoice.

ts a gold- or sitver-otetedhorn better than a copperone?

Gold or silver is bette r.but for al l the cost of havi ngthe gold plat ing o r the silverplating done, you will probably increase the signa l on lya tenth of a d B. So it's costprohibit ive to do this typeo f th ing.

Are there any surplus horns?" Surplus" is not real ly the

word because you can go toa ny plumbing sho p and finda 2-inch d iamete r ci rc u la rpiece of downspout coppertu b ing - a nd that is yo ur"surpl us" waveguide. Thereare squ a re and rectangularwaveguides. An abundanceof them are being th rownout every month by AT& Tinto sc ra p ya rds w he rethey' re sold for scra p copper. (They knock off thebrass fitti ngs on the ends ofthe flange s fo r b rass sc rep.)There are pro bab ly tons ofthis lying a rou nd a ll over theUnited States.

How thick should the wallso f the horn be?

Thick enough to with stand abuse suc h as fromdropp ing it or from wildweather . In mounting It, youmight bane into it. so youdon't want it to distort readily wit h nor ma l hand ling.Something like 24-gauge or28--gauge co ppe r is the thin-

nest you should use to makeit rigid

Can you use PC material forthe horn I

I don 't li ke to use PCboard materi al because yousolde r to o nly one side at atime, leaving on ly th in co ppe r to hold the corners toge the r. Bracing it o n the outside takes extra work suchas putti ng brackets a round itto hold It togethe r. Ge ne ra lly speaking it will work reasona bly wel l, a lthough 1think t here 's easie r materialto work with.

\-Vhere can f buy a horn'That, I wouldn't know.

Most ho rns can be builtreadi ly out of sheet coppe rd rawn out on the kitche n table, cut with a pair of tinsnips, folded, and solderedtogether, just as you wouldfold up ca rdboa rd to make abox fo r Christmas wrapping.Most of the amateu r ent hus iast s co ns t ruct t he irown ho rns._

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73 Magazine . November, 1982 69

•

The Sound of SilenceBeep!! Your T5-180 is off the air, Charlie.

«

Tony Ruepp HB9BL U/fang!;!,. 73CH·fH53 RuemlangSwitl erland

T he T5·180 contains avery effective SWT pro

tect ion ci rcuit . If ever theSWT exceeds a given limit.t h is ci rcui t immed iate lycuts off you r transmissiona nd li ghts the LED. Thisstate is held until you (o rthe VO X) release the transmit button.

Whe n tra nsm itt ing CWo Ivery seldom watch the rig. Irather "see" the letters andwords passing by while sta ring at a ho le in the ai r. Several times I did not reali zemy transmi ssion had been

cut off, but I learned it immediately when I returnedto receive and heard mypartner in a no the r QSOwondering where 1 m ighthave gone. My 40m a ndBOm antennas swing in thewind and o ften exceed thesw r li mi t fo r a moment.

The following very simple modi fication gua ra ntees gaining your immediate atte ntion wheneve r theprotection ci rcu it has fired ,It simp ly stea ls the sidetonea nd even recycl es the protection ci rcuit if you' re ope rating in the VOX mode.It's a n easy job to do (ta kesabout 15 m inutes a nd costsle ss th an a do llar) if you fo llow the instructions carefu ll y,

Prepare a diode (1 N4148or equ iva lent) a nd a pieceof insu lated wire (leng thabout 50 em). Strip o ne e nda nd pre-t in it .

1 ) Re m o v e t he e ig h tsc rews wh ic h secure the topcover.

2) lift the cover slightlya nd un plug the speaker.

3) Remove the cover ent ire ly.

4) Lo ca te the protectionci rcuit LED above the digita l frequency displ a y. ThisLED is mounted o n the LE Dunit. The leftmost pin on itis labe led PRL and a bluewire is soldered to it .

5) Make sure no othe rwires a re to uc hing that pin,the n so lde r the preparedwire to it.

6) Be nd the wire 1.5 c m

behind the pin to the left.Bend it to the rea r agai n after another 3 c m a nd followthe edge of the Pll assembly to the rea r of the rig .

7) Bend it to the rightaga in a nd cut it 2 cm fromthe CW ke y jack.

8) Strip V. cm a nd tin it.9) Now caref ully place

the wire in its proper pos ition a nd ta pe it close to itse nd to the c hass is.

10) The CW ke y jack has5 solde ring lugs. Loca te theo ne with the brown wi re.(This wire leads to the STSpins of the i-f assemblv.l

11) Solder the a node ofthe diode to the lug wit h thebrown wire a nd the ca thode(ring) to the added wire .

Th is completes the mod ificat ion. •

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Build the Re-FuserIt's a self-rep lacing fuse.

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SC R2 may be used to activa te a small osci lla tor,e .g.. a Sonalertt or othertype. This modula tor can bemade to signa l, via a n rf carrier, tha t the main fu se hasfailed and that t he system isin the back up cond ition.

places F2 in the ma in loadline. If the load now iscapab le of proper operation, F2 will hold , restoringthe eq uipment to se rvice .The TO heate r is aga insho rt-ci rcuited, so it rese ts.

The modulating sys te mmay be a periodic beep or acont inuous tone. The Sonalert device can give loca la u ra l no ti ce , as we ll a sprov id ing e lectrica l mod ula tio n.

A re la y a rrangeme ntm ight a lso be e mp loyed ,with the relay coi l ac rossthe ma in fuse .•

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This a rt icle desc ribes aci rcuit which wil l detec t theopen-fuse cond itio n, givethe load and/or supp ly timeto re cover, re p la ce t heopen fuse with a good one,and a nnounce the fact tha tthe re serve fu se is now inse rvice.

re

Fig. 1. Dc-operated circuitry.

Fig. 1 shows the genera lc ircuit for a de-poweredu nit. So long as the regularfuse, F1 , is good, the heatere lement of the tim e-de laydevice is sho rted ou t by it.Should F1 open, the heaterappea rs in se ries with theload . After a delay periodfor the the rmal device toope rate, the TD switc h contacts close and power is a pplied to the ga tes of SC Rs 1and 2. SCR1 cond uc ts and

•

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Th" ", ,,,,, ' M leot.., """'", ••• <Ie"~"" ,,, 0 ,1,. ' ''." 0' 01" " ..HW. 1tO"""'",. 'n, Pa5 '0 d " II .... '.....~ T.. 0"" " ,. ' 100 "' ~_ ' "<1' ""-.c ' '" ' _ "" ,.,. -.c' __-., ,.... , .., """""'... lI'_OCO ..... _'" _'31_ 70_ ,_".,,, .,.""OI~, OOO oa~_ 01 0 "" • •~ Two f'OQuencies t .ailable

P.C. ELECTRONICS 2522 Paxson Lene.Tom W60RG Mary.nn WB6YSS Arcadia. Caillornia 91006

·TXAS. PAS, FMAS and lye B asic Module "kg.

C.II or wnt. tor our compl.tellsl ot specihcations. statHJll set-up (I,ag,ams, andoptional accesso, ies wh'ch Inciude antennas. mOdulato.s, deteclors, testgeneratOrs. cameras, etc. WE ARE A FULL·lINE SUPPLIER OF ALL YOUR ATVNEEDS.TERMS, VISA 0< MASTERCARD by telepl'lOne or mail, 0< check 0' money order Dymeil. All p<lces a.e deli_ ood in lJSA_Allow uvee "'eelo. s alte< o<de< 10< deli,ery

(2 13) 447·4565 Charge c ard o r d er s o nly

TVC·2 ATV DOWNCONVERTER.. , . $55 ppdSI" o"ne MRFlIO l l U db .. r, p,.amp . M OOuo'e b.'-e<>olOO "' .. .. mocl "'e d,g. """". . ... "" bu ' ,e. ,. ,.," , ..""",• • "" 0 ...'000<1 C<o<l_,•...t 0", ent..,_no."'" Tv .., '0"",,, to ch.',.... ~ ... 3 " .."'... 'unn' 20 10 .'>(1 ",t<, ""u",,, • t210 ' . _. 20 "'"s..- .....,',... lVi;·a . " n .. e6olloJej ....."'p, "'" " ".,- --

72 73 MagaZine • November, 1982 Reed.r s"rvice for Ilclng pige ...24---

'A!SU.....

Ml M 2 M 3 SCAN

' 0 0 AM4 M 5 M 6 ..

oM

"c9

M9

MW

MB

MO

B

* 0 l( t% 0

M 7

(2)SET

lOC K SPJ OPl fAfQ ClK

[neg .. Inc.!1000 A"'CI'"IlH: G..... eooPlano TX 7S014

P1c_.end me......-e . IIoo" ",oon 8bOUIo The ST-I 44 .,.pOAuthonzcd VJ'jT[( [)Calcrs

SANTEe

STATE ' ,'"",---YOU -.YSIND A DUl'l.lCAn OF THIS fObo..

•

No Smoking in the Ham ShackOvervo ltage kills solid-state finals. Protect yours for $1.00.

,

NEWRADIO ACTIVITY925 South NinthLanderWyoming 82520 _,...~..... ...ve.h • F--

./

.r:

LOCATION.... 315

john J. lap/Mm, Ir. N7JJ4718 18th NtSeattle WA 9810'>

This two- or three-cornponent addition to a

power supply will give theexperimenter a visual indication of an over-voltage

condit ion and do it for muchless tha n the cost of a meter(see Fig. 1). All that is r~

quired is a low-power zenerdiode. an LED, and (possibly) a low-wattage resistor.

For example. in Fig. 1, theunregulated voltage is 18vo lts. Si nce a voltage-regu-

lato r fail ure could occur ifthere were a collector-emi tter short, there conceivablycould be 18 volts at the power supply output. Supposethe load can' t safe ly operateat that potentia l for verylong. By choosing the rightzener , t he expe r imen ter can have an inexpensivev isual ind icat ion of th iscondition . The mathematicsare simple!

Rem ember Ohm's Law ?E= IR. Fo r this example, azene r is chosen which wil lreduce the 18 volts by the1.5 to 1.7 volts which areused to turn on the LED:Vl~n." = 18-1 .7 = 16.3volts. In a normal outputvo ltage co nd i t io n, t hezener wil l not conduct andthe LED wi ll not tu rn on,but if the output rises to thebreakdown value plus theLE D conduction value, theLED w ill l ight. But supposeyou don 't have (in this case)

V...... (.....~ T. D · ,evee .,~ ) ,..

t f fOI

Fig. 1. R1, ZD1, and LED1comprise the monitor c ircui t.

a 16-vo lt zener. Maybe youonly have a 13-vo lt zener .What then?

Well . 18V - (13 V + 1.7V) = 3.3 V. What is going todrop that 3.3 volts? Remember that resistor? Now youcan use it. The resistancemust equa l tha t 3.3 vo ltsdivided by t he c u r ren tthrough the conductingLED, in thi s .case .02 Amperes. Using Ohm's Law weget: R = Ell, or R = 3.3volts l-02 Amps - 165O hms. This va lue of resista nce i s the n placed inse r ies with the LED andzener to drop the excessvo ltage (see Fig. 2)_

If the voltage is requiredto be mon itored exac t ly,then a meter is the bettercho ice. But if an absoluteover-voltage value is theonly concern, then thi s circuit cou ld be ut ilized foraround $1 _00. It could be abargain. •

'" ..,e,

r 1 l O'l)v

• t ''''Fig. 2. The correct value forRl .

•

74 73 Magazine · November, 1982

An other first fr om AEA . TheWoodpecker Blanker. WB-t reallyworks. This unit effectively blanks thepulsing interference of the RussianWoodpecker. Two versions areavailable, the We·1 for use with communication receivers and WB·1C foruse with all popular transceivers.

I fus extremely useful accessory isdesigned for direct insertion betweenyour receiver (or transceiver) and theantenna. It is both MORE EFFECTIVEthan I.F. type blankers and requiresNO MODIFICATIONS to your receiver!The unit operates from a 13 VDC ± 2VDC power source at less than 575rnA. (AEA AC wall unit AC·l willoperate the btanker.)

The blanker works well on both CWand SSB modes that are being interfered with by a woodpecker. Controis on the front panel include; lourpush button switches. a synchronizecontrol and a width control The WB·'also features a lew-noise untunedbroadbanded 6 db gain pre-amp whichcan be selected with or without theblanker enabled. The WB·' C uses thesame circuitry but includes a carrieroperated relay (COR). This providesprotection to the receiver section duroing transmissions lrom the attachedtransceiver.

For more detai ls. write for our latest catalog orvisit your favorite dealer.

Prices and Specifications subject to changeWIthout renee or Obligation.

Don't Be Left Out in the Coldwith the Russian Wo<Xlpecker

GET AMOSCOW

MUFFLEK™

ADVANCED ELECTRONICAPPLICATIONS, INC. .,P.O. Box C-2160,Lynnwood , WA 96036(206) 775-7373Te le x: 152571 AEA INTL

AEABr ings you theBreakthrough!

board• Work. with anyt y pe nello.

· Complete Tim e rFunction..-

M 100 A 599.00 assembled

INSTANT REPEATERANY BAND ANY MODE/'

· . Channel PROMCW I per

· VOX or CORoperation

At Last! An RTTY Tuning Scope!And who else but HAL would bring you such a practicalsolut ion to the RTIY tuning problem. If all you have isflashing lights. you know how difficult it can be to matchyour transmit frequency with that of a received RTIYsignal. The RS2100 RTIY Scope ends these problemswith an accurate display of the received signal (both signal amplitude and phase). The RS2100 is a matching companion for the CT2100 Communications Terminal andmay be used with most HAL and other manufacturers'RTIY equipment. An internal loop supply is included.

• x-Y tuning scope indication• 1" diameter green phosphor CRT• Front panel focus, intensity. and position controls• Internal 200 VDC. 60 rna loop supply• Two loop keying circuits (h igh voltage or

opt ica l isolator)• 3-1I2"x8.1I4"x 10-3/16", 91bs net, 121bs ship

ping 120/240 VAC, 50/60 Hz power• Scope indicator works with CT2100. DS2050.

DS2000, CWR685, CWR6850, CWR670,CWR6700, ST5000, ST-6K, ST·5K, and more

• Loop supply works with CT2100, DS2050,DS2000, CWR685, and CWR6850

Write or call for more details. See the RS21 00 at yourfavorite HAL dealer.

.., HAL COMMUNICATIONS CORP.BOX 365 .,,,URBANA, ILLINOIS 61801 217·367-7373

PORTAPEATEReS 179 .00 assembledunit

- .= " , K- - .. _ " 1 . '":-

02 !)O ..olt .iIIt'! ~ :.. "" "" "Bulltln T.,.,.wltch ln g , C' • e I; ~ Fuo",Uonacapablll t y -_. PO

:::-~.:n "" RTA PEATER . 20 Page• AD Ina tant T e ehnlca.l Manu-..l

R epea te r (Fully tested. programmed. assembled) .... 302

W-S ENGINEERING P.O. BOX 58. PINE HILL. N.J. 08021(201-852-0269)

KTTYSCOPE

MEW!

Tempo MARSerGet the 5-1 off those crowded ham channels. Expand your

coverage above and below the amateur band.

+

tr/l,on Fon/< WBt>lQNS ',Ilnl'I IO Corpora tion8 11 l A rqu(', A~ enue

Sun nt l'il le f A '1 ..W8 7

Fig. 1. The Tempo 5-1 transceiver.


The Tempo s-i. introduced about two yea rs

ago, remains as one of themost popular V HF synthesized transceivers. This is because of Its compact size,du rab ility. re liab ility, andperf o rmance. Thi s arti clewi ll show that with somesimple mod if ications, the redie's bandwidth can be extended to 140-155 i\-l Hz,thus covering MARS. mobiletelephone. f ire, police, etc.A l though some degradat ionof performance occurs onthe band ext remes, no measurable degradation was obse rved within the amateurband . The few componentsand items needed are li stedin the box

The techniques presentedhe re can be applied to s imilar transceivers suc h a s theIeom IC-2A, but are muchmore complex with microprocessor-co nt ro l radios

such as the Ke nwo od J R24{X) and Santee HT-1200.Alt hough the Unit is capab leo f tran smitting in the co mrrwrcial band after the modrfic etions. only authorizedpersons sho u ld do so, In ad diuon. the modificat ions arenot FCC-a p p ro ved

s-t Background

The block diagram o f theS-l is shown In Fig 2. Themaster o sci llator is in apha se-l o cke d -l oop conf igurat ion so that on ly a singlebase crystal (6.82bb6 MHz)is u sed for the reference oscillato r. Thi s oscillator is fedthrough a p ro gra mm ab le d ivider chip (N IS-103) InitialIy , t h is d iv id er s p a nsN = 800-1bOO, givi ng the $·1144-148-M H z capabilit ies .Fo r example. the followingdivi sions give the divideroutputs and operating fre q uencies sho wn:

Di"isicJIl

r" =0 800

N =0 1000N =0 1200

r" =0 1400S=o lta1

Output(M H z)

' 331 (,(,

2 l1O233266

Frequency

(M H z),,,H I,...,,,,...

_ - 2SC I51~

2S CI0 70

'" .... n"2

'"2 .. ....

2 5C I51 '

ILOC " L OSC10 2 " S2SC'''' ' '

,-.••

~ 'S - I O I

u ...... ~••~2SC200'2S""22SC ,~,

~5A 7"

PwR ' .... p:;C22 2 1 ~_ _ ..._ _ ., _

2SC" "

I

•••~C202 '" t--

2$C 240 7

'.'2 SC2 02...

PROG/ ll lV

I I I I I

PlOtT

•••2SC202"

I

'"~ I S - I O S t-- NIS - IOSt-- ~ ·8011 · '''' 0 0

NIS · ' O'

,~ r-'----,,

Fig. 2. Bfoc/... d iegrem o f the 5-1 .

'AL' "' 'L -I X . ..., _ 2

'"

~I I

CRYSUL., .I'~'---"" es cIi- 2SC16 7 ,.,II

2 5CI 7 6 A 2S. ...,

CD-i ..,C' .... P '----1---...J. P CS17M f

~I'~'".n lf---'!.·

."

Nr S-10J does not directlydivide the reference oscil lator because NIS-l05 contarns o ther c ircu it ry . Theo u tpu t signa l IS then m ixedWIth the ·B.1-M Hz c rysta loscil lator. Ii the output ofthese two signdl ... is summedand IS fed through the vcocons rs tmg of the 2SKb1 andthen tripled via the 25C17&4,the ou tput o f the vco bec-omes 134.30 MHz. The vcogene rat es the sum signal direc tlv produc ing a c lea n signal ilS opposed to lapp ingthe signal ot t the rntver

Fig. J. \\' iring con figuration shO\..·ing the switching of the twocrys tals.

Fig. -I. Schematic of the vco. The only point at which thevaracrcr d iode can be connected is oerween C31 and C30since the dc vottege will not dis turb the circuit.

- -- TO Ill'

c----""

". ' 002SC'6" ".

4:: CI...

.!. ., .!.I"" '""0'

'" " ,1""" r·····,1 '0 0'

220n

, ," .

• r:i TO 08

.I> L ,,,

1 C31OI . F' o w .. ' T OO'L..--- ,,~

",' ,,' 100 -- ..-r't. 220 _ 1",,,. 1m

"

,•

..?

..±"~

25' ''' ".". "'" ."33.F ..

I" '",~.

I~~·F /

, ~

.~ Ino", r" " '0

I,,j.nf '~

,,I TO 0 ' 2

f ig. 5. Hookup o f rhe vsracro r diode and hO\\ it is switched inand ou t of the circuit.

Fig. 6. Mourning of the varactor diode, 0 ', and R1' on therece iver board.

73 Magazine • ncvemoertsez 77

Fig. 7. Four-oosuion switch mounted on the back of the fransmi tter board.

section of the thumbwbeelswit ches with the unit removed from the housing.the three-secti on switch sopora tes casilv. On the sw i tc hfu rthest to the lef t. t here aretwo rubber stoppers. Remove these and repack theSWitch Coverage IS nowa vail ab le f rom 140 -1 1) 0M llz . Because o f the V tH

actor-tuned ci rcui ts in thet ru nsrruner and rece iver.degradation in performance1\ minimal \Vith a dummyload into a Bi rd wattmeter.transmit power IS still 15W atts, and sensit iv ity is belo w 1 uV at t he new bandedges. No degradat io n wasmeasu rable WIthin the amateu r band

Generally spea k ing. thereIS limited act ivity below 144MI Lo', but fro m 141\-1 50 M HIthere is m il itary. M ARS. p tlgmg. and other act ion.

,

Fig. 8. The back o f the franscei..er shO\\-'mg the p lacemenf ofthe DIP switch.

78 73 Magazine · Novem ber, 1982

(2SClb7Sl. which will haveslJunous produc ts within t ill'band of o perat io n. T1w twosign,ds are com pa red bvNIS-l0') and .1 correcnonvoltage is sent back to the\ TO (More on phase-lockedloop techniques can bt> obtamed f rom llovd CardnersPh,l ...('Jod.. f {'chnique.\ , JohnW il eI,' a nd Sons, New YorkN Y, 1% 6 .) The signal is thenfed either 10 the transmitteror rer erver where 10.7 ,\ 1Hzis added on 10 it to obtainthe 144,00 ,\-Uil shown inthe example given above.Fo r t ra nsmu offsets of + bOOkHl . the crysta l is 11 ,3 MHl .and for - 600 k f-iz , thecrystal is 10 .1 M Hz.

Extension to 14().150 MHz

The S-l ca n easi ly he exte nded for operation f rom140·150 MHz with m inimumetfort and no extra components. The programmabilityo f NIS-l 0J is capable ofN = O-20tX) What p reven tsth is act ion is no t tlw t, It'ct ron ics but tilt' mecha nic s.Henrv Radio is obligated toallow the rad io to transmitonly In the amateur band.This I., done by p lac ing rub ber stoppe rs on the MHz

Extending the 5-1 to 155 MHz

xtost people would agreetha t 148-1 'i0 M HI. i,> notwhere the major ac uvitv occ urs H ow ever. f ro m 150·1 'i ,)M H./. . t here are mobi le telt'phone. pagmg. fin-, police.ambulance. and other ecnvmos . A prac tic al met hod o falternat ing the t req uencv isto chan ge the 4J,1-MHz osci l la to r c rys t al (X-2) to46.433 1" ' Hz. Th is crystal willswitch the synthesizer rangeto 150-1bO M Hz with directreadout. Unfortunatelv. thevco is ca pa b le of lock ing upo nly to 15.1 ,00 M HL (Th isl imit wi l l vary from u rut tounit.)

To switch t he two c rvstal sIII and out of the ci rcuit . re mow' X-2 and place II w herethe private li ne [Pl. ] circu it rynorma lly wou ld go. U singKG -1 78 B/U (or RG ·174 ,which is bulk ier). co nnec tone end to the receiverwhile the other end goes tothe two crysta ls (43,1 o r46 .433 MHz). Fo r switc hing.a a-posit ion SPSI DIP sw itchcan be used Since the crysta l is grounded on the otherend. it is best to d isable thecrystal by unground ing it.JIg, 3 shows the wi ring conf igu ra t ion W ith t ilt' new

• u.s. Made· Competitive Price· All Solid State. 12V DC • SWR Protected •• Broadband· No Tune Up • Full Break·in CW • 150 Watts PEP, SSB or CW Input •

• High Dynamic Range· Excellent Sensitivity/Selectivity. Digital Readout •• 160·10 Meters Plus WARC Bands and MARS Coverage·.

Front panel switching allows Independent MODE and optionalcrystal t iller selection.A passive double balanced mixer is employed in the receiverfront end. This stage is preceeoed by a low noise high dynamicrange bipolar rf amplifier to provide good, strong signal pertermance and weak sIgnal sensit ivity.Accurate d igital readout of operating carri er frequency Isdisp layed to 100 Hz.

A rugged, so lid-state PA provides conllnuous duty in SSB andCW modes. A cooling fan (FA7) is avai lable for more demanding duty cycles, such as SSW or AnY. The PA also featu resvery low harmonic and spurious output.VOX GAI N, VOX DELAY, VOX disable, a SK, selectable AGetime constants, All and noise blanker selecnon are frontpanel controlled lor ease of operation.The TR5 is desiQned with modu lar construction techniques loreasy accessibili ty and service.

GENERALFrequency Coverage: 1.8·2.0" , 3.54.0, 7JJ.7.5,10.0·1 0.5, 14.0·14.5, 18.0·18.5 ", 21 .0-21 .5,24.5-25.0",28.0-28.5",28.5-29.0,29.0-29.7" MHz.(· Wlth accessory range crystal).Model of Opefatlon: Usb, Lab, cw.F~ St.blUty: Less than 1 kHz drift l lrsthour. Less than 150 Hz per hour drift after l irsthour. Less than 100 Hz change for a :!: 10% linevoltage change.Re.dout Accuracy; :!: 10 ppm e 100 Hz.P_ Requir.ments: 13.6 v-ee regulated, 2 A.12 to 16 v-ee unregulated, 0.8 V rms maximumripple. 15 A.Dlmenalona:Depth: 12.5 In (31.75 em), excluding knobs andconnectors.Width: 13.6 In. (34.6 em).Height: 4.6 In. (11.7 em) exc lud ing feet .Weight 14 lb. (6.35 kg)

Model 7021 SL300 CW Fil terModel 7022 SL500 CW FilterModel 7027 Sl100Q ATTY Fil terModel 7023 SL180Q ATTY Fil ter

TRANSMITTERPower Input (Nominal): 150 Walls. PEP or CwoLaid Impedl nce: 50 ohm s.Spurious and H.rmonlc Output: Greater than 40db down.Inl~l.tlon Olstonlon: Greater than 30 dBbelow PEP.Carrier Suppression: Greater than 50 dB.Undesired SiOeOInd Suppression: Greater than60 dB at 1 kHz.Duty Cycle:Ssb, Cw: 100%.LocI! Key (wlo FA7 Fen): 30%, 5 minutes max ·Imum transmi t.LocI! Key (w/FA7 Fan): 100% .Microphone Input: High Impedance.Cw Keying: Instantaneous lull bfeak-in, adjustable delay.

ACCESSORIES AVAILABLEModel 7026 SUOOO AM Filt erModel 7024 SL6000 AM FillerModel 1570 PS75 AC Power SupplyModel 1545 AV75 Synthes ized Aemote VFO

RECEIVERSenaltlvlty: Less than 0.5 uV lor 10 dB S + NINexcept less than 1.0 uV, 1.8-2.0 MHz.Selectivi ty: 2.3 kHz min imum at - 6 dB. 4.1 kHzmaximum at - 60 dB (1.8:1 shape factor).Ultlmlte SeHlctlv l1y: Greater than - 95 dB.Age: Lesa than 5 dB output varia t ion for 100 dBInput signal change, referenced to agcthreshold.Intennodul.tlon: (20 kHz or greater spacing) In·tercept Point: Grealer than 0 dBm. Two-ToneDynamic Range: Greater than 85 dB.I·f Frequency: 5.645 MHz.I·f ReJection: 50 dB, minimum.Imlg. ReJection: 60 dB, min imum below 1..MHz. 50 dB, minimum above 1.. MHz.Audio Output 2 watts, minimum 0 less than10% THO (4 ohm Ioacf).5put1ous ResponM: Grea ler than 60 dB down.

Model 1531 MS7 Spea kerModel 1507 CW75 KeyerModel 1558 NB5 Noise BlankerMod el 7017 Microphone

540 sucnaro St., Miamisburg, OhIO 45342. USAPhone: (513) 866-2'21 • Telex: 288-017R. L. DRAKE COMPANY I ~mmmJ. --------------

,

Results

lilt' on gma I s)H' c ii it ,l·IIOIl S or tho S-I Me uncha nge-d In the lo w extreme(1-1-0 ,\ 1HL) sensitivitv is st illIn'lo\\ 1 uv. \\ hi lt' II I 1l) l)

MI17 II \\ ,IS ob..er\t'd to lxI S uv . more- t han ,Ult't! Ud!t·tor movt ,Ippll( ,II 10m, l ilt'vco lost lock at 156 MHz bu lW<l <O extremelv stable below1'j'j .\1 H I Ih lu n ll1g Tb, Iht 'uppe r or 10Wl'( 1r1 '<ILlt'Il("t',ln-'lll t' '> (<I n be t',te ndp<!hut the o \t 'rill l b 'Uld w ldl 1l is,Ibo ll t l'i M il , . On tramlllit ,,11 It'<l.,\ 1 'j \V dt b w <!., aVd il,lbte at all tn·q uencies(Re m e m bt' r A d u m rnv loadIllu.. t bp u ..ed \\ I1('n te.. tll1go n u ncl u thoriz Pd trequt' n (It'~ , ) Whllt' s\vit( hing irolll140 -1 10 1\ 11 1/ to 150-1'iS1\ \ 11 /, tl11' unit mu s t bpIUrllt'd 0 11 while tht' cr\,stal,'> S\\ lldll'd ,md Iht'n turm'do n dgalll Th is I ~ b('cilu,>t'o nce Ihp vco loe,k .. to ,1 {N·

( ,li n irt,t!ut'llcy. it IS dliflcultto brl',lk lock ,lIld reloc k,lJ.;<1 in \\ht 'n th('rt· is ,I 3 -M I IIdllrt'renu' beh H't'n the tw o0"( illator nvstal s

Th.. <lUthor \\ o u ld like toth,lnk Glt·n loth 01 Slg ne l icstor t he phologr,lphs, .

that the po sition of the ho lew ill m at ch the pos ition oitbe swrtch

Usefu l Hints

Becau se the S-l i-, so c o mIM CI. rf tends to feed back111 10 the c nncal we nons o it ht, t r<l n~ ( t' I \ t' r It wav toundthat bvpa...~. C.lP,l( uors (0 1u l' ) install ed in till' supplyleads 111 both tilt' U'Cl' lvt' r.md trancnuuer boards Im pro ved lilt' I'LL vtabduv A'>,. gt'ne rd l rule. d o no t soldertlu- r rv ..t,11 (,1:;(' 10 groundI lu-, ran brook t ilt' ViK UUIll~ ('dl on most (r\'''I ,lls .md'>111 11 it-, tu 'qut' ll( v. and .rttlrlH'" 11111<1\ sl o p 0"( d l<l llng.tlto gethe-r l'IO\\I'\t '(, cla rup .Illg l ilt' <(\ .. tal to grou nd I"

pe-rm.....rhh- and ,.. ret omnu-ndr-d Al-,o. plit ( ing , I

~ht, ( ,t 01 ,111l1l1111l1 111 10 11

around tln- b.un-rv .md thenurounduu; It (,11I11 1l1.lt('., rt

It ,t'db ,l( k mto lilt' touc h 101lt' 1,\1 I',HI

nents is high, Second. theva rac to r d iode mu st be connected to a poi nt where thede voltage is i..elated sincet he d iode mus t be cont rolled by a de voltage. Thesc hema tic tor the vco issho w n in fi g 4 The node between ( 30 and (J1 is th(' only pOUlI at whi ch <1 va ractordiode could be placvd.

1 ht, 1 NS'14H varactor d iode wav chovcn bee.ruse ofits runge. 47 pl (no \,011 ,11-;(')

and 14.7 pi (m in imum val ue], With about tu-volt s reversed b ia s ac rO'>~ II A 120kl1;ll-\\" llt l n -vrvtor W ,b nedto Ve-e 10 n-vervc-bias tlu- diode, An addmonal n-ostermu vt be u -a -d 10 di.,;choHgPthe (bod e when th e vol tagei.. removed Bypass ( ,l p ,K itor ("1 ' wav placed nt',t toRl ' to pre-ve-nt ri mtortor1'11(1 " and Cl· was installodm-vt 10 RT I he fina l coutig

ural ion appears a s show n inFig 5,

In the 150·1S'i -MHL area.tlu- -wrtch I ~ closed. whi chredc« ('" tht' (,'pdCittlllt t' 011

t he va ractcr diode. In tilt'14(J.I ';0 - M H I region. t hesWII< h i<, o pene-d I ht' tw oeddmona l rt·..rstors -houldbe 1 8 -\\'atl to conve- rv e..p ,l( t' , but thi -n- IS room ior1 /4-W .ut r t' s i ~ t o r s , C1 ', 1)1 '.and RI · art' placed dt thebctt om print ed crr cuuboard under the- shield pl a tein p.ualle! Wllh em. as..hO\\ n In 119 h 1hi .. nWlhodis prt'fl'fabk' to tlllr1unin'!(,<ld lIlducl,llltt' IU· dnd Cl'wert ' 1l10untt'd nexl to 53s inn' Its l('<ld induLt dlH"t' ISno t IInport,mt It is rp(-ommpnd t'd Ih'll il treqlll'ncy('Olln te r ilnd rf genf'r,ltor bf'avai lablp so tlMt Tb « m beo p t im iLl' d fo r rn dx im u rnb,mdwidth ,

I h t' uncomlmtl('d .,wl lc ho n the 4-po<,ition DIP sw itc hcan be u sed for su baud ib letone o r tone burst it dp<,iredMounling of Ihl' D IP ..witch.... dOIH' on b,1{'k of lilt' Irammit hoa rd. ,I,> show n in I ig , 7A sq lldre holl' is m ,u k ' o nthe bMk o f t ht' S-1 to iI<{"'SSIhe ..witch, ,1\ ~ho\\ n III Ilg .8 Bp su re to d t'i 1lle tilt' posi ·tion o i the holl' c a re t u lly so

•

1111', is the re a ..o n t or thr-t-oosinon OIP swuc h ratherthan a two-posrnon o ne. Inorder to t'xlend tht' loc kr,mgt' of tlu- VCO, ,I vara rtordiode w a-, incorporated

Some gene ral rules must1)(' c1a riii('d b p lore p ro( I't'd mg to an y phY Si c alrnodliic iltlons , F,r.. t, r",m o vIIlg any ( OlllpOllP n t., is outot the q LH,,>tion . 1hi.. is h t' c a u se lilt' S-1 u"es tlow through ..o ld e r. 1he risk o ida ma gin g o t he r com po-

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is bulky)1- Va racto r diode, l N51482-118-Watt , 220k resistors2-0.1-uF bypass capacitors

The Te mpo & 1 service manual can be obtained from He nryRadio, 2050 S. Bundy Drive, Los Angeles CA 90025, lor $7.50

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pronll .. ing Slludt ion. p"peciilily WIth tht' ne w rept ',Hersubb,md (I nd fm' 'lI1d Id W

enfor(l'nwnt Lwt\v('t'n 15]a nd 1')5 MH/ ,

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80 73 Magazine . Nove mber , 1982

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Mike Richardson N5MR5467 Plantain CircleOrangevale CA 95622

CW and the Apple IIThe simplicity of BASIC plus the speed of machine language

equals a near-perfect Morse keyboard.

Fig. 2.

PI" I E.;>-- - - - - - , - - - - - - - - - -j

utility transistor (10¢ at Radio Shack).

There a re other combinations of parts that workwhich may even be cheaperthan this c ircuit. However,these a re the first o nes I ranacro ss in my junk box, a nd,as the old proverb says, " Ifit works, do n't fix it. "

O ne word of caution: Ifyou use a quad CMO S chip,as I d id, be sure to groundthe inputs to the unusedgates-otherwise the chipmay malfunct io n. Thus, forthe 74C08, you s houl dground pin s 4, 5, 9, 10, 12,and 13.

My Triton IV is an a il-solid-state rig employi ng lowkey ing vol t ages that a2N2222 can handle withease. If your rig uses gridblock keying, a slightly d iffe rent c ircu it sho uld beused- see Fig. 3.

Q2 can be substituted,but sho uld have a Vee greater tha n the keying voltageemployed in you r rig. The2N5401 and the 2N4888 canha nd le up to abou t 300volts.

For a cathode-keyed rig,the ci rcu it in Fig. 4 can beused.

Q5 is a 2N41 23, and Q6 isa high-voltage, high-currentsilicon NPN power transistor s u c h as t he Del c oDTS-801, -802, o r -804.

,

"

TO " EY r" GC ' ~ C U I T ,"T~USC[' V [ ~

L_ < " [ · u0"'

Ul is a single AND gatefrom a 74C08 CMOS quadAN D gate (49¢ at Rad ioShack). Ql is a 2N2222 NPN

d riven by c hip F14 , a74lS259. The Apple manualsuggests buffering this output, and Fig. 2 shows thebuffer in g circuit I used tokey my Ten-Tee Triton IVtransceiver.

Fig. 4.

..210(1 CU"OO

"EY'''G,. OUTPu T,,I u'

• 220011 )"~

)

Q-zs;,•

, " t-;J uo ••

Fig. 3.

P, ,. I

."

"' .. e ,.,.....,.B.~-------J _j

..... re"

PI" I

I next took an ordinary"lb-pin solder-tail DIP Iesocke t (16¢ at James Electro nics) and soldered wiresto p ins 1 , 8, and 15 on it. Iuse this socket as a ma leplug, and plug it into thegame paddle I/O socketwhenever I ge t in the moodfor CW.

Pin 15 is designated output ANO by Apple, and is

... " "' .0 .~,., ...,., ."CQ 4(l sn ."

PIlLO~"

PIlLl PilL'

.~ "LOCU'O~ .'4

Fig. 1.

84 73Magazine . November,1982

•

GA"'E I '0 CO~ ~ ECTO~

TOP v' EwIHOU Eon CO' PC e OU OI

T he re a re many goodp rog rams f loating

around for the Apple I I microcomputer wh ich wi ll le tone t o u c h-t ype Mor secode. However, CW isn'tnea rly as effective comingout of the Apple's itty-bittyspeaker as it is coming outof your antenna. This a rticle descr ibes a very simple(and cheap!) interface forthe Apple which should keymost rigs.

The key to t his interfaceis t he neat lit tle game I/Oconnector that Apple has sothoughtfully included withyour computer. This connector is an ordinary t e-ptnOJ P socket with the layo utshown in Fig. 1 .1

Although there are 16pins on this connector, onlyth ree of them a re neededfor this interface . These a re :pin 1 for + 5 volts, pin 8 forground , and pin 15 as thekeying output.

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FL·2 MULTI-MODEAUDIO FILTER

.-See LiU 0 1 Adverr,sers on page r3Q 73Magazine • November, l 982 85

,

32000 POKE 16002,173: POKE 16003,89 : POKE 16004,1 9232005 POKE 16005,173: POKE 16006,48: POKE 16007,19232010 POKE 16008,136: POKE 16009,208: POKE 16010.532015 POKE 16011 ,206: POKE 16012,1 29: POKE 16013,6232020 POKE 16014,240: POKE 1601 5,9 : POKE 16016,20232025 POKE 16017,208: POKE 16018,245: POKE 16019,17432030 POKE 16020,128: POKE 16021,62 : POKE 16022,7632035 POKE 16023,133: POKE 16024,62 : POKE 16025,17332040 POKE 16026,88 : POKE 16027,192: POKE 16028,9632050 RETURN

Fig. 7. BASIC subrou tine for POKEing machine-languagesubroutine into memory at locat ion 16002 (hex $3( 82).

6 GOSUB 320007 POKE - 16296,0

10 HIMEM: 15999199 REM-MORSETYPER MAIN PROGRAM200 GET K$220 P = ASC(KS)225 REM-PRINTS lETIER TO BE SENT ON SCREEN230 PRINT CHRS(P);240 GOSUB 1000250 REM-ADDS SPACE AFTER EACH LETIER260 FOR Q = 1 TOSP ;NEXTQ300 GO TO 200

999 REM-MORSE SENDING SUBROUTINE1000 L = LEN( A$( P))1005 FOR I = 1 TO L1010 R$ = MID$( A$(P) , I , 1)101 5 IF R$ = " 1" THEN GOSUB 12001020 IF R$ = " 3" THEN GOSUB 13001025 NEXT I1030 RETURN1199 REM-oIT SUBROUTINE1200 POKE 16000, PP: POKE 16001 ,X : CALL 160021201 FOR l = 1 TO X : NEXT L1202 RETURN1299 REM-DAH SUBROUTI NE1300 POKE 16000,PP : POKE 16001 , T : CALL 160021301 FOR L = 1 TO X : NEXT L1302 RETURN

Fig. 5. BASIC listing.

Well, that's it in a nutshell . If anyone has anyproblems, send me an SASEand I'll t ry to hel p.•

LDA SC059LOA SC030DEYBNE 53E90DEC S3E81BEQ sasssDEXBNE $3E88lOX S3E8OJMP $3E85LOA SC058RTS

Fig. 6.

AD 59 COAD 30 CO88DO 05CE 81 3EF0 09CADO F5AE 80 3E4C 85 3EAD 58 CO60

3E823E853E883E893E8B3E8E3E903E913E933E963E993E9C

References

1. Apple If Reference Manual,January, 1978, p. 25.2. The Radio Ama teur's Handbook, ARRL, 1977, p. 364·5.

Notice that the fi rst statement in the assembly-language program IS LOA$C059, w hich sets the gameI/O output AND to 5 volts.W hen the code element hasall been sent, the programbranches to $3E99 wherethe command LDA $C058 isgiven, whi ch resets ANO tozero vo lts befo re returningto the main BASIC program .

Fig. 7 shows a BASIC li sting which wi ll POKE themachine-language subroutine in Fig. 6 into memory atlocat ion 16002 (hex $3E82).One of the fi rst statementsin my main BASIC programcall s this subroutine beforeany other action is taken bythe program.

The connoisseur of key- mand, wh ich stops sounding ci rcu its may find the lat- ing the code element.te r two of these ci rcu its As a fina l example. he revery fami liar. They are bor- are a few details from myrowed from Jim Garrett's own CW program, which is(WB4VVF) excel lent article based on "The Morse Mason the Accukever.' ter," 7J Magazine, January.

Well, so much for the 1979, p. 114. A BASIC li stinghardware end-the rest is of the pertinent parts of myfree ! (I spent 75C; for parts program is shown in Fig. 5.for my interface. Add an ex- The Morse code is held intra buck o r two if you r rig an array A$(Pl. where 35req uires one of the latter stand tor dahs and 1s standtwo c ircuits.) The only thing for dits . As each letter isremaining is to add state- typed on the App le key-rnents to your CW program board, t he correspond ingwhich wil l te ll it to turn the value In the array IS re-AND output on and off at turned . Fo r example, whenthe rig ht times C is pressed, the value 3131

By POK Eing a 0 into loca- is returned from t he array .tion - 16296 (hex $C058). The subroutine at 1000 thenAND is set to zero volts. pee ls off the dig its one byConversely, by PO KEing a D one from the left. If a 3 isinto me mo ry location present. the da h subrout ine- 16295 (hex $C059). AND is at 1300 is selected . I f a 1 isswitc hed to + 5 volts. present, the dit subroutine

at 1200 is selec ted .CW programs can vary My dit and dah subrou-

greatly, but probably all of t ines are almost identical .them, whether written In

They each cal l the sameBA SIC, assembly language,machine-language subrouor machine language, willtine at memory locat ion

have one su brout ine to 16002. This subrouti ne issend a d it and another sub- listed in machine and as-routine to send a dah. If

semblv form in Fig. 6. Inyour program is in BASIC, hex, 16002 IS written asthen the statement POKE- 16296, 0 should be added $JE82.

This mac hine-languageto your program as the firststa te ment in both the dit- prog ram is almost identicalform ing and dah-forrning to the tone-generator pro-subro ut ines. Likewise, add gram shown on pages 43-45t he st a t ement PO K E of the App le Reference

M anual , Each time before it- 16295,0 as the last state-ment In each subroutine. is called, two values must

be POKEd into memory.Also, it is a good idea to addthe statement POKE The first IS variable PP.

which determines the fre-16296, 0 as one of thequencv of the output tone

first statements in your pro- through the speaker. Thi sgram, so that output AND

can be any number bewill be init ialized to zerotween 0 and 255 (I prefer 96)

volts each time the pro- and this number is POKEdgram IS run. I

int o memory oc ati onIf your dit- and dah-form- 16000 (hex $3E80). The see-

ing subrout ines are in as- ond number requi red by these rn blv o r machine la n- subrout ine tell s i t how longguage. the following com- the code element should beme nds wi lt work. Insert the sent. In the dit subrouti ne,command : this is va riable X, and, in theAD 59 CO LOA $C059 dah subrou tine, I used van-imm edia tely before the able T. This second numbercommand wh ich starts the is PO KEd in to memory 10-code element sou nd ing. cation 16001 ($3E81 hex). (Ilikew ise, insert use X = 10 and T = 40 for aAD 58 CO LOA $C058 code speed of about 30immed iately after the com- wpm.)


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Tit,,. I " P'o'n.ion. ' ..Co,., .... ,(:•• , G'ldl " Units -Onrg"e" '0' E. " e ,.,e £n"'O/lm'",s f - JO 10 .. 60 - C~

All equipment nsembled & t.sled. For 2M, 220 MHz & 450 MHz!

SPEC COMM REPEATER BOARDS (, SUB-ASSEMBLIESSCR2QO •SeR 450BOARD

SCR200 VHF R.cel".r Boerd• TOII"y H,. Ad.eltCH 0.1/0111I ' POll Front e n" F it . .. .. 'dl d~n.m;(:

""ge-'educes 0"0'e<1oad . spurIOUS ReIP. &11,1, '

• Sens OJ uVl12dS SINAD IYD• Sel ~B @ :t 6 5KHz -lJOllB • :t 30KHZ. (8

Pole Crysl ll .. . Pole C, .,mlt Fll rs• '5 Mel e. " Discr iminator & DeVIa t ion Mtr, Out

pUll!I h e . ludro QUIllly ' Fn t sQ...elch! ",!o ,l)O()5%

Crys ta. f"Su~ Sharp '· IF Fir' a lso a ••"/

SCR200 R.celver Anembly"SCR200 _leel ln ahl. 'd. d '-'e'n;• Com O'e lely n m Dld & tUled , "'IF T. c . Os,

50239 conn

• As ...sed In I~e SeR 1000 Rea dy to d 'op >~to yo" ,s , s te m ' H igh Reco mmended'

SCR4SO UHF R.celver Bd. or Any.• Simile, to SCR200, ".c. pt . 2\:he70 MHl

APCM Bosrd• Used ",ISCAP boa'd 10 plo.,de "' Re v",' " Palch"

anO l a"lll ''''' ConT'Ql 0 1~l>P.'e '

• tnch,I(leS ' .nO I•..., a nS* l!" ,nQ c", .... t"

"fO' sca.r occ 0' SCR .~

~.AapI .C" DarlingTon P... T, -101 ,mprovtld

\\~}! ,." O""ySCAP Autopateh Board ~ . 'ncludM ove<"tQlla;e ·· CrOWI)ar·' ~I·

• Pt_ a U bea'c ....tQPllICIl l...ncllOfll 00-" eec rt. Secu ,e 3 [)jgil Access. I A.... QtK)t1 l" ncl lOfl , • Cornplete ' ,1. w asse m bled PC boa'd $19 50

Aud'O AGC; B...'lt·ln llmerl . etc. Bea...h lu l A...d,O ' • S3 50 s~,pp,ng flandl,ng

" 011 InhiDlt tid , . '1lO .vail. ble• W,it,ic.1l101 det.lls ,nd. d.t a sheel

ID250 CW ID .. Audio Mixer BCMrd• -. 111.... 1.00e 10 lone , spNO, _ I. I,m'ng CYC la,,_ Inpul -.f M... , • loc. ' "" C amp

• COR '''Pu l & .m" 1\010 C"C"" !!• C"'OS 'QQ" . PRO'" memory-15O D'1 . IC",n nal• LIp to _ d 'n.....1 10 chan".•• 'a Many OIfle' leal ...'e5 Fac lo,y P'O'\I'ammed

COItfItfIJNICATIONS... ~jee llS I 01 A"vefllsers on page 130 73 Magazine • November, 1982 89

,Allan S. Joffe WJKBM1005 Twining RoadDresher PI\ 19025

Everyman's Audio AmplifierMake this one-chip amp a permanent part of your test bench.

It's an easy project for beginning experimenters,

Fig. 1. Schematic of the general·purpose, one- Ie audioamplifier.

Motivat ion seems to bea com bi nation of

ished product is shown inFig . 1. The externa l partscount is low and non-exotic.The supply voltage range iswide enough to make it gofrom any small supply thatyou have around the bench,and it works "carside" quitewell , running off a cablethat goes into the cigarettelighter. The series RC netwo rk connected to pin 7 isthe gain set.

As shown. there is amplegain to get a fair amount ofnoise out of the averagemike. The volume controlallows the handl ing of agood range of input levels,making it handy for manybench chores.•

together when my audiosignal t racer died its finaltime, died when I needed tocheck a mike that someonesaid "does n't sound like itused to."

I have long ago learnednot to ignore good advice insmall packages that comeover the local repeate r. Theava il abi lity was provided byan Ie. a Toshiba TA7205Pthat had been pu rchasedfrom Digita l Research, agood source of supply that Ifirst met through 73. Thecharm it held for me is thatits pins will fit into one sidecf a standa rd 2o-pin DIPsocket.

The diagram of the fi n-

" £TAL".J"TOS".UTA 7? OSP

•,

. " TO "v

C

need, circumstance, andavai labi lity. These all came

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• Frequency accuracy, %.1 Hz maximum - 40·C to + 85·C• Frequencies to 250 Hz available o n spec ial order.• Con t inuous tone

8UAST TONE S:1600 1850 2150 24001650 1900 2200 24501700 1950 2250 25001750 2000 2300 25501800 2100 2350

TOUCH·TONES:697 1209n o 1336852 14n941 1633

TEST·TONES:600

'000'50021752805

TE·12PB

TE·12PA

67 .0 XZ 85 .4 VA 103.51 A 127.3 3A 156.7 5A 192.8 7A71.9XA 88 .5 V8 107.21 8 131 .838 162.2 58 203.5 Ml74.4WA 91.5ZZ 110.92Z 136.54Z 161.96ZnOX 8 94 .8ZA 114.82A 141.3 4A 173.86A79.1 S P 91.4Z8 118.8 28 148.248 119.96882 .5VZ 1OO.01Z 123.03Z 151.45Z 186.27Z

• Frequency accuracy, %1 Hz maximum - 40·C to +85·C• Tone length approximately 300 ms. May be lengthened,

shortened or eliminated by changing value of res istor

~ "

rd'/COMMUNICATIONS SPECIALISTS426 West Taft Avenue, Orange. California 92667(800) 854-Q547/California: (714)998-3021

Stuck with a problem?OurTE·12P Encoder might be just the solution to pull

you out of a sticky situation. Need a different cresstone for each channel in a multi-channel Publ ic SafetySystem? How about customer access to multiple repeater sites on the same channel? Or use It to generateany of the twelve tones for EMS use. Also, it can be usedto access Amateur repeaters or just as a piece of versatlle test equipment. Any of the cress tones may beaccessed wIth the TE·12PA, any of the audible frequencies with the TE-12PB. Just set a dip switch, no testequipment Is required. As usual, we're a stickler forl day delivery with a fu l11 year warranty.

• Outputrevet flat to within 1.5db over entire range selected.• Immune to RF.• Powered by 6030vdc, unregulated at 8 rna.• Low impedance, low d istort ion, adjustab le alnewave output,

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Su iIt -in 115 VA C supply. 6 .,..5. 2 'I, TwO·l one Q'@Y slyhnllE,en laleSi 'iO' inc lude o nly . fraCl ion of !he QF·1A

sele cll,'ly Ye t II ~ook . up on m,nules to ANY 'i,--Ya" . " ,Kenwood . D..~e, Swan. Alias. Tem po. Heal n, Colhn•. Ten_Tee , etc. JUS! lOlug It 'n to your pl'>o"" jle>. InO connect sp l"or phones to the output JOIn the tl>ou sand ~ 01 o wn,,'s whono w hea' .tal,"'" they could,' l cDCIY w.lhOU l iI a F· lA' II'eilily ..or~.'

Probably ll>e moll popular ·'pro ln .iona!"' conte . t key",in use, yltl mo.1 o....ner. a'e ca .ual CW o pera tor. or no..ices. Art", a te.... m, nu t" s. you ' lI He ho.... memory r....oh,ftlQfl 'l'" you' CW opera t'''''! Just steet sending a nd recordyour CO, nlrne, OTH. etc. in secOfl<JI , l02a bit. 510''''a!>out 100 charac te ' . (Ietle,s. nU"' berlll. Playback a t anyspeed, Dotldun memories, trigge'ed c lock, r"peal , com·bine, 5 to SO .. WPM, bu ,lt ·in monltOI aM 115 VAC .upply.Works .... 'th any paddle, Si t back and ' el.. .... niie you' MK·1calls CO and handies standard exchangeS!

Optional memory e xpander (ME·11 e .pandS s ny MK' l to400 cha"cters, ME· j lac to ry instilled $35. O.... ne r In·stalled. only $21 ( .. $4). Add more memory no .... Dr ta tarl

NO LONG DELAYS. WE SHIP 95% OFORDERS FROM STOCK

We sell on ly flctory d rrect. No de" l", markup in au' pric".Ortl"r ....ilh c hec k, M.O., VISA. MC. Add'" pol tl g. a M h"n.d ling ln all .,.,es.(17 lor UPS .'r). Add $7 to Can..:l a, HI.,Ak. Add S22 el_I'I'Ir. , sh ,ppe<l . If). Add 5% tax in Fl•.

Audlil'Y Nolen ... F our m l ln l il t . ,Jectl 80 10 11.000 Hzl rr><>dq lor I ny QRMC_ 1'0 ""'1 ot"-. 1111I.lion.nolckft Cl n ', 100000h.

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$100.50 1+$4)Model MK·1 Keyer $104.50

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73Magazine • novemoertasz 93

•

01 J.W. Miller Division ~ ""BELL INDUSTRIES19070 ReyesAve. • P.O. Box 5825

i Compton, california 90224. flI (213) 537-5200 . TWX 911).346-6740

Automatic Antenna TunerModel CNA·l00lFrequency Range: 3.5-30MHz (Includ ing

WAACBands)Power Rating : 500 Watts PEPInternal Dummy Load: 50 WattsJl MinuteImpedance Matching : 15-250 Ohms 10 50

Ohms ResistiveInput Power Required lor Automatic Tune : 1, 5

or 10Watts (set by rear panel switch)Tune-up Time: 45 Seconds Max.Power Requirement: 13.8 VDC/.2 AmpWrite lor complete specificat ions

•

RTTV/C .For theTRS-BO

• General Communication• Industry• Marine VHF• Scanners• Ama teur Bands• CB Standard• CB$pecial• MJCfoprocessor

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ROM·116Now inc ludes :-TEXT EDITING- RTTY PICTURES-SAVE TEXT TO DISK Detailed brochure available on request.

...See LI$I of Advem sers on page 130

I

Robert w Baker ~\BZCfl

15 ~\! indsor D,jH:-A/co NJ (J8()(N

•

Award-Winning ProgramCertificate hunters, cut your paperwork down to size. Let your

Pet track your quest for excellence.

H e re 's a simple programfor the Pe t that was

designed to keep track ofwhat states ha ve beenwo rked on wha t bands fo rS£lWAS. For each state, theprogram re co rds the callsign of the station workedon each band (80. ~O, 20, 15,and 10 meters). You can di splay the e nt ries, just the totals for one pa rt ic ular ba nd ,or the tota ls for all ba nd s

combined (mixed ), The datais sto re d in a data file o ncassette tape and takesabout two minutes to load ,save, o r verify. The prog rama lso provides a way ofc ha ng ing or de leting a nyentry, if required ,

The program was writtento be flexible e nough that itcou ld be used for othera wards record s suc h asWorked All Zones (WAZ) o r

Worked All Cont inents(W AC), To change the program for another award .simply modi fy the values inlines 180-200 as req ui red :

AWS= The a-tetter award name(WAS, WAZ, WAC, etc.)

HE = The number of entries lorthe award-must be 50 or lessdue to the current Pet displaylimitations. roNAS = 50, WAZ. =40, WAC = 6, etc.)

IES= Entry input question used

in line 770:For WAZ you could use:IE$ = " ZONE (01.40)" .For WAC you could use:IE$ = " CONTINENT (NA, SA,EU, AF, AS. OC)"

KS = The st ring 01 entry nameseach 2 characters long:For WAZ you would use:190 KS = "010203 20" ,200 K$ = K$ + ..212223.. ....40".For WAC you would use:190 K$ = " NASAEUAFASOC"200 (deleted- not used!)

Program lis ting.

~"!o'l~.il f H HT.. .. lltSH'1 1 • OO Tf1Jl 1flf'E ''550 Ol<EtlI,1 1," II" T"' .. f-F lln" .TIl>ITI"r, [", m'·%0 FOP 11 . 11(, I'E , ~ I!I1 'l ,I, " , Il ' U[,:T'570 " FIH T":lO" ~" H; 's"',,n . . . .. 0010 z-e

""sse ~'E II VE" I F~' [\fiT" Ctl T"'f'E lOll " MEII;00619 FPI"T· IlI'rSEn ' , 100;1 • TOtfE TO VU ' I FY"';''9 (If'lH j I 0 RiOI '·.1oI<T" · FPIHT ·· ..."EHF ... Ii4(, ~T"' -

6:e FOf' 1+01 TO liE It<f\l Tll . C' IF 5T... AND O · II" H, THE" >ExT~ IF ST-';4 ""ill ' '"f€ THE" f1=·I ..T- :lO" T!1f'E 1oI<T" ~PIFTED ... . OOTO 278sse IF C' (:I"'Ii' TNEII f'f' I,n ':l:>1l""TM .. IS - ....TC.. '· 00102;"0';';0 Pl' I HT":l:rrfoft: FE"" 01= DI" "" SI - · , ST (,(ITO e-e6 ,11sse ~EM IHlT l f<l IZ E o'IL L EIIff'IES

'":'00 f'PI HT" OI: LE"· I Il(. ALL EliTP I£S ' ·7Ie POl> H-I TO HE [ "H ' - £f ' £f . £f ' Ef . Ef 'lE;.cl1.<0 Wlln " " {ifoli', I .. ITI .... I;:ED ••• . IL. I (,OT O 2~1l

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f'O£EPT II. II'" EP, l<1I2(ofEI ~ IIIHDSOl" ilf' 1~'l

"Teo . HEll JE'-,E'" 08004

100 ~'EM . . .... ~,£w'fE.-~·H (tP~S ..... ..110 ~EM

120 ~EM £...1)0 ~H1

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94 73Magazine • novemeer. tsaz

- •

O nce these three lineshave been changed. the restof the program should nothave to be mod if ied .

The remainder of the program is very st raightforward Line 220 ensu res thatthe Pet is in the uppercase/g ra phics mo de an ddefines the da ta (0 $) andtota ls (T) ar ray ') along withthe blank entry va lue ( ~$ ).

Lines 2bO-340 display theprogram " m enu" wh ich <11lows the user to selec t Ilwdost red p rogra m func t ionfrom those available. Lines350-380 get the number ofthe desired function andchec k that ,I val id selecnonwa s 01,1(1" . Lint ,.., 400 4 20t hen bran c h t o the routineto perform the selectedfunction. but tht' data muvtfu st be Imli,lliLed or loade-dfrom ta pe before anv otherfunction ran be perfo rnu -dI his e n<;ure" that the d.rt amatrix (D$) has been setcor rectly before attemptingto use any val ues containedwithin It , I ach o f the avai l -

able functions is then performed by one of the rou t ines in the rem ainder o i theprogram

The first time you use theprogram. initialize the datato c lear all entries. Then enter each catlsign f or the ap p ro pr iate QSO o n ea chb and fo r each sta te. Youmake the ent ries by f irstspec if y ing the s ta te to beente red If you hit" RETURN" Without makingan ent rv. the program w il lret u rn to the men u "p lpc tion If the sta te is notfound (incorrect 2 -l e tt e rcode). you will be asked,lgain ior the band (RO, 40,20, 15. or 10 meters} If" IU TURN " is en tered with ou t any d ata. vou w ill be.hkNl tor the sta te agam Iian Incorrect band is en te-n-d , vou will be asked tort Ilt' band ,lgalrl ,

w hen d correct sta te ,lilt!ba nd haw' been entered.the current entrv for thatst,l tp and band WIl l be dlSpl a ved Ii vou e nt e r

" RETU RN " without anydata, the current entry wil lbe unch anged and Vall w i llbe asked fo r the next stat e.If YOLI enter a " 0" fo llow edby " RETURN", the currentent ry Will be deleted {setback to penods). Any otherdata en tered follow ed bv" R ~ TURN" is assu med tobe the c allsig n to beentered for that slate onthat band If th t> call "lgn IS

longer than 10 characters.you wi ll have to reent er therallsign . A l l callsig ns entered Will have period" apponded to make them 10characters long before thcvan- stored. The five call.,igns for eac h stdtp arcstored to get her as o neSu-character vtn ng to ." IVenu-rnorv vpace

whe-n all entnes havebeen m ade. (hsp lay theda ta on Pil ch band andc-hec k if cor rect If requi red.go back and make any correctionv You ,11"0 can d isp lay the total ... and checkior tlu- correct number of

states on each band. Beforesto ppi ng the progra m,m ake sure that you vave theda ta on tape. It's also agood idea to take the ext ratime to verify the data file,to make sure it was correctly saved. You m ight evenw ant to save more than onecopy on tape whil e Vallhave evervthing m memory.Now vou simply load theo ld data file the next tunevou want to add, co r rect. o rt-xarrunv anvttung If vouma ke any changes. don 'tforget to save the new dataon tape t or those whowant 10 go even furtherwnh their award records.you could ke-ep separateda ta f i les for each mode(SSB. CWoRTTY. SSTV. etc.).

10 an vwer the cue-nonbefore It'S a-ked. tor anv0Ilt' too I,vv to tvpe In tht'p rogr,lI11 , 1·11 be happy tosupplv copies on tape for$2 no e a ch Howeve r ,

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1.1'1/11' l"AN1' ~"'All';11I'"r J"t,,,r IJ;,fferJY 1·;It)/{s

.....See List 01 Ad.errisers on page 130 73 Magaz ine • November,1982 101

Speed DemonHow fast was that? Find out with this wpm disp lay

for Heath 's 1410 keyer.

60 H'

- -'

line frequency as shown(fi rst by 6, then aga in by 6,then by 2, then finally by 2;see Fig. 2) we obtain a'l.Z-second gating pu lse. Wenow have the means to timethe keyer clock pulses for1 .2 seconds and the countwil l u p d a t e each 1 .2seconds. The reset pulseclears t he counters 0.6seconds prior to the counting interval. Se nd dotsand/or dashes fo r over 2.4seconds, and the readoutwill dis play for 0,6 secondsthe speed at which thekever is set.

Power, the 6Q-Hz line frequency, and, of cou rse, thekeye r clock pulses are alltaken from the keyer. Refe rto Fig. 3 and the Heath 1410keve r manual for the tol-

,------;:==,.,--

,:==l-2SECONDS,:==::. 12 C1CLES -

,c. PoN S

<C' P,N 6

' CZ PO N 6

instead of the dots, the formula becomes:

words/min =1.2 clock pu lses/sec

Multi p lying the c lockpu lses/sec by 1.2 is thesame as me asu ring thecloc k p ul ses for 1 . 2seconds. 1.2 seconds is 72cycles at the 60-Hz powerline freq uency; therefore, ifwe count the clock pulsesfor 72 cycles of t he line frequency, we are effective lymu ltiplying ou r keye r clockpulses/sec by 1.2. Thus, bycounti ng the clock pu lsesfro m t he keve r fo r 1 .2seconds, we can read thecode speed direct ly o n theseven-segment d isplays .

Refe rring to the timi ngdi agram in Fig. 1, we seethat by div iding the 6O-Hz

First, let's look at whatwe need to calculate thewords-per-minute speed ofthe keye r. The ARRL Handbook gives the followingform u la fo r calcu lat ingcode speed :words/min = dots/min!25 =

2.4 X dots/secFrom the Heath 1410

kever manua l, we see thatfor each dot generated(space inc luded), the clockin the kever generates twopulses . The clock pulse rateis tw ice the do t rate. If wemeasu re the clock pulses

••

Jerry Wayne Campbell K4ZHMRre.4, Box 126 BarkleyNicholilsville kY 40356

I n the follow ing, I w ill describe a d igita l disp lay I

added to my Heath 1410kever to display the wpmsetting of the kever. Thesame principle can be applied to other kevers .

' C4 PIN . : GATE,,

IC5 PIN 3 :~ESET,,

The assembled keyer with the counter modification.


Fig. 1. Timing pulses appearing a t various points in the circuit.

T C1109 RCA

" .... " ..TC1 500 RCA

The completed counter board before mounting in tne keyer.

The counter board is mounted using right-angle brecxetsand the mounting holes for the removed paddles.

removed the kever paddlesfrom t he kever and took outt he center post. I t henm ounted a red lens over theo pe ning. The d isp lay andci rcuit ry are then mo un tedbehind the lens using them ount ings for t he removedpadd le assembly.•

(212) 646-6300 (800) 221-0860TELEX: 235135 ..... 92

COMMUNICATIONS, Inc.2115 AVENUE X,BROOKLYN. N.Y. 11235

CALL CECO'S VIDEO DEPT.FOR OUR LOW, LOW PRICES

Dealer Inquiries Invited

T h e r e ar e sev e ra lm etho ds of housing thed ispl ay. I use a Bencherpadd le w ith my keyer , so I

vary . You are seeing theaverage speed at w hich youw er e se n d i ng i n t hat1.2-second interva l .

J.'

to pin 12 of l e 3 in ther, and the output to the I I I I

see Fig. 2. The lED I I~ I I~s up o n the mark per-

,,~, d~,, aof the code character.

0 ~ , " .• 0 0 • < " •, • I,

hen sending code, the, •". rce

f-of t he speed w il l 4026 P- 402 6ay

~. .. • • .. • •0

I. ," r;-l ... , • , • L, .. , • L, • , ..'-"

'" ," '" '"I ~o

'"4 0'8 4 0 'S 4 0' 8 40 'S 4 08 1 I'-•• '0 '" .. • '0 '" • '0 '. • • '0 '"

,4 • I"),'

m m m"d,

" .1 K

" .1 K

Wdisp l

60 H'

LfD. I then connected t heinputs of the remaining 1/4reskeyel ED,l ighttion

• •

TO '0 P'~ '2, ~ " EYE R

114 I C ~

" ,

lowing connections. Thekever cl ock pu lse is obtained f rom po int D on thekever speed contro l. The60-Hz signal is obta inedfrom either side of t heseconda ry of the powertransfo rm er and groun d.The resistor values shown,R1 and R2, are for t heHeath kever. A convenientsource fo r the 5 V dc is thespea ke r lead t hat is connected to the 5 V d e supp ly.

I rep laced the neo n onoff indicator lamp w ith an

Fig. 2. LED mark indicatorfor keyer output.

"" See List 01 Ad_err,sers on page 130

CLOC K

Fig. 3. Code-speed reader for the Heath 1410 keyer.

•

Keyer on a ShoestringHams are cheap and so is this keyer.

Big spenders will build the deluxe, two-chip version.

not iambic or se lf-completing, it lacks contest m emories, weigh t control, and afew ot her bell s and whist les, bu t it is simp le, d rawsvery l ittle cu rrent, f its nicely into a smal l package, andis ca pable of send ing good,cl ean CW. A keying t ransisto r and f loat ing groundm ake it usable wi th ju stabout every modern r ig,and a side tone c ircu it canbe ad ded easily if your riglacks o ne. In short, it makesa good first kever or a nicesecond circuit for the vacation or Q RP set

-----L" /, ," I, I

Y J'/ " l RA ~S"" T H RI '

I "I 'I ',--- -

\REvERSE IFNECE SSM y

good one you can build foraround $10.00 using all newparts. If you 've got any sortof junk box at a l l, i t sho u ldcost you quite a bit less. It's

M o s t g re at k eve rsaren ' t v ery c heap,

and most cheap keve rsare n' t particu larly grea t.How ever, here' s a fair-to-

loel R. Donaldson W B5PPV17 Fenwick DriveLaredo TX 78041

..sIA~' 111

", , ", ' • CV ","' "• ~.F "e

". • 1 I. I. , •ur " . )• ..-cccc ..

'" "., • J«l I" .,"' 276 ·l006

, •• " •"' • '.',~ "'U',,"ER

As shown in Fig. 1, thew ho le kever is bu il t arounda 74COO quad NAND gatewhic h is connected to formtwo independen t osci llators. The freq ue ncy of eachosc i l la to r is d ependentupon a capac itor {C1 forone, ( 2 for the other) and aresistor (R1 fo r one, R2 forthe ot her). By simultaneously varyi ng R1 and R2, bothosc i l lators can be spedup or slowed down, and athird resistor (R3) makesone of the osci llators run a

..,S I0E10 ~E

lQRTIONAl-1

(<)

"')". 02

• •

" 9'0"'"

,S IB • IO~

Fig. 2. Optiona l sidetone circuit connects to the kever at points A, 8, and C.


Fig. 1. One-chip keyer circuit. The en tire circuit must be isolated from the enclosure. R1,R2 - 30k or SOk "s tereo" linear raperduaJ pot. 01 , 02, OJ -any silicon diode. Q1 shown isa Radio Shack part number.

r .... _ 8[11,t..V PL ~S "'lPO"IC' ~'

Fig. 3. Typical arrangement of circuit boards, controls, andpaddle.

,I

V intage CW rigs abound onthe used m arket, and agood Q RP r ig ca n be purchased new w ithou t goi ngtoo far into debt. Cos t ingabout as m uch as a cheapmicrophone, thi s ci rcu i t refl ec ts the same spi rit o f funo n a shoes t ri ng. Use and enjoy.•

Blacksburg GroupBox 242Blacksburg, Virginia 24060703/95' -9030

,,,,,,,II,,,

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8A'H~'ISIO( "~'SI

Price: From S59.95Contact BlackSburg Gf"Ot.4l for

rrore information. _U..j... 118 ~

The FIST FIGHTER TN

Using a straight key or "bug r Then send yourcode with the Rst Rghter, and make it soundperfect. "Swing" and ragged edges are filteredout andyour dots and dashes are always timed,1:3. No new hand motions or special key needed, so you'lI send code like a pro in no time.Great for novice or old-timer.

swi tc h was used to co nt ro lbo th the kever power andsidetone, as the HW-101 al ready has a sidetone buil t in.

With t he cost of am ateu rrad io equipment what it istod ay, CW just has to offe ro ne of the best potent ial sfor having a lo t of fun w it hout spend ing a lo t of money.

done again , since th is ratiostays about the same over afairl y w ide range o f keyingspeeds and battery vo l tages. However, if it is antic ipated that several o perators of w idel y va ry ing profic ienc ies wil l be using thesam e keve r. i t might be better to m ake R3 a frontmounted control o r at leastprov ide a hol e in thecab inet for qu ic k screwd river adjustments.

It seem s kind of pointlessto blow a considerab leamount of money on a keyer paddle when the actualcircuitry costs so little, so Iwould like to suggest a rather unoriginal but appro priately frugal alternative. Itco nsists of a short piece ofsteel pa cking strap o r hacksaw blade sandwiched betwee n two t e l e ph o n esw itch or relay co ntac tsThe packing st rap or bladeis scraped clean of all paintin the co ntac t area, and ap iece o f padd le-shapedPlexiglasI." w hich protrudest hrough t he f ront o f t heca b inet is b o lted to oneend . When t he padd le ismoved in either d irec t ion,the st rap touc hes one of thecontacts. The st rap needno t m ake a perfec t co nnect io n for the kever to operate, since the CM OS oscill ators w ill operate even wi thsevera l thousand Ohms ofco ntac t crud . The st r ips ofphenol ic that insulated t hesw itch or relay before m od ifi c a t io n are u sed in t hesame app l ication ; t he ym ake sure that nei ther thest rap nor the contacts makean e lect rica l connectionwith t he cab inet. Fi g , 3show s one possib le arrangement for the enti re kever.including the paddle.

Rf sh ield ing for this CIrcuit is not too critical ; theprototype worked fine withno case at the l 00-W att level . I used a 1- by 1 Yz-inchpiece of perfboard for thekever c ircu it, and the side-tone was added as an afterthought on another smallpiece of board . A center-off

fi xed p e rc en t age f a st e rthan the ot her, thereby providing a defini te d ash-todot rat io The ou tput o fboth osc i llators is connec ted to t he sideto ne (i fused) and to Q1 , the key ingtransistor, through 01 and02, wh ich prevent o neoscillator from interferi ngwith the other. Q l conductswhenever either oscil latoris in the " on" sta te, thuskey ing the t ransmitter instep with the oscillators.

The sideto ne ci rcuit (Fig2) al so consists of a 74COOconnected as an oscillator,but with Rand C valueschanged so as to producean audio-f requency tone.The output of thi s oscillatoris sw itched by Q2, whichprovides enough d rive topower a sm all speaker. Thepitc h of the side to ne maybe c hanged bv u sing aslight ly d ifferent value forR4 . The sid eto ne ci rcu itconnects to the kever atpoin ts A, B, and C.

I men t ioned earl ier thatthis circu i t has a f loatingground . As shown on theschemat ic , no co nnect io nsare to be made to the kevercab ine t. This eliminates expens ive and hard-to-f indreed rel ay s, low ers powerconsu m pt ion, a nd sidesteps the need to m odifyt he kever whenever a d ifferen t transmi tter is used .A lso, it is suggested tha tyou stick to a ba ttery topower your kever unlessyou are ce rtain tha t yourpower supplv is iso latedfrom ground W hen connect ing the kever for thef irst time, it m ay benecessary to reverse thetwo kever output leads toprevent the tra nsmitterfrom being keyed all thetime (w ro ng polarity to Q1 ).After the correc t way hasbeen found, a connectorcan be so ldered on.

Adjustment consists ofmerely t rimming R3 untilthe dits are about one-thirdas long as the dahs. O ncethis has been done, it willprobably never have to be

73Magazine • November, 1982 105

Paul M Danzer Nl/I2 Daw n RoodNorwalk ( 106851

I Got My Ticket! Now WhatlA look at what Elmer forgot to tell you.

Fig. 2. Typ ical repeater.


II•.-u r M~• I CI ' YI. r .....S.." TE•

CO" U 'IlL T. .. .. S.. 'TII.. ' T OfO / OH

r ' '' E.

Local Time Band80 40 20' 15 10

6:00 am9:00 am OXNoo" OX OX3:00 pm Local OX OX OX or

Local6:00 pm Locall Local! OX OX OX or

Ragchew Ragchew Local9:00 pm Crowded Crowded OXi OX l ocall

Crowded RagchewMidnIght Ragchew Crowded OXi

Crowded-It allowed by license ctass

Fig. 1. "Best be t" operating frequencies for a newcomer(1 981-81).

For many recently licensed ham s, trying to

operate a new ham stat ionis just as difficult as learning the code or studyi ng for

the written exams. Anyonewho has ever been involvedin a licensing c lass knowspeople who have gotten licenses and set up stations,

but never quite made anycontacts on the air. Newhams have ma ny questionsabout operating, The follow ing are some of themore common ones,

I have had my station set upfor a month and ha ve managed to make just one contacr. How come?

Let's assume your rig iswo rking . T he p roble mcould be where and whenyou are try ing to ope rate.For example, on a Friday orSaturday night, 80 and 40meters (Novice band) arejam med and just abouteveryone has a problem. Ifyou try 10 meters and theband is closed, you sti llwon't work anybody. Thetr ick is to pick a band and atime when there are a number of stations on, but theQRM is not overwhelming.Try 40 meters in the late afternoon, 15 in the early evening, o r 10 on a Sunday afternoon (see Fig. 1).

Shou ld f call CQ or ;us t listen?

Use common sense. Ifyou tune around for a few

minutes and don't hear anyone cal li ng, you can try aCQ , but pick a quiet f requency and l im it your CQ,

Why limit it ? I though t thetradit ional 3 x 3 or even a3 x 4 was a good idea.

Look at it f rom the listener's poin t of view. If I hearyou cal li ng CQ for a longperiod of t ime and get t iredof listening to you cal l, Iwon't want to rep ly to you,If you are that boring with aCQ, think how boring youwou ld be in a QSO. W ith today's equipment, ju st ca ll"CQ CQ CQ de WA1WTBWA1WTB: ' repeat once,and then K, If there is no answer, you can always tryagam.

You said to p ick a quiet frequency. How can I te ll if noone ;5 using it?

Assuming you don't hearanything, just send QRL orIE. On voice, say " Is thi s frequency in use?" If there isno reply, you are perfectlycorrect to assume you cantransmit without botheringanyone.

310031SO3800100010SO1100l1 SO120021 000

21200' -'--- -'__-' --'-- -'---__L.. _

"' 0 0( 0c... ..' . IIU lON ""'"M' __/

Fig. 4. Adding ca libration marks to a sk irt-type knob.

73Msgszine • November,1982 107

Am I better off operatingCW or SSB to start wi th?

I am not sure what youmean by " better off ." Assuming license class is not aconsideration (you havemore than a Novicelicense), try operating bothand see what you like. Sideband initially takes less effort to operate but the frequencies are more crowdedduring prime operati nghours. You usually can dobetter with OX on CW without fighting everyone's kilowatt

What if I want to join a QS Orha t is already under wa y?

l et's be very blunt abou tit In some cases, you won 'tbe welcome. Hams are across section of peop le, nomore and no less. However,on CW, a simple " BK" isenough to be invited in. OnSSB, " M ay I join you? This isWA1WTB" or any Englishlanguage equivalent is acceptable. Be careful of using " Break."

What is the probfem with"Break ?"

It used to be the normaland accepted way to breakin but recently, especia l lyon repeaters. "Break" o r"Break Break" is used to indicate an emergency situation when you want tot ransmit in a hurry.

Is repeater operation different from other types ofQ50s?

Yes. Almost every area orrepeater is slightly different It is a good idea to listen for a while before youget on a new repeater. Almost all are equipped witha timer which will cut youoff if you ta lk for more than1, 2, or 3 minutes. depending on the sett ing.

What controls the rimer? Ireally don 't wan t to get cu toff in mid-sen tence.

Some timers reset assoon as the repeater's receiver no longer receives acarrier. Others reset as soonas the repeater's transmittershuts off. Some repeate rs

FREQUENCY

transm it a beep tone whenthe timer has been reset(see Fig. 2).

Why limit the tim e for transmitting?

The primary reason is toforce a pause betweentransmissions, and to do sooften enough to allow anyone who wants to join theQSO time enough to transmit his call . In addition, itallows mobile stations toget into the repeate r without having to wait any longer than a m inute o r two .

Do mobile stations have apriority?

Usuall y yes - both on repeaters and e l sewh ere.First, t hey are li mited bythei r motion as to how longthey w ill stay in range. Second, they are more l ikel y tohave seen an emergency situation or to need directionsor other aid . Cood procedure again follows commonsense-let a mobile inquickly to find out if he hasa problem .

I hear a lot about "kerchunking" repea ters. Whatis the story here?

Kerchunking is a verycommon practice of pressing you r m ike bu tton to seeif your transmitted signal isst rong enough to bring up arepea te r. Since it is a t ransm ission w ithout identificat ion, it is technica lly illegalbut it is also generally aworth less test Qu ite oftenyou can be on the fringearea of a repeater and be

TRANSMlnERPreselect Plate Load

0'o Driver

Fig. 3. Sample tuning chart.

able to bring t he repeaterup but be too no isy to copy.

Is there a better way?Sure . Key your m ike and

ident ify by saying, " Thisis WB1AJC-is anyonearound?" If you don't makethe repeater, nothing is lost.If you do make the repeaterand no one answers, i tdoesn 't make any difference since you won't haveanyone to talk to!

When I identify myself on arepea ter, should I use phonetics ?

W ith a li ttle experienceyou w ill know the answer totha t quest ion for your ownca l l. If it contains an F. S. o rother easily confused le tter,you can use phonetics, butit is not usua lly done unlessthe stat ion you are talk ingto does not repeat your callcorrectly. The same holdstrue for signal reportsthey are not usually given

TUNER/MATCHBOXInpu t L OutputCap Cap

unless asked for or youw ish to indicate a problem.

Which signa l reports areusually given on repeaters?Q5 S9 does not seem appropriate.

Since the signal strengthyou are receiving is due tothe repeater and not due tothe stat ion you are talkingto, the best you can do istell it you are copying OK(t'ful l quiet ing" ) o r noisy.Some hams will say " 50%quieting" which indicatesthey are copying half noiseand half signal, but thisnon-technical use of " quieting" is a wild guess at best.

What about reports on otherbands or when you are notusing a repeater?

I suggest tel ling the truth.On CW, if you had a tra nsmitter problem and yourtone was not T9 or perfect,wouldn 't you w ant theother guy to tell you? The

'~CTlON O~UL~-ST'CM L... e~L

I

bel on the knob sk irt (Fig. 4)or on the panel (Fig. 5) w iththe additional calibrat io nmarks inked in. Plain whitepaper fastened with rubbercement is also durable andeasily removed later. If youdraw l ines on the paper orlabe ls, you can protectthem w ith arti st's fixative orvarn ish.

Wha t is the second way o ftuning up without transmitting a carrier for an extendedperiod?

Actually you ca n tune upw ithout transmitting a carrier at all . It takes threepieces of equipment: yoursw r bridge, a d ummy load,and a noise bridge. First,connec t you r rig (Fig. 6)th rough the sw r bridge to ad ummy load , and at the f requency you want to operate, tune up your rig intothe dummy load . Then, connect the noise bridge asshown in Fig 7 and set theresistance cont ro l on thenoise bridge to 50 Ohmsand the reactance co nt rolto zero Ohms Next, tuneyo u r an ten na tuner orm atchbox for a mi nimumnoise as heard in your receiver. If you have a transceiver, be verv carefu l notto t ran smit w ith the noisebridge in the line or it wil lgo up in a very rap id puff ofsmo ke.

Now, remove the noisebridge and reconnect thetransmitter through the swrmeter to the antenna tuner,and you are ready to operate. W hat you have done istuned you r t ran smitter toits design condition of maximum power out into a50-Ohm load, and you havemade the antenna tunerand anten na look like a5Q-Ohm load . Connect thetwo (Fig. 8) and you areready to tran smit, with maximum power out. You canalso use this technique tomake up a tuning chart sothat you have to go throughthe procedure on ly once foreach 5Q-. or 100-k Hz bandsegment vou like to operatein .•

Some o f the knobs on m y righa ve cal ib ra t io n marksever y quarter of a revolution. Is this good enough toallow me to preset them ?

Probabl y not, but youcan ink-in addit ional lineson the knob o r use sectionsof self-st ick labels. Place asmall p iece of self-stick 1.1-

1guess I don 't understand. IfI have 10 tune my rig andmatch it to the antenna, Ihave to tra nsmit a carrier.

Yes, but you don't haveto transmit it for very longThere are at least two waysto handle thi s problem. Thef irs t is to make up a tun ingchart for your rig (and antenna tuner if you use one!Record the dial readings asyou tune up every 50 or 1(XJk Hz . Now , whe n youchange f req uency from oneend of the ba nd to theother, just set your knobs tothe chart and you will on lyhave to tweak them sl ight lyto tu ne up, which can bedone in 2 or 3 seconds (seeFig ] )

An y other common th ing~

to avoid?Sure . If you want to

sound silly in the middle ofa QSO, give out with an extended " H.£- l· l -Q-Q-Q-O"to check your plate currentor output power. Think howyou must so und on the o ther end. If you feel absolu tely compe l led to mak e acheck in mid-Q SO , sim plysay to the other guy, " excuse me," put your ri g intu ne, and make a quickc heck . H owever, puttingout a carrier for an extended period of time is a greatway to be unpopular andcau se unnecessary QRM.Besides, i t's pretty rough onyour f ina ls.

\.-- eUT FItQ" SE:V 'UOC llUlIIE L ""0 PL"UO 0..fou,p"E:",r P" .. { L

For e xample ?Break into an emergency

net when you cannot cont ribute anything. Keep making unsolicited, help fu l suggestions to the stat ion control ling the si tuat ion An experienced ham wo ul d saynoth ing and listen caref u lly. If the net control sta t ionwants help, he w ill ask for itspecif ic ally.

copy here OM plea se repeat your name, QT H, andmy report. " Besides, thereare real ways to be brandeda beginner.

•••. " ' OGET...... S.. ' T TE ..

1tO'Sl! BR IDGE

• •~ •

~a: .:e:X:Ffl(Q 'VEIl....n .....TUNE R Olt- .~ .. .t.TC Heo~

\SET e ot' OGE FOR

same ho lds fo r asking theothe r ha m to Q RS or slowdown.

rcAN TOINA

f ig. 7. Step 2: Adjust tuner to provide a 50-Ohm load.

Fig. 5. Adding calibration marks to a po inter-type knob.

L-.J..__.-o' ''Tf R UPt:.~.

DU.. .. yLOAD

Fra nkly, f was hesistanr toask. W on't a request to QRSbrand me as a beginner?

Possibly, but we were allbeginners once. Besides,what is the sense of send ing" R" (I have so l id copy)when you don't have thefoggiest idea what the otherstat ion wa s ta lking abou t? Iwould rather be cons idereda ham who just is not toofast on CW than the c haracter who se nds: " R R R so lid

Fig. 6. Step I : Tune up the ri~ into a d ummy load.

Fig. 8. Tuned up- without ever transmitting through the antenna.

108 73Magazine . November, l982

". II""2 2.f • n . ~£L4Y ,, ,

• ) ,"E~67

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I "c w FIL TER: This filter features a 400Hz bandwidth and no ringing. Touse it, tune your receiver so th at the coae-crecttoe oscine torduplica tes the signat you want to copy.-Ronald Folkert , BentonHarbor MI.

Do you neve a technique, modification, or eesv-to.avoncete circuit that your fellow readers might be interested in? If so, send us aconcise description of it (under fWD pages, double-spaced) and include a clear diagram or schematic if needed.

In exchange for these technical gems, 73 offers you the choice ofa book from the Radio Bookshop, to be sent upon publication. Submit your idea (and book choice) to: Circuits, Editorial Offices, 73MagaZine, Peterborough NH 03458. Submissions not selected forpublication will be returned if an SASE is enclosed.

CIRCUITS

""10 0 0 V

SUBSTITUTE TRANSFORMER FOR HEATH GEAR: The power trans former found in many newer TV setsca n be used with a vo tteoe-oouoter circuit to provide up to 450 volts dc, as well as bias and filamentvoltages. I used this approach to reptace the transformer in a Heathkit HX-1O; it also should be suitablefor the SB and HW series of Heath radios. (Note: Your rig 's wiring may need to be modified if i t has 12-VfilamentS.)-Terry Mart in, Ca rro ll ton GA,

\,-- -"tRUBSER FOOT

REMOVABLE MAGNETIC FE ET:Gear such as Drake 's TR·22C isfine for mobile or portable usebut often lacks refinements likerubber feet that make i t su itablefor use in the shack. My solutionto this deficiency was 10 epoxyseveral small magnels to somerubber feel and then s lick themto the bottom of the radio. Whenthe rig goes portable, jus t remove Ihe feet. If you don't haveany magnets handy, you can reomove some from the magneticcabinet latches sold in neroware store s.-Thomas HartAD1 S, Westwood MA.

,k ~.•• "' T~~gCF210 " aro« (F RO'" POlYPUSI,. ..

cr c a600~F 6 0 0 " F~60V 360VIFR O'" POl YPA" SI (FRO'" POlYPA"S l

" " '"" " "10 0 0 v 1000 V 1000V

" OV4C " " •F~ 1 *~'.,

~ "l OO TO l ~5Y 600"F ...

" SlO 81 0 TV TRANSFOR"'[R600 ~ F ~60V ,.

" !60V (FROM POlYPUS)(FRO '" POLYH"Sl

), '" .,6 0 0"F ...

~ ~60V,.

6. 3 VAC (F IIO'" I'OLYP4.S)>IOA

ce "'600~F ...~ 60V ,.(FRO '" POl YPU S)

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- 14 0 V

o 30 0 V••

SIMPLE VOLTAGE STANDARD:This circuil gives you a voltagestandard to check your VOM orelectron ic voltmeter. TheMC1403 will deliver 2.5 voltswhile the output of the LH007Dis 10 volts. Both sources are accurate to one percent or better.You can get other voltages byusing different members of theMC140X and LH007X precisionregula tor series. The diode canbe anything rated over 40 mAand 60 volts piv. -J. T. MillerN6BM, Yucaipa CA.

"', ",~"""'~ I

'"' 8~'-------.J

HEA DLIGHT REMINDER: If yourheadlights or parking lights areon. there will be 12 vo lts on terminal 4. If th e igni tion is off, termina/3 will be at ground. Whenthese two conditions are met,the transistor is turned on andthe buzzer so unds. KA5CRI19sugges ts that th is circuit can bebuilt in to a surptus seat-beftbuzzer.-Steve Stout KA5CAII9,Palat ine IL.

"

HEA T CONTROL FOR A SOLDERING IRON: This handy circuitallows you to reduce the temperature of a soldering iron. Just placea diode in series with one side of the ac tine. You can easily switchthe control in and out by shorting the diode. The potarity of the diodedoesn 't matter. t used a IN207D diode rated at 400 volts. 0.75 Amperes. Any similar diode wiff dO. - H. H. Hunter WBTYX, ColumbusOH.

--" 4711 ", ', '

AOO TO TH[ " C ;COtlTR Ol H[ AO : T ,0 0- 50 0 :

, ), o f '2 v ,, ,'. '- ,

SCAN DELA Y FOR THE AZDEN 2000: By adding a capacitor and resistor 10 the Azden 2000's control-head circuitry. you can ha ve adelay before the receiver resumes scanning. There is approximatelyone second of delay for each 100 uF of capacitance added.- HiamSandel KB2IV, Flanders NJ .

•

BOTTO'"

'"'lH0 070

. j N 0 oaNO

~ 4 0 50

@2 5V

" N/ t "'- aN Oour

73Magazine • November, 1982 109

,

FUNl14) Weary wh ile send ing

151 CW noises21) Old 160 bo tM'23t V,b,ople<es

241 Sometime key plating25) an-a" o rganization27) Negat..e charge26) Tralh c organIzatIon labbr.)

ELEMENT 2- MULTIPLE CHOICE

John Edwards KI2U78·56 86th StreetGlendale NY 11385

CW REMEMBERED

l.>~e 'I Of 001. _ ,lftl *'I~SOngIr.e '*'bghl 0 1II>eCW era.. All .... moretha" a o;:en ''''''' as •monn'll"'y 0' eleCtticilt,.r>d electronic communication, ON is on the way 001.

I ma~e th,s slat_' pI,l'O!ly as a ••'oonal obSoefVahon. Nobody ConcludIng W ayne) hasIo<ced me 10 'tllS concluso<)l'l. JuSllook .. tItle facts Thanks 10 mICroelectronics. '00001_phonoe lfanscertef'S need be flO la'ge< ,n sUe ll\al1 CW-onIV figs. Computer generated dig'talcommun.c.toon h.1 now .eacr-.cl • poont wt!e<e i t ,s ine.pensiYe and portable. Irs a.1!J(Ilasl... and more .81,_ man code. CW_eocepl as a meanS of personal enlOyrne<ol-is

..ashed up"ppoo,enHy. the FCC 30'_ *,th l",spoont of ¥oew Sl'Kl<tly you"U see IheComm<ss;on '.

'""""" Itle CW 1l1QUor_' 'rom tne Tech lICense. A!le< IMI. ,ts ]U51 a .....llet of lome Citle.,.ea. 2COO soun<l'S good) belOfll'1>e !edS elImInate all code 'eQu;'emenls. In i'" age 01 15 andOs. d,ts and ll.a/'lS dor>"l ma". sense. JWI '''5 ON 'epIaced spa.... computerIzed communlC4l

loon technlQ'-"'$ ,.,,11replace ONBy now )'01.1' getl'ng the ,,,,,,,ng lIlal 11\31e CWo Not a t all. rve pounded l he Dl"ass ",,'h the

best ollhem. II"s JuStthlol J. ..~e mosl uue ''''00 amaleur5. look lonrwa,,' lo ne\OI challenges.And ON. ",1'"le londly rememDere<l. shoukl be 'ltlIlQa'ecl to tile dusty alhC 0 1 ham....,io

I'''SloryThIS monlh. _ look back al ON and 'eBecl upon II>e cont"bulKlflS " has made 10OU'

hobby. And II any ot you l'Iave anythl"ll 'O say atooul what !"ve w"n"" abOut ON. 'emembef, I

pass.ed a 2Q.wpm COde lesl Can you say Ille same?

ELEMENT 1-CROSSWORD PUZZLE

(Illustrat ion 1)

1) Silmuel F. B. MOfM . lal he< 01 telegraphy. was a man 0 1many la\eflIS, At lhe time he in·

venled 11>& I&leg'aoh, wl'lal was his protession?

1) ProleSSOf 01 srt at New YorI< Un,_lily

2) EIeCUlCal ftf"lll'-3'1 Lab assistanl 10 Tnomas Ed l"""41 Proles!lOf oltt>eoloo;ly at Yale

21 Wllal were the h~1 words I ran""" lled ..a code?

1) Tesll"9 one. lWO. Ihree21 Hello. Wl t_ , Can you lIear me?

Jl Greell1'19S "om The p,-esideflT41 Wllal hlod God w' oughT'

31 The In_Of ol lhe VIDo"ople . semiau tomatIC key waS

II Hvgo Gernsbac~

2) Hor_ G Man",

Jl T",,",85 Ed'_4. Cla'ence T........

41 WI'uII dod H lfam Percy MaXIm name hIS la-oo'lTe spar!< t,an"",m er"

II Spa.ky2) Old Betsy31 lillie Oertono4. The "RRl SpecIal

51 What devICe w" uI<!Jd on telegf;oplliines 10 creaTe an audIble sound alll>e I~"noena?

I I toel erodyM beaTer.""'''''''31 Beat·t ' eQuen<::y oscillalOf4) Mechanocat aUCIlo osc-uaror

ELEMENT 3- TRUE·FALSE

Element ,See IItustraloon lA,

EIemen.21_1 They atwa.s said lhaT "'arnlflg the code was an an.2-4 Funny. MorM dodn·t ,nctude God as a oo-;n......,tor in I'IIS patent

3-2 Whal' you dldn·t k"'OWIh,S one?4-2 The l.eag.... Sll~ I'IaS II in ItS museum.5-2 ClICk. CllCk-elock. ClIck

E~m~IJ

I-FalSft. toe wrote That c.ummy CB " Con""y" SOfI\I,

2- FaISft. " menean3-FIISft FInley Bt-_4_TrIM!. Why nol? II's the one the FCC tests us on.

YEI<;DROABI<;Cll CDESEP

THE ANSWERS

ELEMENT 4- SCRAMBLED WORDS

"'"'GRINSP

SO"IGHTEWI NG

GOOCCNonAYREI<;E

I) c. W. McCall was tee ,nvento, 0 1 "continuous

waveS."2) Samuel F, B. MorS" Invent ed the continenTal code

3) The in" lals F. B. in MOfse's name stood to'" Fine BUSIness."

~I It's legal 10 S"nd conl lmm lal code on US ham

IreQuencles.5) The f CC oltlcial ly banned spa rk Iransm issions in

1 95~

6) Our end Of message signal-AR-is nothin g bu ttl", Amefl can Mo.se lette,s FN mean ing " Finish."'

71 The "G lass Arm'" is the top awa,d presen ted byth e Sociel . o f Wireless Pioneers,

8) Barry noidweter IO UGA is t ile ham who int 'ooucec Ihe league's "Tune In tile Wo. td" CW p,ac·

li ce l ape,\)) The I"SI memory keyer used six relays

10) .6.t one l ime, the EoT';O·Class t lc ~el ' eQui'edprol,cieney at 25 wpm.

<>OW"

1) Poinls On a ~ey

2) Pressing a key31 Weak signal p lace to noise41 Early cod e mode

51 CW subband location7) US President's ini tial s

10) End 01 message (abbr.)12) A Dug is semr- _

251 Jammer261 Some say CW does Ihis291 ARRl brasspoundlng poSIHon (al>bq

30) No code ops?

Aeross

II Whal Ihe " wave" in QueSIlon IS

61 As opposed to amate'" (aPP')6) OA N s,lencer labbf,191 Hams can't be tnis

11) FCC 'ule eecnon131 Nol (Iown\41 Telegrapher's slang to' sh it!161 Slash1713 1416) CW term ot at tecucn19) c w chuckle20) lea'nlng code IS th IS

22) Ham organIza tIon241 ARRl 's Stan

110 73 Maga2ine · November, 1982

5- Fa lse_ 1927.6-True_ You learn something new eve,y day7-False. A " g lass arm" is a weary arm,8-False, Jean SMpherd K20RS did the honors.9- TlUe, Developed in 1953. l he " Ult im at ic" used six relays, No microchips then_to-False, It has always been pegged al 20,

Element 4:(Reading tram lettto right) BUG, KN OB , KEYBOARD; CO NTACT, SPRtNG. CLICK; KEYER,

FtST. SP,ED: WEIGHTING

SCO AINGElement I

Twenty·f ive poin ts lor the completed puzzte. o r one-hat f point fOf each quest ion correct lyanswered,

Element 2:FIVe point s for each correct answer.

Element 3:Two and one-hall poinl s 10' eaCh correc t anSwe r.

Element 4-

Thr..... and one-hall po ints for each correct answer_

How wel l do you remember CW?

1-20 po ints - Not at all21·40 poin ts-Vaguely41-00 poin ts - Fai led t3 wpm twice61-80 poln ts -CW buff

81-100 + points - A1 Op Club Member lIIuslratlOn IA

HAM HELPI need the schemat ic and manual for a

Knightk i t color pallern genera to r. mode lKG-685. f will pay lor copy ing and pos tage,Thank you ,

John C. McKee1127 Vern ie

Alton IL 62002

Does anyone have a recent l ist Or ro lltube chart fo r tne H,c kok 539B tube teste,?It shou ld be no moea than 2 or 3 yea' s o ld i f

poSSible

Marvin Mos. W4UXJBox 28601

AtlBnta GA 30328

We are happy 10 provide Ha m Help lis t·ings f ree. on B space·a vailable bas is , Weare not happy when we ha. e to take t imelrom other dulies to decipher crypticno tes scrawled illegibly on dog-earedpost cerds and odd-sized scraps 01 paper.Please rype or print your request (neal/y '),double speced, on an 8 'I, " x t I " sheet 01paper and use upper· and lo wercase lelrers ""IIere approprial e, Also. p lease ma kea " 1" look li ke a "I, " nOI an " I. " ""IIichcould be an "el " Or an "eye." and so on_Hard as It ma y be to believe, we are not la miliar with every piece orequipment man·ulactured on Earth tor fhe test SO years 'ThanKs lor your cooperation_

I need an l6 passb and tuning coif (partIIK42031-1) and an L1 b ifllar coil (partIIK42032-1). Bom are 10f the Hatfic ra ttersHC-10 co nver te r. Ca l f m e co llect a t1901)·733·2447 or contac t me at the address provided

Jack NorrisBox 321

T.lkee tna AK 99676

t am looking fo, a me te r for a Kn ight·k,t VTVM made by A ll ied Rad io Corpora·

t ion and a meter 10' a Simpson 260VOM 120.000 Ohms-per-vo lll Anyonehaving e'ther o f these two items, pleaseco ntact me ,

Guy A_ Eltler WBSJEV1316 Ma in SlIeel

West Point KY 40177

I need the sc hematic d iagram s andowne(s manual l o r th e Knight ki t T·150Atransmille, and the R-t OOA receiver_ I willpay all postage and copying costs

Anton io V. Vill aneuv.clo Mrs. Erl inda V. Pastrana

7218 Belinger CourtSprlngtleld VA 22150

NEW TS830S for $150?

Yes indeed! Just add a Matc hed Pail o f topquality 2 .1 KHz BW (bandwidth) Fox TangoFilters. Here are a few quotes from users:

" M.kes • n e... r ig ou t 01 m y oid TS830S I "" VBT no '" ...orks the ....y I dream.d it should ".... .Sp<JCUleul.r improvem. nt in SSB •• ' .elivity "

"... Compl.tely e liminetes my n. ed for. CW IiIter... ~~...Simpl. ins t.lI.tion . • xe.lI.nl instruction. ... "

The Fox Tango fil ters are notab ly superi or to bothoriginal 2.7KHz BW units but especially themodest ceram ic 2nd IF: our subs titu tes are a-polediscrete·crystal construc tion, The comparativeFT vs Kenwood results? VBT OFF - RX BW:2,0 ve2.4: Shape Factor: 1.19vs 1.34: 80dB BW: 2,48vs3.41: Ultimate Rejection: 110dB VS 80, VBT SETFOR CW at 300Hz BW - SF 2_9 VS 3_33: InsertionLoss 1dB vs 10dB,

OPTIONAL CONNECTIONS

Fox Tango tilters for RXandrx: Fox Tango for RX Kenwood for TX; FT for AX - sw itch-select FT or Kfor TX: switch-select FT or K for RX/TX,

INTRODUCTORY PRICE: (Complete KiI)...$l50Incl udes Matched Pair of Fox Tango Filte rs,

all needed cables and parts, detailedinstructions.

Shipping $3 (Air $5). FL Sales Tax 5%

ONE YEAR WARRANTYGO FOX-TANGO-TO BE SURE!

Order by Mall o r Telephone.AUTHOR IZED EUROPEAN AGENTS

Scandinavia MICROTEC (Norway)Other: INGOfMPEX (West Germany)

FOX TANGO CORPORATIONBox 15944S. W Palm Beach FL 33406

Phone (305) 683-9587 ...323

CW MORSEfor the

TRS-BO* COLORCOMPUTER

Our Plug- in Morse - PakDin terfaces the Color

Comp u ter to yourtransceiver an d allowsyou to commun icate in

CW Morse Codethrou gh th e compu ter .

«lns toils in mtnu tes «« S imple to operote«

*Han dles code s peedsup to 60 wom -e

man y more featu res•••••••••••••••••We Sloe " ° (O"',,"'le Ii"c 01 <oIor com,wlpeo«e<w,·i'>'.lnc!U (!lnq ,

' FloPPY d,," controllers ' Se r wl 1mI'or" • Ad(j 0" fP RO.... k.r, . I'rllq in[Jr""db""ed< . R A " t ,pon,io" "'I'.r6K-b ' K • ,md moe.'

Wr ite for b rochure to:ATOMTR ONI CS ..- 186

3195 A R IZONA AVE .LOS A LAMOS. NM 87544

•-r andv CO",Qrol lon

SS 8 ~ILYE R

,,,,

US8 B~Q

33gG5 KH ,

sse FILHP

Fig. 1.

,,,,,,,,,I,,,,,

CW ~ILYER CE"TERFR EQUENCY 33'15 ~I< '

CIRCUITSDo you have a technique, modification, or eeev -to-auoncete cir

cuit that your fellow readers might be interested in ? If so, send us aconcise descrip tion of it (under two pages, double-spaced) and in clude a clear dia gram or schematic if needed.

In exchange for these technical gems, 73 offers you the choice ota book from the Radio Bookshop, to be sent upon publication. Submit your idea (and book choice) to: Circuits, Editorial Offices. 73Magazi ne, Peterborough NH 03458. Submissions not selected forpublicat ion w ill be returned if an SASE is enclosed.

,,,uSB ere339 6 .5 K~ ,

" , s,,,,,,,,,I,,,,

~IU E P CENTER339~ KH'

Fig. 2.

CW FILTER~

• /NE W l SB ereC~'STAl 3392.19K HI

MINDER ALARM: The circuituses just two components, onesilicon diode and one Sooetent (4·28 V de). Both of theseitems can bepurchased surplus.The diode is a prevention de vice,protecting the signaling deviceand ensuring that the ignitionswitch is isolated from th e circuit.- Rich ard S. Shepard AI5H,San Antonio TX.

TA'lLI".. T 1 ~ 4 00 1 O~S1N I TC~ EOUIVEUNT

TAILLI G~TS

l ''''''Y IO''O~ ACCSW I TC~

•

SIMPLIfiED HEADLIGHT RE-

GENERATOR

'"U TEPN H OP

c cOUYPUT

••ORIGINAL CO NNECYIO!:'.o--

"/~O'" N'" CONNEct'O N

'0 ALTER NAfO R,~ERE. "' "• • • •

, . "' ,", ,0 0•

1 1•0 0

p""'"" OY OR

LS B ere8328 5 " HI

SS8 fiLTER

210 ~l

C'" ~ IUE~

~

M : S,,,,,,,,,,,,co. f ' LTERCE NTE~ F~ EO

B3301 KI<I

SSB FILTER CENTE~ use eFOFREOuE NCY 8330 K~' 8HI5 K~,

F~EO UE"cY_

Fig. 3.ORIGINAL £LECTR ICH SY5TE" A" " LIORY sysTE "

MODIFICAT/ON TO THE KENWOOD TS-520S FOR AFSK: Fig. 1shows the passband of the Kenwood TS-520S. By installing a crystalwith a frequency of 3392790 Hz, the RTTY tones of 2125/2295 Hz wiffbe righ t in the middle of the filters ' respective passbands. See Fig. 2.

Fig. 3 shows the i-f filters. When insta lling the 270-Hz filter, followthe direc tions given in the manual except for the foi/owing: 1) installthe filter in the SSB narrow position; and 2) j umper lead "A" to the"SS N" position and jumper lead " B"' to the "SSB"' position.

To set the filter, turn the switch to "CAL " and tune for a 221O-Hztone (a scope is helpful, or else tune to a null on your RTTY tuningmeter). - Aichard Ku laga KA9EOX, Fond du Lac WI.

0_5VOC'"" '000 OHM/VOLT

DC VOLT "ETE~

DC AUXILIARY SYSTEM WITH ISOLA T/ON: Presented here is a simple auxiliary ba ttery system. Battery B2 is isolated from the primarybattery by diode 02, and 01 is protected as well. Both diodes shouldbe at least 40 Amperes forward current, and 50 to 100 piv. A heavywire from the junction of the two anodes connects to the chargingdevice terminal. Do not rewire so that 01 is between the battery andthe starter motor.-A. W. Edwards K5CN, McAllen TX.

"r-::/.~RECO RDER --<3. ,.an OUTPUT

--<C I K I

""

AUTOMA TIC CO CALLER: Record and send CO or CO OX-or anymessage - cheap ly and eesttv. Begin by recording you r message ona cassette tape. This recording wi ll be used to drive the circuit .Mount the full-wave bridge astride the relay (K1). Solder the + andcommon leads to the coil leads. T1 is Superglued to K1. Theassembly can be moun ted inside a transceiver or outboard in a box.Wire th e rela y output to the keyjack. Install a jack to receive the audio ou tput from the cessene. Endless-loop cassettes are availablefro m Radio Snec«. Five-minute cassettes are available fromPyramid Data Systems, 6 Terrace Ave., New Egypt NJ 08533.-DaveNesbitt W D4AAW, Decatur GA.


100WlU 5","4WATTlE N<~ DIODE

•All lO"O TIVEHECY~ ICAL

SYST["0----.J

AN INEXPENSIVE EXPANDED·SCALE VOL TME TER: Use an unsealed D-5-V-dc 1000-0hm-pervolt meter movement. Solder ato.ovon. 5%, w-warr zener diode to th e positive meter terminal (this is loca ted under the

case). Use as short as possible alead for good mechanicat stability, observing zener polarity.Change the numbering on themeter face to 10-15 V de. Useeither a razor-pointed markingpen or dry-transfer numbers. Reassemble the meter and fest itbefore installing It in your cer.To ensure greatest accuracy,pre-check the zener and makecertain that It is as close as possible to 10.0 voits.-Atan Christian WA6YOB, San Jose CA.

SOCIAL EVENTSLlstmgs in rll,s column areprovlded1~01

Clta'fll! on a Spa<;:t1--B"lllla~ baSIS. Tile /oJ.

Iowmg mlormal/Ofl should be ,no;hxH!d III

ewer)' af'lflOUn<:fffr>l ' SPO"SOI. _,, date,

l ime. pI/ICe, c,ty. s fale. ~ml$S/OfI CII¥fJ'1 II'any~ IUIures. lalk"" I~,.,s. .fI(/ IIIename 01whom to oontacllot lun_ tfIl~

Non. A~ts mllst De ,!'C....., a f 13""agazI..... by rt>e I If$I 01 /"., motlm. rwomotIms pnor to flte moItl" III ...h>t;tIllIe_tfak~ place. Ma" to Edltonal QltICftS- 13MIlO"anne. PIne SIree1. Pl!otetborougtt NH 03l511:

DEARBOR N MINOV a.

Encon Corpatal>Of1. ,n cooperat"", W'l hSola 'e . CorpatillllOf1. .. ,II Pi"oY.oe • I,eepnoloYOlta,c lelec"'C' ly I.om Ill<! sunlsem,na, a t 7::10 pm on NO'tlI'fT1 be<. at Ille[)ea .bC!<n Hyall Regency. Oea' !>o. n MI Alalk on lhe h,s lory , Pi"oduchon. arod aPOIo ·cal lOf1S 01sota . cens ... ,11 ,n form anc:l educ a le a ll tho se whO a!lend. For .e,..,...a·IIOf1 S. ccotec t Eneon Co.po,a llOf1. 17~School C.a 11 Ad.. L,won 'a tJl l a.B15O; (3 13~26 1·4130

SOUTH GRE ENSBURG PANOV6

The Foolh ,lIs Amaleu' Ha<t,o Club w,llnOld olS " " nu,,1S ",ap a nd Shop on Salu'tJa~ No "e m!.>c ' 6 l\1ll1. "I Sl 8,unoCnu,cll. Soutrl G reensf>y'9 PA 1".• eI5ar" $2.00 ea~1l a. 3 10' $~ 00 1 lit '" "",I l>e

"n ,n,loo, tlea "" " ket a nd lood I,. 'k " 0on1"607161 and ~2i~1 Fa, rn", , ' ,1"I,,,lsconlaCI Ma no Ca ",,"a WJ TTN <It ",tilt!FARC PO Bu v aoe. G' .... "sb"rg 1-'11 1'"rUl

Pi"oY'ded to Ill<! I" SI resevancos .ece'YedWhe n those la Dies a 'e gone. space woll be

a"a,laDIe 10' sell'ng f'om Ille f loo< or f,omyou. o wn taDle Food "", II be av a ilaDle, Sellers may set up a I8:00 am. and "'a lk·,ns willbe adm'l1e<1 "om 9:00 un" l 3:00_ Fo . _ ·wahons. send C!>eCk or money oroe. Plly'a~ 10 "SCARA" 10 Ed GoIdbefg WA1ZZ0 .4JJ EllSworth A"""ue. New Ha...... CT~T1 Inc lude an SASE 'or conf"mat"'"

8 ANGr;0 r; THAILA NDNOV 11·1.

Til<! Aadoo A""'l eur Soc...t ~ 01 n"',landIRAST) ....11 hold the 12111 annual South EaSlAs ,a NelWO<k eon"""t"", IS EANET 821 onF'lday, 5alunjay. ar><l Sunday. NoYe<1>Def11·1 4, 1982. a.r Ill<! Imper,al Holel. 8llngkOkThculanc:l T"""e will be jectc-es. d,seus·soonS. and comme<c'al e . h,bo lS. For mor"deta,ls. conlacl RAST Sec.elary. PO Bo.2008, BangkOk, Tha,land

NEW MARKET ONT CANADANO V 13

The y",k Reg ,on ARC w,1I hold 'IS a n·nual Ilea m.,kel o n Satu'da y. Novembe<13 , 1982. 1' 0m 0800 to ,.00 EST . a l lheNe ...ma ,ke l Commu nily Gent'e. Newma r~e1. Onla"o. Doo's w,1I open a l 0630 lore .h,bno .s. Gene'a l a dm iss io n '5 51.00(C h old .en ...ill be adm'lled I,ee 01 cha'ge "a c c ompa n'ed b y a n ad u ill. Re l' e s hme ntsw,11 De a"a ,laDle , E.h'b,lo's ' ta b le s OI l"$100 each Ta lk·in On "1.51 (V E3YRAIand la. 1 11~ f125 (VE3YRC)

BILL ERI CA MANOV 20

The Honeywell 1200 Rad io C luD aM IlleWallham Amateu, Rad'o Au oc,al ,o n w,1Ihold Ihe" annua l amateu' radIO a nd "Ie<:,tron ,c s a UCl,on on S<olu'd a y, No"emDe, 20.1982, a t the Hone y...ell Plan!. 300 ConcordRoad. B,lIe" c a MA le..1 2 7 a rt 'ow e 3)Doors ...'11 open a t 10 00 a m ancl a dm ,s s ,ona r><l pa' ~,"ll a 'e t.ee The<e w,1I De a snackbar and a ba' ga,n pa' ls slore. Talk·,n on141 121 12 a r><l 146 ~. 64 For more ", lor"",lIOn. con lac l Doug Pu'dy NIBUB, 3 v.sccRoad . BUrl,ng lon MA 01803

C ANTON O HNOV 21

Th e tJl a s s , lIo n Am a le u' Rad 'o ClubtW8 NPI w,n ple"""l AucHonllllsT'82 on Ne>-.emile< 21, 1982. a l lll<! Naz" G'ono Ha ll.61h a nd Ouebe< Avenue SW. Canlon OHAdva nee Io<:kels iIl' lll S2.!JO: al Ill<! door,53.00. Dooo-s .. ,II opetl iIlI 7;00 iIlm for .... tups arod 8 :00 11m lor OIIl<!'S. Troe a.uehonw,1I s Ian a.l II :OO .m TiIl lk·,n on 1"6 51.For itd"ano;e h CketS or la DlM . eont actSteve Neve l WOllMIJ . l~ tJlassac hu....lI S Awenue SE. tJl llSS,11on OH .~

GREENS BORO NCNOV 21- 28

Til<! G'eensbC!<o Amaleu' RadIO Clubwoll hOld lhe second a nn"al G ,eens!>o.oHami eSI on Noyembe< 17 - 18,1981 , el theNal.o nel G ue'd A,mory, G'eens!>o.o NCThe hou's "",II be 9 '00 am 10 5:00 pm onNoyembe. 21t h and 9 :00 e m 10 3:00 pm onNo ve mbe. 18th, p,e ·' <l(l ' S1 .al io n betcreNoyembe. 11, 1981"5 53.00 end ,eo,al '.h a n OIl 1M dao, is $4.00. The.e ...ill belables a nd la,loa.I,"O av..,Ia bl",- Tal k·," on145 .15. ,191.19 , and 51. Fa, p'e ·.e9,st'a ·non (please incl ude an SASEI a . mo 'e

detailS, COnTaCI Rus s Brand l KE4KL, 130 1Dayton SI,,,,,t . c reenseorc NC 27407,

STONY BROO K U NYNOV 28

The Rad io Gent'a l Amaleu, Ra<j ,o CluD"" II hold 'IS fOll rTh a nnua l Ham·Gen I'IlI.1982 ed,t,on . on Sunda y. Novembe< 28,1982. ,n Ihe ""'''' soc,a' ha ll 01 TempleIsa, a h. 140-4 Siony 8 rool< Road , Stony8flXllo. U NY la llou l 50 moles ellst 01 Ne '"York Cn Yk Doors "",II apen a l 7:30 a m lorsell...-s ar><l """"""s and a t 8.:10 tor llle gen.eo-a l put>loc. Adm'sSlOf1 os $2.00 a nd llYl Sand CIl'Id,en unoer- 12 "",II De itdm'Ued ,,_N,ne·fOOI la DIeS a'e $5.00 eecn arod Il.llH

tables a '" $.3.00. Fealu,es "" II ,no;lude a nupda led a nlenna leelu'e by ArT lW2l H) ar><l

M."Je lon" (W1EEO. G ' een De' q . homeC<Jt.>I<e<J I'ool fOO<J a nd d''''''s T"lk m on1 ~~ ~14'>. 1!JO IWA2UEC, a<>rl 14652 Foo

~,loonal ....100""'1""'. ma ps. " nd a<h""ce,,,,,,,,."loo<1s. coolac l Scally Pol,castroovVEQW 1lO71hSU....l Bohem'a NY1 11166 ,,,,.':>1:1925'>1, '" Bot> Y"r",us K2RGZJ Ha"",' Cou,I Ldke GrOWl! NY 111~

,'> I"'I'll:l127oo

HAZEL PARK MIDEC 5

The 111h annual Hu e l Pa, k Ama le" ,Ra<l,O Clutl Swap a nO Shop w,1I be heldSunday. Dec ,>, a l Haze l Pa ,k H,g hSchool. Haze l Pa, k MI Haze l Pa ,k H'ghSchOOl '5 localed on Hug hes 51'....1a l 9 ' .,,", rle R<l I m.le easl 01 I 1'> T'ck"r~ a'"5150 on a <lwance Of $2 00 a l lhe doorfa b les are $1 .00 Pt" 1001 Ouu,~ O!>t'n.OIIl 00 a m Ple nt y 01load a nd p a rk"'\1 Will beava ,la ble Talk ,n on 146 .'>2 F" , I,cke lsI,.ble fCse'" a r,ons. a nd ,nl"flnar,on. se',,1an SAS E to Haze l Park Amal e u' Ha,looClut>. PO Bu . J6Il . Hale l Pd, k MI 41lO30 <H

lelc' Vhon e j3 1J,·J91l J 1119

*

""=

•

r.o. /10.\ 711 \/alliu m lIt'ighlJ, '/I -ilto ll

S"b'<fi~HO. Co., fo, 10·ICOM or J(~ " ..ood ~ ~...I~"... L'SA I~ . oo

A. "..118ul!. R. ,. ), 1 12,00 Fi, o< CI. .. , Coo. d. " M~ . iC<l ' )0 .00 .•1•• _.. II... (Ai, M.olI ' 12.OO llrU:IAl r a K E r oa BOTH .'Ii.u n ;.l.E1TEL '; 1:It... ..... 12.• on' l 'litll\'IOL: AL r aK ElI . " ~ h ••o' 101 ...., Ch. " • ••d\"ISA T~ I. p hoo • • ,d.,. ....... pl~d , ' ,,-• • r~ • • ,010'''' '''0. ~ 1 <ho" I . I" ,

ICOM . ad T"o/ l( ~~ ..oad t ••,. - . Pl. .....ad . S.A.S E. lo, a", i.f",,,, • .HD..1h'D<h",~ • • d h., D' ICOM " I( ~ ." oad J( ;.. So-.d '0:

USERS INTERNAT IONAL RADIO CLUB364 KlIp.ltrlck Ave. , Port St . Lucie, FI3345~

USA . Phone 305 /878-7296 ,..119

ATTENTION : ICOM & KENWOOD OWNERSPIF YOU AR E NOT RECE IVING OU RMONTHLY NE\rVSLETTERS, YOUARE NOT TUNEO INTO A WEALTHOF INFO RMATIONI!!

DON 'T TIM E OUT. . . TIM E IN

Toggle Time i , a 10 minutetimer that would be utilizedb)" a ham to keep within FCC10 min. 10 rules . II is acruat -ed by a toggle switch which-Documeruauon ......• •SIS.(J) <;.('T\'~ 1"0 purposes:

Dealer * ~in\ timing period "hen fIO"Ct" j , applied.Inq uiries W h e n Toggle Time timc-, out illc" )OU know with a loud tone. P r ice $ 14 .95

Invited Shipping & Ha ndling add S2 Send check, money order or COO "battery included

,.. 140 * Wh",n <>rd",rinlit , plnlw , pn'ih mud el * 31 /4x21 /8xl l /8

COMSTA R RESEARCH

Introducing Toggle Time\ 11Xic! TI -IO time alert for repealer operators to avoid Timing OUT repealer . (PA TENTEDl"Sensitiv e eno ugh fOI Il l', •Au tomatic; Sense, RF ca rrier-no co noecuon to rig - RaIlCT)'pow ered 'Re-;el' on ca rr ier drop-out - i\d j u , la l:1 k timing period ' Size 5 1/4 x3 SIl6x I 3/4' Weighl 8 ol .l226.8 Gram,Piercing, 6.5 "'Hz alerttone

Model T1- IO assembled. ,$69

\lode! TI-lOk . kit form .. S52Primed Circuit Board a nd

FORT WAYN E INNOV 14

The Allen Counly Amaleu. naoro Tech·r uca ! Soc,e ly. Inc. IAC·ARTSI. wi ll ho ldme IOlh annua l Fo . t Wa yne Ha m leSI onNo "a mbe r 14, 1981, a l Ihe Allen CounlyMe mo lia l Co liseum, Fo,t Wayne IN. Ad·m iSSion is 52,50 in ac vaoce and 53,00 a lIhe doo.: c hild' e n onde, age 11 wi ll be admill"d h ee. Regula, tables a'e $6 ,00 andp,e mlu m lables a,e $20.00. The Coliseumc ha rg es a 51.00 pa'king lee , Doo,s willopen 10 Ihe gene.al public al 8:00 am andfa , wenOO. s e tups al 5:00 am. Fa! fu.the,t,c ~el a. lable mfor ma tion. ..." Ie Beck~

S kinner KA9GWE. 9720 PinlO lane, Fo ,'Wa.yne IN . 6804

NORTH HAVEN CT.." ,

Til<! ceeence Amateu' Radio Socie ty,Inc .. ", ill hold ilS a nnual hamlnlon NoYllfflbel ' , 1982, from 9cOO am to 500 p<T1 . al theConcoro Boy.. Club. Sp""il $1'"",1. COnCOfdNC. Adm,ssion hCkel S are S2,5OInaovano;e,53.00 OIl ltoe dOOr. Fle.market lables ate$·un tabl-e space is $2,50. T""'e "",II be

!lingo lor ltoe liI<l...... _ak", .. dnd ' orum sHoI lood. beYe'dQe5. "nd hee P.or k'ng ""IIbe d"a,lable Ta'k.n on t"66&> Foo .odwanee I,ckels. ' lea ' lTla rke t la bles. or "",""esend a ceec -, 10 CARS. PO Bo. 12'90. eonCOfd NC 28025

Til<! Southcenl,al Connosct ocul Amal_Radoo Assoc.ahor'-s (SCARA'SJ Ih"d ennual elecifonOCS Ilea market w,tl De held onSunday. ~ber 1. 1982. •ndoQfs .ttheNorth Ha""" Rec,e.atlOO cen,,,, on LmMeySIreet in North Ha""" CT. RegUla, -.,sSIOO ". $ 1 25: crnldren uf'lller 12 wom anadult ...,11 be ..:lm,ltell " ee. Sellers ' SP8C8S

a ,e $6.00. The Desl:space$ w,11De eSSlllnellh,s!. A I,mned number 01t' " taDle$ ""' II be

SELLERSVILLE PANOV 7

The R F. Hill ARC wil l hOld ilS 6th annua l hamfes! on NOve m be r 7, :982, In lheSe lle,sv ille Na l,o nal Guard Armory , Se ll·ersvme PA. noe-s "' III open al 7:ooam 10'seners and 8:00 am 10' Duye's , There willDe re freShmen lS dnd t'e,,1 T,Ilk '" on l!1UIl!and 52 Fo, furl he ' m!orrna l,,,,) contdC!H F H,li ARC, 80> 29. Colmd' PA 11l9 1~

CO NCORD NCNOV 7

73 Magazine • No vem ber,l982 113

CONTESTSRobert BaKer WB2GFE15 Windsor Dr.Ateo NJ 08004

ALARA CONTEST

Starts: 0001 GMT November 13Ends: 2359 GMT November 13Sponsored by the Austra lian Ladles'

Amateu, Radio Association , the con testis open to all licensed operato's andSWLs throughout the wor ld, YLs workeveryone, OMs work YLs only. All bandsmay be used, phone and CW combined.Eacn sta tion may be worked twice oneach band-once on phone and once onCW, All contacts must be made in accor·dance wit h operalor and station licenseregUlations. No net 0' liSt operat ions, nocrossmode, and no repeatel con tacts maybe claimed.

EXC HANGE,

ALARA membe,s send RSln, serialnumber starting wi th 001, and ALARAnumber and name, Others (YL nonmem·bars or OMs) send RSln, se,ia l numbersta't lng with 001, and name.

FREQUENCIES.-

Pnone-3570·3590, 7100·7120 , 14260·14300, 141 80·14200, 21350·21370, 2118021200,28480-28520.

CW -3525·3535 , 7010·7020, 14050·14080, 2I 125·21135, 28100-261 10.

SCORING:

On phone-l0 points lor ALARA clubstations contacted IVK2DYL or VK3DYFI,5 points tor ALARA members, 3 poin ts forYL non·members, I point fO' OMs.

On CW_double all po int values shownlor phOne,

For SWLs-5 poin ts l or ALARA members logged and 3 points lor YL nonmembers logged.

AWARDS'

Certificates will be awarded to the topscoring ALARA member In each countryand VK call area; top scoring YL nonmem·ber, OM, end SWL on each contmen t: andthe top sco, ing VK Novice,

ENTRIES:

Send a single log contain ing date/time

In GMT, band, mode, ca llsign worked, ra.port and serial number eerwrecetveo.neme 01 operator 01 station worked, andpoin ts c laimed . Logs must be signed andshould show l ull name, ca llsign, and eodress 01 operato r along wllh Unal scorec laimed, Logs must be leg ible, eithertyped or printed, no ca'bon copies please,No logs will be returned and the decisionollhe contest manager will be tinal. Logsmust be received by the contest managerby Dec. 31st. Address entr ies to: Mrs. Me,·garet Lett VK3DML, 28 Law,ence St" Cas·t1emaine, Victoria. Australia 3450.

EUROPEAN OX CONTEST-RTTY

Starts: 0000 GMT November 13Ends: 2400 GMT November 14Sponsored by the ceoteceer Amateur

Radio Club (DARC), Only 36 Murs 01 operation out ot the 48·hour period are permi t·ted for slng la.opera to, stations. The 12hours ot nonoperatlon may be taken in notmore than th'ee periOdS at any time dur·Ing the con test. Operating classes In·cteee: single operatorla llband and multi·operator/single transmitter. Mult i·operatorls ingle tr ansmitter st ations are only al·lowed to change band one time Within a15·minute period, except tor making a newmuIt iplier, Use all amateur bands f rom 3,5through 28 MHz A contest OSO can be es,tabll shed between all coot rnents and alSOone's own cont inent, However, OSOs aswell as OTC tr aUic with one 's own countrylife nor aI/Owed! Each sta tion can beworked on ly once per band,

EXCHANGE,

Exchange the usual si ~ ·d igit numbercons iSling 01 RST and progress ive QSOnumber starting with 001.

SCORING.-

Each OSO counlS t po inl . Each OTC(g,ven 0' received) counts 1point. Mult ipll ·ers will be counted according to the surepean and ARRL countries liSI. The mUlt i·p ile' on 3.5 MHz may be multip lied by 4,on7 MHz by 3, and on 14 through 28 MHl by 2,However, conteCts within t he same conti·nent only count as a multiplier ot one perband (Including 80 and 40 meters), The Ii·nal score is the total a s o po ints eros ore

points multipled by t M sum totalmultipllars.

QTC TRAFFIC:

Additiona l point credit can be ,ealiledby making use ct the OTC traffic leatu,e,A OTC is a report 01 a confirmed OSO tnethas taken place earllar In the contest andiete r sent back to anothe' station- thegeneral Idea being thet alter a number ofstations have been worked, a list ot thesestations can be ,eported back during aOSO with another sta tion, An add itional Ipoin t cradi t can be claimed tor each ete

tion repo rted,A OTC contains the time, call, and OSO

number ot the station being reported , I,e.,1300/DA1AAI134. This means that at 1300GMT you worked 0 01. 101.01. and receivednumbe' t34, A QSO can be reported onlyonce and not bac k to lhe origina ting etetion. A max imum 01100TCs to a stalion ispermitted. You may wo rk the same stationseveral limes to complete this quota butonly the origina l con tact has OSO po intvalue. Keep a unilorm list 01 QTCs sent.OTC 3/7 Indicates that tfus is the 3rd se·rles ot OTCs sent and mat 7 OSOs arereported.

AWARDS,

Cert ificates to the highest scorer ineach classi/lcation In each country. rea·sonab le score prov ided , Con tlnente llead·erS w ill be honored with plaques, CertlH·ca tes will also be given stations with atleast hal t t he score ct the continentalleader or with at least 250,000 points. Theminimum ,equirements tor a cert ificate 0'a trophy a,e 100 asos or 10,000 po ints.

ENTRIES:

Violat ion 01 the rules, unsporlsmanlikeconduct. or ta king c redit tor excessive du·plica te contacts w iII be deemed sut fic ientcause tor disqualification. The decisionsof the contest committee are llnal. It issuggested to use the log sheets 01 theDARC 0' equivalent. Send a large SASE toget the wanted number oIIOl/S and summary eneets (40 OSOs or OTCs per Sheet!,SWLs apply the rules accordingly. Entr iesShould be sent no later than December15th to: DARC OX Awa rds, PO Box 1328,0·895 Kaufbeuren, West Germany,

EUROPEAN COUNTRY LIST,

C:i1, CT1, CT2, OL, OM, EA, EA6, EI, F,FC, G, GC Gue r, GC Jer. GO, GI, GM, GMShetland, GW, HA, HB9, HB~, HV,I, IS, IT,JW Bear, JW, JX, LA, LX, LZ, Ml , OE, OH,OHQ. OJQ, OK, ON, OV,OZ, PA, SM. S. SV,SV Crete, SV Rhodes, SV Athos, TA l,UAl346. UA2, UB5, UC2, UN1, U05, UP2,

U02, UR2, UA Franz Josel Land, YO, YU,ZA, A82, 3A, 4Ul, 9Ht.

DELAWARE aso PARTY

Starts: 1700 GMT November 13Ends: 2300 GMT November 14Sponsored by the Delaware ARC, sre-

tions may be worked once per band andmode for OSO and multiplier cred its

EXCHANG E:

aso number, RSIT), and Delawarecounty, ARRL section, or country.

FREQUE NCIES:

CW-1B05, 3580, 7060, 14060, 21060,28160.

SSB-1815, 3975, 7275, 14325, 21425,28650.

Novice- 3710, 7120, 21120, 28120.

SCORING:

Delaware stations eccre 1 point perOSO. Mult iply total by the num ber ofARRL sect ions and OX count ries wo,~ed ,

Others sco re 5 points per Delaware sta·tion worked. Mult iply tota l by the number01 Detewere count ies worked on aachband and each mocetmaxunum 0136 mu ltiplie rs possib le), The three Delawarecounties are: Kent. New Cas t le, andSussex

ENTRIES & AWARDS;

App ropr iate awards will be given to thetop score-e. In add ition, a certificate to allstat ions work ing all three Delaware coun·nes. 1/ you Work all th ree counties andwant the WDEL Award , send two 2Q·centstamps and an address label, Mail logs byoecemee- 17th to: Charlie SCulley AE3H,103 E. Van Buren Avenue , New Castle DE19720. Send an SASE to r a copy 01 theresults,

SANDUSKY RADIOEXPERIMENTAL LEAGUE

oso PARTY

Starts: 1800 GMT November 13Ends: 1800 GMT November 14The 50th Annive rsa,y 01 the Sandusky

10hlo) Radio Experimental League, Inc.,will be observed and celebrated wilh aQSO party ..hile members 01 the club ope,ate on live amateur bands using theclub call, W8L8Z, Frequencies will be:28150 and 7125 lor Novices: 3740, 7040,14040, 21040, and 28040 on CW: 3910,7285, 14280,21360, and 286000n phone. Allfrequencies pluslminus 10 kHz

v£u..ow THUN!)£r~"SMOKE S,gtU\LS

NEWSLETTER CO NTEST WINNERThiS month's winner is Smoke Signals, published by lhe Yellow Thunder Ama·

leur sec.e Club 01 Baraboo WI Thelayou t is superb and the amcies are writtenin a humorous, iow·key st yle. The newsletter is lul l 01 e ~ce llent news items tromaround Ihe nat ion and overseas, making it appear more li ke a net,onally-base dneWSletter. Also, a SChedule of all the traff iC net s in WisconSin is Inc luded Thepaper 15 lu ll of interest ing items, such as lo~ ·nunt ru les and updates on themembers' acnvntes. The ed itor, J,m Romellanger K9ZZ. has done an ootstaocing job,

To enler your club's newsletter in ou, contest. send a copy to; Ed,to, ia l 01·tices, 73 Magazme, Peterborou llh NH 03458


Nov 6·7Nov 13Nov 13· j4Nov 13·14Nov 13·15Nov 13·15Nov 20·21Nov 20·21D.c 4·5Dec 11 ·12Dec 19Jan 5Jan 9Jan 15·16Jan 15·16

CALENDARARRL Sweep'ta~es-CW

Aust ,all an Ladles' ARA ContestEuropean OX Contest- RTlYW5LBZ a s o Parl yNorth Carolina aso Parl ycc-weContestARRL Swaepstakes- Phon.TrinIdad and Tobago a s o Pa,tyARRL 160·Mal er ContestARRL 10·M ater ContestCARF Canada Contes t73 Magazi ne 40·Meter Worldw ide ssa Champlonahlp73 Magazine 50·Mele' Worldwide SSB Cham~lonshlp

73 Mal/atlna tBO· Meter Worldw ide sse Champ lo nshl ~

Hunt ing Lions in t ha AI, Contnt

RESULTS1962 SPRING BARTG AfTV CO NTEST RESULTS

Slngl.Operalo r Secllon

" . Call1ign Po int . TotalOSOI

t . W3EKT eeerse '",. EA8AU sreeec 3"3 W3FV ""'''' "6• G3HJC ~870 '"• 120l W "',.. 3366. I1TXD cosec '",. SM6ASO """" '"6 W.COI eeoc.. ,.,, I2WEG ,..sea '"t o, WB3CCZ 3765Hi ".

Mult l·Operator Sec tion, G3ZRS 513540 " 0a LZ1 KDP 505310 aar3. OH2AA .31600 3"• G3UUP """ '"• '.JXE '"'''' ,OJ

SI'M>r1... ... llat_r Section

" . Na""Calt Pointl OSOIt . OK·1-I2880 (Czech SWU """ '", V2·105.2110 (DM SWU rscosa "3 V2~K (OMSWU "'" 16

• NL.(83 IPAQlSW U 91276 '"• J . M."hews (USA) eaeec ec

All .m1lleura woridwid. 'r. invl tlKl 10p.rUCip.I., A apec l. IOSleardlce<!lfiea t." ,II be senl lo .1I who wnd l"-Ir OSl ea.rdto t"- OSllAa" ag.., W8lBZ, 2909 W.SI~'''' A....nue. S&l'\d uI.y OH «870.

CO·WE CONTEST

Starta: 1400 GMT November 13Ends: 0500 GMT November 15

Spo"sored by the B.I I System Amal. u rRad io Fr.lemity. Ih. ccnteet is ope" 10pres."1 ' ''d rll!irlKl .mployees o t BlIli.WlISI.rn ElectriC. ATaT• • nd subsidiaries01AT&T. Conlacl local inl.rwor• • coordi·na lor lor log s . nd compl. l. rul.S. orwru. 51_ Whulley WN8GUE. Betll.llorl torl.a. 2525 Shld.'. nd A...."U., PO80. 1008. Ind, . nI POIIS IN .a206, Tel.phon.: (3 11). 352.2•• 2 It wo r. or(311).5o$ S-.029 al nom e.

NORTH CAROLINA osoPARTY

1700 GMT November 13 to0200 GMT November 14

1200 GMT November 14 to0100 GMT November 15

Thll .,..,. r·s party is f9Orl!<)re<l .o..n byt"- AI.manc. ARC IK. £G). T "", sam••t.·tlon can be wor.lKl on • • ch band. c reseb.nd .nd r. pe aler ccetects are nOIPttrmlllad.

EXCHANGE,

RS{T) .nd NC coun ty or ARRL secttce .

FIlEOUENCIES:

SSB-3960. 7280. 14280.21380, 28580CW-6O .Hl UP from low.". ba n<l edge.

NoviceiTech-2O .Hl up I,om low.".band lKlge

SCOIlING'

NC atafiOn' counl one POin t per 0 50. nd mul tIply tot.1 by s um 01 ARRLsection• .

Otners counl 2 POln lS per NC ccntectand mult Iply tOl.1by nu mber ot NC ccunlies wor.ed (100 m• • .]. Add a bonus of 25poln ls for wor.lng the club station, K.EG ,

AWAIlDS:

Tn. lOP sco 'er In and ou l of st.t. will raC.,.... the t963 Callboo~ of hisl her choice.Carto/,ca l•• 10 top acoretS in esch ARRL$6Ction.

EN71lIES:

5er1d log s and . ummary Slleets Show,Ing .ssent i. 1 d . l.n. to: F, R. AShl.yWB.M, 2731 BI.nChe Dr.. Burllngl on NC27215, tncruce I. ' g. SASE lor rnulls .M. iling eeeenre is December 13th.

TRINIDAD AND TOBAGOOSO PARTY

Starts: 0000 GMT November 20Ends: 2359 GMT November 21The 9V. OSO party hn been org.nlllKl

by Ihe T" " idad . nd Tobago Amat eur R.cro Society. I"c. , 10 comme mora te 20years 01i" depe" deN:e, 5 yeara as • ,epulllic . and 50 yea rs ot amaleur ,adlo , Use.1lbands trom 10 Ihrough 160 mel." onSSB, CWoor via sal. lilles .

EXCHANGE;

Tne us ua l 5· .nd 6-l lgure ser l. 1numDe'Ilgnal rePOrl pius • p<ogres~v. 3-dlgllnumber st.rt'''1l wllh 001.

A WARDS,

A eertrucate will De awarded to IIny stetion wor.ing 5 or mo'e 9V. or 9Y5Qstalions .

ENTRIES

Logs must s how dlltert""e In GMT. sta-

tion worklld, a nd number sent/ recei.ed. ItIs r.quested that. re mltt s nce of $2,00 orIRC equival.nt be InCl uded wifh your iog Ityou ,re eliglbl. lor.n .ward. Entries mustbe POStm. rked no 1. 1. , th.n December21.t .n<l .ddre.sed to: TTARS. PO 80.I 167. Pori 01 S pa,n. Tlln,d.d . WI.

LETTERS

Tommy Au..e..Boulder Clly NV

. " onmenl bu l . Iso pl.ce ou' inner IHe Ino rd"" I lind best·selhng au thor VernonHowil rd 's boo.1I very he lptu l in th ISrespect. Mr. Howa'd tellS uS that we haveplayed a wrong note tor so long Ihll t wehave lorgon en whal Ih. right note shouldsound like,

US Ing negative ions 10 enr ich our a" "100% prilc liCill. To combine such SImpleand he lpful prOjects on Ihe pracl,cal level"" t h in ltmse ob'Serv."OfI Of our inn.r prl)cetlMS wou ld 'ead 10 ben", und.,stand,Ing of both worlds .

Keepup thl!ooo<l wor. I lOOk torw ardto....ery lS$ue

INNER PROC ESSES

Tile .ddress you're iooklnp lor is BDXS.8347 W, 611' A _e., Lak.wood CO 80215.(303j-233·433S, - Wayn• .

$IV" /f ,. n ,,,. Pflrlecl·bmdmIJ Ity". IxIl lh"mllm ,..son lor chllngmg .... s our rr!emph' s,s on construcI,on ."'c les. Thesaddl.·st" ched magazme I,es 1,., On /heworkbench lor rea ding or bUJlding, whilethe oertecr bound s lyle Ilops 'tself shu t allthe lime. I've been pushing Ihe fun ofbIJJ ldm9 'Jad'J"'S for 0 _'" 30 Yllars nowand I don 't mt"nd ro SlOP, CW? The onlyrhmg / h.... IIgamsf " 's "s bemg man·datory, I.m convmced ,,,at I I wemllee ,, .m."tH 01".m p"d. .... ..OUI(1 h."" mOreCW r". n IIWIr . "'any ".ms ' re obS/mateP«JP'. "••m•....IS /Ong as '.mloreed todO som. ' '''''p tfrey C' n go '0 hllll. call JtV.nkee P/lfV8rseness. ' f )'Ou I,~ .,

It IS entoy.DI. to r. ad l uCh. pr.ct ;.c.1a n<:l in tormatl . e .rt 'CNt as " Electr;.c Health.', Neg.li.... Ions" by M,ch. e l W,n<lOlph(Jul y, '62). I . spec ially lI . lKl tne II!ns lblestat.m.nt, " Know wI1al yo u are dOIng andDe car.ful!"

I ",anted to bflng up a s ide point thatmlghl b. 01 Interesl to you r ,ead.rs. To alarge exte nt. w. ha.e becom" s o II CCU Stomed to h. rmtul envl ronman lS tha t wehav. lost to uCIl with our orig ln l l. inst inc·tive in t.lhgenc., It can De ,egainlKl by p• .t,enl . h.rd. • nd ded ,c.tlKl WO'k , bul iIdoes Ia.e t Ime ,

To IU lly reg"n our Inst,ncU.... inlelh·genc" to k no ... when somelh ing IS wrong.wa mU'1 not only adjust our P!'IySIC.1en-

I GEARVAKf II I I c. n·1te ll you ",n. I . pi••san! SU'pflll!,. ...,J . nd Ih ,, 11 11 was to 'ead th. I Tile GEAR

VA KI Bu/le /", h.d been MIa<; llKl Ne"' '''''I.' o l t"'" Mon lh lor Aug us\. Jn g rai llyl"tl10 .now that OU ' " peculiar brand 01 ma<).".U" la app'8Ciated by yo u lol.a outth.re In tee re• • wor ld of .m.te ur radioPubliShing ,

Tha Bulletm. 01 cours• . IS II laborof love(we sure a s M il don' l m.ke II ny mon.y.IItl, If had its beginn ings D.ck in the dIS'tanl PIISt when m~ co·conspirator••nd Idee ldlKl that too mllny h.ms. ham organi·lahons• • "d h.m publicat ions te nd.d toI••, th"m.el..... much 100 seriously. WeltarllKl 10 PO.e fun .1 lh.m-and ou r·H lv.s_througll the Bulle rrn .

We recognll. tl'l . 1 tt>er, la iI serlOVlside to .mat. u ' rad l(!. Dut T" " GEARVA KI

Thll nh. Tom, I don "''''in~ I pe l to II ,.,,,m·I. st at w/lic" someone does,, ', pus'" me tope/ Ille Anci" llI Avialor arlicl"s by mylalller illlO book 101m, OUlboo~ dMsion Iswor.ing on IlIls, altllou9h "d Ilk. /0 f1"tO,ld /0 write morll abou t SOmll 01 /1111 rimywork wlliell weill on durrng tll ll "me liewas slam ng ' he f"" tranSlttl"nl,c "",i"eHe 's domg well ., 86. s~nd"'p ,.,. If Of ,., 'SI,me '" no,,""" H . ... H"m".I1"" ""a h. IIIn HllW Vor. He ,.. l/y slloul(1wrrre morll.Tile U ddle S/, /c ll"'g is " lillie less .~".,..

bu t I have enJoylKl most of Ihe photo cceers also. My 1.VQ<lle was probably lheChess board fnilde up of vacuum lubesbac. a rou n<:l 1967.1 cece suggesllKl. cce .". piC ture 01SGulptu'. made Irom u.e jun.bo• . Vou dId Ihat. few yeilra ago , too . I'mnow woflc ing on. chess game I,om lohd·s lilte ceveee.

Anolher pOSllIve comment . No o t ~.r

m~gazine I hllve ever seen prints such ane.cellen! mi. 01le tters-pro ~nd con-nom. tt e r whal th e SuDjeef.

Finally. I was very I!kC ited aboul theBra,;;e OX Serv Ice ("L. n ers." July) buI no.ddr.ss was glv.n, I WOU ld like to pas.th,S info 10 some S1ghHmp."lKl Iflends,Could you plene publish ,11

Tom Grabo"'l kl K3SPVa . lll _ MD

FEEDBACK1 1I . now you lI ke teeclback. so ""'r.

comllS' 10ng-IIOSloon+ct len ef.I Sllil belIeve your m.gazlne is the best

a ll·aro und ~am PubllC' Iion. bulthe COS! 'Ssl .'I,ng to concern me, vou neeeln 't defand It 'gai". I'm tU lly aware Iha t costs areco n lin uall ~ II s ing. However, Ihe saeldle·s laple bInding or me Ju ly. 1982, ed itionde t,nitel y uoset me. Is Ihere an art ic leshorlllge? Or are coslS th.I h igh?

Spea.,ng of artici... I h.d II fllw 000ClIdeas to r snort arlICI... bul I fooled.round ."d someone De. t me t o t "",pun(:h- Ihrtll! t"n.l. Keep lI"coursglngUII 10 ", rite . Even ShOrl .rtlcles are .I""YII

Inl.resHng i1nd oll.n use luLI parllcularly . njoy those . bout ha m ra·

me history a nd electronic nlslo ry in gen.r.a i, I r•• lly tc-ee t hai s.rlea you , dad wrot e• f.w y••rs ago, Is It aval lilble In boo.to ' m? By t he way. how Is the oldg. nl l. m. n?

In detens. o t yo ur te.llngs llboUI Ihecoo. test. lhe J uly issue p'o.es yo u h....nolhlng .g"nSI CW. Ilound Ihe art ic l. SO<lIsentlKl • f'es h .pproach to $Ome oldg.dgllli. my 1'VQ<l1e part Of ~.m radiO.

Incidentally. I prel.".,.e<l lhe tilble o t content l cover when lOoking up old .rtiC ies

=

Bulle/ In g ives people a c llance to la ke a

"I,me oul." W ,lh Iom" e" fund s and " ' SUl

til/lIon. we"1I con l'nue au' period,C w aCk,·

ness as long as poss.Dle, Your ' ''''OIlnl'lion hn gIven uS a cnaece to;nc.eaSftau,,eade,shlp $Orne. and perhaps mome<!tiln'y lognten the 10_ of aUf btothet and

Slst.,.. hams. n helps us. 100. Ea lllng me

pape<,sre.'the<apy'Anyway, on tl<H>eU 0 1 Dr. Fel.. A. One

hunore<lIOtl, Or. Elwood P, lIShnus, Dr. Av·

'uell U Hil' tI'S/'le, T,·Grace GatlOOrl, LelahLIlah lowlou. and I I>e ,est 0 1 It>e GEAR·

VAK' 'ullng mob, llla" "" Irom U'e botloms01 our "'aIDed lillie hearts.

Joe Ven tola. J•. K80MZEd ilOf

Til. GEA RVAJ'" B,,"el'nEno" O H

FIe Mr, Riche,dson's leller in Ihe Augusl73 a bou t rude tende nc ies in ham equip.m ent salespeop le:

I was lorme rly employed w,th one of the

la'Oesl ham equipment dea le,s in the US.arid I'd I'lave 10 sa y that whal he says IStrue 10 a certaIn e.,en,. But gi~e lI' e gu ybehInd Ihe counle, a brea k_Ihere a'e ale w leg" .mate ,easons.

F"s!. the lale$guy 's ma k,ng a btg~"hce 10< '''' $ake 01 hIS Job; he has p,obably gl~en "'P be,ng a n aClive ham. Youcan't l-'k. Ih.nk, and eal ham radIO all dayand go on '''' .IIr ... ller wo<l<' No wa y. Yougel burne'll QUI soone< 0< later. Secondly.' I w" my e.pet'ence thaI the a mount 0'imm",'ur., ru"" .....ds.s d.sPfOPQf1lQnalltIy hIgh," I". ran kS o t ha ms a s "<Impa'ed10 1I>e geneoal popu'allOA, Woe 10 lheulea.man WI\O SoOkl a guy an HT mattweakS all", ... w_ '

rye I'I~ a o",y Ih ,eale n 10 k.1I me 10 ' rlt' ... s,no 10 ,etu'n h IS money on a detect ,yeI,anseel ' '''! II yo... take a ,adio In ' 0 ' ser·y,ce man y tImes. yo... ·11 gel incessan t caliSaboul ItS s tal ... s unW Irs Ii_ed. as it ,nlgel Ii_ed lasle ' wll ile tne se' Yiceman ISbusy o n Ihe phone. So many l'Iams go ber·ser~ when tl'ley don't ha.e thei, da ily rad ioli_. you WOUldn't be lie.e It'

Yo u see g uys come in, ciamp a pa i' 01head phones on and space ou! Jor hour sIis ulIl lngto the Yamaguchi on d ,sp la y",ilho u! s pe nding a d ime. Ho", m any busi·neSses ",o uld p ul up w,th t hai? If yo u pchle iy lell Il'le m to lea . e, Ihey get mad a snec k, He y, ",nat can y01l o lhe,wise do?

Fina lly, Iended upgett'ng p,etlyda,ne<ldl$gusled ", .Ih the technical ignorance 01many ha ml otrare. We had 10 w"eoorens0 ' m,ke pl"O$. ".,en 10< EXl ra-c la SI haml.AS a 5&IMman. you ......e e .pe<;led to cons tanliy gl'" &<h,ce on IKIW 10 hang an,en....s, rINd an s .... bndge, 0< zero-bea t a CWs,gnal. Tha l' l t,ne 10 a C8fta.n ..tent, Dot

Roy H, WilkinsonBlOOminglon hl N

NO THAN KS

Roy, the place 10' your lIam ads ,s m aham ad pape', nOl • maQa,me. II ,a.esabout ''''ee months 10 pr"" a ""m ad in"magazme and b y Illal r,mel"e stull,s usu·a lly sold, The ham ad pape,s gel Ille adsout there", a couple wee~ s li nd do a fIIce10Da/ II. I really ha le 10 la l<e br lla d out 01Ihe mouth 0/ small enrrepreneurs by compet"'g wJlII 'hem ,n 13, so I urge all read·e' s to use lIle spec,ally publ'calions and. eep Ihem heallh ,. I " ,sh ",al OST wou lddo Illat. 100. You 'll nOle IlIa' ..edon', Iry,ocompe lI' ..,Ill CO m"'Q"z"'e ...nd Ihe" soecral"fNJ co.era911 0/ con'eSlS. S...re. ",elelI,e only a couplllihoosand h.ms .. IlO .reser,ously ",'e,esIN m conlllllS. bul,hose..1l0 are Ihoo/{J INd lind support Ille pUI>

I,calton dfNJ'eJ/lfNJ 10 ,nllm ..1l'Ch IICO. I don·/ .no.. " "a , ,o UyaoauI,heun,9,a'e',,/ c,e'",s ../10 9'" hlliP and IIl~ saynolh"'g.-W,,~ne

Vince S.. lIo WB2FVZIlion NY

Just a sllor t note 10 Ilale that I haye.o~e' a pe'iod 01 4 or !lor 6 manlMa, helpedupwards ot MI haml and Otl'le<l Ihroughyou' "Ham Heip" column Ipll'tocula,ly onolder 'ace,Yers. Iransm,tters. etc·l·

Sad 10 say. only about 8 l'Ia.e "en botl>e<ed 10 reply and tllank me. 0< at teastlellme 10 "get loll '

KInd 01 makel you WonOe<

1 1

Tile 5ep,embe, 'SSIl& ..as P.lIc~1Id ..rlhRTTY good,es. and~I m. m.... ,1 _ffle"If cl".'rro CO"'. pIlr4Is"J ,Il., I ,"",I< til.'Ille f",'ule of hamm"'Q " "fNJ '" .. ,'Il dIQ',. 1commun,C/I"ans. and ,Il...t 'I RT TY. j

..ani '0 publish artrc~1 on h'Q"III andIlIQhe,·speed d'Q,'.1 commufllc.,tonS. on<trfO!'correc''''g code systems. on ...... ,0ma"c relay"'g, .nd 1-0 on. II enooQh o /uscllip in (pun). perh...ps we can S., UP lome"" erna"onal rela y sys,"m "'" te" ..,II be 01,mmense yalue '" eme'QenCI"S. We mlQhleyen 'h,n l< aboul an OfQanrZIII,on ..Il,chcoufd b e carred Ih" I",e",alfo".' Rlld,OReflly Leagu e' The mi"d bOQgfes, Any·",ay. glad yo u enloyed ' he ,ssue. and yes.....1' ./1 be ha.ing alaI mOrfl interesllng cons t fUc t ion p,oiec ls .- Wayne ,

issue is a n ind ,ca l,o n 01 beuer ham ,a ·d,o arl ic le s to come

No",••J yo u co uld IUSI come oul w.,h abloc kbu sle, RTTY ,nuellkeyoudlda COU'pie ot yea.s back!

LAID OUT

PRICED OUT

Vo u, ne w Coye' lay01lt 10 ' tt>e Aug us tInue 01 73 Maga, "'e IS gre.l Plu$. I..a s glao 10 see Ihal the arhclea. "'eremore ,n hne Wltl'l Ihe 13 ct a coupleyea,s aQo . I was ~mnl"ll 10 ...... myOOUblS about 73. as me a"lcles nemed10 be getting a",a y Irom ham 'edoo __...hat. Hay,ng been a subsc"bef 10 13 meKceSS ot le n years. I hope ''''' AuguSI

Tnese da ys. masl counl"lIS. Pllullcula,·IyCan~a. ha'lf! seuOus money ptoblems,Dul ........ in our poor econom,c COI'Id,hon..e nay&O'1 tJeef'I ,eouced 10 tile po<nt

wh-ere we haye a n o lllc'al h·cent co,n, know lhe I,ue . al,.. at ou' penny may

nol e""" be wor1h ~alt 01 US 'ace value.but " ~med yery 'unny 10 me to see onIhe covee a t your Aug uSI. 1962. ,nue a2f>3/~ S, I haye a mucl'l belte< batllng aYIIf-Ihal Ihe puce ct Ihe maQUlne wa s punIer:! ilQe WIth Ihe .eade'l 01 Popuiar Elecl'on-as S2 49'/. c- 'cs "Ope,ahon AIIIII'" cotumn AII-O. I

E,I"e, Il'Ie p,oolfeade, m,sseo ,I. 0' you m,ss your .....anl adl" columnl

ha .e eeecee 10 p,ml a n errOr del.oe.aleiyto see how many people ,eal lY read II"t ,om co.e r 10 co.e.·~ \: le-

.. I '<I.lr 1,~\ \. tln'Vc~U leY· V E 3MYOP'l J Ale.a nd , la , Onlarlo

We have an opening /0' a new p rool'ead'er, . ,lIn y 'al<ers?- Wayn e

..a m is 10 0 ha ' d , e sP&C ia lly tho se ...hOCla.m to De Sk,lIed e no ullh 10 pan metecno.car por110n ot the h tra ·c lass e . am.I wo uld like 10 ha ye Ihem la ll< to Ihese IWOllulS a nd lhe o lhe, 4Ol)-plus'll'lO<JsanO I,·censed " a ms ac,osS tt>e Unrted Stat".

In clos,ng. il Ine no-code hcen.. is ap",oYed. ' he only people who ...,11 bef>ehtare tile 2·metel-n g manutactur...s andtlKlse"'ho dOI'l'l really ca'e enDulln aboutl'Iam ,aolQ10 la ke lhe I,me to Ie...,n one otlhe moSI ,mparlanl anO USlllul aspe<;ls 01amateur radIO, ,CW,

Willi... m F. Bow......." "'''4UFISlaunlon VA

We rt. B,/I, ..ha l yOIl say .... "UII Ih"'yy....rs aQO ... ma~tJe e...n , ..enty rursago Bu' you 're so ou t 0/ da,e w ,' h CurrentI<IC/molog y lfIa, I do n ', . now where 'asten. ApPllren lly you a,e una ware 0/RTTY, ..hich has been afOund lOf well o.er30 years on ttve ham bands. You seem nOI10 I<no.. about recent de.elopmenrs suchas Inlegrll'ed clFcUlls. drg" lI t e lec I,omcs.and so On. Yes, in 'he d ays 01 spa r• . every·Ihlng you 've written was "u e Alas. wasl, 1I haye a surpris ing number 0 / hll ms",hO a,e liYlng ,sola led '" /h e Old spar.dars.- Wa yne

1 1

1 1

KEEP THE CODE

In ,espanse 10 YO'" commenll ...bou th.....ng a no-code hcense. I was under the,mp,esslon Ihal amale u , ,ad,o ...as de.eI·oped '" to prOYlde a yo lunla ry, non·com·me,cial eeo-ce Ihal p,oy"jes to.- emerqency comnwmcaucos. the adyancemenl 01Ihe st a te 01,ad io a rt. and a t'ained pool otope ra lors. teChnic ia ns . and el ec tronicse.perI S!97 .1 ,r"

We ll, II seems 10 me tha I if we a,e tolo llow th is nne we should go o ut 01 o urwar al nce nsed hams 10 he lp people eecome tra ined ope ra to rs 01 CWo As youwe ll know, CW can be hea,d whe n yo icecommun'ca t,ons cannot be coeerercceBec ...use 0 ' Ihis, c w can be ulillzedmuCh mo,e etJ ,c ,enlly duringeme'gencys,'u.1I0ns,

I leaCh a t Ine Vi,g.nia School Jo.- It>eDea l and Blind in Slaun ton. V"gln,a T..o14.ye...'-okl g"l s. bolh .isually impalled.passeo bot" pans 01 Ihe " OY'CII ,equ ,,1tmenllthil yea' and reeelyed thell celllel·te<. IKB4AHA a nd KB4AGll. Fo< Il'IOse...ho tHllhall1'le CW POI1ion Ol lho Noy ice

P.S. Please Wltl>ho ld my name trom pnnl. Im,ght dec'de to go bac k inlO th e n ...m busl'nen alter a iL {Where's m y ya humll

By Qol/y, you 're nol Iry,n g 10 ' ell ... s IfIII Iyou Ihln l< Iha ' I< nowlng Ihe Cod" ,s,I" 1111Ihat's needed? All Ih ese ne rds ",ho h,HeDee" dflYInQ you C,a ly have passed IheCOde test so wlta' are you beeling " DoUI'They may Itave an EXlra·clas s lice nse li ndbe a b le 10 copy code al Iwen,y per, DurIhe y can'I w"e II mll<e prug, eh? Well.Ihal"s wha l mOSI hams wa nt us 10 hay".my '''en d, so SlOP bee/ing Until I set!

some Bas h bool<s In sh,eds a' ham s,oresI w,'1 conllnue 10 Delle ye Iha' maS! hams00" 'I wa '" anyone 'a . " ow lI"y Ihea'y,0' Itow 10 bu,ld e yen Ihe s,mplas' 0 / Slul'

or '0 I< no .. o"e end 01 an antenna /rom'he Olnlll. You, custome, Storlel IIr" ,he

sam. as I'm nea'lng /ram a ll o/ 'n" nllmfHalllll. r y. IH1ftn pusnlng lor II cnllnge"0m depftndlng on Ine damnfNJ CQdtI'O a'HI lecnnte...lleSl. not /I BasnHl oM..."h no no"CNb~SUCCe'SS - W...yM

so many ...ou ld n·l ta ke Ihe li me to p,c k u pa n a nt e nna manual 10 find oul. eye n 10maybe lea,n w me tl'ling . Why'? II you are10 dam n la.zy yo u memo'~ed Ihe BalhbookS ~o gel you, license. yOtfre notaDoul 10 read tt>e ARRL a nt &O na bool< tolea,n IKIW 10 cut a dIPOle (...h ,c h youSI'lO<JIO n..e kno...n how 10 00 in lhe I"stplacel. No . keep lak Ing It>e easy ....y GUIand alk tne ,ao,o shop guy.

So, aher all tl'l" a nd more. iI I,ncereguy0< a De1l'nn,"Il ham mlghl come inlO a ,a ·dlO SI'>Qp and jusl m'lllll ge l a 1,lIIe SIlOft·I''''hed So<ry. guys.

Name a nd ...Od,ass sub mitted

1 1

1SACRIFICESI

RTTY LOOPMarc I, Leavey, M. D. WA3AJR4006 Win lee RoadRandallstown MD 2 11 33

One 01 Ihe queS1lons ,aised a lewmont"s back regard<nlllhl! design 01 a 'ad,oleletrpe ,eee,,,, p'ogra m ...a s how 10makesucl'l a rece;"", Imm""" 10 ga'baQII 0<noIsy Slgnai$. ThIS monlhl"ll la ke a Ioot< ...,

one lechn iQue which ca n be used 10 o.e,·come s uch a pro ble m: mult iple s a mpling

Recal l Ihat each oe te pu lse in aflO· wpm Murray cha' ac te'. 01 w~ l ch tn e rea,e t,.e. las ls Jm 21 ms. Mechan,ca l te le ·p,,,, ' e,s do nol use I ~ e e nli' e pulle, bu trather a small sample 01 it. Whe re Ihisl ample w.ndow is pos,'.oned dependslipan Ihe adlustmenl 01 Ille range seieclor ThaI 'S. only a small Sloce ot each

(\.lI la pulse 's ",ad m o,de, 10 delerm.newhelh...- Illal pulse 's a ma,k 0< a speceF.g. 1 sho...s ho ... IIl.s ...,nOO... oyerlapsIhe long...- d al a pulse. S.nce mechanicalpunlers lime the '"Intra·pulse'" ,nle..al' ,a m Ihe posi tion at Ihe w.ndo... on Iheda ta pulse, adyancmQ Ihe wlndo", lowardIhe beginn ing ot the pu lse "" il enable lhene xl p ulse to be ,ead Ihat moen eocneran d ca n al low speeds s llQ hlly g'ea te,I~an 60 wpm 10 be ,ead II is by using th islechn lQue that so-caueo "56' lpeed "' maoc h. nes can be copied on an otne rwrse un·mod.hed Model 15

In a n analogous la sh,o n, simpie RTTY ,...ee,... prog rams s uch as loose <lefIc"be(Jhere ,n lhe pas l sample eacn da la"",lse 0n

ly once a nd use Iha t ,n lo<matoon to ,econ·

slllJCI lhe MUffa y characler. W.1Il t... 'aulines presenled a le w years ago, tor example. a momentary sample hom It>e m.ddleat eael'l pulse was obla"'eo A llelay 0' 20ms belween samplel kept lhe w'ndows po.S,honed near the mIddle ct eacn dala pulse.

The d,llicult y Wllh such a scheme is lhatno.seor lad ing can d lSlo,t ind,,,i dua l pulseswithin a characte , . m us c ~ anQing the mterpreta lion , A simple so lution Is 10 look ateac h pulse nol Jus l once. bUI severa l times,a nd base the decision 0 ' ",hat 10 call Iha tpu lse on the Sum 0' tho se samphnQS. Regula r samples Can be take n at. say, Iwo-ms ,nte.-yals 10 p'oduce a I""e SCheme such ass!KIwn in Fig , 2

Ha••ng sampled eacn "",1M many limesand p,esuming we Ila... Slored t!>al ",to<,

116 73Magazine . November,1 982

95

WORLD TIMEWATCH

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10 timer. Se-cond. reo"dout.Bright BLUE . 8 In c h dlglr• •

The HAM-' functions include local t ime ,world time, IG.M.T . too) count-up andcount down chro nometer, day. month,date, alarm and hourly chime . It's idealfor log-keeping, OX ume conversion and10 minute 1.0. timing. The HAM- l teatures a high contrast Seiko display andsolar cell battery ass ist . Battery life isbetter than 4 yeaTS. The HAM-l is waterresis tent to 20 meters, t he case is 100%solid stainless steel and t he crystal i5scraten resistant mineral glass. The HAM1 is rugged and durable and has 8 1 yearwarranty.

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I EXPERIMENTER.....~~;J CRYSTALS

J (HC 6/U Holder)

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I0[5[jjJjJ1

CII. No. Specmu lion.0313(10 3to20 MHz_ For usein

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CONOITIONS OFSALE·Soldan a cas"basIS Shopprog and1X>SI"'Qe "'S/de U.S """ be prep;Jod by Inlemanona!ORDERING INSTRUCTIONS Otder bv catalog number,Enclose C hlK:~ 0< I'TlOt'l<'lV order w,t" Voor o!'de.FOREIGN ORDERS P"ces quoted tor US orders only Or.oers tor sNpment to Olt1er coontoes "" II be qOOled on '0'quest PrICes wbtecl 10 change ............... loretgn Ofde<",, 00

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providIng cscueron over a range 01 frequenciesby InSer!lng the desired crystal. 2 to 22 MHz.OF-1 LO, Cal. No, 035108, 18 to 60 MHz. OF-1HI. Cal No 035109 SpecI fy when orderlng_

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73 Magaz ;ne • Novem ber, l 982 117

" TTO DU~

f'g. I TI>" samp le w,ndowFig 2. CompUle,', mulr ,ple samp les

(>rU' ""'-5-1: .(C" V'D)

Isn co.-'.. TO ' I

I c, . .. .._ a..~ Ivat( CQu..,u<

I . n SO"~L' Ic"""". '0'"

I S"'~" '''uf IJ.

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I ,""., ..... ' I<.~c.

I o,c., ..,.., I$."'" COV'"

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'-',............. u' ""'.. "n U ' ''''0 IOfU • • •r

'0 .. .... c"U&('"'/.,I eee.. ..I .. ' I

I" <"""T!." ." U I.ULH I••~c , "T J.'/

TO <.~C .

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'''''0I on.. OU ' I '/

O' CH'. ' cr • • -r..( .." . " ...ull )

C" " ,,,'" C• • •• o,,")

DX

mallon in some usable lo<mat we mUSInow decide whal 10 do w,' h lhal ' nowl·

edge. Unless ''''' e,,<;ull tieIng monllored ISan atlSolul ely clea, etIan",,1. II IS doublh.1

1"'" an I.... (,n th,' f!>amplej samples w,1I beICJeOlocal. In lIle case 01 pu,e I'\OOM, 0I'Ie

""llht e.pect an a_. 01 hall mafl< andhan space, $0 a Ih'eshoIll wouklsee<n ap.

PfOp"ale to adlud,cale *'>en 10 call a g,...",pulse "marll." ...hen "Spllce:' and~ 10Ihro... +1 oul. For wanl ot a ooner sugll"s,I+o n. leI' s setue on seven 0< mo re .empleso ne way 0' me ott-er 10 laOOI a state. ~ead'

ing less Ihan seven p uises 01eilhe. mar . Of

space will ren<le. 1M ir>dlv,<l ual bil l rashSo you have a l raMl pulse. no... what? It

WOUld seem thallhfl<lI a'e alleasllwo waysto oeal "'!lh Ihal EllhIIr you a. bo tra" ly .....sagn ,t as a mar. or spacage. no? In or"'"to .mplement t""', all you wOU ld need to do

IS """'1' traell 01 IIow many bl ts you havelead and dela y whaleve, IS left to get 10 l hene.' Sl op b, t

I don 'l IIno w how eon lus ing Ihat all iswhen you read It II waS nol aillhal clear Inme wfi ting I thlnll lIlat FIg. 3, a Howeha'l 01w!lat I am tal ll ,"O atlOu1. ...,11 help clearl lttngs up. lhough The character rec"PtlOllroutrne IS .....""ed Wllh a bll counl",,.,, atlive, u", numbe< 01pulses on a Mu......,. d'\a',

acl.... Alte< detecllOll 01a s tafl PIJI"'._·tlORal counl...s lor mar ' ao<l space are leIup ar>d CleafllCl A loop ISenl...-ed to sampleeach pulse len tomes and 'eglsler l he Slale

01 ''''' pul se sampled In the approp" atecoun ler All er l en samptes have been lalleo, the eounle. s a,e examoned to dele,mrneIhe probable rdenl i ly 01 th e pu tse am] .e·cord lhat on Ihe cceect pos il ion . Assumingall has gone well l hus l a, . Ihe sampling prl>CHS is 'epealed lor ..ach 01 lhe I've dataDoIS. and the Murray chiU3Cler transm,u<K!1$ reoxwered

Howeve<. ...!'ral rIa Do t rS In "'.or? What I

!'rave d"ecled ~e 's 10 Ifa\h the en"',e!'ra'3Cter, We do lhal b)' branch,ng loa rwIrne """OCh wail S OUI ''''' remaln'ng blts'

c noa Harris VP2MLBox 4881Santa Rosa CA 95402

THE TOP TENW hat afe the Top Ten ? No , nOI t ile beSl

selhng roca.aoorcu reco rd s, bullhe mOSIsought-aller count"es In Ihe OX ",o rldE.ery year 11>" OX Bulle/m surveys the lOPOXers In Ih ls country and ol he' count"es10 dete.mlne ...hlch coootnes are moStneeded. TI>" DX Bullelfn eeoc..ntrates onllIose OX",s ...Ilh mo'e Ihan 250 COUOl"es..orked and ,s t"" mosl ",es trglOlJ$ 01 all

lhe bollehns. Its Top 73 IrSI 's '''''' mosl

tome ...-.d then e.,ls wrlh a ....1. lor "'" teo

ceoved CI'rll'3Cleo- One presumes thaI "'"t'anSllfllOlllletletT>e used wrlllQf'lO'e SUC1I aCl\araCter

complele and w..I~.espeetell 01 any SUChlost rn lheworld Some amateur ."dro manulactu....s dele,mlne ...1Io will rtlCe'~ OX·pedrtro n "gs on ttle bas,s of th,s su"".,y.The OX Bulle/tn rec;enlly g,anle(l pe.mlS'Slon lor Ih,s column to rep,oduce lhe 1982li st oll he mo st nee<le<l counl "es. Here '"Ihe lis t. w ilh comments on l uture a metecrradio ac trv ity , IFo. l urt her inlo rmalio n o nThe OX Bul/elm, w. lte 306 Verno n Avenue,VenlOn, Connec lrcu l 06066.)

I, Ch,n" B Y. China tops ....eryone·s mosl

...anted IISI, w,t h almost no 1II9ll' amaleu.

radio sm.:e " '" earty 19501, Bul lhat '5changrng fsee th,S COlumn. July!. MOff' BY

st alions a'" CQmlng on I"" <l<r, and BY

Th,S type of SCtletT>e 1$ uselul lor ... r......

nalrng eo'oneous Characters w~e "'" er,'or rS gene<a,oo bet_ "ansmrssoon and,ecepllOll. Fo< those ",'ors generaled on

w,l i move down l he mo st wanted li st in lu·

tu re ye ars. Not rap+d ly , bu l ' II Will s lo w lymove do wn unlil everyo oe !las Wo,lI"d BY

2. V/(IHeard. Th ,s I+ny 'ocII near AnlafC'lrea wrll hOSI one 0' I WO major e Xpedrtro ns 'n 1963, W atch Hea'd d' o p com·plelel~ ott t"" moSI wanl <K! IrSI ""xl year

3. VUJL ..ccadlw"s. The onty rs.and ...orlt.Iandon9 on on InlS a'ch,pelago IS IIIe base01 constdflrable p"ale aelrv'ly. No , not .a·d,o p"a les. bul real Me prrales whO dOn' Ileave hve wrctrms. No one rn h.s 'igtll mrndgOtls anyWhere nea' tee reeeeeoes

4. AID/M '. ZA. It's tne poh trcal climaletha i lI" e ps amaleur .ad lO ou t 01 Alban,aAs One 0111". poo.esl 011he Eas te rn Eu.o·pean cou ntrres and o ne c lose to Ihe Sov i·ets . A lban ia has l aoeo a d im VIew 01 ha m.adlo lor years, The,e are s'gns o f a so i leOlng 01 Ihrs a tt i tude, hOweve., and .u·mo's ccourwe to lIy c t a OXpedrtron 10AI,ban,a any d ay now Don't hold you'breatn. bul cIon' l llesrtalt to work any ZAyou mrghl""ar.

5. Cambodrs XU. Polrtre,,1 tu.moil and

Itle o pe.ator srde 01 the oeyboard , yo u areon you, o wn'

TurnIng 10 t"" ma,ltwlg. Il\ave a note ""rehom Leo f . MeA ut'''e. J. 01 Astltan(l.MassachusettS, wl>O 's a Short ...a.... I'Solen... rnleo-estell rn COPY'''O RnY Leo rS IQOI<r"O tor a oev,ce wtltCh ••,,11 drsplay rec9lvedRnY on a TV sereen. ...rlhOul navrng 10 rnvest a 101 01 money Well , leo. as. you may1>8.... apprecial<K! rn IIIe pages 01 adS tlere,n 73, ' ''''re rS not a 101 on Ihe mar 'el to dowhal you aSIl , Tho se unitS thaI a,e eo mm...c laliy avai lab le coSI sev,."al h undred s o t(!Qliars. whrch yo u ,nd,ca te rS oul 01 you rrange. I m ight suggesl l WO poss.bre atternat ,ves. One wou ld be to sccct the nam·lesls In your a'e" 10< an older. used, videoRTT'I unll. such as lln old tJl rc .oIog recer_Tt>ese were mllde IOffIe years bllcll llndSlM:>ukl tie lu.n'ng UP lor reasonable proces

on l he l lea·maollel e"eu'l. "'nol her ..,." IS topul logel """ II smalt ""., yoursell. usong aOed,caled computer. COSlIng u"""'" $100.and an ASCII VIdeO d,splay Such d,splay"ma y be otd lermrna's Or recer ve d iSplayboards. none 01 which snould cost 100much. Fo r some time and elbow grease,you may 00 QUlle happ y ...rth whal yo u wrl lcorne up w,th. IT lhe.e IS sutt icient mterest. I

...ould be ...,l long 10 ...or ll O-Ulltle desrgn otsuch a unll. lei me ~ no......,tn, as I""y usedto say on lhe tube. you' <;.I,ds an(l len...s

Among ''''' ""... a",."ts lIe.e al WAJA,JRIS llnOl ...... earnput.... an Atan .tlXl. I bougflt

II lor lhe k ld.._bul you kno... >O'ho IS llt "'"lLeybOa'd more an(l more. I am rmpressedb~ IIIe prog'ammllbo hty 01 th.s unrl andhope thaI we ...rll be able 10 use rt on hamradIO. I 101,11 lleep m y eyes open lor applICatrons, and I hope you do. 100. I 10011 lo'ward10 sharing wrlh yo u whal ever we all ca n d'Sccv... ,n lulu'e co lumns.

Nex t montn. SOme mo,e onvesl 'llatloosrnlO the oesrgo 01 Ihe roeal RllY te,mlnalp'ogram. as ...elt as a 10011 al wtla t someof you are sa~rnQ W,nle. rs a g'eat Irme

to ...one in t"" snac '. even 1tI0ugn I""senew lfans,StOflleQilC,zed ..gs don t pulOUt lhe h"al ot a pa.. 01 801s. lei'. seewhal orno ot Ih.nQ. we can do ,n ne.trnonlh's ~TTY loop

c,.,t Waf prec lud e ham ,ad ,o l fOm Cambo,d la , Ol li eia l pe.m lss ion rs unlrke ly In Ihenear lu l ufe; we 'll JUSl have 10 wa ,t uOlriInrngs cai rn dOwo ,

6. $ou 'h YBm"n 70 A Slmrlar case 10 AIban,a Soulh Yemen ,s In the Sovlel camp.and they don't endOrse amat...... rad'O

7. Bouwe/ 3Y ...no, ...... tiny rs.and nea'Anla'C1lca. Boo.'" .....,. occasoonal lour·'Sl llnd scoenhhc l rath c . Pe,m,SSlOn I.omNorway can be obtarned. and Boovelmrghl well be a I llrgel ot a OXpedrlron1OOf\. bUI p.obably nOllhrs wrnler.

8 Andamans VU. AI leaSl One amaleu,IS t,sted as h avrng a nceose for I he Anda,man s, bu t ael ivn y h as been no n·e ",S lenlThe IndIan ru les preven t OUIs.ce amateursI rom gen rnll llcenses. and lhe locals don 'tseem 10 Show enough inte'est ,n ac uvat.inQ ooe 01 " , .. rarest 01 a ll O)(CCcounl"e.

9 Bu,ma XZ T"., ollrc,al Bu.mese gov·ernmenl says "No" 10 llny amaleu, .~ro.an(l lIle ARRL , ..Iuses 10 accepll"" ope<'"lions I.om It>e '",ebet" nonh haU of tee

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q"ency t..p alo the bogInnl14l of ..,,11 <raruImlB'610n ....d. low bMp &1 u.. en" V'I'\U&lJy . Um ,·...._ ·-t.alll -over'·, 0p<Pta_ for u p ", one yeuOn a .,~ 9-V t>aUety 'not au ppll801' CAn be<1,""", ,n l<Orfaced I<> An, u.n-,..... . I» ch ..• .,.., II, poundmlt:!.hoI P'l"I' It... ,..,.. I"I"f lineool~ m uat be p<»11.l...... "'" ".... 0l4n 24VDC. 1>01'" u... eurnmt «reu« \I>uI 100 """ ,_ o , h . ,Ul ytr\u&Ilr &II~n ...... You 'vehelt.N It. now you e&n r.a... n.r"

"BEEPER III"

73 Magaline • November,1 982 119

A gagg le of F08s. D,d you work 3 FOB staf ,ons on Iw o dUleren! bands dUring tt' e" TlUraicelebra/ion July 14-2271/ SO. you qual"y lor a special award. bu f you must reques l /heaward be fore the end o/Ihe year 15 acllve fOBs made more than 5000 0 5 0 s dUting thecetebra/lon . fF08G M p~oto courtesy of WB6G FJ.J

country . ThIS pol it ical mes! Shows nosigns of beon g straighlened ou t ,n tbe

ro.eeeeeere future.10. San Felix CEfJX. Getting a li cense is

tri vial I I have onel, bu t gellIng ooto the IS·land is im possib le. The enllfe island is amili tary base ( I i ~e Aves on l he Ca"bbean)and "g"ngoes" are nOl welcome. Even tneChileans have been unable 10 con. incethe m ilitary higher·ups Ihat thev mean noIlarm in thei r p lanned DXpedllron. A re·cent "operal ion" from San Feli x turned m·to a Irasco wh en the Chi leans claImed Iheoperato r was nowhere near the is land atthe l ime, ThiScould Dreak al any time, DutI ,ale it doubtlul,

The main difference inlhis list from aSImilar one twenty years ago IS in Ihe rea·sons for lack of ac tIvIty from a country ,Twenl y years ago l he reasons were phys i·cal inaccessib ilily and lacl< o f t ransporta·tlon and accom mod at ions in the counl ryu's hard to mount a DXpedi t ion w~en youIlave to pac l< your gea r, genera tors. andluel in on camels, The transporl al ion pic,tu re has changed for the bette'. and nospot on 11lis eart ll is out of reach of a de·lermined amateur.

Bul the pol i tical rea lities ha'e changedfor the worse. Cerlain cneere and r-acesm Ille last 20 years and increasing senstt lv i ty 10 teelings in deveioping countriesha'e led to a more lormal approach to thedocumenta tion needed for a DXpeditionto " counl" to r DXCC. The conservative ettuuce 01 the ARRL DXCC stall means anamateur cannot SImply opera te from acountry; he muSl be welcomed by Ihatcountry and opera te wit h the" lull cooper ·ation. ThIS is sim ply ImpOSSIble in manycoun tries. Many emerg ing counl"es arereluclant 10 put any /hmg down In wriling,allhough they are eager to gIve verba i permission to opera te,

Another reason for Ihe reluclance o fcounlr ies to permit even viSit ing amal eurstooperate is the fear 01 spying, internal re·Vall , or ou tside l akeove r, a ll of whIch re·qu ire rad,o communrcations, Unsoph,st l'cated customs offic ia ls cannot dl ffe renli·ate belween spy gear and a TS·830. IOnsecond lhought, are the re any rea l dI ffer.ences?) So it is simpler always to say" No" than to see i f il is pOSSIble to say" Ves."' We probab ly won 'l see I his aliII ude change qu ick ly. Only patient oemonstrenoos and years of support cocumentaucn. and ass is tance Will win ji t tery gov·ernmenlS ove r to the value of amateur ra·dio, as we see happen ing in ChIna

W~al does thIS mean lor the OXer? 11you wan t 10 gel on the Ho nor Roll ihavlngworl<ed almost all the DXCC counlries).you must ha.e pal ience. It may be manyyears bel ore we see SIgnificant rad io op

erat lon s lrom many o f the Top Ten.H you do hear one o f these highly de·

sired counlries on the alf and are fort u·nate enough to work il, the bat tl e is onlyhalf over. Now you have to get a OSL cardto prove you wor ked h,m,

OSLS AND OSUNGThe re is more to OXlng than worl< ing the

OX station. gelling the con fir mation of theconl acl can be every en as ch allengmg asbreak ing through the p ileu p, Bul a fewhin ts and suggestIOns Can substantiall yImprove your OSL pe,centage and gelsome of I hose coveled pasteboards "onthe wal l ." '

In th is lirSl part of this senes on QSLlngwe will conside r lhe care i tse lf: Ihe serection, design, and prin ting of your own a SLcard. In future columns we wi ll adVIse howto 1111out the card. how to gel the card 10the appropr ial e p lace. and a SL Du,eaus,

Vour Personal OSL Card

The re are no rules requi, ing that aC~now iedgeme nl of a DX contact must bein lhe form of a postcard,slled paper. aSLmeans ac l< now led gemenl of a contactnot a special card, But ever yone wh oseeks Ihose ack nowl edgemen ts uses tneuniversally accepled aSL card. in moreI han 100.000 requests Jor my aSL" . I havene.er receIved a requesl WIthout suc h acard, Only a tiny handful have been otherthan postcarc.s.reo. So while there are noforma l requiremenlS to r the dimenSIonso f the a SL. I recommend st,cl< lng 10 thestand ard l or mat

Choo.ing Your CUd

Given the tra nSlenl natu re of moSl DXOSOs. l he DX SIal ion has li tt le opporluni·ty to gello know you, If the a SLlng ts nandied by a a SL manager. the person fill ingoul your return card will I<now even tes sabout you. So your aSL card reHeC1Syou rpersonali ty and amateur rad io imeres l seven more tha n your DX contac t.

When l he l ime comes 10 c hoose youraSL ca rd, you l irs t have to decide on acustom card or an off· the·shelf comme' ·c,al card. There are dozens at commerC ia laSL card prinl ers. MoSl o ffe' a sel oj samp les and designs tor a nominal fee. Once

upon a tim e l he aSL prinlers wou ld obtainIhe FCC list of new licensees and sendyou a set 01 samples and order for ms 00·fo re you even rece i.ed your license! vcowere SO pteasec to learn your calls ign thaIyou im mediately ordered 1000 01their fan·crest cards . 950 o f Ihese are proba bly Slillgathering du sl in your basement

The advantages o f commercial aSLprint ers are many, They produce a goodlooking card at relal ively small expense.The card Is easily recognizable as a aSLand il is printed on stoc~ heavy enough togo through the mai l as a postcard. Pricesrange upward from a few cents a card.Vou can selecl Irom a oowi ldering varietyof cards , incl ud ing mult i-colored cards,lwo-sided cards, and more. Orde ring yourcommercial aSLs Is trivial ; You p ic k yourdesign. fi ll in the blanl<s on Ihe form, andsend in you r money. VOl' wil l g el yourcards bac l< in a few weeks-longer if youuse one o f the smaller prinlers .

Bul for DXing. slandard aSL des ignsha.e one maior disadvantage: They are al llhe Same, NO, not identical , but an activeDX station who receives tncusancs ofOSLs each year will have seen dozens Orhundreds of similar ca rds. Val" card willbe one of the pac k; il won'l stand out.Some hams lry to make their cards standal'l by USing bright orange aSLs Ihal glowin the dar~ . l stili S88 spot s before my eyesfrom open ing an envelope wilh One ofthese Day·Glo orange aSLs. But I heve received Dunches 01 these, too. Certain aSLdesigns are so popuiar Ihal I have rece Ived hundreds of cards idenlica l exceplfo r the callsign. Needless 10 say. I am notinlrillued to receille yet another one Of lheSame design.

This doesn'l mean tha t standard designaSLs end up in the c ircular lile. 11 justmeanS lhat they gel answered just likeany ot~er aSL, no l asl er or slower, Tilecall and tile individual operator will not beremembe red any leng th of lime

The cards (and operators) who do stickin Ihe mind after Ihe aSL Is answered areIhose personal cards. cards wh icll saysomel hing aboul the ham and hi s stet-en.

II you do decide on a commerclally-pra.duced, slanda,d aSL card, there are a fewIhings 10 ~eep in mind when making yourselection. First . avoid commerc iall y-prlrduced tWlrsided ceres. These are thecards with the personal informlilion onone side (ca llsign, name. and address)and a standard aSL form on l he reve rse.Why avotd these? The OX sl al10n muslf irst find your aso in his log, This meanscomparlng the time of the aso on lhebacl< o f the card and Ihe calls ign on theIranI wil h hi s pages and pages of log.Sometimes the card must be f l ipped several nrnes betore Ihe asa is located in lhelog. Then , In orde' to fill out the returncard . the OX operal or musll irst record lheaso Inform al ion and then turn the cardover to gel the callsign. Bi g deal , you say .How difficull is il to turn the card oller?Flipping one or two or ten or a hundredca'ds is no big deal. But when you dealwilh tnccseocs and thousands o f cards,the OSLer SOOn iearns 10 dread the sight01 ano ther two·sided card

rwe-etcee cards also lead 10 possibleerrors on your return aSL. In the processof Hipping the card, the OX sl aHon mighlforget the call . or transpose two retterselC. The resuU might be a aSL card Whichwil l be rejected by the DXCC cneceers.

This does nOl melln lhat a ll lwlrsidedaSL cards are useless for DX purposes.The re is not hing wrong with a card whichhas the call and name on one side and theasa inlormat ion on lhe reverse, es longas fhe ca/lsign also appears on fhe feverse, Tllen the OX slalion(oraSL manag·er) doesn' t have to fiip the ca rd; the call-

sign Is right tnere on the reverse with theasa inlO/mallon, But few commerC iallyavai labie lwlrSided cards ofler this c plion. II recutres custom prinling of bothsides 01 the card , greatly InCreasing thecosts. and eliminatin ll manyof the eec oomies 01scale o f aSl printin g. So II you intend 10 do a lot 01 OXing, st ick wit h sing lesided aSL cards.

Anolher thing to cnecx when you purchase commercial cards is l~e 1l10S8y l inish. Many 01 these very handsome and atl racl ive fill ishes will not abSO/D in~ lromfe ll tip pens. Tile ink puddles up andsmudges off, Hard pencils may make averY li ght trace on some coated cards,Test your sample cardS with your usualwriling utensn Does lhe pen ma~e a clear,c lean impression which doesn 't 8meaf?Nol all shiny cards have this problem; youhave 10 check the sample.

Another possible prob lem with commercial aSLa is the use of strange typefaces. Some amateurs choose an exotictypelace lor lheir calls ign and address,one thlll is di f ferent. on the hope that 11will mal<e their Slandard card moee crslinclive. Don't ! These weird typelaces areo ften dilficull10 read, Typefaces thaI looklike script or bfush euceee are espeCiallydilliculll0 read, What difference does 11make , you as~? It your ca l'silln is difficullto read, the DX stalion might get it wrong.Then he mighl nol find It In lhe log, or hemightli ll oul youf aSL to someone etse'acall! For the same reason avoid trioseubiquilous si lvllr-on-bl8ck aSLs. They arevery ditlicuitto 'ead '

Custom aSll

I personally prefer custom-designedaSLs, bOth to send and to receive. I feellhe aSL card Is 8n extension 01 your amaleur radio personality, and it should saySOmelhi ng abOut you and your amateurCareer. CUS10m·deslgned aSLa need notbe elaborate or expensive, and the init ialellort qu ick ly pays 0 11 In imp,ovedreturns.

Whal should go on to your personalOSL? Make sure you ha,e the basic inl ormat lon; your calls ign, name. and addressmcluding cou nty, Vou will alSO needblanks tor lhe aso in form ation, If youworl< one mode or band predom inantly.you might want to customize the QSO in·for matIon , For exa mple, 11 2O·meter enthu·Siasl might have " Freq. 14 MHz 'Be sure to say lhat Ihis card is a confirma·lion o f the a so descr ibed: man y commer·c lal ca rds omill his vit al line

I have used both the box fo rmat and asentence lormat lor the aso in formation.and I def ini tely recommend the form erThe sentence 10f mat li,e.. ' "This confirmsour 2x__aSO on __ 00 __""'

" __UTC, With your signals _RST."') is cumbersome and ',ery prone 10error . The bo x format is ciean and easy tolill in and read. Amateurs seem to be ableto m ake the sim plest task complicatedand So produce a bewildering number 01com binations of Ihese aso inlormalionboxes . For cons ls tenc v and 10 ass isl theperson l i l l ing oul lhe ret urn card, I suggest the 10ilow ing fo rmat Call slgn, Date.UTC, MHz (not ban d). 2X(mode), RST. Ifyou are design ing your own card fromscratCh, be Sure to leave enougll space ineach 01 the bo xes for the r"'1ui red Infor·mation, In ol her words. the boxes lor thecallsign and da te 8hould 00 sUDsl anliallvlarger than thosa for the ol her information. Better yet, take a blanl< aSL WIthwe ll ·designed bo xes end steettre format.

Anolher importanI i tem to inciude onyour cu Sl om aSL is a request l or the DXsta tion's ca rd. You wou ld be amazed atl he number of aSLs 1 have rece ived wit h·out such a reqvest Since I receive and

120 73Magazine . N o v e mbe r , 1982

MFJ.260

In cludeshigh q ualitytransform er

oil ,

SWR/WaltmelerHF-

MFJ·262

MFJ

Tune up fast into 50ohm resistive load.Extend life of finals.

New MFJ-816 low cost HF SWRlWanmeter for1.8 to 30 MHz ranQe. Torodial current pickupgives uniform senaifivity over entire HF frequency. Read SWR, forward and reflected powerin 2 ranges (30 and 300 watts) on two color scale.SO-239 coax. connectors. 4-1 /2x2-3/8x2-718 in. '

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Charge VISA,MC. Or mail check , money order.Write for free catalog. .... 47

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Quality 50 ohm non-inductive resistor,011 cooled. Includes high quality. industrial

grade nanstccrner oil (contains no PCB) .Low VSWR to 400 MHz: Under 1.2:1, 0-30

MHz. 1,5:1, 30-300 MHz. 2: 1. 300-400 MHz.Ideal for testing HF and VH F transmitters.SO-239 coax connector. Vented fO( safety,

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...See List 01 Adve rt ,sers "'f1 page 130

•

send thounnds 0' n ,d, 'nch ~U' . I dono l answ", n .ds t"''1 don ', haYI' tpet;ilIe request lor my card; I . s s" .... ,,.,. Cl rdil I n . ns ..... 10' card I sent. By!!'Ie ....Y,.woid IhoM cu te OSLa willI l ite OSO in lo<·

ma"on hidden on • dr....ing 0' • fi ll. • ' C.Anyth ing Iha' m..... ' ,.,. aso in lorm. Honna'd 10 lind Of declpne, ...,11 SlOW up you ,'tow,n card

So much 10' the nuts and boilS 0 ' aSLcard des ign, Wh" 'DO",! tr'll ove.lIllock7Wha t personal ;" tonTlation will customizeyou' aSL7 A photograph 01 you,sell I t

yo u' ope.allr>g po l ltion with aSLI end' '''' rd s in tt>e t1eekg.ound N yl mor'..t>out yOI.I 'twin an y .moun t 0 ' , • • t . A

good photograph shows you . ~ulpmenl.

st l tion I'youl, you, mosl p",ed 1...l raS .a nd (Vefy imQOrt I"t) I OdS • laee 10 r oo '

call. My 'l itO"" OSLs to ' ecIIY••' . de' i·n,tely photograph IC OSLs. beeause t t>eysay so much abo,,! the o pe.a to< * ,\ho ulIi stl"" hund.lICI. 01 . ward. no one Ilas""e, Ilaard 01,

Tile major dr awback 10 a photographica SL la Ihe considerable Init ia l expense.Bul lf you can find a fri end who w ill l ake agood black·and-while pholograph, youcan aaya a g.oo<l part 01lila eoat Tllare Isusually alleast ana good pllOtographer In.....'Y rldlo erc e,

Wllal abOill IIIUng you' equipment and

anllnnal on Ihe OSL? EYery time I ha...do... lilia, • Ila... ellangll(! tlla gear astoOn aa Ihe ca,da coma beck f,om Ihapr inter. If you "alle YOU' equ lpmenl regu-larl y and 1'Y w anl."n.. _ry Maaon,you allOu ld I lila II111ng of gear all lilacard . If you are ..,Iafl ll(! wltll you, COllinagear and Big Bertha, by all m&ant II s1lilaaQulpment ; the OX stallon la alwaya In·lereatad In knowing wil l! p,oduced Ihl!strong algnal.

Once your card la daalgnacl, Ihara '.malna tile choice of how 10 prlntlt. Someof Ihe OSL p,lnle,. will produea a customcard f,om YOU' Ikalcll . bul '.P"CI 10 pay101' Illai, MlMelt. I praler tlla Qulek-orlnlapp,oaell , as I uaually pr lnl many

t"Ouaanda o f caroa at a l ime. and lilaQu lck-prlnl sIlopa ....111 produce a card IOfIe.. than a pa nny ap iaca. I proYldacamer.,ucty copy and Itle printer print.foo' carda on M ell sr-I of P.par andcul a tllem In lo OSL-lited card• . (Post .1sa...lee ,aqulrementa Inalal on a cert. lnm inimum Ilza fa ' postcarda; eheck Ihla!)elo,e you hlYe the carda trimmed, AIIOmake aura you' card will f ll inlo a alandard amall any. lopa wlt l'lOul fo lding.)

What""e' fo,mal 0 ' Iype o f OSL e. ,dyou "Iect. you ItIII hayalO 1111n oul P'Op.erly . g.111 10 lroe ccnect IndlYldul!, andgel Ilil card back. Wa' lI d lweull I I'''''01...... atepa on OSU"1l ln ful ure /TIO'I11l1.

2H K9LJP 258 JF1CPH 17e II EEW 192 WA W OH243 HI3LRB 2~ JJ 1KTl 117 W3BHM 193 KA2JJK

AWARDS2.9 W9CC 260 'IE6CNV 178 AL70 190' JR3LVI2!>O ZL 1SZ 261 15HOR 179 PY2CAR 195 JF1CPH251 KA9CEJ 262 PY2RAN 180 PY10WM 196 KAI)M MO252 ZS8XS 263 KASFLE 181 N.CXK 197 PAQTP2~ ZS8XK 26. PY10WM 182 TU2HJ 196 JJ1KTl250' PA;np 265 JF1SEK 183 KA 1RC 199 PY1BVY255 PAINEM 266 JA5MG 16<1 JHTOFH 200 HI3AMF

GLADESPEDITION cia"," I'IoOla. Iha Ilead of a !lor", w ings ". wscc 267 KC6A U 185 F'Y2FK 201 F'Y2RAN

Tile Fort M't'I" AmallU' Radio Club will of a bal . and tlla fo ...ed lail Of a d 'agon. 257 F'Y1EWN 266 N6GBM 186 HI3LRB 202 JH3QHO

ba condUCl ing a ·' Gladu pedl llon" 10 Wilh lOud raucoua cftea., II f lew UP tlla 187 ZL1SZ 203 JF1SEK

GI_S Counly, Florida, Oparll lOl'la ....111 CI'I lm"'Y and InlO Ihe h.." 01 l ila Pine- SOUTH AMERICAN AWARD 188 W6U IJIP 2O<l JA5MG

tllg inon N""""beI' 13, 1962. W.LX will bit landa. ApPNrancas and Ilghllnga ecce- 186 N5CSW 211 F'Y2FK '89 ZS6XS 205 KC6AU

opar.t lng In lhe Ge.....1N1ndS, tlCth CW "".n lodly. On H.IIo....een. I tle WJRA will 167 KH6KU 21 2 K9WP 190 ZS6XK 206 N5AUB

.nd SSB. Some Noyice conlllCII will lito mainll in a ..diOYlgll, Irylng onea ag.in 10 188 K9RNR 213 MI3LRS 191 PY21EIJI lOT .X.OO

be made, II you need Glades Cou nty, be c.pture • g llmpslI o f lhe Deyll. Will Ihey 18i1 WN5MSS 21. W[)9AOCSu'll 10 look lor Ihem, aSL to: Oay ld 1'0> see him? Gly,lhem II eall _ W2JUG _ and

'90 OA'AS 215 ZL1SZ EUROPEAN AWAROKA8CXO, PO Box 051131. nee FL 33905, gel a f lrst ·h.nd tepcrt . 191 VK3BM A 216 KA9CEJ 251 W08MAI 282 N7CZHSASE please. 192 WB7UCU 217 ZS6XS 252 W7GLU 283 N5AUB

73 MAGAZINE 193 .Z.VG 218 ZS6XK 253 OE3SWL-OWZ 2e. TU2HJ

45th PARALLEL AWARDS PROGRAM 1~ PV1BVY 221 W9CC 250' OE1·11 1060 285 Ml3AMFWORK THE WORLD 195 WA9AHZ 222 KAI)MMD 255 OFSVO 266 F'Y2FK

TIla TrioCounly WI,eless g 'oup willm i n ~ 196 WTGLU 223 JF1CPM 256 WB7UCU 267 KA5BO'"OX Irom Gaylord, lJI ,ch igan. on lila .51h 97 WD60FN 126 WB7UCtJ 19T W8UIJIP 22. W1SIX

25T VK3B"'A 268 I(2YOFpa..11eI lhal lway between l he eqUllor and 98 KN.F 127 KA3FUU 198 VI(2F'Y 225 F'Y21EIJII tle tlOI'1h pole} l rom l ol.OOZ NOY'IImber 13 99 WA2WRO 128 W[).&,JEO 258 WN5BIJIS 289 JA9AXS/l

199 VK30XY 226 PAI)TP 2509 VE1YX 290 PV2SZKIhrough 0600 No......t>er 1• . Phone only II 100 N8B Dt 129 W7GLU 200 n WXY 227 JJ 1KTI3.925. 7.250, 1• .300, 21 .375, and 28550. 101 WB9NOV 130 VI(2PV 260 K9RNR 291 K9 WP

201 N5AUB 228 ZL2LOCertificale lor OSL .nd SASE 10 N&COY 102 KA30BN 131 VK30 XY 261 KH6KU 292 Hl3LRB

202 N7CZH 229 KA2JJK 262 N5CSW 293 W[)9AOC103 K9GHf' 132 KB2WH 203 N.CXK 230 6P60VII).( W9YBV 133 IIWXY 263 KH6F ~ ZS1SZ

2O<l Al lY 231 JF1SEKABC·TV 105 KA7GIN 13-4 K3WUR ~ 11WXY 295 ZL2LO

205 KA1RC p2 JA5MG106 W6HTM 135 KA1RC 265 VK3DXY 296 KA9CEJ

The ABC·TV Wash inglon Enginaering 206 PY2CA R 233 KC8AU266 KA7CPZ 297 ZS6XS

Group. celebrating the lirst year 01 opel a· lOT N6ATS 136 PV2CAR 207 W3BH M 234 N5ACU 267 HZ·16260 298 ZS6XI(lion 110m Ihe nel ....o'k's new W.sh lngton 108 KC5TK 137 11 EEW 208 11EEW 235 VE6C NVnews bUleau. Will be on Ihe all Sa lurday , 109 K3STM 138 KI)LST 268 .W·16260 299 PAltTP

209 KIILST 236 N6GBM 269 VK2PY 300 F'Y2IEMN.oyembe, 13. hom 1ol.OOZ 10 22OOl, on 110 9GIRT 139 HI3LRB

210 HI3A"'FSSB f,equencles (plus 01' minus S kHZ): "1 WA2LYF 1.-0 ZL1SZ 210 OE2AB'" 301 WA2FYW

T. 2.5 and '.285 Ind on CW lor Noyoce 112 ZS6ABA 1. 1 zsexs 271 K9LST 302 J RTICNASIAN AWARD

. nd Teelln,eian conllC ts on 7.1251"" .... 113 VI(2HD ' . 2 ZS6XK 272 VE70Rt 303 JF1CPH

11. VE3LVN 1 ~ F'Y2FK "2 N5CSW 163 F'Y2FK (1 . M Hz) 3001 WP.ATFing II .5 m,n ules pasl e. c h hOUr).

1U JF1C PH 1~ KH6KU 1&l1 NUKO 273 VE70RI 305 JJ1KTlKB7ZZ13 ....,11 also be on 1.5. 190 I'M 115 VE1ACK

1" W1GLU116 F'Y2BTR " 5 W1SIX165 HI3LRB (21 "'Hz) 306 VE6CNV

(W300S/Rl th,oogl>oul the operat,on pe,,-1"6 PAIITP '.5 Wc.JEO 166 ZL 1SZ 27. 11 EEW 30T JA5PWW

00. Spec..I ....nl. OSLa y' ll buslI>es..a,ze n7 VE3JPJ1"6 WBTUCU 167 ZS6XS 275 W3BHM 306 JH3QHO

SASE to, Sleye "'a ils KA.ORL, 2520 116 HC2RG ,.7 JJIKTl119 WA91VU 1.8 W3BHM ,n 'IK3B"'A 168 ZS6XK 276 PV2CAR 309 JV9CW

Heathcli ff Lane, Reston VA 20091.120 VK2 NHV 149 JASMG '.8 OA1AS 169 PAIITP 277 KA21AL 310 JF1SEK

121 KH6KV I !>O JF1SEK149 AK1H \70 J F1CPH 276 KA1RC 3' 1 JA5MG

JERSEY DEVil STATION122 N~5W 151 KAI)MMD

150 WI SIX 171 JRTICN 279 KAIIMMO 312 NeGBMTha We" J..sey R.dio Amat.u,a 123 WN5MBS 152 8P6DV

151 WN5MBS 172 PY21EM 260 W82VTO 313 KC6A U(WJRA) will mounf a SllCOnd operl lion 12. AK1H 1~ KC8AU 152 11WXY 173 JJ 1KTI 261 N.CXK

from Ihe SoUlh Ja,My Pine Ba" ...... Ih... 125 VK3B"'AI~ KB2WH 17. JA5PWW

h.unl of lroe la"ed Je,My a..-i l. e.g.n- 150' 8P60V 175 OZ5EOR OCEANI A AWARD

nlng and end,ng at mldnlglll, t..... cou'" NORTH AMER ICAN AWARD ' 53 Vl< 3DXY 176 W3BHIJI .., "=W 1&3 PY2CARgeous WJ RA groo p ....ill attempl aga'n Ihia 213 N5CSW 230 VE70RI '56 HZ·I6260 l n JH3QHO 1"6 KH6KU 16-4 ' 1EEWye.' 10 operate Ina . nl"e 2. "Ou" 01H'~ 2,. KH8KU 231 I1EEW 15T .W_16260 17e HI3AIJIF U 7 WN51J1BS 165 KILSTIo....een. Oc tobe, 31at. A Unique, ha ne)- 215 KIRNR 232 W38H'" 158 VK2F'Y 179 JA3UCO l .a JA9AXS/l 168 JG10 LTsome ce"ihcat. angr. Yed with a tounl. 216 VElYX 233 F'Y2CAR 159 PY2CAR 180 KAOIJIIJIO ' .9 VK3"'BA 167 PY2FKnanc... 01lila J....y Deyll will !)IS..ettc all 217 WN SMBS 234 KA21AL 160 KA1RC 181 JF1SEK 15(1 WBTUCU 166 OZ·OR·1239aliI ions wo,ked whO send an SASE to 218 'IK3BMA 235 KA1RC l el 11 EEW 182 JA5MG 151 KA3FUU 189 N4AKOWJRA. PO Bo> 82, Bur llng lon NJ 06016, 219 WBTUCU 236 KAII MMO 162 KIILST 163 KC6AU 152 W7GLU 170 HI3LRBFreQuenc lea to be used are 15 kHz from 22<l . Z4VG 237 W051BM 153 K3wUR 171 ZL1SZthe bottom of each Gene ra l phon. banoj, 221 PV 1BVY 236 WB2VTO AFRICAN AWARD 150' VK2PY 172 ZS6X580 Ihrough 2 m,"rl , and '.6.55 I'M. Noy· 222 DE 1·1"060 239 N.CXK leo N5CSW 188 W7GLU 1S5 VK3DXY 173 ZseXKIc... OperatiOn will . ISO be 15 kHZ up. 223 W1GLU 2.0 N1CZH 161 KH6KU 169 JA5PWW 156 KB2WM 174 JF'CPH

The Je,Sly De. il was DOfn In 17~, a 22. I1WXY 2.1 NSAUB 162 K9RNR ITO VK2PY 157 11WXY 175 JR3LVI131h child. In tlla P,ne Barfens of Bu,li n9- 225 VK30XY 2'2 KA2JJK 1&3 WN51J1BS ITI HZ·I6260 158 N7CZM 116 JRTICNton County . t • place called Leeds Point. 226 .W-16260 2.3 HI3AIJIF 1&l1 0"'1A5 112 .W-16260 159 N.CXK In PAI)TPNOI long lilt.. III birth . on a log9Y and 227 VK2F'Y 2U PY2FK 185 VK31J1 BA 173 VK:lOXY '60 W1SIX 116 JA5PWWd'INry nighl so ulu...1in Itle P,... Ba"ena. 228 OE2ABIJI 2.5 I(2YOF 166 WB7UCU lH 11WXY 161 K3WVR 179 JJ1 KTIlila chlid ISsumed • ,.,penl-"~e body, 229 KIIL5T 2"6 F'Y2R....L leT 4Z4VG 115 K'LST 162 KA IRC 160 W3BHM

122 73Megezine • November,l982

DIRECTION FIlYDING?

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(Reflected, 4140/400 Walls)Dimensions: 165 x 75 x97 mm: 6.5 x 3 x 4 in.Model CN·720B (New 2 Kw Scale)Frequency Range: 1.8-150 MHzSWR Detect ion Sensitivity: 5 Watts min.Power: 3 Ranges (Forward , 20/200/2000 Walls)

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73 OX COUNTRY CLUB AWARD (SSB)

73 OX COUNTRY CLUB (MIXED) AWARD

22 W85LBR 24 NL7J23 WD6EEO 25 KA(,JMM O

73 OX COUNTRY CLUB (CW) AWARD

13 VE1ACK 18 4X4FU14 KC3W 19 PY2FK15 K(,JLST 20 PY2BTR16 OE2ABM 21 OF5UT17 K6FO

TO·M ETER OX DECADE AWARD

WORKE D ALL USA AWARD(15 METERS)

7 N40 H8 WB7VQB

WORKED ALL USA AWARD(MIXED BA ND)

68 KAaJTT69 KA2MIM70 KA8MVV71 N3CHN72 N3AKQ73 KA1HJK74 KAOMM O75 WB9UIA

(1980176 W89UIA

(1981)77 WB9UIA

(1982)78 VE6CNV

WORKED ALL USA AWARD(6 METERS)

10 MGOK11 W4CKO

WORKED Al l USA AWA RD~ 20 METERS}

14 WA(,JCEl15 KA40 0U16 KA9LYH

5 KA41FF6 WB9UKS

8 N5DDB9 N9CEX


5 VKlNBT 7 N4QH6 VE1BWP 8 N5CSW

54 N7CPE55 KA3GSN66 KA3FUU57 KA4VNS58 AG1P59 N8CJ F60 KA5EEZ61 KA7JNP62 WA91VU63 8F'tiOV64 KA7CPZ65 AK\lG66 VE3JPJ67 HC2RG

11 KA9JOl12 KE7C13 KC4YY


4 WOOBOS 6 N40 H5 N5AHZ 7 KA 1DNB

92 K88WJ93 KAGJTT94 KA5KOS95 VK2VVA96 KA4WBR97 KA8MVV98 KA1HJK99 KA9JJK

100 KA21Al101 WL7AHO102 PY2SZK103 KAGMMO104 KA1HFN105 KA9CEG106 KA9CEJ107 KA9LYH108 N8CYS109 WB9UIA110 NS4J11 1 VE6CNV112 KA2L HO

DISTRICT ENDURANCE AWARD

B XElTlS 12 SV1GJ149 mln .1 142 mln·1

9 K(,JWNY 13 OK20X152 min.) (56 mln.1

10 KE7C 14 KA(,JM MO114 min,) 139 min)

11 KA3FUU150 min)

73 KA lOJB74 KA3GSN75 WB9HPR76 W4PCK77 KA4l SJ

(28 MHz)78 KMLSJ

(21 MHz)79 KA3FUU80 N1BDB8 1 KP4FCK82 KA2MIM83 W lOWA84 KA2JM J85 KA7JNP86 WA2AKX87 KP4ERH88 KABCUS89 KMVNS90 NBCJF91 WOOEPV


7 WAGRVK 9 W4PCK8 N40H 10 WB2ZEl

CENTURY ClTIES AWARD

23 KC9CA 31 BP60V24 N8CJF 32 KAGMMD25 KE1C 33 WA6NIE26 AK0G 34 VE3JPJ27 WB7VBO 35 KA9BJ X28 KABMVV 36 KA1HJK29 KA3FUU 37 NP40Z30 OEBMOK 3B VE6CNV

7 W05JRG8 WA4ll Z9 WB8LSV

10 WB9WFZ11 W8AKS/a12 KA3FUU

1 WB4WREIM2 AC303 W5TJO4 WOOA VG5 OA2AL6 WB4TZA

SPECIAL TV COMMUNICATIONS AWARDCLASS A' WORKED All STATES

1 WA6VGS2 KE7C

0 ·5 AWARD Of EXCELL ENCE

61 N7CPE 67 KA5KKl62 N8BDI 88 KA9ENM63 KA 7EII 69 PY2UGS64 W8UPD 70 KA3FUR65 KA21DJ 71 KA6JQ B66 WB9KUV 72 KA7CPZ

OX CAPITALS OF TH E WOR LD AWARD

18 N6ATS 24 VK2PY19 VK2HO 25 WB3BVL20 lS6ABA 26 WB 2TOJ21 SV1GJ 27 PY2FK22 VE1 ACK 28 VE6CNV23 4l4VG

SPECIALTY COMMUNICATIONS AWARDCLASS A·I : OX COUNTRIES

9 K3WUR 16 N5CSWIRTTYI IRTTYI

10 WB2VTO 17 HB9MOM(RTTY) (OSCAR 71B)

11 PY3CJS 18 OE4HQIRTTY) (RTTY)

12 KE7C 19 VE20 0IRTTY) IRTTY)

13 AL70 20 VE200(RTTYI IOSCAR 718)

14 PY1EWN 21 ON4C MIRTTY) IRTTYI

15 OE1PBAIRTTY)

96 NR4S97 VK38MA98 W04J EO99 KC4YY

100 N5CSW101 4W18260102 VK2PY103 N2CFN1()4 W1SIX105 N4CXK106 lS6XS107 VE3JPJ108 1200l109 15HOA110 KA1RR111 WB3H TK112 KI2G113 0 E(,J OXM

(19791114 OElIOXM

(1980)115 OE(,JOXM

(1981)116 KA60117 OJ9ZB

186 JA5MG187 KC8AU188 N5AUB189 N6GBM

75 W060FN76 8P60V77 KN4 F

11979178 KN4F

11980179 WA91VU80 W lH Al81 K91ML82 AG7P83 KA1UA84 N6ATS85 KE7C86 KA3FUU87 VK2HD

11979188 VK2HO

11980189 VK2HO

11981190 9G1RT91 SV1GJ92 WA8KM K93 VK2NHV94 CT2CO95 HC2RG

181 VE6CNV182 JH30HO183 JA3UCO184 KMMM O185 JF1SEK

OCEANIA (Conti

Amateur satelli te Re ference Orbits

SATELLITES OSCAR 8 RS-5 RS-6 RS-7 ns-aDate "~ '" "~ '" "~ '" "~ '" UTe '" Date•••• •••••••• •••••••• •••••••• •••••••• •••••••• • •••

". i aer a " aBB8 '" U57 no U91 an ~113 m ,a 8817 aa U02 ass 0141 '" U SI no ern H . aa aa 22 er 81 57 no a 1 26 raa 884 2 '" 9128 H. ,

N.. t Na .... '" Time Freq . ( MHz) • 08 26 ea U 51 m U18 ai s 8B32 aea 8125 aae •• • • • • • • • • • • ••• • ••• • • • • • • ••••• • • • • • • • • • • • • • • • • • • 8au .. aH 6 m 8855 m n 22 '" 8122 aze ss 8a 3S es a141 m 8840 ars n 13 ". U19 '" s

East Coast ",. HOO East .. rn 3.850 , 8839 as 8135 m 8824 ar a 888 3 aes 8 116 aaa ,Mid-America "" Hoo Ce nt ral 3.850 a 8843 " 813a m n89 no 8153 n. 8114 '" eWest Coas t "" aooo Pa c if i c 3 .950 • 8B4 8 •• B12 5 m 8152 m 814 l '" 8111 '" •He" Yor k City ",. "00 Eas tern 1 44.400

" U S2 es 81 19 aae 8137 m 91 33 aaa 818 8 '" "Goddard Center ",' Hoo Easte rn 14 6 . 835 U 8 a 57 " 8 114 aae 8 121 '" 81 24 aaa 8 105 aas U~os Angeles "" aooo Pacific 14 5 . 88 5 ra 81U " 8109 aae a 1 86 no a1l4 an 8102 no r a"' '"" rooc

"~ 3 .780 B alB 5 sa 8lB3 rae 8858 aaa 8184 no 8859 m BI n ternational '"" "00 "" 21 .280 U ai i e .. aesa aaa 8835 no 88 55 aas 8857 '" UI n t e r nationa l ' 00 "00 "~ 14 . 282 rs U14 ss U 53 aas ~a 28 m 8845 aaa 885 4 aas rsEur ope a n '" rooc "~ 14. 28 0 i e 8119 se 88 47 '" a884 aa i a8 35 m 8851 '" i sESJMnol '"" 1900 UTC H . lBO

" 81 23 .. aa 42 ras 814 8 ". 8826 no 884 8 no "ABU/Pacific '"" 1100 UTC 14.l0S re a 1 27 .. 8a 37 aas 8132 ,.. 8 U 6 aas a 845 an reSouth hcific '" 2 200 UTe 28 .878 rs 8132 ree 88 31 aa s 8117 ,.. eaes H . aa 4l ara "South Mric a '"" 0900 UTe 14.2 80 ae 8136 '" 8826 aa s 8181 '" 81 56 ". a a u aaa aeSEASAT '"" 1300 UTe 7 ,280 ai 8141 '" 882a no 884 6 aas a14 6 m U37 aaa "Australian '"" 1000 UTC 3. 680 " U8 2 " 8815 no U ll m 8117 as a Ul4 '" "Ne" Zealand '" 0800 UTe 3 .850

" U 86 " 8818 no 8815 m 8127 as i U 31 m "Table 1. AMSAT ne ts provide up-to- the-minu te news about ama- " uu .. U 84 no 8B8a aaa 8117 aee U28 aas "as 881 5 er 81 59 • 8143 ,.. 8188 ". U26 m asteur sa tellite developments. as 88 19 ea U 5 l i 81 28 m 88 58 ... U23 are "" 8824 ea 814 8 , 811 2 m U4 8 '" U28 are "ae 8 a28 .. U4 l , 88 57 asa 88 39 ,.. un aas ae

AMSAT NETS as 8 n 3 .. 81 37 i 8aH ase 8829 '" 8B14 ... "" 8 B37 " un , 8 a 26 ... 88 2a '" Ull ,U aeKeeping up wi th the latest deve lop ment s in the amateur space

program is as easy as tuning your ham rig to one of the AMSAT,"0 , 8 841 ee 81 27 z esn ,.. 8~lB ,.. 8889 '"

,nets. Dur ing these sess ions, yo u'll hear informat ion ranging from a 8 a 46 .. DI 21 , 81 54 i r 8 a 88 '" eees '" athe latest Phase III news to ti ps on when and where to work the rare , n SB se 8116 a ei as i r n 58 i a 888 l '" ,

• ee ss " 81 11 , 812l • B14 8 .n n 88 ,.. •satell ite DX. Techni cal d iscussion s abound, and you can usually s 8 a5 9 " 8185 a 8lB8 s B1 38 re 81 57 i s sp ick up the la tes t t rack ing da ta. Table 1 is a li st of these informa- s al B3 .. Bl 88 a 8a 52 • al21 • 815 4 is s, 8lB8 ss 8 855 , U 37 z 8111 • 815 1 "

,tive gatherings. • 8112 .. 8BH , BB22 m 818 2 , 8149 " •s 8117 " 8844 a n86 m 88 52 , 8146 i a s

" 8121 .. 08 3 8 , 814 9 " 8 842 s 8t H rs "PHASE IIIB PROGRESS " 812 5 ... B8 l 3 , 8114 n 8n3 • 81 n " "" 811 a '" 082 8 , 8 11 9 " 8823 • 8137 " "Summer wa s a ti me of fu rther testing and refinement for the " 8114 '" 88 22 • 8 ia 3 " BaI3 , U34 " "" 8139 '" B8 17 • 884 8 .- 8~84, n l 2 n "Phase IIlB satelli te, now tentat ively scheduled for January, 1983, .- 888a " 8812 , 88 32 " 81 53 " 8129 " .-

124 73 Magazine • November, t982

launch. Ac cord ing to the AMSA T Satellite Report , malfunctionswhich occurred in both comm unicat ions t ransponders during amidsummer thermal /vacuum test were qu ickly co rr ected by IheAMSAT OL crew in Germany.

If all goes as planned, Phase 11IB will fly aboard Ihe seventhlaunch (L7) o f the Europea n Space Ag ency (ESA) Ari ane m iss ile.The January launch date depends to a large extent on the success-

fu l launches o f L5 and L6. The former was scheduled tor early September and the tatter for tate November.

ESA's Ar iane i s now a head-on compet itor with t he Space Shut·lie as a commerc ial satell i te launcher. By means o f low prices. eovert tsements in sat eune Industry magazines. and o ther marketingtoots , ESA has bu itt a backlog o f more than 20 spacecraft awa itinga boost into orbi t.

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73 MagaZine - November,1982 125

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1983CALLBOOKS

Prices and Spec if ications subject tochange without notice or obligation .

Software copyright by AEA.

AEA once again breaks newground in the code communicat ions field with thenew model MBA·RC reader/code converter. The MBA·RCdecodes Morse, Baudot orASCII signals o ff the air anddi splays them on a large 32c ha racte r a lphanumer i cvacuum f luorscent display. Inadd it ion , it will output Morsecode for keying your transmit te r. It wi ll also generate Any(Baudot or ASCII AFSK twotone output. (170 or 850 Hzshi fts.) An y of the acceptableinput code s can be convertedto any o f the specified outputcodes (any speed to anyspeed). If you have any of thecommon Baudot AITY terminal s as an example, youcan now send and receiveMorse and ASCII with yourkeyboard and printer. You caneve n generate ASCII o rBAUDOT RllY us ing yourMorse hand key or memorykeyer.

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"126 73 Magazine . November. 1982

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QUoOe",,'labIe, n ,s complete "''''' inlormahotl atlOullea.ning Morse Code. hes lhe lal"lll FCC amaleurregulatIons and tile eun...,t FCC applicahon IOtms. Tn.s gUide IS nol a questlON_n.we< memonzallOncourse till! rathe< " ~'ll~ lhe Pfactocal SOde 01gellIng a IIam hc~nseand pullIng .. slato"" or'l ttlealf It refleCts wl1.llt the FCC e.pects a "'lWice 10 kl'W)w .,'!lOul page afle< page of dull It>eo<y. The mostCUff...,t informa llo n .1011 .~.,I.bie at IaSI j1@a(s pt;ce. SGl~l s.c .95,·• NOVICE STUDY r APES - it yoo are lust gell Ing 5taned ,n Mm fad'O; you"lIt,no ,Ile"" lapes ,ndlSpe<l sat>le' T",. up-IO-l!ll!-m,nule " 'VISIon o f 'lie 13 Sh>dy Cou'"" ,s Ill. pe,lect w. ~ to lea rn everything youI>M'd to breeze U,.o"O" \Ile N"",ee "'fO tle n eum T""",y. FCC regu latIons. and Op"raw'll Skills a'e a llce-eree. and yo u'll be amazed a t no w lasl yo u lea,n us ,ng reese tapes'

Once Ille lest IS bell ind you. tlle se tapes Willgo 'ig lll On bemg use lul , because they are pac~ed W'11l Ineia,eSl inlo,malion on sellIng up you' o wn na m Slallon, and ge ttIng on ,ne a i,

Tnolisand S 01 peop le have dIscove red no w ea.y lea rn ,ng lro m casse tte Can t>e _orde r no w and e nterth" I••c.na ling wor ld of ham ra dIO ' CT7300 Se t 01 3-$15.95 ·

S<;.OOlistS 11."", pro....." tll.1 you lea rn lasl l!! by hstenmll Ihan b~ reading t>e<;ause yOU Ca n play a ca.""'fie lape 0"'" an<:! 0....... ,n your spa'e I.me - .....er> ""rUle , ou're dm,ng' YOU gel mo<e anc more .nlo9iICllll~ )'OlI nea, ,t You can t PfOll'ess ....11>Ou1 50110 funOamemals. rresewee nour· longlapes g'""1'01> all me ba soC$you'll need 10 pass lhe NoIIICe e .am ......Iy You'lI Ila"" a n un l!e<Stand"'g 01me ba50CS "" hlCh ""," be Ihva luaOle 10 you lor lhe rest 01 , our life' Can YOU alforO 10 ta ' e YOUr NovIce e 'am"" .,roou, l11Sl IIs l00.ng 10 ,_ la pes?

" GENESIS"S WPM -CT7JO!>- Tn,s IS U'" tIeg .nn,"ll t_ IOf people.. IX> do <>01 know " .... cooe 011 a ll I1laoes lhem 'lVOUQhI"" 26 ~ll"'S. ' 0 numr-s anCl necessa.... punctu.allon.complele "" U' PfKllce ....1!!l' slep 01 the """yUSll'O It>e""....esl Diltz te.ch lng lechnIQue!i. It IS a lmosl m"ilC'ulcus' In one roou. man~ people - inc lud,ng ~"'s ot lena re able 10 mu!er Ille COde The ease 01 lea rnIng g .vesconhdenc.. to beg,nner s whO m lQnl oU·...' w".e d'~ out.

"THE STICKLER"6+ WPM_ CT7306 _ Th.S rs !he D,acl,ce tape lor lheNo..ce a nd Tecnnlc ian lice nse •. I! " made up of ooesolid hour 01COlle, sent a l me olhclil FCC Sla nCla rd 1110Oltle r lape "" e '. e neird uses these s la r'ld i 'Os, 50 manypeople flu nk Ine ecce ""tlen they are Suddenly_unae .pressure-laced "" ,tn c ha raclers sent al 13 wpm andspace<:! IOf !) "" oml Th.s ta pe is no.m"mOllzable. unl ,ketne l any 5 wpm lape. s",ce lhe Code groups a 'e e nl"elyrandom characl"'S senlln g'oups 01 lo ve

GENERALLKENSESTUDYGUIDE

Special Offer! Both Novice License Study Guideand Novice Study Tapes $19.95 Order NP7300.

GENERAL LICENSE STUDY GUIDEGENERAL LICENSE STUDY GUIDE- ByTimothy M. Dan iel NBRK Thi s is thecomp lete guide to the General License.Learn ing rather than memorizing is th esecret. Thi s is not a qu estion-and answer guide that will gath er du st whenth e FCC issues a new test. Instead, thi sbook wi ll be a hel pful reference, usefu llong afte r a ham upgrades to General.Includes up-to-date FCC rules and anapplicat ion form. Order yo urs today andta lk to the world . SG7358 $6.95

" BACK BREAKER"' 3 .. WPM _ CT13'3-Cooe g roups illa"'. al a bl'ISI\ ,.De< SO 1'01> WIll beit ....sewf>en you5l tdown In " 01'101 the,.,'-'I!!y.....ed~n..-l Inspect", anel I>e 51arts 5f'<>(j" 'll}'OU pl;o,n la"llu;oge ;01 0I'1y 13 pef You '-' thIS e,' rama'g.n 10 ove<~ ll>e pan", wt>"'" IS un, ,,,,,,., In lhetesl 5I1Ui !lonS W hen you "" scen t you< rnc)nejr anell ""'"10 l'-e lhe lest YOU '11 tnan~ hea-. you nao Ihls tlaClo.b'e-a"ng tir<'

"COURAGEOUS"20 .. WP M-CT1 320-Cooe 's wha l gelS you wile n you90 for tne E"ra ClaSS hcense. II is so embarrasSIng 10pa n,c out lusl t>eCi uSe you dldn' l prePire you rself wlmIn,s lape Tno ug n !n.s IS Only one wo'd l" sler . tile codegrOlipS are SO dlll, cull Ihat yo u·11a lmosl fall asleep COlly'" 'g the FCC s tu!! by compa nson. Use rs 'eport lhal theycan't ceneve ho w eas y 20 per ,eally IS w,' h Ihlslan!asllCone "Ou' lape

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e li ll RARY SH ElF l!I DJES - t nese slu'dy ,,"lIe , COrrUQal ed. d" '·,eS.51an t llo ' " N C," t'IOlO a lull year 011),1( ,/oO. ul1 W,c roco mpu ' '''ll or«J .., .(;nx;o mpu, U>9 W,lnyour 0I"lM<. ,eq ues l sell'Sl'C ~I"O 1,,!JeIS 10< i ny o I l.....' OIlQ-Ao lng . 13. 1(,10 0 . ,,11 /ot'' 'OCo mp u lln!l. 80 I.l'Cfoco m·P"" "9. CO. 0 51. ~"m R"a,o. ~rson.1 Comp<JI"' !1.R"d'O E'.., ,,o,,"(;$ , ''''ed"ce A~. " nO Byte Q.de. 1eXl llOO-lor 52 00 ' . or oer 2·7_8)(2002 _10< 51 50eec n". o,de r 8 or more-BX 1002 - lor 51 25 eic'"

·Use tne crcer card in lhlS magaz,ne or uerr nze you' order on a sepalat e p .ece o l pi pe' a nd ma il to : 73 RaOlo Bookshop • Pele 'boro ugh NH 0~58, Be su,e 10 Include check orcer auec credi l ca ,d inlo rmal iOn . NO C.O.D, O,ders accepted. $1.50 lor the '''II! Dook. S1.00 eac h add'ho nal Doo.k lo r U,S , de llvefy ind 10.e.g.n s utlace . For 'ore lgn a llma .l S10.00per ecce. Please a llow 4-6 weeks fa. delillery. Oues!ions ,egard.ng your O'do r? PleiSe wrlle 10 CuSlome. service al1he atmve addreSS, (Pr Ices s ubjec t 10 chango on l>ooks " 0 'pu blIshed by 73 Maga Zlne .1

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THE CONTEST CooKBooK-TIl,S book reveall teesec,elS 01 Iha ' el,le g'oup 01operalor. wl'lo lop Itle Ilslwhen the ecereet 'esulls are pubhshed II con tainsdel a .1ed luggestlons lor I..... I"S!-llme conle51... as _IIas l'PS lor I"" adyanced operalor. Dome.IOC. Dlt. a rx1.peclally contesls a ,e a ll dISCUssed. complele wllhphotog,aphs a nd d iagrams sl'lo",.ng It>e equ.pment andoperallng aids u5ed by tile t~ SCorltrl For the se"ousconleslltr. BIU30ll 55,95,

PROPAaATION WIZARD'S HAN0 8 00K _ b ~ J HNelson. When l unSPOlS "ddled the world ..""" communlca tlOnl ""Iworkl olltle 1~0s. JoI\n H" nry Ne lsonlool<ed to It>e pl.nel. lor a n a nswe r. The 'esu lt ..... alheory 01 propaoalion lorecaslfng ba""" upon .nle<·planetary al,gnmenl thai made lhe .u1l'l0r Ihe m051 re·hable tcreceerer in America loday The tJook p' O.,des a nenlightened lOOk at communicaiion. pasl . presenl, andfUlu,e , as we ll as teach,ng lI>e ." o f pro p.gal ,onIorec• • t,ng . BK7302 $6.95,'

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EVERYTHING YOU ALWAYS WANTED TO KN OWABOUT AMATEUR TElEVISION. (bul w_ alr.lel lo u k)- By M,ke Stone w8fIoco. Thi. book 15 a completeguide 10 se!ling up you, own amateur radio tele.i" on. ta lion, 11 con ta in. _ A hislory, whal eq uipmenl youneed. yideo theory. came ras , reco-cees. hg hling , sp&eia leuect•. sound ATV OX lng. mob,le FSTV. ATV,epeale's.ATV groups. bui ldinGprojec ts , test equip me nt. dea le, di·,ecto'y . a c umulali. e Inde x at O.er l lXXl a rt,Cle, on .lima·leu' TV and m uch mo re . This il lhe ....w. 1982 edltlotl.from lhe publls l>e ,S 01 Amaleu, releVlslor> Magal,"e.$995 BK1 2~~

WO RLD PRESS SE RVICE FREQUENC IES - b yThOm.s H.,,,ng ton Can' l Wil l 10 hea, lhe ""ening""WI. or a'e you ...onde<ing a bou l lh" newl thaI yOilI'e,, ', hearing" Rete;ye by Rad IO Te.ely~ ,RTTYI"1It>e ",o r'd new••nd Ilna nc ia l h.ppenmg. Irom l!.e..OIl(! cap, 'oII01l a2~ t>ou. a day baSIl . Th' I bOOl< g' ..es\'Ou " 'e l,eqU8f\C,e• • nd lImes 01 bfoadC.51 01 luch""wI se<vice l 81 AP. UP!. Reul ltrl . TASS. VOA .nodlondon Press . "' Iso included 15 .n InlrodUClfon 10RTTY "' ,Ih intormal>Otl on equ,pmenl. anlennes ,.bbfe",at oon l _,-.e<ythmg \'Ou fleed 10 gel starled in RTTYBKl 202 $7 95'

NEW

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INTERFERENCEHANDBOOK

THE CHALLENGE OF 160- The OtOWlh 01amaleur 'adooloday;s encou'8IJ'ng me useol 160 mete.-s. All I"'" Inlor·matio n necessary 10 get s tarted on lllls un 'Que banod. Itleall_ portanl anlenna and ground systems a.re descfibed,n deta,l. AlSO. how to get on. top-band operallng lIPS.lap-band "an"",llers, PfClPi'llO'lIon. _ a.II'Ief ,ee;e,,,,ngeqUIpment arx1 more a 'e cowered Hlluft. The inlrodUC·lion conla ll'ls ,nteresllng pIlotos 01 Sl...... Peny '. II....."""11 01 1601 :shaC:l<. Th'S 'eterence is uselul 10 new ande.peroenced lap-band opera lo<s BK7J09 SA95

INTERf ERENCE HANOeOOK- by Witham R. Ne lson,.....A6EOG- Thll I.me ly h. nd tJook CO,,",'S e ..ery type 01Rf l problem a nd g, . e. you 'he soIu llon. based onp' acI,ca.1 e . pener>c. , Coyer l In'e, ference 10 TV. •ad'o .h'-h . le le phone. ,.dlo am.l,.,. , . comme,c,al . nd CBeQuipmen' Po", e, line .n le" e rence II covered .n de p' h-1>0" to loc a le ' I. cu,e It, ..o ,k w.l h Ihe pUbliC. lalel ~

p.ecaullOnl, I>Ow 10 1... 1'1 RFII ;nye . lIg a to ... Wrin e n bya n RFI e . pe,1"',lh 33years o! e . pe" ence , this p'o!use·Iy illus U' led book ., paCked w.l h p,ac tic al easy·lo·u nd e,sla nd II'It o.mallo n BK1230 S8.%.'

RF AND DIGITAl TEST EQUIPMENT YOU CAN8UILD - BK10"'_ RI Dursl . luncl oon. square ",• ..e gen."'"Of'. ...n.tIle lenglh pulse ge.... . lors- IOO 10Hzma'ker. i-I .nod , I I ......p ge"",.IQI's.•udoo OSC. • 11r1 sig·nal inlOKlor. l~ 101Hz synlt>Hllet. dig'lal ,eadouts forcoun lers, seye,.1 co u nl.... p .ese.le '. m;crowa.."meIer. etc 252 P.ges 6 1(1~ ~ 95'

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VOL. AUDIO FREOUENCY TESTERS-J arfli)IGked""ltl a~ klnod. 01 audoo Irequency lesl equipment. Ityo ..f ,e inlOSSB. RTTY , SSTV. etc .. Ih,s book;S amusl foryou . , ,a lIOOd book !(If tIl·1I addOCIS and ....per."""',...s,too' LB7:li6o $1 95 •

VOL III RADlO FREQUENCY TESTERS - Radio f,equenc y waves. It>e common "'enorrun"too- 01 amaleu•. radi O,SUch ,Iems as SWR. "nl"nna ,mpedance . line ,mped·aoce. RF oulpul . and Held sirenglh; dela,led IIIs truchonson lesllng II>_ .Ieml Includes secuces on s 'gna l ge...e'ators . Cl)istal cal'br"torl, gnd dIp oscliialors, noise

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THE 73 TECHNICAL LIBRARY

TOOLS & TECHNIQUES FOR ElECTRON ICS - b~ A AWoch II '1'1 el5~' l o- under Sl'nd book wro Ue n !Of lI>ebeglnn,ng ' ,I·bu ,loer as wei' as Ilia e xperoenced 1>ObbY'Sl Ilhll nUmefOUS pretu,es ..nod de'sc"ptoonl 01 t""sale Ind (:QI'recl .. ..~ 10use bUlc Ind Sj)ftC'.hled 10015101 elecl'onoc ptOff!Cls. as ",e ll as speclalolfKl me lal·workIng 1000s . nod llIe cl'lemoc..1"'dS ..hOCh .re used Inr~" shops BK730t8 SA95 '

BEHIND THE DIAL-T....s book e.pI..,nl . ,n del.. ,1...hal ·S goong on on a il ltle hequenc_ I.om short" aYeup 10 moc'ow a..e II gl_ lhe reader a good ode. 01whalhe can fond .:aod ..here 10 lind It If"OCludlng some ot lhesecr'" sl ..toons such .IS lhe C.I.... ;Inod lhe F.B.I.E~tnlng IS covered short 01 moc.owa. , mQf'll lor"'ll.......,one ,m""esled In PU'CI'laSlng • shOI\"'a..e ' ecerYefshould ha.e a copy 01 IhlS book SUfYeOliance. st..honLayOUl consodetahon. a nloona syslems . ,nlerllCe. anodIhe elec Homagne tlC spectrum a re ,ncludedBK7J07 SA 95

THE NEW WEATHER SATELLITE HANDBOOK_ by DrR..tph E Tagga'l WesDOT He re IS the complelely UPdaled and ,,~y,sed ed'lIon con ' ..,nlng . 11 Ihe 'n fo.m.·lion on ItIe mOSI soph'SIICated . nd e U.,.;I,..e s p.ce-c,.. tt nO'" ,n orb, t ThIS eeee se'Yes bolh Ihe e .pe,,·..nceu ..maleu, s alelille en thu" aSI a nd t he ne",come' .II " In IntroduC I.on 10 s a lell,l e wal ch ,ng , p'o.'dln g .1IIhe .n torma tlon 'eq urred 10 conSltuCI • complele .ndh Ig h ly e llec ti . e g,ound Slal .o n SOlid hardwa' ede Slgnl a nd antne InSl'uC lions necesSl' ~ to oper a telhe equ ipmenl a ,e Incl uded Fo' e .pe"menler, who OWNER REPAIR OF RAOIO EQUIPMENT- by Fran ka 'e ope'al lng atatrcns. tl>e tJookdeta .II a ll p,ocedu,e l Glass K6RO. ae-e'e a tJook Ihat wi ll teach you an ap·necesu'~ 10 mod,fy equ. pmenl to' the ne w ee rree c t p,oach 10 Iro uble. hOOl lng "" ll'1oul a s l>ac k lull of lestI pacec,a ll Amateur weathe' sa telil le ac l' ••t~ repre ' eQuipmenl. W,men in • n.rt ali.e. non·malhemal,cai.enll a unIq ue ble nd 01 inl eresl. e ncompasSI ng el ec · sly le, it will encou'age yOU 10 s uccelllulI ~ lix you, own IC QP·AMP COOK BOOK _b~ Wa ller G. Jung. Coye rstro n,c •. me leorology and asl,o naul' CS. JOIn the p".i. 'I g p,oblems 80 to 90 '/0 otree lIme . £Yen II you don 'l no t o nly lhe basic lheory 01 Ina IC op am p ,1'1 g ,ea lleged fe.. In ..a lc hing lhe spec lac le o t ea , th a . l een ..ani 10 fiX, you ca n lea,n • 101 aboul I'Iow thIngs work de la,l. but also InCl ud e . o . e , 250 prac llc.1 cltcui l a p.h o m ,p.ce on ~ o u r o wn monllotlng eau, pm enl . a nd ta ll Add to your IIbfa'Y and personal e.pe" "~,, pllCahOn l hberall ~ .llu s tra led ~2 pagel ~'I•• 8 '1, .BK7383S8 95 , BK7310 57 95 , soflbound eKl02851~95'

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HAND BOOKS FORTHE HAMSHACK

THE COMPLETE SHORTWAVE USTENER'S HANDl OOK, 2nd EOITtON I)y Han~ Be<1 nf111 a nd HI..., I..Helml. Th is comp,ehenSl v. vo lume conlaina lo ads 0 1nil.. IntOl'm~II'on "om a ll 0"'" th" wOI' ld on \h" ls I".,de",'opme"t s ,n SWL Ie<; hnology clubs, assocl.t ,o"s ,pfael'c". and "allon• . A thorough g UIde 10 ,'allons 01",,' ..Of III by gene'll COI'1 tme nl.' area Irn:ll'equll"cy i.in cluded 81<1241 $~95

THE TEN METER FM HANDBOOK - by Bob He,1 K9EIDThl'l'lan"boo~ h•• been publ,Shed to h"lp the le n mele.enthuSiast learn mOt, about ttle many method. 01 conversions 8mllrickl 1tlal ar" used to ma ke " ..sling un!tawo,. oeuer. JOIn 11'"Il,eat "Iinke'ers" of thll world on tenFM ana enjoy Ihe fantastic amount 01 lun in communi .ea ting .. ilt> amelllu, s tations wor ldwIde On t ll n mel.,FM aKl190«95 '

THE PRACTICAL HANDeooK OF AMATEUR RADIQ FMREPEATERS - by B,II Paslemak WA61TF (Iulllor 01 73Magazines mon thly col umn " LOOkmg Wesn th IS ilthebook lor I". VHF I\JHF FMer. com pIled h om mlteril'l ut/ml ll ed by Oye' • hund'ed Ind ' '''du . I., c lub l.OIgln'llhorl. l nod equ,pmeol tn.lInu tacl ur.... A "muI I1Ia..e·' tor your him I/'llCk s hoe!l. BK1185 Sl2 95 '

RADIO BOOKSHOPANTEN NA BOOKS

II HOW TO DEFEN D VOURSELF AGAIN ST RAOAR- BK1201- by Bruce F. Bogner ana James R BoClnar. a la wyeranCl rad ar expert_ Thrs book g ives you the ammu nit Ion to challenge the raCla r "'evIClence" tha t usual ly lead s 10 aspeedIng convlct ,on_ The major part. ot the book details the on ner work ing s o f raoar-you' li become more of an ex.pert than mOSI po l ice olt lcers and ludges. The rema on der o f the book outlines how to defend you rsell agamsl aSPeedonll locket -:- the observahons, meaSures an d testImony you must obtam to defend you rsel1 w it ho u t the he lp ofa la wyer. The pnce is a lot less Ihan a fone' $6.95 '

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ITL COOKBOOK-by Don Lancaster, h p lai n s whatTTL is. ho"" i t work s, and ho"" to u se it. Disc usses prac·tics ! applrcatlons, such as a d igItal coun ter and d," p la y system, events counte r. el ect ronic slOpwa tch .d ,g ,t a l vo l t met er a n d a d ig ,ta l taChOme te rBK tOO3S9 ~O'

CMOS COOKBOOK - by Don Lancaster _ Deta i ls theapplrca tron 01 CMOS. t he lo w po wer lo g ic l ami lysurtab le tor mOSI applicatIons p resen t ly do minated byTTL. Req u" ed read",g for every serious d ig ita l ex pe " mente r' BK 1011 St O.5O. '

TVT COOKBOOK _ b y Don Lancas te r Descrobes IheUSe of a slandard telev,"io n rece ive, as a m icrop,oCesSor CRT termona l Explains and describes c harac ter generation. cursor cont rol and inle rl ace ,nl o rmat,on In lYPlcal , easy- to-unders l and Lancaster slvieBKt OO4 $9 .95 .'

BOOKS

73 DIPOL E AND LONG-WIRE ANTENNAS- bl EdwardM No ll W3FQJ This is the l irs l co l lec t;on 0 virtua l lyevery typ e of w ore.antenna used by amateu's_ Inclu desdi me nSIo n s. cont lguratmns, and oetauec const ructIonda ta l or 73 di lterent antenna lypes Ap pend icesClescr ibe Ihe conSlruc tton 01 noise br idges, li ne t uners ,and data On mea su ring resonant Irequency, veloc ll ytacl or, anCl swr. BK1 016 $~.5O. '

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II ALL AB OUT CU BIC AL QU AD AN TENNAS (2nd edi tl onj-BKl 196_Thll "Clnsic" on Qu ad da silln .lhllOry, conSlfuc llon , a"d o peretio " . New- 2nd edI tIoncont .ins nllw f. " d "nd m"tching systems .nCl newd.l ,,_ $5.95,'

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li THE RADIO AMATEUR ANTENNA HANDBOOK BKt 199-AIi aboul wore anlennas. beams tu ners ,baluns. coax , rad,a lS, SWR and to wers Clea r and comptete ,nl ormat ,o n. $6.95'

VHf ANTENNA HAND BOOK _ The new VHF Anre" naHamjboo~ cetaus the theo,y, design, and con struct ionof hundreds of dil1erent VHF and UHF antennas , ap,ac lica l boo~ wrinen fo, the av"rage amateu r whota kes lOy 'n bUlld ,ng , not l ull ot comp le. for mulas to r tMdesign engmee' . Packed wl fh fabu lous antenna projec tsyou Can build 8 1(7368 55 95, '

• BEAM ANTENNA HANDBOOK (New 5th edition) 6 K1197- Yag, beam theo ry , conStrUC!lon and operat ionIntormal ion on ...ore t>eams. $WR curves and ma tchingsystems. A "must" for S" rlOUS aXe,s 5595'

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WORLD REPEATER ATLAS- Com pletelV Upd ated. over230 pages 01 repea ler li st ing s are InClexed by local ionand trequMcy. Mo re than 50 maps pinpOint 200Cl re peater loc at,o ns th,ougtlou l the USA Foreign li stings InClu<le Europe. tne M,<jd le East. South Amenca. andIl, f"ca $4 95 ' BK73t~

THE MAGIC OF HAM RADIO - by Jerro ld SwankW8HXA. Under various cal ls igns, W 8HXA has beenheard on the ham bands since 1919, He has watchooamateur radio grow from lhe d aysof Mode l A spark coils10 an era ot microprocessors and sa tellite commu nica·tions . Jerry has respo nded to calis for he lp from eart t>quake·striekn Managua anCl lornado·ravaged Xen la_ Ant ·arcti ca, one o f man's lone l iest outposts, has been a billess ionely. thanks to Jerry's ti reless phonepalching efforts , Drawing o n his o wn colorfu l exper iences andthose of many olher hams, Jerry has complied this WOrd·pic tu re of ham radio du'ing Ihe pas t s ix ClecaCles.BK7312 $4,95

A GUIDE TO HAM RADIO _ by Larry Kahane' WB2NELWh al 'S Amateur Rad iO all abou t? You can iearn thebastes 01 thIS fa sc inahng hobby with Ih is exceilentbeglnn~r'sgUI(le . It anSwers lhe most frequenlly askedquest,ons <fl an easy-going manner. anCl it shows lhebesl way 10 go aboul gell Ing an FCC ncense. A Gu lOe toHam Rad iO IS an Id ea l introduc tIon to a hObby enjoyeClby people aroun d the ""or IO. S4 .95.' BK7J21

TEXTEDIT _ A Complete Word Processing Sys lem Inklll o,m- b y Irwin Rappapo, !. TEX7EDIT is an inexpenSIve word pro cessor th at you can aClapt 10 sui l yourneeCls. l rom writing form lett ers 10 la rge te xts. It is wr it ·ten in modules, so you Can load and uSe o nly Iho se POft lo ns 1hat yo u need _IncluCleCl a re modules l hat performrig ht JUSt i fica tio n, ASCII upperl iowercase convers ion,one-key phrase enler"'g, complet.e ed itorial fu nclions.anCl much more ' TE XTEDI7 IS wrItten In TRS ·BO' DIskBASIC, and the modu les a re doc umented in t heaul hor' s admi rab ly clea r 1ulor ial wf il ing style _Not on lydoe s Irwi n Rappapo rt explain how to use TE XTEDiT; healso exp la ins p ro gramm ing tech niques implemen teClin the system. TEX7EDIT is an inexpensive wO' d 1"0'cessor that he lps you learn aboul BASIC programming, It is written to r TRS·BO Mode ls I and III w ith TRS·OOS 2,212.3 anCl 32K. ' TRS-BO anCl TRSDQS are trademarks ollhe Radio Shack Divis ion o f Tandy Co,porat ion _BK7387 S9,97

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ANNOTATED BA SIC-A NEW TECH NIQUE FOR NEOPHYTES. VOL 1 & 2 _ Ann ota terj BAS!C expla ins thecomple xit ies of modern B ASIC. II inc lude s COmpleteTRS -SO ' Levet II BASIC programs that you can use. Eachprogram is annolaled to expla in in step·by·s tep tash ionthe ""orkings of the p'ogram, Prog rams are t10wchartedto assisted you In fol lowing the operational sequenceAnd-each chapter includes a descuplion ot the newconcepts wh ich have been in trodu coo _Volume 1 BK73B4 $1095 Volume 2 BK7385 $10.95

HOBBY COMP UTERS ARlO H ERE!1f you wanllo comeup to speed on how computers work -hardware an dsoftware-this is an exce l lent book, 11 sta rlS w ith tunClamenta ls and expla ins the circu its and tile basics 01programming, along with a couple 01 TVT constructionprotects. ASCII. Baudol, etc . ThIS book has the hIg hestreco mmendatIo ns as a leaching a ld_ S2, 47. BK7322

KILOB AUD KlASSROOM- By Georlle Vo un g and PeterSta rk . learning eleclronrcs lheory Without practice Isn'teasy . And ifs no fun to build an electron ics project thatyou can 't use, Kilobaud K!assroom the popula, series1Irsl pub lished In K ilobaud Microcompul ing, combinestheory w ith practice . Thi s is a practical Course in d ig italelec tro nics. It starts out w ith very simpie elecl ronicsprojects, and by lhe end ot the course you'l l constructyour own working microcomputer' BK73&l $t4.95

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130 73 Magazine . November ,1982

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REVIEWS- Before you buy, save yourself somemoney chec k 73's in-depth evaluation of thelatest gear.

DX - This globe-trott ing column keeps you Ill

formed about the news of t he DX world from Kingman Reef to Bahrain

CONTESTS - You get all the news on the contestworld from Robert Baker WB2GFE. He'll give youinformation on upcoming events and results fromrecent contes ts.

FUN - Just for fun, John Edw ards KI2U providesyou with wacky puzzles. qui zzes, and games thattest your ham mett le.

NEVER SAY DIE - If you wa nt controversy,Wayne Green W2NSD/1 will gi ve it to you . H ispopular colum n ranges from trave logue to t iradeand 15 guaranteed to enterta in , inspire anden lighten you.

RTTY LOOP -To keep you abreast of radtote !etype developments, M arc Leavey WA3AJR explains the new RTTY equipment, the increasingrole of computers in RTTY, and ot her matters ofinterest to digital com municat ions fans.

CONSTRUCTION - The builder's magaz inethat's 73. You get the best projects f rom the bestauthors every month ,

NEW PRODUCTS -This brief look at the latestham equ ipment on th e market keeps you on top ofnew developments in am ateur radio

HAM HELP- As a serv ice to you, 73 prints you rquestions in our magazine, Th is helps you to obtain hard-to-get parts, schematics, and owner'smanual s,

AWARDS - To find out what cert ificates are avai lable where, read Bill Cosnev KE 7C's coverage ofall the ham rad io awards,

SATElLITES - From Phase III to TVRO, 73 Magazine covers the news of the sate lli te world l ike noother radio amateur magazine,

FCC - If you 're look ing to the future, these outtakes from the Federa l Register chronicle changesin policy and regu lations that relate to amateurradio.

etter

2.3.

s.

1.

4.

7.

6.

8.

9.10.11.12.

NEW PRODUCTS FROM HAL-TRONIX

HAL-TRONIXP. O BOX 1101

SOUTHG ATE. MICH . 48195PHONE (313) 285·1 782

HAL ICD·16:

TOUCHTONl DlCODlR KIT5

HAL 561.11: !>ingle- l ine in . I I l ine!> out. complete w irh

l ·sided platect-chrough G-l0 bo.... rd ....nd .... 11componem s. Uses seven 56]"!> <lnd three7 4 0 1 .!> $39.9"

HAL 561-16: stngte line in . 16 line!> out. complete wi t h

2·sided pta ted. rnrougn G- 10 bo ....rd ....nd a11componems. includes 2I-pin edge coonecr or.

U!>e!> e- ighl 56 7" !> end l our 7402 's . (See con-snccnon anicle in April 198 1 R d iO &. Hec -

nonlcs for complete wrueup.] . ... , $69,9"

TOUCHTONl lNCODlR KITS

HAL lCD-l1 : 3 III 4 rwetve-cf.... tee ter encoder util izing t heICM 7106 Inler!>i l chip. Kit comes complete

with both ltD ....ncl ....uctio-coupled outputs[spe ker included). W ith a Iuminum anodi zedc se $1 9 .95

4 III 4 !>i xteen ·chM CU!"r encoder utilizingthe ICM 7206 tmer su chip. Kit comes complete w it h LED ....n{l ....ccuo -coupieo ourpoes

(spe ke-r incl uded). W ilh Iuminum anodizedc s.e U9.9 5

'-"== ...-

1304 MH.I DOWNCONvuuas

frequency Range 2000-2500 MHz2304 Model I : s.. tc rhree-seege. re c seilnd cc r mec tore __ . ._." $49.951 304 M ode l I : Thre-e -!>t ge. mcludes pre mp . w ith dre-c.... !>t

( <lse nd connecr ors.: , , $"9.9"1 304 Model 3: With high·g in p re mp . cne.cesr c se ndcOnneCl o r!> '. _.$69.9"

The ....bcve model!> complete w ith h igh-qUil hty drilled PC bo.... ros..... 11 e lectronic compooems. erc.. w ith 15·p...ge menUilI.

Note: Any o f the above, factory w ired , $SO ....dditionalroWER SUprLlES f O R THE OOWNCONVER TERS,

Po wer !>upply ki t /I I . tess cese nd connectors S19.9"

Power !>upply ki t It I , Incluoev case &. connecro-s S24.9"rower supply-alr e dy buill. comp le re $34.9"

PARTS FOR THE NTSC Rf MODULATOR f O RCHANNELS 3. 4 . or S.Thi!> is not .... comple te k tt . The haed-to-get p....ns inC lude

th e LM ·1889. the .08 microhen ry tank COil, t he 7·1 4 mtc ro.

henry ....d ju!>t ....ore coil, the 10 m!crohenry Rf coil. w ith sene.matic (no PC boa rd ) s used in Bob Coopers serenne TVrece iver . Real buy r _ $" .9"

SHI"'INO ''' ' CHI. " n o..~DERS OVEFI 120 00 WILL 8£ SHIPPED POS TPAID EXCEPT ON 1T£ t,lSWHERE " OOIflQf\lAl C....A~£S ARE REOUESTE O C "t ORQ£RS LESS 1M"'''' . "l2000Pl£ASE wcuee AOOlTIONAL 1150 FOR HA"'Dlll\lG "''''0 ""A,ILl f\tG • (.1lI ./

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...tt~-~ prices arc going up.'i.~c~ . ct v.~. Stop waiting for the rightl-~. O\.~'t::> time to buy! Stoek up now on all• roe ","{c, ~ the prowams you want, and SAVE.

-()....'\.'-' A .....s" Shop early and save $$$$$$ on your,.. l>- ~~~\.I- Christmas shopping also.

~e ''''~ Hem~mher , this is the last chance to buy Instant~"-~ ,,2-"{c, Software's products at the old 1982 Prices. Effective

~.).. c.....o\~ November 15. 1982$ Instant Software will be raising its pricest>~ X.~ on most of its products.

,""",-,!6'-~ O rder today so that you too can heat the Instant Software priceV \.~'5 increase. Just eall toll free:

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132 73Magazine . No vem ber, 1982

MODEL370-10

The New Standardin High PerfonnanceRepeater Control...

o Room to qrcw: BUILT IN! Features intelligent rerrote control 300 meter readlack Interfaces to synthesized remotebases and links. Planned soft-ware up;;jrade path.

o SUPPORT - We Invent ed the"coroner Controlled TalkingRepeater." so we know how toprovide the applications assistance. and long term scooo-t socrucial to a ccrocrer basedproduct

o BRING YOUR REPEATERSYSTEM INTO THE BO'S - Starting at less than $12001

O1ange command codes. mes-sages. tone characteristics, tim- TIl RC-8.S0Ing. and more. remotely! eReliable storage in E'PROM. Repeater Controller!

o FRIENDLY, POWERFUL EASYTO USE - Hum an engineeredto be your "assistant" at therepeater. with capabilitysecond to none.

DREMOTELY CONFIGURABtE -

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The Spider AntennaThe modern mu lti -band mobile antenna- sw it ch to 10 , 15, 20 or 40 m et erswit hout stopping to change resona t ors.Featu res o( the Spider ' " Antenna• Th~ Spider"· An t enna is less tha n six feet highand t he longest resonator projects Ollt from t hemast 24 inches. T his give . " slim pm_file, low height and light weight, offering little wind resistance and \e liminating the need for aspring mount. .,-• E ach resonator is tuned t o ""'I,...~the desired portion of the band bya t u nin lt sleeve whi ch slides OVer t heoutside of the resonator.• SW R is approximateriy 1 :1 at t heselected resonant frequency.• Base impedance approximately 50ohms, requiring no matchmg network.• Idea l for use on vans, campers,motor homes, travel t rai lers: a lsoin mobile home parks, a par t me nt houses and condoruiniums.• Spider'" Antennas are not m adeon a production line : they are v ir t ua llycustom built .The Spider' " Marltlmer' " is t~le ultimateantenna for marine use . Constructed o f nOnmagnetic stainless steel and mckel-cbrome platedbronze, and using the regular Spider'" resonatorsand tuning sleev.es.The Splder T .. Adapter converts any mOnOband antenna with a half inch mast into II modernfour -band antenna at a modest pr ice: .For further in form ation. pri c e s w ri te o r cal1

.... s~ Lis t 0 1 AdveNisefS on page 130 73 Magazine · November, 1982 133

NEW PRODUCTS, the mode switch. Audio peak fil

tering for CW, audio Shaping forall modes, and an i-f notch filterp rovide outstanding intelligence re c overy . The noiseblanker i s highly effectiveagainst the "woodpecker" andpulse noises.

Equipped for SSB and CW operation, the FT·1 02 option list includes an AMIFM module for activating those modes. Other accessories for the FT-102 are theFV·102DM synthesized vto, theSP·102 speaker with audio utter,the SP-102P speaker/patch, andthe FC·102 1.2·kW antenna tunerwith optional remote antennaselector.

For further information, contact Yaesu Electronics Corp.,PO Box 49, Paramount CA90723. Reader Service number476.

DENTRON'S NEW 5·BANDTRANSCEIVER

DenTron Radio Company hasbegun production on a new200-Watt, CW, SSB solid-statet ransceiver named the HorizonOne, which covers BO-15 metersand any 5OO-kHz segment of 10meters. Its sensitivity is .35 uVfor 10-dB signal-to-noise ratio,with selectivity of 2.4 kHz at6-dB points and G-60·dB factorof 1.7: 1. Performing with the lat.est MOSFET and ballasted emitter semiconductors, the Hor izonOne also has a pinpoint digitalfrequency readout using LSItechnology.

Input power is 200 W PEP withan output of 100 W PEP nominaland 80 W PEP on 10 meters.Powe r requ irements a re12.6-14.5 V de regulated at 2.0Amps maximum and 12.6-1 4.0 Vde regulated or unregulated at18 Amps peak. The Horizon Onehas a built-in VOX, noise blanker, and hand mike as standard

are done via a zz-orn, o.tss-rncnedge co nnector.

The M B-1 Mult i-Board building bloc k is a "universal " circuitthat can provide up to ten different functions. Config ured by theuser, the MB-1 can be a variableaudio-frequency signal generator, variable radio-frequency signal generator, audible CMOSlogic probe, LED output logicprobe, repeater beeper, gatedmonostabre. gated astable,pulse stretcher, adjustable timer, individual positive and neqauve edge triggers, and more.

The MB·1 is completely selfcontained and operates on anydc voltage between 5 and 15vol ts . Output level, pulse teng th,and frequency are tuuy adjustable wi th en- board controls. TheMB·1 comes complete with anassembly and app li ca ti on smanual, and all parts, sockets,PC board , and accessories arefurnished.

For further information aboutthese products, contact W·S Engineering, PO Box 58, Pine HillNJ 08021. Reader Service number 481.

Yaesu Electronics Corporat ion has announced the evanability of its new FT-102 line ofHF equipment.

The FT·102 transceiver util izes an au-new transmitter section featuring three 6146B fina ltubes for extremely low distortion.ln addition to VOX and an rfclippmq-type speech processor,the FT-102 t ransmit audio maybe adjusted fo r optimum response to the operator's voice.

The FT-102 receiver u seshusky JFET components in thef ront end for w ide dynamicrange. A number of fil ter optionsare available, with wide/narrowfilter selection independent of

YAESU FT·102

cluded as options for UHF units.Frequencies are available fromas low as 15 MHz to as high asthe BOO·MHz land-mobile bands.

For further information, contact Lunar Electronics, 2775Kurtz Street, Suite 11, San DiegoCA 92110. Reader Service number 484.

NEW FROMW-S ENGINEERING

W·S Engineering, manufacturers of the Porta-Peater, haveannounced the introduction ofnew related products that will beof interest to both Porta-Peaterowners and othe r amateu rsalike.

In addition to the Pcrt a-PeaterM-1oo, which will interface withany two transceivers or receiverand transmiller pairs to create afull.Iunctlon repeater, W·S Engineering now offers its new Perta-Link Pl·250 and MB-1 MultiBoard building block.

The Porta-link Pl·250 is a single-board simplex link and portable repeater that may be interfaced with two transceivers, ortwo rece iver-transmitter pairs,to form a complete repeater svstem for applications th at do notrequire a CW·ID system. Ownersof the Porta-Peat er can add thePorta-link board and have acomplete duplex link, remotebase, and dual repeater. ThePL·250 has en-board controls fortimeout duration, hang t ime, audio balance, local mike gain,and local speaker amplifiergain. Connections to the PL·250

GaAsFET VHF/UHFAMPLIFIERS

lunar has announced a line alnarrowband tuned receivingpreamplifiers for the VHF andUHF communities . Typicalspecifications exceed those ofpreviously-available receivingpreamplifiers by up to ten timesin performance. EXhibiting veryhigh gain at VHF (typically22-24 dB), moderate gain atUHF (typ. 16 dB), and a very lownoise figure (typ. 0.3-0.4 dB onVHF and 0.5-0.6 dB on UHFland-mobile t requenciea), theseunits are also well-suited tohigh·r! environments, exhibitingl·dB compression power levelsof + 10 dBm or more.

The good gain, coupled withthe very low noise figure, effectively reduces a typical repeat erreceiver sensitivity to that of ambient limit at ions. 6- 1(}.·dB improvements in receiver pertermance have been consistentlyreported by users in a typical reopeater installation between theduplexer and receiver input.

Units are built to the customer's specified frequency, but doexhibit a typical bandwidth of5% CF with lillie degradation inperformance. De input is weu-tute reo and regulated, which atlows accepting any dc voltagebetween 12 and 28 V (drain approx. 35 mAl. VHF connector options include BNC, SMA, N inand out; UHF connector optionsare SMA, N in and out , with SMAin BNC out the stand ard option.SMA to RG·58 connectors are in-

Lunar 's GaAsFET VHF/UHF amplifier.


Yaesu's FT·102.

RINGORANGERII

MOBILERANGERSMORERANGE3 dB GAIN5/8 A.STAINLESS WHIPGRIP TIGHT roLBMAGNETCHROME PI..AT£D BAS£NEAT APPEARANCETHUMB LOCK AOJUSTMENTNO WHIP CUTIING

~ LOW PRICEMAGNETIC MOUNTSAMS-147 14&148 MHzAMS-22{l 220-225 MHzTRUNK LIP MOUNTSATS·147 146-148 MHzATS-22O 220-225 MHz

7dBGAINHIGHESTGAIN2 METEROMNIOUTPERFORMSCQNEANOOOUBLE ZEPP'NORKMORESTATIONSELIMINATE NOISELIGHTNING PROTECTEDACCESS MORE REPEATERSASSEMBlE EASILYINSTAll QUICKLYAalMF'lETE ANTENNAALL PARTSINClU!:tD600.000 HAW'f USERSBECOME ONE TOOWARX-2B 134·164MHzARX-22l)8 22O·225MHzARX-4~B 435-4~MHz

BUY FROM YOUR OEALER

48 Perimete r Rood , P.O . Box 4680Manchester. NH 03 108Telex · 95305O .... 106

•THE ANTENNA COMPANY

II'"- ..a- .~~• •

(C" alf lind flqU,pmfffl l 1101 Included!

Weight 0 1 tlble i. 250 Ibs.

CQ PRO DUCTS8280 Janes Ave.Suite 137-1700

Woodridge. IL. 605 17

Take your favorite H.T. outfor adrive tonight. ~~:'::h~~fARO~~For $69.95 you get the most efficient, "'J~dependable, fully guaranteed 35W 2 meteramp kit for your handy talkie money can buy.Now you can save your batteries by operatingyour H,T. on low power and still get out like amobile rig. The model 335A prod uces 35 wattsout with an input of 3 watts. and 15 watts out with ~ ' ....only 1 watt in. Compatible with lC-2AT, TR-2400. ...,..Yaesu. Wilson & Tempo! Other 2 meter models are avair- ~~able with outputs of 2SW and 75W, in addition to a 100Namplifier kit for 430MHZ. ....382

Communication Concepts Inc. ~~~ ....._o.,""" OH . s.tal

Rl'quire:'> o n ly 60 ~ corner ..paceFormtca d esk top and ebefves.Sh t'! ( height a dju..ta bleSolid ma ple leg..$~95. 00 chec k o r .\1 .0 .Shipped freight collec tAlltlw 30- 4-5 d a ys d e ll verv

Semi {or det ailed bmd lllre

ALL YO UR GEAR AT YOURFINGERTIPS IN A CONVENIENT CONSOLE DESK

, '"

.... See Lis ! 0 1 Advemse,s 0" page 130 73 Magazine • November,1982 135

Dentrons Horizon One. Alpha Delta 's Master Contro l Console.

equipment. Optional accessories include an ac power supply,matching antenna tuner, linearamplifier, and mobile mount.

For fu rther info rmat ion, conta ct Tim Neill, Tech nica l SalesRepresentat ive, DenTron RadioCompany, Inc., 1605 CommerceDrive, Stow OH 44224; (2 16j.6884973. Reader Service number485.

DIVERSITY RECEPTIONFOR REPEATERS

Pegasus Elect ronics has announced a new d iversity receiving system for repeaters. Nowyou can turn any repea te r into a"super repealer" by adding aVS·2 voting system and an rllink. The VS·2 compares th e audio quality of any 2 receivers(they need not be match ed) andconnects the one th at hears youbest to the repeater lo r retrensmission . Since the YS·2 isalways listening to both receivers, it can continuously updateas you go from a peak on one toa null on the other. The result:You have a repeater wh ichsounds like it has no " dead"spots and you r users are alwaysreadable as long as they are solid into anyone of your receivers.

The YS-2 wa s designed towork with anything. It has all itsown level controls and ensuresa constant output to your repeater. It was designed to be installed by anyone who knowshow to read a scope. The VS·2 issupplied on a single c ircuitecerc (5'4 · x 5 'I• ., and containstwo squelch circuits (COS). It isIUlly compat ible with t z-vcrt log·tc. s-vcn log ic, and inverted logicby cutt ing th e desired jumpers(or you ca n use your own logic

and bypass tnat portion of theVS·2). The VS-2 is not a kit-itcomes fUlly assembled and tested and is wa rranteed lor one tunyear.

For further information, co nta ct Pegasus Electron ics, Inc.,8B New Dorp Plaza, Sla len Island NY 10306. Reader Servicenumber 488.

PHOTOVOlTAlC SYSTEMS

Encon Corporation. autho.rized distributors of sera-excnctovcnerc products. has apu blication entitled The Complete Pnotovottesc Sys tems cetalog which ca n answer many ofyour questions about sotar energy conversion and dist ribution.The catalog covers an int roduc tion to photovo lta ic svs.terns. onotovottarc cells andpanels, renewable energy batteries, charge controllers andmetering devices, ac power mverters. how to select a workable system for your needs, besic t z-vort systems, large-dclsrnan-ac systems. componentsand accessories you will need,solar demonstrators, educanonar rnat enats, marine and recreal ional panel s, and much more.

If yo u have an interes t in direct co nversion of sunlight topower, yo u wi ll enjoy thi s cetalog and overview 01 the entiresu bject. A price guide as well asan applications questionnairelo rm are included so that youcan obtain expert advice and assistance for potential eccncanons that you may have in mind.Encon will assist you with you rquestions and needs in solarapplications.

For fu rther information, contact Encon Corporation. 27584Schoolcraf t, Livonia MI 48150.Reader Servic e number 479.

MASTER CONTROL CONSOLE

Alpha Delta Communicationshas just announced its newMaster Ac Cont rol Consolewhi ch combines power-surgeprotection and cent ralized "onloff' cont rol of several components. The MACC unit plugs in toa single out let and provideseight plug·in " U" ground outlets:one " hot" cutlet for continuousty-powered appliances such as aclock, for example, and sevenoutlets for ind ividua lly-<::ont rol·lable components.

The trent panel has rockerswi tches for the individua1t~'.

cont rollable components, plus amaster cont rol "on/o ff" rockerwhich allows the entire systemto be turned on or off at once. Allrockers are lighted wh en "on."

The surce-protection fea tu reis perhaps lhe most importantfeatu re of A lpha Delta's MACCunit. The delicate circui try 01modern scud-st ate electronicequipment is particularly vurnerable to damage from powersurges and spikes which can becaused by natural o r man-macesources such as l i g ht n ingstrikes, electric motors, transfo rm ers , wind ·blow n sno w,cloud s, fluor escent lamps, power outages, and the like. TheMACC is test ed to IEEE pulsestandards and is rated at 15 A.t25 V ac, 60 Hz, t875 Watt s cont in uou s -du t y to t a l f o r meconsole.

Priced at $79.95 (US), theMACC is available from AlphaDelta dealers or, for $4 more tocover postage and handling . di·rect from the factory. Alpha Delta will quote on overseas pest age and on th e " European Mooet" MACC·E available wit h VOE·approved socket for 240 V ac.

For further information, contact Alpha Delta Communica·tions, PO BOil 571. CentervilleOH 45459. Reader Service number 486.

MORny SOFTWARE FORCOMMUNICATIONS

MDRTTY is a general·purposecommuni cati ons prog ramadaptable to almost any set ofconventions in current use. It inc ludes ASCII and Baudot capebumes at a wide range of baudrates. There are 18 parametersfor adaptation to particular conventions such as fu ll screen.split screen, tun or half duplex,and many more. There are 15disk operations, includ ing d iskfile send . receive, d irec t bi naryto hell: upload, hell: to binarydownload. automatic messagecapture with file sequencing,and au tomatic answering ofmessages from a disk file.

The equipment required tomake use of the program is anH89 or Z89 m icrocomputer with32K of memory and an H88-3 serial interface. MORTTY reprograms the serial interface forbaud rate, etc.. according to th ecommunications mode selected, and does the t ranslat ion between ASCII and Baudot wh en aBaudot mode is in use. In placeof the Ha9 or Z89 with H88-3, youmay use an H8 with H19 terrmnal and H8·4 serial inter facewith H17 disk system.

The software required isHDOS v. 2.0. which is the cu rrentHeath disk operating system.Heath claims that programsshould be upward-compatiblewith new HODS releases, but wecannot quareruee that this willal ways be true.

The price ottne MORny pro-

rCOM IC740 969.00IC 701 {New ) 800.00IC490A 569.00

IC730 , . . . . . . . .. 6 99.00IC25A 309.00IC3AT/ IC4AT 26900 ea.

YAES U FT230A 299. 00FT1 2 395 ,00

Fi1 0ZD/3 74900FT707 64900FT208R / Fi708 R .. 28900 ea.FAG7700 .. . . 44900

DRAKE TR5 69900TR 7A 1450,00A7A 1400.00

Cubic 10 3 1095,00Bird StockKenwood A60 0 299 .00

TR7730/ TIM 299.00Tote 'n Talk CordlessBase / Telephone 149.00N EW S ignal /One Mi lspec SoonPermitron Wi re less Burgla r Ala rm3 Aemotes 199.00W6TOG Kits Stock

Demo T S530S 600.00Alpha 78AF

(Hi Serial No .) 2795.00Kantronics Interface 169.00

M in ireader 249.00Santee HT 1200

+ Batt/cord 269.00Be lden 9 9258, AG8X 19C/ft ,

82 14, RG8 foam.. . . 36C /ft8 267, RG2 13 , 43C!f1.8448, Aotor 27C ' ft9405, HD Rotor , 45C/ft

AEA M BA AO , 26 9 00MM2 125 ,00CK2 , , .. '. . , .. 8900

Robot 800A 74 9 00400 . . . . . . . . . . . . . . . 67500

Buttern ut HF6V .. ..... 125,00Sax ton 4 50 OHM

Openwne Line , . . 20C ft

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• FREQUENCY rang. 1( 4·1 48 MHz• OPERATIO N fM or 5SB l,omplel.ly hno..) Class AB l• Rf DRIY( 1 10 30 watts• IlEY IIII G Rf ocl"a1.d ... Ih ~"g h qualtly "Iav'• SSB ooa" """ buill ,n 6, lay• POWER REQUIREME NTS i)'oical 10 walll d". a. 13 amp$ at 13 8 VDC• IDLE cunen! 20 mIll.• MOBILE Of FIXED "p..atlon• PREAMP 1808 gain min imum• NOISE fiGURE I... 1I1"n 1 5 08• PREA MP KEYI NG independe nt - sepamel, Rf aui."ted ..lay.• CO NSTRUCTIO Nwrap around aluminum heal " nk 2 pieco•

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1 2 3 4 5 6 1 IS 9 10 VJ90Pl """plilio, ' 13995 plut n oo shi!lpingPOWER INPUTIN WATTS VJ15 POWER Supply 199,95 plus n.llil shipping

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Matching Power SupplyIS A"P SUPPLY wI 13 lb•.•i,. 8"{wl. 5"lh) . 6"(dlI....EOIATE SHI PMENTALL PARTS AND lABOR WA RRANTE D ONE f ULL YEAR

MASTE RCA RD VIS AA ll P"'""S lob Houslon e,cepl w he' e IndIcated P"cess u bl~C' to change waho ul nOl lce, all item s gua ' ~nteedSome lIems suhject p' io, sale . Texas re Si dents add S%lax. Please odd suffiC ient poStage , balance col lect

lWillWU~lU(]Electronics Supply

1508 McKinney ~"

Houston, Texas 77010

,..See LiSI of Advr" r,sers on page 130 73 Magazine • November,1982 137

MFJ 's VHF converter,

Automatic polarity switchingallows one-button selection ofany channel without additionalpolarity adjustments, and abuilt-in modulator eliminatesthe need for a separate modulator. The model 6128 is capableof receiving normal or invertedvideo signals, An optional model 6192 remote control unit 01fers the added convenience ofremote channel selection andfine tuning.

NEW TS-830, TS-930, R-820FILTEA KIT

Fox Tango Corporation hasannounced the availability of aspecial high-quality matched-filter kit designed to significantlyimprove the selectivity of thepopular Kenwood R-820, TS-830,and new TS-930 series. Theserigs all use similar dual-conversion i-f systems with 8830-kHzfirst and 455-kHz second intermediate frequencies. l-f bandwidth filtering at both frequencies is used to provide VBT (variable bandwidth tuning). However, in the T5-8305 model , the2.7-kHz bandwidth of both original filters (resulting in a netbandwidth of 2.4 kHz with VBToff), the combined filter shape

For further information, contact Channel Master, Division ofAvnet, Inc., Ellenville NY 12428.Reader Service number 482.

A signal -strength metershows the relative strength ofreceived signals_ The ChannelScan button is depressed to cycle the receiver through thecomplete horizontal channelrange in about one second, asan aid to aiming the antenna.

Two Priority Audio buttonsselect audio channels (6.8 and6.2 MHz), while additional audiochannels may be selectedmanually.

Channel Master's model 6128 satellite receiver.

With the Power Pocket, the220-M Hz operator now has thesame advantage that he had ontwo meters: the convenience ofa hand-held and the punch of amobile rig. Styled essentially thesame as the two-meter version ,the 220-MHz Power Pocket offers a large speaker, an audioamplifier, an rf power amplifier,and a battery charger thatmeets the current requirementsof the radio. For example, youcan use the amplified hand-heldin your car on the way to work,hold your own in any 050, andarrive with a battery that is stillcha rged . .. as good or betterthan it was when you started!

EARTH-STATION RECEIVER

Channel Master has just introduced a new Earth-station receiver, the model 6128, offeringa wide range of features and advanced electronics. The receiveris a za-cnanne! synthesized unitemploying a single oownconverter installed at the dish and areceiver un it located in thehome.

For simplified tuning, the fu ll24-channel number format isdisplayed on the receiver's LEDdigital channel display. Channels are power-selected by Up/Down push-buttons and finetuning is provided with the assistance of t he Center/F ineTune meter.

For further informat ion, contact VoCom Products Corporation, 65 East Palatine Road,Prospect Heights (L 60070.Reader Service number 478.

ucts for the amateur 220-MHzband: a "two Watts in, twentyWatts out" power amplifier witha suggested list price of $84.95and a "Power Pocket" for theteem IC-3AT hand-held transceiver with a suggested listprice of $229.95.

NEW FROM YOCOM

scanning of both 2 meters andthe 160-164-MHz band.

A high-pass input filter and a2.5-GHz transistor give very highuniform sensitivity over both the154-158-MHz and 160-164-MHzbands. Each band is crystal-controlled for excellent stability.

A Bypass/Off position allowstransmitt ing through the converte r. It is protected againstburnout if you transmit (up to 5Watts) with the converter on.Short direct-signal paths givelow insertion swr.

This compact converter measures only 2 'I.x1'hx1 '12inches and weighs 4 ounces. Asingle AAA battery (not included) gives you months of operation . The cabinet is black and ismade of rugged. lightweightaluminum for years of hard use.BNG connectors mount the converter directly between yourhand te-tatkfe and antenna without cables.

For further informat ion, contact MFJ Enterprises, Inc., POBox 494, Mississippi State MS39762. Reader Service number483.

MFJ-31 3 POLICE/FIRE/WEATHER BAND CONVERTER

FOR 2- METER HAND-HELDS

MFJ has introduced its newcompact VHF police/fire/weather band converter tor z-meterhand-helds.

It turns your synthesized144-148-MHz hand-held into aooucenrre receiver (154 -158MHz) and gives you di rect frequency readout on your handheld, A programmabie scanninghand-held becomes a sensitiveprogrammable polic er tirescanner.

You can also receive weather,maritime coastal, and more onthe 160-164·MHz band. Feed- VoCom Products Corporationthrough allows simultaneous has announced two new prod


gram is $100.00 ppd in the USA.Ohio purchasers should add 6 %sales tax. Foreign prices wi ll depend on the additional ex penses of mailing. This pricebuys a printed copy of a thorough user's guide of about 60pages and a 5 'I. " hard-sectordisk with the absolute binaryMORTTY program.

For further information, write"MORTTY program" or " Phi llipL Emerson" at 3707 Blanche,C/eveland Heights OH 44118.Reader Service number 480.

REVIEW

Com- Rad's Mob ile Ear antenna.


factors (1.34 with VBT off), and acombi ned ultimate rejection ofabout 80 dB leave much to bedesired.

Under the same conditions,the Fox Tango filters (botha-cere discret e crystal units instead of the original monolithic

COM-RAD INDUSTRIESCR17 20A

" MOBILE EAR" ANTENNAS

Jim Waldron of Com-Rad hasbeen interested in space-savingantennas for a iong time, and hehas built and tested dozens ofthem with the idea tnat a betterantenna ca n be built and ismuch needed. Jim's idea of a" better" antenna is one that issmall, compared with a full-sizeantenn a for the band selected;one that is rugged and has a lowprofile; one that is easy to tune;and one that is duck soup formobile operation, yet may beused in portable or fi xed operation as we ll.

At fi rst g lance, the MobileEars look something like a crossbetween a giant co il and a shortdipole, and that is almost exactly what they are. The raroe-ote meter helix is resonated to Irequency by the capacitance-toground of the adj ustable "resonator" - a capacity hat which isbasically two telescoping whipantennas mounted above thecoil and parallel with the roof o fthe automobile. The helix radioates vertically-polarized rf energy in the radial, rather than axial. mode. , . similar to that froma conventional vertical antenna.

The CR1720A comes from thefactory with a large magneticmount that will defy almost anyattempt to remove it accidenta l·Iy from the roof of your car onceit has been placed in position.The shunt feed has been tectory-preset to provide the proper50-Ohm feed point impedance,and a UHF chassis-type rf connector jSO·238) is located on thecenter support pillar just abovethe mounting base. A lthough itis normally used with the magnetic mount supplied by CornRad, the Mobile Ear can be usedwith any mount that is connected di rectly to ground, such asgroundplane radials or the like.

and ce ramic types) each have abandwidth of 2.1 kHz (net bandw idth of 1,99 kHz), a combinedshape factor of 1.19 (the lowe r,the bett er), and an ultimate rejection greater than 110 dB (thehigher, the better). The effectsare even more pronounced when

The reason for this is that thecoaxial cable is connected tothe antenna rather than to themounting base; for proper operation, the base of the antennashould be grounded. For exampie, you might wish to replacethe magmount wi th a pennanent base for the home station,and this can be done by usingthe 3/8-24 bait at the bottom 0 1the antenna-the one that themagmount sc rews into .

The CR1720A comes ccmpletely assembled ,except for attachment of the telescopingwhips to the top of the supportpillar. This is easily and Quicklydone by sliding the setscrewends of each wh ip over the5/16-inch stubs a t the top of thesupport pi llar an d tig htening thesetscrews.

After you have mounted theantenna in the desired locationon you r ca r roof, connect an swrbridge in the line between theantenna and your transceiver ortransmitter by means of a shortlength of coaxial cable, placingit as c lose as practical to the antenna itself (within two or threefeet),Set the tel escoping whipsto approximate ly 50 incheseach, and set your transmitter tothe desired operating frequency. Apply a small amount ofpower and look at the swr. Smallincremental adjustmen ts of

VBT is used to narrow the operating i·f bandwidth to reduceQRM.

The matched-pair fi lter k it ,complete with detailed instructions, two 2. 1·kHz Fox Tango filters (guaranteed for one year),and a ll needed cables and parts,

whip length by sliding the endsin or out (ou t-or longer- tolowe r the frequency and in-orshorter-to raise the frequency)w ill quickly provide a 1:1 vswr.Observe the lowest possible swrthat you can get w ith your partic ular vehic le. If it isn't lessthan about 1.5:1, you can movethe clamp ring of the shunt feedin tiny increments to achieve aperfect match, In the case of thetest antenna, this wa sn' t necessary, as a perf ect 1:1 match wasobtained immed iately.

I checked t he bandwidth afteractitevtnq a perfect match andfound that the frequency couldbe moved 65 kHz in either direction from the resonant trequency without exceeding 2: 1 vswr.This means that wi th most rigsyou can operate over your favorite phone or CW segment of thezo-meter band without any reotuning at all. Of course, if youare a perfectionist, you canachieve exact matching at anyfrequency within the band . . . nosweat.

In the case of the lest antenna, the inner sections of thewhips were full y extended andthe outer sect ions only partly extended. This gives the largestpossible diameter at all t imes. Iresonated the antenna at 14.025M Hz an d found each whiplength to be exactly 53 'I. inch es,measured from the su rface ofthe support pillar. On the phoneportion of t wenty meters, Ifound that 14.3 M Hz required awhip length o f only 48% inches.

is being offered at an introductory price of $150 plus $3 forsh ipping ($5 fo r air),

For further inform ation, contact Fox Tango Corporation, POBox 15944, W. Palm Beach FL33406; (305)·683·9587. ReaderService number 477.

This is likely to vary slightly fromcar to ca r because of the outerent sizes of roof area, etc. A st ation wagon, for exam ple, willhave more groundplane areathan a tiny subcompact, butboth wi ll work !

No doubt you are anx ious tohear about results, and I won'tdisappoint you. The twenty-meter Mobile Ear really works. A ftertuning the antenna to resonance and firi ng up t he 73FT·707 transceiver (with my 1980oros Omega parked in my driveway), I found myself in the middie of the WAE contest on Sunday afternoon, August 15th. I answered many calls and receivedrepli es from each one. A ll were599. Now, I'll admit th at th is isoften the case in a contest, tomake thi ngs easier lor the reportgiver, but I got an answer to thefirst call every time! Not onlytnat. but when I called CO I gotanswers, too. In the space of on. 'Iy a few minutes I had workedUT5, U02, DL7, Ol1, OH5, UK5,G4, N9, K~ , and W4 lands ! (Naturally, the US stations don' tcount, but I wanted to t ry the antenna.) To date, I 've not donemuch with phone, as I am predominantly a CW operator.However, a fe w contacts uparound 14.300 have been madewith good results- G3, for example . , . eno others.

I noticed that the noise pickup 01the antenna is su rprisinglylow compared with other verti cals I' ve tried. One possible ex·planation could be that the co m-

........

editorial by Wayne Green

W2NSD/iHEVER SAY DIE

ponen ts are hortzontauv-contrqured and thus less subject toman-made or natural ORN.

I should ment ion that theCR1720A is beau tifully madethe helix is heavy-duty atumtnum tubing and the whips arestainless steer. The supportingpillar appears 10 be heavy-wallPVC and the magmount ischrome-plated steel. Everythingconsidered, the CR1720A is avery fine portable/mobile/fixedantenna, one that the 73 staff

{rom page 8

a lot. I suspect , It read: C/OfTH ElFASTE I ETIG ROWINGIAMATEUR/RADIO/MAG AZINE!rnet's operculilorm sending... and does not surprise us.

BUNCH GETS BASHED!

The recent Bash debacle inBaltimore should put an end 10the fantasy thai Bash is doinganyone any good except Bash. Ialso hope it will shut up a lot ofthe hams who are moaningabout the code and ignoring thelact that Bash has totally doneaway With any need for technical competence ... or at leasthad until the Baltimore epic .

As usual, Bash collected hismost generous fees and setabout helping a large group ofhopefuls 10 memorize the answers to the FCC exams. Hedrilled them thoroughly, as always. But this time the FCC hadmade some very minor changesin the wording of the exam, withthe result that 89% of his groupflunked. The word is that thechanges were small, such as insome of the values in the mathproblems.

One of the new questions forthe General class had to do withthe yagi antenna, asking whichway it radiated energy. Only oneof the Bash trainees got this oneright! We're dealing with massive ignorance of amateur radiotheory, not superficial ignorance, with these memorizationsessions and the Bash books.

really liked. You ought to knowthat the antenna doesn't need tobe removed to put my car in thegarage, so yours shouldn' t needto be removed either, unless youwant to. In pub lic parking facilities, just slide in the whips, remove the coax, take the MobileEar olf the roo f and stow it in thetrunk. It takes about 20 seconds... and, best of all, it can be remounted and ready to go inabout the same time. In mycase, I ran the whips fore and aft

You know, I've been writingabout this problem for quite along lime now and I've had eimost zero response from readers . I have yet to hear of onesingle case where an amateuror a club has protested to aham dealer carrying the Bashbooks. Not one case of an ira teham tearing up the books. Noprotests to CO for carrying theads fo r these pernic iousbooks, No, it is obvious tha t noone rea lly gives a damn wheth·er a newcomer to amateur radio has even the slightes t teenmeat know ledge or even t heabili ty to pass a fair test . Sowhy all the fuss about Morsecode? Am I talking 10 a bunchof hypocri tes?

The Bash books and the Bashhig h-priced bli tz weekendcourse are designed for onething: to help people cheat atthe FCC exams and bypass theentry requirements. As long asyou don't care if people cheat toget a ham ticket, why should youcare whether they are sold bySears along with a two-meterHT? 1 don't see any difference,do you? If you really, sincerely,believe that people who cheat toget their ham licenses are suddenly going to be wonderful andproductive hams once they getthe magic paper from the FCC,then you also believe in thetooth fairy and that Congresswill balance the budget. In otherwords, you're crazy.

Frankly, I'd rather see Searsmaking all that money Instead

parallel to the car's centerlineso that they wouldn' t be st ickingout into the side. If you live in anapartment or condo where outside an tennas are forbidden,you might l ind one of the MobileEars to your liking.

By the way, the " 17" part of1720 means Ihal this antennawill also work on the ta-M Hzttr-meten band whenever thatbecomes available to amateursin the United States. The

of Bash; at least we would havemore than a tiny dribble of newhams. Bash, despite his heroicefforts, has only been able tobring in a few thousand newhams lor us. True, he's probablyresponsible for much of the fewwe've had. But if we are going togo along with the Bash system,which you have whOleheartedlyaccepted, let's go all the wayand get some mass merchandisers into the act .

You've seen this thing happening and you haven't done adamned thing abou t it . Whyshould I have any respect loryou? The hypocrisy over thecode just makes this all themore irra tional. And don't try 10tell me that this is all news toyou. Baloney.

NO SECOND LANGUAGES

There has been a liberallyfueled effort to cope with the inrush of Hispanics by allowingthem to con tin ue to use Spanishin school rather than force themto learn EngliSh . Fortunately,there is now a ga thering movement against this policy. Weshowed that the "meltinq pol "system worked in America andthen we tried to ignore it.

The more we keep newcomersto the United States able tomake do Without learning English, the more we are takingaway from Ihem the benefitswhich they presumably camehere for. I'd like to see ourschools teaching foreign Ianguages, but not catering to students who do not have a soliduse of English. I'd like to see thepublication of foreign-languagenewspapers and foreign-language radio and television programs discouraged.

The lesson in canada of howdifferent languages split a country should be heeded. When agroup in a country holds on tightto its language and culture, it is

CR1720A is one of three MobileEars which cover 12115 meters,17/20 meters, and 30140 meters:versatile, indeed, The CR1720Alists for $55 plus $4 shipping,direct from the manufacturer.

For further information, contact Com-Rad Industries, 1635West River Parkway, Grand ts land NY 14072. Reader Servicenumber 487.

Jim Gray W1XU73 Ma gazine Siaff

a disruptive force. Americansliving in other countries tend tost ick together and avoid learning the language as much aspossible. This hurts both themand the country in which theyare living.

The Indians (ASian) have longhad a problem with this. In everycountry where there are a signif·icant number of Indians, theyare clannish and generate resentment wilh the o ther people.We don 't have many Indians inthe US, so we are not aware ofthem, but we do see the Chinese, who have the same problem. For many years we sort ofaccepted that the Chinese forsome reason don't know English and run either laundries orrestauran ts.

Both the Indians and the Chinese are very hard-working peepie and, I suspect, if either grouphad made an effort to integrateinto their new count ries, theywould have virtually taken over.Of cou rse, Americans used to behard-working people .. . and afew still are .. . but for the mostpart I see few remnants of thisheritage. Perhaps we are mostfortunate that the Chinese inAmerica are so clannish andthus are kept from enjoying andbenefitting from our educationalopportunities.

We stilt live in a world wherehard work pays off. This is oneof the reasons we have so fewwealthy people. Given equal opportunity, I suspect that the USwould be as proportionatelypopulated with wealthy Chineseas it is wealthy Jews. In Taiwan,Hong Kong, and Singapore, wesee how well the Chinese can dowhen they are not held down byCommunism. Perhaps we arefortunate, in a way, that the political systems in China havebeen so destructive. I'm surethat the Chinese could, if work·ing in a free country, run c irclesaround us.

140 73Magazine . November, l982

ayne Green Books

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73 Magazine .. November,l982 141

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SUPER LOW PRICES!AZDE~ PCS.J.OOO 2-1\fr:n:f-\AZDEN PC5-300 2-M ETER HTSAJ'IOTEC 144 UP 2-M ETE R HTSA~TEC 440 UP H ANDHELDKENWOOD 2500 HANDHELDYA E'S U FT-208R 2·METER HTYAES(J FT-708R 440 HTTEM PO 5-t5 2·....1ETER lITT EM PO 5-2220 HTALL KE NWOOD & ICO,\1 II FOFF.ALI. LARSEN 2·METER ANT EN NAS 15%OFFALL YAES t! & T EN ·TEC II F RIGS 15% O FFALL IIYGAI N & H USTI.ER ANT. 30% offAU. MFJ PRODUCTS 15% O FF USTRADIOS, ANT EN:-':AS & ACCESSOf-\I ES AREIN NEW FACTO RY SEALED CARTONS,FU LL M AN UFACT U RERS W ARR ANTYPRIC ES CASH & SHll'P1NG C REDIT CA RDSA[)D~%

SHA VER RADIO, INC.1378 S, Bascom Ave . San .lo ....·. ('a lif. 95 t21l

401l ·991l·1103 v' 148

FROM TAVCO . . .MAGNAVOX FV 25 - 26 C H AN N ~L

CARl F TV CONVERTERand REMOT E C ONTI\OL

Get The Most From Cable T'"

VHF-MIDBAND-5UPERBAND• s-:t. _ ~ ....'" _ p.,ohbynon I~

fmm up 10 25' aw~ • Pow,..,l Ie< _ -..om TV• s.r- _ . on TV _ . _ coolly ~.• _ lor l hoo~ • E_ 5 minuhI __

• ""'_ 1"'- WIl6 ~. ,our TV c.n' Il'I'• _ . w~h ." Tv • 110 0., G....-.t.. _"""""'"

2 c_ orII)r~'.-' ........,1.. 2 ,'19 Mal o..s., SPECIAL

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TAVCO COMMUNICATIONSA3 · I 46 A Na" o w. Ck Ad, - Co,n,ng N Y, 14830

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WANTED FOR CASHYour Military Surp lus Elecuoic

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Call Collect NOW201·440·B7B7

35 Huta CourtSouth Hackensack, N.J. 07606

SPACE ELECTRONICS Co.Our 22nd Year

v'16 2

$22~

+ 2.50

:'0 COD OR C REP I T CARPS .ALL O RDI: R.; IIJ us F UN DS .AU. FORElG~ ORDEP. R " 0 0

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q<'~<;:C L EANEASY TO USE! SMOOTHBUILD CUSTOM BENDS TOCABINETS YOU'LL BE 90·PROUD OF I COMMERCIALQUALITY at 1/10 THE COST Ii

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THE t£ BRAKE

BEND ( .& FORM ~~,....c':C/.060 ALUM.& STEELI

ZASSOCIATES, 0 101 757305 0 N£ 55 TH AVI .51LVII S'llHGS • fLA. 32...

lA rk, re",lt-nh ",Id 4"101o.-. Ief Inqu",e, InvnM

H99'i pju, '1 . SM lO<>mo o.,k....,I.ble

LANNES JOHNSON100 PI.,. St,.-..! West Helen• . AR 71390

I·SO I-571-7511TIli-80 VEIISION " V"I LABLE SOON

A Great Circle Calculator plus l og in anApple~ Computer. Information on 467specific worldwide locations (31 8 + 50states + ...I. Enter your coordinates andDX TXT Will calculate the short pathbeam heading and distance from yourQTH . Any location callable by Prefix,location name. or record number. Databank includes geographic descri ptor,specific location, IRC, and Zone.

DX TXT 1.0

Requires an Apple" Computer with oneDisk II and DOS 3.3. Pri nter funct ionoptional.

IS>Zll 1, 82 0 ]S900 IS600 'S~ ! ,~ F'IOI FlIOI F~I

F11'd) I/W lOO •••••• __ •__• "' 0''''. ' ''0. ' ' IllS.OO

"ISS .... " . "K'~ """ ' 32S " . " , ' R_. """ fRD' ' " '' '' ''' r i l OO ' 11' 00 1~"fT SOO ~ 510 ' " ' IOO -lGI ' SB 1~ - lOQ

":;j\300-}{)3 'H ~I68U . - .............lL. ,.." • ["0 . -- Il1S ,OO

l C111 '0' fJl?l l ' Rl . 10 ." 1'. , FI111 11100. I 01 6, " · "\,00SUD U,S. (~ I [ Rs , HECK ~ ~ , O .. JO!IA' '(I<ll BACK , ",. ..,"'u" ' O.f''' . ",T' .,T ' 000, ""," -e , '0' L" O'''''O' ,."T! Jf lOU. ' '''' '0""'" "§f'D··' ''' ""'. ON' '" """T'.

GRANO SYSTEMS

10 'II;S.!J DIG ITAL DISl'lM 5 (~\'[llrD fOR YIlESUK[N~OOO IU~

(I.l W '; MD DRAA, IRM(E II'lRS IlI:CEI\'[ RS IXD nl!lllS ~ l mRS.

S ACllvr IU LED DIGITS IlI:I.[I ~~ TO 10 Hl. IUR PloII(l 10 ~ ,

DI.] T DlFl AT IW :l tH . FRO'. COlD MAl. 100 ~, ONlf! IN2' 'IS.I ve- HI(,/< , , Ill ' ~ I ll ~ , 112' tu r. STEEL CAS< ]S SlACK ,' ow, , F'""' '''f ' " '..,.., ",.,,"", ""'T' .00 ""DE' "" " . ,u,",'c''' ' 000' . " ",, , .., 1. " OLC" iOO . ' ...,.,.. "'O""TI" "e., "" T", " "0', ",'>u' " '''' , ..,,,,,. ".", """, ,,,",/"" """"'_...., 0" ' .If," , 'l' "',,,,, 'AI.,,. ,ou. " T" "" " 0 ,.e, " "'E' '00 • " 0.•,<.oo lOA''''lt ' ... ro. ,"",-El,,"'" ''''01 ,,,. "D--- -- - 1>. 00

<Ii' ! !*"t' fIlii 'sS1~)r ~\, " 00 L. 'O"~'A ,.c. roo11 1 X, iN I, 5.,',6 . TA, ,,,,.. ",O","D, _m_ 11 10 .00

CB TO TEN METERCONVERSION KITS

10 METER FM- limiter disc rimi-nator board with specific rnstruc-tions 10 iii over 80 different AM &sse chassisSSS·AM KITS- Now '0 slockkits for most CB models- 23 or 40channelsNEW & USED- FM- SSB- AMconverted C.B:s in stockANEXTER MARK ANTENNAS- You saw them at Dayton. Now instock the HW·3 three band helewhipthat covers 10-15-20 mel ers withno tra~sFRE CATALOG - Write or calltoday INDEPENDENT

CRYSTAL SUPPLY COMPANY

141 At. M , Box 183Sandwich, Ma. 02563-0183

(81 n888-4302~"

$14.95118

REMOTE 40 CHANNEL C.B.Remole . ~ a. p • meta ' Itame Spea_e,~ 'as"c case , an d conl<o' m,c no! ,nCluOe<!So'o a s ,s

C.B. SPECIAL(Repeat of a se ll out)CONVERT THESE TO

10 METER FMNe w Hy,Galn ~O c~annel ~fIn t"a COleu ,1boaros a~.embl , (Squ@IC ~ ~ol. volumecontra' and c~ an ne l sw,lc h nol ,nc luoe<llBoa ras so ia as ' S Q,me nSIM 6 " ~6 "

1-9 PCI $1 .50 ••.10-49 pcl $8 .50 ••.(WMe qua nHlin 1" 11

C.B. BARGAINC B t>o a' a s m,n ,ng ~arts or oa ma ged<:: a n be useo fOf spare pa" s Buy se_er aj' ,

$3 .50 ••Oroe r ,nlo,ma" on Plp••e aOO 50 00 to'SIH " a UFS COD's acce Pleo to r o'ders10l al lng 550 00 0' mo re Flo"oa 'eSloen1§ad d ~ '" • .sa les :a ' M,n,mum oroe' 5 '5 00Fo' e'gn o,oe,s US lunos only ado 2\)" , fo rSIH MASTE R CARO a no VISA accePl ed

Surplus Electronics Corp.7294 NW 54th SI.Mia mi FL 33166 .... 69P, H, ' 305·887-a228

10m 'lOA AI'[ ,

LMGUI ~.C

'''''Q' VIA1'~

FRE E T RI ALYAESUHEAT HDRAK ECOLLI NSKENWOOD

.- 132P.O. 5~' ,lIl

BlAI N< , ,,,H.I! I ,A 'lillY!

° 8 ..lIt In Too.tFun ction.

° 20PqeTechnIcal Manual

° Work. with an,.t y pe n d lOtl

° Complete T i m e rFunction.

TRS·80CbOard

$ 9 9.00 ass embledboard

...,-

VIC-20board

•PORTA PEATER

Atariboard

_.----

-- .-~-_.\ ".- - - - -. ' .-:-, -

MIOOAINSTANT REPEATER

ANY BAND ANY MODE

"On-The-Air"IIIIIIIIIIIIJ

II~Kantronics

I1

The Interfacet m

SUgg_ Price $189.95Your personal computer becomes a complete CW /

RTTY / ASCII send and receIve terminal With The Interface IInkln91t to your transceiver.

If you own an Apple II or Apple II PlUS, Atarl400 or 800,TRS·80 Color Computer, or VIC-20, The Interface willput your computer "on-the-Alr".

SoftWare for each system features split screen display, buffered kevnoard, status display, and messageports. Attach any Centronics compatible printer forhard copy. SOftware Is available, on diskette for the APple and program boards for the others, at an additionalcost.

Applediskette$29.95 $49.95 $49.95 $59.95

5ee The Interface at your authOrlzea Kantronics deal·er, or contact:

°VOX o r CORopera t ion

• 4 Ch annel PROMCW I Der

°250 ...o lt.wttchlllll:eapabillt y

$ 1 7 9.00 assembledunit

°An butant

R e pooater (Fully tested. programmed. assembled) .... 302

W-S ENGINEERING P.O. BOX 58, PINE HILL. N.J. 08021(20 1-8 5 2-0 2 6 9)

PORTAPEATER<9

L<9131842-7745 1202 E. 23rCl Lawrence, Kansas 66044

--------

IIIIIIIIIIIII

1952 Clinton St .• Buffalo, N. Y. 142061-(71 6) 824-7936, 9t04 ... 143

All Pnces Inctude Shipping and Ta. In the U,SAAL L DISK are WARRANTE D agaon sl mil l e" al derecte for 90 days lrom date o f purchase.

_ 5 1/4 Inch D,skeltes (SOft sectored]. Center Re on.forc ing Rmg. Jacket and plashc box-stand. = $21lor bo" o f 10 to 20, 20 10 100.5 $25 per bo__ SYMTEC HIGH RES LIGHT PEN -Wllh soli,

wa re = $18 5.00_ 16K RAM CAPO lo r 'he APPLE If Of II ..

BARE BOARD = 30.00_ PADDLE·ADAPPLE only: $27.50_ MAG IC KEYBOARO only = $86.00_ MICROBUFFER II Fo< most pnntl!'lS 32K =

$250.00Epson Para lle l 16K "' $135.00Epson Se"aI8K = $135.00

_ ECH O II Speech SyntheslZI!'I w,th Sollware on33 d isk and Speaker = $170.00

_ THUNDERClOCK PLUS With sol1ware = $125.00BSR X-10 INTERFACE OPTION = $45.00OOS-DATER DISK = $20.00PASCAL SOFTWARE DISK = $20.00

_ RAM OISK·320 = $1225.00Advert ised in SoItTal k

_ I Will carry otner rteme on the ful ure. II you don'tsee whal you need let me know Comong soonVISA chargIng and computer ordering

Mos. products carry a 90 day warranly_The pnces may change Without notice

Please sena ORDERS WIIh p,aymentand onQUlrles 10:

GLBHIGH PERFORMANCE

PRESELECTORSMODEL pso 10 P500

CiLB ELECTRONICS

- " , BIT " 0" BYTEP.O. Box 60972

Sunnyvale, CA 94088

;?: ;?: BIT no" BYTE :C:::C::

• 50 - 500 MHz• Ultimate reject ion over 80 dB• Five large helical resonators• low noise• High overload resun nce• TypiCJr rejection ligures :

::!: 600 kHz at14o' MHz : - 30 dB::!: 1.6 MHz at 220 MHz : - 40 d8::!: 5 MHz al450 MHz: - 45 dB

• The solulion 10 inlerlerence . inlermod andeesens problems on repealers

• 12V DC operalion• Dimensions onrv 1.6 l 2,6 l 4.75 nclud-

ing eennecters• Custom nmee 10 your lreq uency• low eest - only $69 .95• Allow $2 .00 lor shipping and handlingWe h.a-.e a complele eee of tnnvnmer and r8C8lV'er stnps and syntheSIzers lor Amateur and conmerClal use Wrote or call lor our nee calaloQ

w. welcome Masler card or VISA

BIRCH HILL SALESPO. Box 234 · Peter borough.NH 03458

73 MagazineSubscription Depl .PO Box 931Farmingdale, NY 11737

73 Magazine does nOI keep suuscncnon records on the premises. therefore calling us only adds t ime anddoesn 't solve the problem.

Please send a description of theproblem and your most recent address label to:

$ubsctfptionProblrol.?

MAGAZINES<single copies)

By"JbpuIar Compvli"9O STHomRodio7J80 Mic.rocompu~

~TopC~ling

MAPSARRlAR .CaMbooI. Co

--.-.....

CODE TAPESblronic sARRl

:t~~SHOP BY MAIL~~~ SPECIALTIES-,<,~=."". __ Q5L C"mh

_ ._ log BOQ!<s,

BOOKS Coa~ _ 5eol5'or50'rolh.

Dick Bosh' Co-ereroll Dull CO'tertARRl73 BooksCollbool< Co,

RIG TROUBI. ESGO T YO U f)OWN?

NQ SERVICE CE:\T ER14910 I.G Bh-d .

Los GIiIOS. C A 95030

-YOU COUt U SHI P YOUR RIG TOTH E ..ACTORY t'OR Rt:PAIR.

·YOU COL: U ) SIII P IT TO RQ SERVICE CENTER "'OR REPAIR.

-O UT YO U ST A :"JI> A GOODCHA~CE 010" nXI~G IT YOUR·SELf WITH IIEl.P f 'RO,", YOURowx copy 010" "OW~ER REPAIRor RAmo EQUIPM EST"

-THIS BOOK WILt BE SHIP PEDPOSTPAID .·ROM K6RQ FORSS.95

QUALITY - ECONOMY

All DX products are fully gu aranteedSend la rge S A,S E. for f ree catalogDealer inquiries are welcome .

this publicationis available inmicroform

-----------

NEWOX

ANTENNAS

WE MANUFACTUR E ~

MON OB AN D YAGI B EAMSTRI BAN DYA GI BEA MS

CENTER INSUlATORS · BAlUNSDUM MY LO ADS - AN D MORE'~lU~ t • • p T. .. P.. f" on" ' u . G., ,,.. ,

I l OO' P.. l , .. . '" "., ••••• •••• , ..

(D O' to.n",., ••, ,' ...... 1,,"H"'e, " "

D'·."",' ~ODG ' DIet I • • • ' .o'~ (o~ . '.'~,'

' SE' I_ . ' " .~ • ••d'to.f' ••~d (0' ••• '' l og t"~ •• t ••~ 01 (.1I"g.'

',ou On' ••, .. ,0. · 0. " ••• h'.,'

~ •• ••0' · l . d ,." ,' ' o« ' p ' ou l l"u...~'' So..~ , ~ •• , • • ' OU. , •• ld ., 1....g• •

· :.. u CO",.,." ' I ' U 10•• ' CO Zo••' u. ' o. ' ,. 0" , . , '

' Lal' '.d. · \ o . g ' ,.H'

PlUS I.tv ".h"d '0' ' ].ut QI"'

' I i . , 10", Di ff ....C~' · p ' ~o " ,, ' o . rH 'O"

· O" t . ftC , , . " 10. " " " · D....." ,. Mi T,, '' ! Iln I ... "... ,. ~, . l.cl.d, •• 01 ' 0 To. !

PRE SERVE

19 ...J,t.\,Q,t.\:lJr-JlBINDERS s

FILE CASES

University Microlilms International

300 Nort h zeeo Road 18 Bed fo rd RowDept PR Dept PRAnn Am or, MI 48106 London. w e 1R 4EJUS.A England

Keep YOU' ,,,sues 01 13 Magaz '..... logelt\e'f . toand~

and PfOle<:led In handsome and dufable I'blary h~or D"",""s Booh 5l~les tIound ,n 'ed Ieilott\e'fe11e ..UI'lthe maqa>",..... lOgO stampe(l ,nF,~. [ ;och to,,,

lor "as~ ,ele.6 lor S3000

NEW!CATA LOG O F

HARD·TO-FIND

PRECISION TOOLS

.-

-Also c o n tuins ' f!'S' f!' q u ip rnf!'n '

plus ..,ide- se-Ie-c , ion of100' k its a n d c use-s

In: III !I 1111 I t; t ••P.O. 80X ]7. Loc on .IL 6" . 0

Phon. I 309 )H6 · 2017

H MO c. l l, • •••• ( .. .. ... I, • • /0",. OTH In ' "

Il .'i'.d. ! l o . ~ j, ••• QB O, ••et io. ! Oi".".f, • •• , . ..., to., lJ >•• • O' H) .,,, I l l .IOP O.

10' 00 C, 'l ." ll l!

I. nd . l l 1'"•• _ ~ . 6 "O (8081 ~'1·'111 ( la-OU)

00 B~ . 1~8 819, '080 (0 ' - 111)

•• n" ' . , . H•• " • •• • " h I li li S' Me .... 147

SALE SALE SALE

Last Day·Dec 31 ST

1982CALL US!

If we have what you want in stock

GOING·OUT·OF·BUSINESS SALE

ship it FREE!No charge cards .---+-_..............shier's check

144 73Magazme · November, 1982

POWERSUPPl.Y

,.""'ORE'

, . , $279,00, . , $229.00

Post Paid

"'OOEMBOARD

SINGLEBOARDCOMPUTER

Reqwres TR$-BO, MOD·III w,lh your CALL SIGNplus TV Wirtl 60ma loopDISK 110, VERSION .. , ., ., . .. .

CASSETTE 110; VERSION

CommTek

CONTACT·BO ...An ult ra soph isticated yet simple tooperate RTTY Sys tem for thedem andingoperator at an affordable price.

Features:' Disk 110; SA VE, LOAD , KILL" DIR. TRI·SP LIT screen, user delined ." 0 CANNED MESSAGES' DYNAMIC BU FFER ALLOCAT ION• Liye HARDCOPY l or perell el prin ters. Keybo" d CONTROL 01 STATION . , .·AUTO·lD; RTTY , CW (selecl.ble ONIOFF) ,' CLOCKED OUTPUT r,le . • .·AII BAUDOT .peeds piuS ASCII (110).·NAME. DATE, TIM E lrom cDmptller .' On sc reen BIT PATTE RN SCOPE .

4493 Orleans Dr., Dunwoody, GA 30338(404) 94&9314

PACKET RADIOTREASURE TROVE

SURPLUS FINANCIAL TER MINAL CONT" INING;• 202 TYPE "'OOEM BO"RO, 0·.800 t>au~. ..,pa,a'~ 600 ""'"

audio ,I",,". TIL oog'" I 0, 5 .5.5"

• 8080.0 CPU BOARD: W,'" soc'''', 10' "'a ~10!!•. AI",,",OO<"-et., 82" p,agrammablo Cornmuo<c.';oo, lo 'orl"""rUSAR TI, 8253 T" pie P,og,.",,,,a"'~ Into rva l T,,,,",, l:\2~e

Sv.,om Coo" ",''" 3-..al~ Buo 0""",. 256 bylos RAM . 29 O1h",""pp;>(! IC. , .'.1, oiCc' IC. ? 5 . '0'

• ENCLOSEOPOWER SUPPLY, W'lI1pw' "",d &.w" ch + 5V'" 2 ,A. + 12V ,,, 3f>Oma, - 5V ", 2f>Oma, "'0$ 2 o""'\lulated"""a g<>$ fo, " ,,,,lay 3 . 4 , 8"

• DQCU...ENTAnQN PACKAGE: ',""Iucleo",*,"",""", & Tech·nic.!ll'v O<,on"," UM! M.nu",

• MISC.: 20 kev Decimal & FuncllOn K....""a'O, '6 Dog" n .• ,'o"0....1 O'OPIay , "l og S' " I'" C ted" Ca'" Reo_ , Spe. . .. and

~"Unit, a", "'nlOY<>O ,,,,"' ....."'" an<! " goo<' """'ng rond"",nH'\l~"o."y",o,',,,n ron'''o<'''''' "''OVII'>OO' Each " g,,,,,n 0 'o iloff·'no I.", ""r",oshll'fT>"nt large "U""'''' '0 $lock. You ·d '0", '""'-'V 0 lot of ,""'ov. baloro I,oo"'ll a"",,,,,, go'" ''''0 thIS

PRICE, SURF"CE UPS INCLUEO $55DOCUMENTATION PACI<AGE $5

• AT&T

.... 311

MODELSG100D$349 95

plullh ipping

THE PROFESSIONAL,

TOUCH TONEENCODER

_SINGLE BAND HC - V220

VANGUARD LABS10$.23 Jlm,lci A.I., H oUle, NY 11423

Phon. : (212) 468-2720

MADEINOS,

PATENTED

• coverstoe to 185 MHZ in1 kHz steps with tnonowMel dia l - Accu racy 1 part per 10 million at all Ire quencies - Intern af fM adjustable from 0 to 100 kHzat a 1kHz rate - Spurs and norseeueast ec dBbelow carrier - Rf output adjuslable from 5·500 mv at50 Ohms - Operates on 12 vee @ 1/ 2 Amp . Ava il·ab le for rrorn eoete delivery · $349 95 plus shipping• Adu-nn Accessories availab le to extend treq.range, add mhmte resolution, voice and sub-audibletones, AM . prec ision 120 dB cal ibrated anenuator- Ca ll lor details . Dealerswanted worldwide

l»lpa'80mmunications ®EmphasIS IS on Quality & Re~lIbiIiIy ",. 300

'L•"'-J ~~ An ultra high quality

encoder for professionalapplication. Absolute reliability andfunction makes the difference. There's aPipo encoder for every system andapplication. Totallr serviceable, easy tooperate and instal. Call or write lor freecatalog and information! (213) 852-15 15or P.O. Box 3435, HOllywood, CA 90028.

ISOTRO N 2017 IN. HIGH

IsaTRO N 403 11 N. HIGH

NEEDS NO RADIALS ORMATCHING DEVICES

-----+SDTRDN ANTENNASTHE BEST THINGS

ca me in little packages...FOR 80~40-20 METERS

('

- COUBLE BA ND HC- V, HC -U2

M2 ENGINEERING'S

VHF H.I CONVERTERS

ISOTRO N 8054 IN.HIG H

BIG O N PE RFORMANCESMALL ON SPACE

lSI BllA l COM PANY ~\303) 687 ~ 32 1 9

STAR RO U TE FLORISSANT CO 808 16

- BI -LATERAL PROTECTI ON AGAIN STACCIDEN TAL T RA NS MISl3iON

FOR UP TO 5 WAT TS

........ "'- """.- :to, ..., ." "

PLATE TRANSFORMERSALL REMOVE D FROM EQUI PMENT WITH 11 5

VAC 50-6 0 Hz PR IMARIES :ITflUX02YY/129 - 2250 VCT565 ma (1785 WVI secondary11 5/ 230 V pr imary 6'1, .5'/• •4W ' , 32 1bs sh $34, 95I/SS·HW201p · 2000VCT 500ma11 ;'00 WV. 700 ma merrnmenn.7x5 '/' x5" . 321bs sn $30. 00' U 96211610 · 5760VCT32 1maOf 4BOO vel 475 rna 17150 WV)

115/230V prvnary , 9'1, x1O'I. xB'/, -. 11;' Ills sn $65 0053,3 ut 3500 VDC CAPACITOR - 10'j,x4 ,/,x3'1." , 1I mssn CSI , 4W3081 , NEW. $27.50ruaea-csec-ee B1IA $9.B13 $16 . 3B28 $6.504 ';' ~ sq. ROTRDN MUFFIN or Similar fans, 14 W.usec-cneceeo $8.95CHOKE '3CS57N/610 · 11 Hy 500 ma 55 Ohms. to KVlest 9x7x6", 421bs sh.: $12.50I/SS·P243 - 900 VCT 250 rna. 4'1,,4'1n3'/,',16 1bs 59.95 $7.951500 WVOC CAPACITORS · removed Irom equip B rnf5'/. x3'/. x2'j," $4. to rnt. 5'hx3'/n3" $5.Prices F.D B Uma. 0.' VtSA. MASTERCARD Accepled ,

Allow lor Shipping • Wrile fOf FREE CATALOGAddress nect. 73 • Phone. 4191227-6573

FAIR RADIO SALES ..... n10 16 1 .IUllfICA • au 1105 . LI MA, O HIO· 4,sI 0 2

Sh ipping Included

Calif. residents add6 .5% sales tax

HC-V220554.95HC-V

$ 47.45

DEALERSWELCOME

HC -U2$59.95

_nM -SQUAREDENGINEERING, INC.1446 LAN SING AVE.SAN JOSE , C A. 9511aCALL SA NDY 408·266·9214

- STANDARD BNC • USES S INGLECONNECTORS AAA CE LL

' HC-V • L OW LOSS15 4 - 158 COUPLING TO159 - 16 3 ANTENNA

oHC- U2 • "OFF" RETURN S4 60 -464 TO NORMAL480-484 TRANSCEI VER

OPERAT IO N

oHC-V220 • SIZE : approx .221 - 22 5 2x1 .5x1 .5

• WEIGHT:3 .9 02S .

73 MagaZine - November, 1982 145

(904)394-251 1(313) 278-8217

UG 176 Reoucer_10'$1.99so 239-1M5,8Q3 amp l ...se_2OIS1.50San~o 3V Li thl...m-$5,%Gould 12v 500 mAn AA Nicad101$14,50 100/$125.0010001S11oo,00GSC Reg, Power Suppl~35 AmpRack Ml List S227.oo

SALE 1141.00

D. C. Pug h WA6HYB46&0-125 Norlh Ai..... Road

Oc"Aslde CA 92OSf1

BEARCAT SCANNERS

I need information on . di ll ita ll,equent y read ou t tor my Heath HW-l01lfansce iv• •.

I n'l'e<l a schemat,e an<! any o l her a.al ~

a ble inlormanon on ,"'- T"plel model3ool~oscilloscope. t " nil gladl y pay eosts,

Wall Wilson WI LE4905 L.karidge Rd.

Dan ••• CO 80219

10000 0.1101~ 00 '" '00209 00'''~

Mark S. Klzluk N20MI2623 E. 11th St.

Brooklyn NY 11235

REGENCY SCANNERS

HAM HELP

Universal nrst .RAYMOND RICHARD

RT. 1, BOX 25ECLERMONT, FL 32711

All Bu~ 10'" p'ohle IC $o<;ket s just Ie poll' l>IllExamp" : 8 pin_Be; 40 Pin_oWeHam IV R01or-S165.ooCOlumbia 8 COn (2al~22)-l7cl1l,

COlumbia AG 59v 100 foil shie ld TV lype-7¢'fl.Berk Tek Gre ~ 96% RG eX_14¢IILUS made PL~_ 101S5,50

Call l or Quanti t y Quotes

I wou ld li ke to purchase an orogina lma nual to, . Tektroni. 3576

EHchl T,k_lld.1423 V...., Ad.

Aocklord ' L 81103

I~ a BIOftdet.To ng ue Pt ,sm.mat ,cPI,l ·2 '01(11' to complete my OSC....R-Suansce,ver IYIIIl1Tl (Of Ihe add'en 01lh,.company>

Slep Electronics CompanqP. o.BOX 100,~ 441 , DEPT. 73orro, NORTH CAROLINA 28763

~'"

SLEP ELECTRONICS

GIVES TOP TRADE ON YOUR USED . ...ATLAS COLLINS DRAKE ICOM

KENWOOD TENTEC . .. .AND ON YOUR USED TEKTRONIX ANDHEWLETT·PACKARD TEST EQUIPMENTON YOUR USED AVIONIC EQUIPMENT

AND ON YOUR USED MILITARY AVIONICAND GROUND ELECTRONIC EQUIPMENT

WE OFFER NEW FACTORY-BOXEDLATEST MODELS OF . .. .

COLLINS CUBICISWAN DENTRONDRAKE ICOM KENWOOD TENTEC

PLUS ALL MAJOR ANTENNA LINES

TELL US WHAT YOU WANTAND WHAT YOU HAVE TO TRADE . ..

WE'LL DO THE REST.

Write or phone Bill Slep (704) 524·7519

Elec tron icDistributo rs

Bullet Electronics Corp. P.O. BOll: 401144E Garland., TX. 7S040 (114) 17.·3SS3

THE PRESIDENT SAYS: "HOGWASH!!"

13.6v @ 20A MODIFICATIONav Cl\anl""il a _ p_ on I". _d II'IIt Troputp""..- Supply * ,Qdo II . ,.v (ad)...,abl.) a1 up 10m . P..-~ IOf IMal2 meI..-l_ amp' W. ""'Hlf:9I>V "ell .,,,,,"",'''''''' .nd n---,. p.ar1. " 061I1U1~ po<" "'o.",cl_ ..I" not o0l<I .... :JO <loy.. . "anly.

QUALITY DOUBLE SIDED GLASS BOARD

After taking one look at the TRIPUT POWER SUPPLY our engineer declared th at theunits were worth several hundred dollars each. He pointed out the engineering, h igh qualityconstruct ion and state-of-the-art integrated design in support of his posit ion . The Presidentof BEC more pragmatically pointed out the already fu ll warehouse and the two trailer truckloads of power supplies wa it ing in the parking lot, and set the price to move them QUICKLY!We have a large quantity , but the supply won't last long. The only th ing we ask is please readthe ordering rules.

+1 2v @ 7A; +SV @ 10A; · 12v@ SA• UNIT IS COMPLETEL Y ASSEM BLEDI• Fused primary and DC sections• HUGE SHIELDED TRANSFORMER• 2'll, Load & Line Regulation• Low Ripple « l00mvl• Snort Circuli Protection• Overvoltage Protecucn on atl tneee

Outputs• 25A Bridge Recllf ler• Over 60.000 mI d 01 Ililers• Hlgl'l Eff'Clency Swltcl'llnll Regulator

reduces healsink area• scne-oancs and service guide Included• Thermal Shutdown• stens LEO's (3)

Plus Freight

21 Ibs.6x5'/.x 12

---62.50REGULATOR ASSEMBLY

(part o f unit) COMPLETE UNIT(as you rec e ive it)

ORDERS SHIPPED WITHIN CONTINENTAL U.S. ONLVtORDERING RULES

1. Mail check or MO for $62.50 + $5.00 for shipping or phone (214) 278-3553to charge VISA/MC or COO order. (UPS COO only, add 52.50 COO fee)

2. 'texas residents include 5% sales tax.3. Orders for this unit will be shipped within 48 HOURS or we pay the freight'

(weekends or holid ays excluded]4. ONE TIME OFFERI LIMIT TWO (2) SUPPLIES PER CUSTOMER.

1l>t CT'<~O i.,h< moot , .".,ile, f...lur. pad ed .""nler I •• ilable '0< Ie..1tI... $300.00' Ad<i.nct<! d..iJtl r...ture. include: th,~ •• I..,..ble " ' e lim..,nine on...tl. ..~ ind icllOl" and I uniq~ di.p1.~ hold f\I""tion ,.h ich holds til<dl.p1.~ed count ofttr~ input li...... il .......,.e<t Also. • IOmH . TCXO "meNw is IlKd .,hi<:b enabkuasy •• ", bea. cahbr._ ch«b api..., WWV,

()pbonaI1y. "" in........ ""ad bione.,p«k. ...' omaI " ....~ iftpuIand MOCt<>_ .. hip .tability crystal ....... time~ ~ ••ail_ 1l>t CT-90.ptrf~ you . ... _ <IIIi

9 DIGITS 600 MHz $129 95SPEC IFICATIONS; WIREDRanI<" 20 H. I0 6(X) MH.Sen,ili,i')' Le.. ,b.n 10 MV to 1'0 MHz

Less than '0 MV 10 '00 MH zRelOlut lOtt 0.1 H.(lO MH.......)

' .0 H. (6O M Hz rln,!;c)10,0 H. (600 M H• ..",.,9 0>J1" 0 ..·• LEDSWodard-IOOOO mH.. 1.0 _ ~<C.

~ MOCt<> _ ... """"O,. _»-«I~C

S-IS VAC -.:BOma

u=n ... ~_ , _ _ " ,. .,£1 0(' .'-' ........- , ~- ' ..... , ~..._ .""-<- ".."'" __0--- ....._--- ".,

7 DIGITS 525 MHzSPECIFICATIONS;

12.95

$99,95PRICES;CT-70 wirtd, I ".,.,. ........*"I)'

CI·'O Ki~ 9Odaypa.u ",",.

~"AC-I AC odlp!t.BP·I Nil:od poo<k'" ACodapc ...fc.........

$99~IREDTho CT·'O b~oJ<, tI>t pr i<e blm• • on lib q~llil Y r'.quen<y counle'~

Ot' luoe r..,~~, ,,,,,b u \hn,. f~q ...ncy .an..' · •.., b ",i,b~ I mplifiClhof\.

dual ...Iectobl. Jlte lime.. IIId Jll. Ictivi.y illdioc:llion ....... 1'ne1'u~"'.MlI"'"P, The _ freq...ncy ro lIIb1et you 10 accU.II.1y ......u~ ..&nail

frnmllOd... llI.... V HF .,llI I.O """""'""Y . lha(, .00lll'-'! The CT·'70 i.............. I<> aD )'OU' ........te ...-. ill the field, lib or b.... ohock

20 H. 1O H5 MHzU " llwl50 MV 10 150 MH .u lSlhon ISO MV 10500 MH.1,0 H. (5 MH. <anJr)10.0 H. (50 MH. <an,e)100 ,0 Hz (SOO MHz ......1, ",,, lO 04 '· LED1.0 ppm TCXO 2O----4O'C12 VAC '" 2SO rna

Ron• • 'Se n"livil)"

"..."" .~ ~ ,.-- .. 7 DIGITS 500 MHz $79 95

WIREDPRICES;MINI·loo ...irN., I y•••.........nlyAC·Z Ac odop.e, for M INI' 00Bp·Z Noc:od poo<k oM ACodop.." choTp-r

3.95

12.95

H • .-e· ' • b.ndy. •ener. 1 I'U'P"O. coun"" (h.l provid., mool <ounl.rfuroc:lJOn, II on unl>< b•••bl. 1".... The MIN I-loo donn' , hove tI>t full

fi"eq... ncy . an,. or inpul i pedanc. qUl.lili• • found in hi price uniu, bullOr basil: SF "'Pl ol emmu.. il ca,,' l be belt ACC'IIrol ute....n..

can be lI'lIde from I MH. oil tI>t "'"y lIPlO5oo MH• .,llIuoel\eo' i""i'ylhn>upoon ,e. oM ........ ple timeI 101 )'OU resol ........

_""'" Add IbcId poo< k0fIl>"" oM .... MIN I· 100 mllln ideol oddI........ _ I<d bon for ~ ;"' I"fielcf' I't'equtncy cl>Kb oM repoin.

S PECI FICATIO N S:Ron..,: I MH. 10500 MH.SeMih..,ly: U N lhon 2' MVRnoluliolt 100 H. tt loor pr.)

1.0 KH. ( fill ple)

1 ciI".... 0.• " LED2.0 ppm 2O-4O"C5 VOC '" 200 ....

DIGITAL MULTIMETER $99 ~IRED

299~

119.9'1495

5 1 ~ 9, 9~

10 M"JOIImI, DOAC vollo0.1' buie OC vollo

• 'C' ceUi

01"" lO 2.0 A""" , I'UIJ"I01 ohm. 10 W 104" ........... 6 .......

PR ICES;CT·50 wi~ I ye...........'YCT·50 K i~ 90 doy pl.'".............y&A· I . ~~... odopco1" kll&A· I .-....doM~ .............mood l oomd COPY" _ ...he....ticl

S PEC IF ICATIO N S:DOAC ""Ito: lOOuV 10 I KV. 5 ,_,DOAC~=...........'''''~""""'"A"""r-ocy"-

$159~IRED

Tile DM· 700 " fI ..... plOI...lORol "l~,hl ~ f""'1",m&n<c or • h. ,~""' ''' p. i<...F.o'u."" l..d uJr, 2b Jlff"'",l , on..,. and 5 N"<1IOtlO. • 11 . ...n.-d In •C'O<fV_ l. . ... 10 ..... foo-m.l . 1.4 ar. ",.p.ved "" . 1. ,... 3<,;d>,;ol. \o! loch UP '~I h ~ d..a..... pIoc.......... . "'....... oc:p<>lu ,Ook ond ov lo.d prot""""" "" 10 1250 ...,l.."" 011, _ ".,.,.t.p«><>I> ThcOM·700 "" ~.

,... hb.: ~ . ",aced ARS l<h «10'_ n l. lo-l 1."" ... ankleoI aJ,J ltlOR '0 .... <hop199'

2.95

79 95395

SPECIFICATIONS;

Ron,.. 20 H. 10600 MH. TIle CT-'O i, ......til.l.b bencb cou nre' UIol",ill me..ure uplO6oo MH.Sellliti.;ty U N d.... 2S m' 10 ISO MH. williS dJliI precllior\ And. "",,"i.. be.. f..'ura i,the R""",~ Freq uency

Le. Uloo 150 mv 10600 MH. Adaj:ur, ...bioc:b ........... CT.50 inoo I ",ptll.-.o.doul fu ony tecei~.r, TIleRnolutiollr 1,0 H. (60 MH. r ,.1

10 ,0 H. (600 MH 1 ~. i,eall ly I'f'OVIftlIMd /'or."y 1'0«,"'" oM. Ilmple ..,.." . ",_l<> tIwS <II".. 04- LED rece",d. VFO 1I 001"'lltl t'eQl"red JorUK Addl... tIw 1'O«,,,,,,odopler .. 1IO2,0 ppm 2O-40'C y lun... .... _ .._ " tIw C T-50. .... ~. c... be 0DrI .........1Iy110 VAC or 12 VDC llCbed OIl or g/[ The CT· SO• • ~!hal c... ""'Ol"k dou~dut)'

8 DIGITS 600 MHz

PR IU S;DMJOO-.d, I_.......,.O M- 700 Kil 90 day pan.---AC· 1. AC odopt<xBp· J . Noc:od pICk + AC~rI~bI,.,..,.

Mp ,I. Probe kJ.

AUDIO SCALER ACCESSORI ES COUNTE R PREAMP

Fo. m."ulI"~ " 1, ......k . i. n. l. Imm 10 ro 1.0Cl0MHI, Sm.1I , it po.,,, ..J I>y plu~ ".n••'>rm... ·' nd uJ ..J,

• FII' 2S db pill• BNC COIUleCtOI1• G re.. for onil'li... RF wi'" pick· up loop

5:W , 9~ Kil S4. 9~ Wired1495

.. 5 7 .9~

15.951'-9512.95

J.95

T. lu copic ...bip """" BNC 1'1... . .. . • •.....H,. h ""pod.""" pI<>be. Ii ' k>odi".. . . . , .Lo... p... probe. for .udi" m."u,em.,," , , ... , .D ire", prol>o. ••n....1purpooe u.... .,, 'Ti~ boil for CT 70. 90. MIN I·I OO .Color bum c. hbrolion 'l c.hb••l•• count.r

......... cok>r TV . i _ .

For blgh ••",Iull"" .udlo m...ucem..nl>. m~luph e'

UP in fi" . qu.""y.• G'.ll rOf p L I""• •• Multiplie. by 10 Of 100• O.ol H. ceoolu'o<>I't

5299' K"

film5ey eleclmnic'5. inc. ""'" E32575 Baird Rd. Penf ie ld . NY 14526 ... 62

PHO:-.;E ORDERSCAl l 716-586--3~SO

!!...1t_~I.) \.<00,.'"' ''' 9"O'G_'" _ ' 0 "G ...... - - ,.-, ~ ~- ...~l". O ~ O_ . ,_~ .. , ' O 0 _ '. <OO G"'"U O _ " ' O _ ",0 "" ,,"""" 0,,"' .

73 Magaz ine • November, 1982 147

FACI! 4~SS SERIAL PACE PRINTER

Th~ Fa c ie 4555 alphanume r ical se rial printe r Is c~plete. Equipped wit h RS2J 2C In t er f ace ,prin ting .echanism, cont rol elec t ron ics , dr i ve e l ec t ron ics , powe r supp ly an d char ac t e r gen e rator. The adapta tion elect ronics can be modified In fou r ve r8 1ons : Bl t -pa ra l le l da t a transfer .CCIT! (Ell. . RS232C) for b i t -se rial da ta t r ansf er and the cu r rent l oop (TTY) inter face also f orb t t serial da ta tran sf er. The Fac H 4555 prin ts on o r d ina ry pa per and 18 ad jus tab le f or diffe r ..n t paper wl dthll and fOr1lla ts . 9. S" pa pe r width wit h 66 U ne s pe r pa ge o r DIN 1.4 with 10

lin l's pe r page .

2.541U11l1l1l0" BOch/llne1.55mm/0.06" l32ch/llneECMA-6 7-bit c ode d char. lIet63 Cha r . va r ious nat IonalversIons.Sprocke t feed.Fe..d mec hanhm

Char. Cod,'Char . Se t

SPECI F ICATIONS

Char. epee ingup to 60ch. s.I nc r emen t a l.80 alt. 132.7 X 5 d o t mat r l ~.

2.7mm/ I /8"I . 3_/0 . OS" 132ch/llne2. 1_/0.083" 8Och/llne

I' r i n t IIpeedPrln t l nll modeMax, , of chI l in eMatrixCha r. Si ze He i ghtCha r. She Width

THESE US ITS _~RE PL~LED OUT OF SERV IC E IN GOOD WORKING CONDITION . _~ CHECK EACH L~IT ON ARADiO SHACK tRS-80 COLOR COMPUTER.

•Pr In ter with Ilnecord, box o fpaper, Int er-connect cable f o rTRS-80 COLOR COMP UTER.

S149.99

PRI NTER ONLY $129 .99

G~~EVA CALCULATOR WATCH

This at t ractive watch has the following modes:No~l Time Setting,Calendar Setting .Dally Alarm Time Setting .W..ekly Alarm Tim.. Setting .Chronograph ,Caltulator.

Featured In Black Plas t ic $24 .99 or Featu red In Stalnl..s s St e e l $2 9 .99

SILICON DIODES FEED THRU SOLDER RF CAPACTO RS

MR751 100vdc 6Amps lO/S5.00 100/$38.00 470pf +-20);MR510 1000vdc lAmps 10/$3 .75 100/ S24 . 00HEPI70 1000vd c 2Amps 20/$2.00 100 / $ l S. 00 5/$1.00 o r 100 / $1 5. 00 0 '1103209 100vdc ISAlOp8 $2.00 10 / $ 15.00 1000 / S I00 . 00BYX211200 200vdc 25Amps $2 .00 10 / $ 15.00IN2lJ8A 600vdc 60A.mps $5 .00 10 / 540.00 l OOOpf / . OOlu f +- 10%DS85-04C 400vdc 80A.mps 510.00 10/ $80 .0011'13269 _de 160AaIps $15.00 10/SI20.00 4/$1 .00 o r 100/$20.00 0 '27SZ4 1 300vdc 250Aaps $20.00 10/5175.00 1000/ $1 50 . 007-S7~ 300vdc 400Am.ps $30.00 10/$HO.00RCo-I5 15KVDC 2_. $3.00 10 / $20.00SMFR20K 20KVDC 2Oma. $4 .00 10/ 530.00

E PROKS

1104148 signa l 30/51.00 100/ $3.002708 1024xl 52.00 ..aeh

FAIRCHILD 41 16 16K DYNAM IC 'W" 2 0Ons . Pa r t I 16K]) 2716 2048~8 S4.00 eaeh

25 For $25 . 00 o r 100 Fo r S90 . 00 or 1000 For $750.0027L32/2 5L32 $10.00 each

HE_'LETT PACKARD MICROWAVE DIOOES

IN5711 (5082- 2800) Scho t tky Ba r r i er Diodes 5 1.00 or 10 ' 0' s 8. SOIN5712 (5082 -2810) " " .,

5 1.50 o r 10 '0' $1 0 . 00lN6263 esca-iocn " " " 5 .75 o r 10 '0' s 5.005082-2835 " " " $ 1.50 o r 10 '0' 510 . 005082-2805 Quad Matehed " " " 55 .00 or I. fo, 540.00per s e t

Toll Free Number800-528-0180 ~GIl z electroavci(For order. only) - '-...:

PRICES SUBJECT TO CHANGE WITHOUT NOTICE


RECALL PHONE ME~RY TELEPHOSE \l ITH 24 SL'MBER AUTO DIALER AROS ALPRA RAPID BOSDING GLeE

The Reca ll Phone Tel ephone e.ploys the latest . ta te of artc~unications t echnol ogy. It i s a comb ina t ion telephoneand aut o..tic dia ler t hat uaes premiua-quality, solls-s tatecircuity t o assu re h i gh- re l iab i l i t y performance i n pe r sonalor bus Iness a pplications. $49. 99

Supe r Glue ICE- 486 high s t rengthrapid bonding adhes lve.AlphaCyanoac r y lat e . Se t - TIme 20 to 40sec . , 0 . 7£1. 0%. ( 20g... )

$2 . 00

THOl'CH roSE PAD MlTSUHl UHF /VHF VARACTOR TUS ER KODEL l1\'EIA

This pad con ta i ns all the electronics t oproduce a t anda r d touch-tone t one •• Sewwith data .

•I,•

Perfect f or those unscrambler projec ts.Sew with da ta.

$9 . 99 or 10/$89. 99 $19. 99 or 10/5149. 99

INTEGRATED CIRCUITS I t o 10 llup

~ 13 72P

MC 1358PMC 1350PMC13 30AIPMC 13 lOPMC1496PLMS6SNLM380N I4LMI889NNE564NNI': S61N

Co lor TV Video Modula t or Ci rcu i t.IF Amp.,Limiter ,FM De t ec tor ,Audio Driver ,E l ect ron ic Attenuator.I F Amplif i erLow Level Video De t ec t orFH Stereo Demodulato rBalanced Modu l a t or / Demodul a t orPhas e Locked Loop2Wat t Aud i o Powe r AmplI fierTV Vi deo Modul a t orPha se Locked LoopPhase Locked Loop

5 4 . 425.00I. 50I. 504 .291. 502. 50l. 565.00

10. 0010.00

$2.954.001.251. 153.301. 252.001.254.008 .008.00

FE~~T I ELECTRON ICS AM RADIO RECEIVER HODEL ~~41 4 ISTERGRATED CI RCU IT .Feature. :

1.2 t o 1.6 volt opera t ing range.,Leaa than O. Sma cur r en t consump t ion . l SOKHz t o 3~ z

Frequency range. , Eas y t o a . ae.ble.no alignment nec essary. Effective and variable AGe action. ,Will drive an ea r phone direct . Excellent aud io qua lity . ,Typ i ca l power ga i n o f 72dB. ,TO- 18

a clta e . With data. $2. 99 or 10 Fo r $24. 99

SI CAD RECKARGEABLE BATTERIES VHF DUPLEXERS

Gates Rechargeable Battery Pa cka

SUB C Pack o f 10 2 . 5Amp/ Hr ,

PRICE 574.99

Toll Free Number800-52lHllllO(For order. only)

PRICES SUBJECT TO CHANG E WITH OUT NOTICE

ThIs dup lexer was made for RF Ha rr i. Mobi l e Phones.These duplexers can be us ed in any mob i le phon eaystem ,along with haVing the capabi l ities t o bemodified for UH F use . Dimens ions sre 3 3/5"Lx 4 2/5"WX 1 1/10"0 . App. weight is 18oz./ 11b.2o z .

SI 1. 99S15. 99

$10.00

are FactoryS5.00

--

12vdc at 2.5Amp/Hr.12vdc a t SAalp/ Hr.

AA Ba tte ry Pack of 6 TheaeNew.


RF TRANSISTORS, MICROWAVE DIODESPART PRICE PART PRICE PART PRICE152 199 $ 7.50 2N60B3 $ 13 .25 CA26 12 ( TRW) $ 25 .00132200 7.50 2~6084 1S. 00 CA2674 ( TRW) 25 .002N1 561 25 .00 2N6094 t M9622 11. 00 CA288 1- 1(TRW) 25.00IN 1562 25.00 ZN6095 1:-19623 12 .00 CM IDI (TRW) 25 .002N2857 1. 55 2N6096 IM9624 15.50 CA420 1 (TRW) 25 .002N2857J AN 2.55 2Nb097 17. 25 CA4600 ( TRW) 25 .002N2 876 11. 00 2N6136 2 1.85 CD I889 20 .002N2947 18 . 3S 2:-.; 6 166 40 .25 C02545 20.002N2948 15 . 50 2N 620 1 50 .00 CMDS14AB 20 . 002N2949 3.90 2N64 59 18 . 00 04959 10. 002N29S0 4.60 2N660J 12 . 00 Dll987M 20 .002N )3 75 8.00 2N6680 80.00 D51470 10 .002N 3SS3 1. 57 2SC756A 7 . 50 D550 6 10. 00ZN 3632 13 . 80 25C781 2.80 DS827A!'1 20.002N 3818 5.00 25CI018 1. 00 DMD6022 30. 002N3866 1. 30 25C104 2 12 .00 DHS-2A- 250 40 . 00l N3 924 3. 35 25C10 70 2 .50 HEP76 4 .952N39 27 17. 75 25C 1239 2 .50 HEP53002 11. 302N 39 50 25 .00 25C125 1 12 .00 HEP5 300 3 30 .002N4072 1. 80 25C 1306 2 . 90 HEPS3005 10 .002S4 127 2 1. 00 2SC1307 5 .50 HEPS 3006 19.902N4427 1. 30 2SC 1760 1. 50 HEPS3007 25 .002N4428 1. 85 2SC 1970 2 .50 HEPs30 10 11 .342N49 57 3.45 2SC2 166 5.50 HTEF2204 H.P . 112. 002N4958 2 .90 8B1087 (M.A.) 25 .00 5082-0112 H.P . 14 .202N4959 2 .30 A5D-12 20.00 5082-0253 H.P . 105 .002N5090 13 . 90 A28 3B 5.00 5082-0320 H. P. 58 .002N5108 4.00 ALD4200N (A\'A..~TEK) 395 .00 5082-0386 H.P. POR2N5 109 1. 70 AM I 2 3 97.35 5082-040 1 H. P. POR2N 5160 3.45 AM688 100.00 5082-0438 H. P . POR2N5 177 2 1.62 BB1058 . 52 5082-1028 H.P . POR2N5 179 I. 00 BD4/ 4JFBD4 (G .E .) ID. OO 5082-27 11 H.P. 23 . 152N558 3 4 .00 BFQ85 1. 50 5082 -3080 H.P . 2.002N 5589 8.65 BFR90 J. 30 5082-3 188 H.P . I. 002N 5590 10. 35 BFR9 1 1. 65 5082- 6459 H. P . POR2N 5591 13.80 BFW92 1. 50 5082-8 323 H.P. POR2N 56 35 10 .9 5 BFX89 I. 00 3582 6E H.P. POR2N 563 7 15. 50 BFY90 I. 00 3583 1E H.P . 29 .992N 564 1 9 . 20 BGY5 4 25.00 35853E H.P . 7 1. SO2N5642 10. 95 BGY55 25. 00 35854E H.P . 75.002N56 43 15. 50 BGY74 25 .00 HP A0241 H. P . 75 . 602N 56 45 13. 80 BGY75 25 .00 HXTR3 101 H.P . 7.002N 5646 20 . 70 BL I 61 10.00 HXTR3102 H.P . 8.752N569 1 18 .00 BLX67 11. 00 HXTR610 1/2N66 17 H. P . 55 . 002N5764 27 .00 BLY568CF 25 .00 IIXTR6104 H. P . 68 .002N5836 5 .45 BLY 87 13.00 HXTR6105 H.P . 3 1.002N5842 8 .00 BLY8S 14.00 HXTR6106 H.P . H .OO2N5849 20.00 8LY89 15 . 00 QSCHI995 H.P . POR2N5913 3 . 25 8LY90 20.00 J02000 TRW 10. 002N5922 10 . 00 8 LY351 10 . 00 J02001 TRW 2 5. 002N5923 25 .00 C4005 20 .00 J04045 TRW 25 .002N594 1 23 .00 CA402 (TRW) 25.00 K3A 10.002N59 42 40.00 CA405 (TRW) 25 .00 MA450A 10. 002~594 4 9 . 20 CA6 1lB (TRW) 25 .00 MA4 148 7 POR2N 594 5 11 . 50 CA2 100 (TRW) 25 . 00 !".A.41 765 POR2N 5946 19 . 00 CA2 11 3 (TRW) 25 . 00 MA4 3589 POR2N6080 9.20 CA22 00 ( TRW) 2 5 . 00 MA.436 36 POR2N6081 10 . 35 CA22 13 (TRW) 25.00 MA47044 POR2N6082 11 . 50 CA2 4 18 (TRW) 25. 00 MA.4 76 51 25 . 50

Toll Free Number PRICES SUBJECT TO CHANGE WITHOUT NOTICE

~~ electroJUCI800-528-0180(For orders only)


GaAs, TUNNEL DIODES, ETC.PARTMA4 7100MA47202MA47771MA47852MA49558MB402 1MEDlOl1100513MHWll71MHWl182M\iW4 171NHW4 172MHW4342MLPI02MMlSOOMr-U550MM l552MM lSS3MM16 14MM2608MM3375AMM4429MM8000MMB006M0277LMo283LM03757MP IQ2MPN3202MPN3401MPN34 12MPSU3 1MRA2023-1.5 TRWMRF2 12/208MRF223MRF224MRF237MRF238MRF243MRF245MRF247MRF304MRF315MRF420MRF42 1MRF422MRF427MRF428MRF450/AMRF453/AMRF454/AMRF45S!AMRF45BMRF463MRF 472MRF475MRF477MRFS02

PRI CE$ 3.05

30.80PORPORPORPOR

1. 00POR

42 . 5048 . 6049. 355 1. 9068 . 7525 .0032 .32

POR50 . 0050. 0010. 005.00

11 . SO10 .001. 152 .30

PORPORPORPOR

10.00. 52

1. 001. 01

42.5016. 1013.2515.50

3. 1512 .6525 .0034 .5034. 5043 . 4523.0020 .0036.8041.4016. 1046 .0013. 8017. 2519. 9016 . 0019 .9025 .00

1. 002 .90

11 . 501. 04

PARTMRFS03MRFS04MRFS09MRFS l lMRFb05MRF629MRF644MRF816MR F823MRF901MRF8004MS261FMT 4150 Fair .MT5126 Fair.MT5481 Fair .MT5482 Fai r.MT5483 Fair.MT5596 Fair .MTS764 Fair .MT8762 Fa i r .MV I09MV1401MV 1624MV1805MV1808MV18 17BMV1863BMV1864AMV1864BMV 1864DMVI868DMV2101MV2111MV2 115MV220 1MV2203MV2209MV22 15MWA I IOM\o,'A 120MWA130MHA21 0MWA220MWA230MWA310MWA320MWA330NEC57835ON382PPT515-20-3PRT8637PSCQ2- 160PT3190pn194PT3195PT3537PT4166EPT4176D

PRICE$ 6.00

7.005.008 .65

20 .003.47

23 .0015. 0020 .00

3.002 . 10

PORPORPORPORPORPORPORPORPOR

.778. 751. 42

15 .0010.0010.0010. 0010.0010. 0010.0010.00

. 90

. 901. 55

. 53

. 5 32 .002 .007.457.808.257.808.258.658.258.659 .505.305.00

PORPORPORPORPORPORPORPORPOR

PARTPT 4186BPT4209PT4209CPT4566PT4570PT4571PT457 lAPT4577PT4590PT4612PT4 628PT4640PT4642PT5632PT5749PT6612PT6626PT6709PT6720PT8510PT8524PT8609PT8633PT8639PT8659PT8679PT8708PT8709PT8727PT8731PT87 42PT8787PT9790PT3 1962PT31963PT3 1983PTX6680RAY-340081402814028240290RFI IO5CA35225CA35235DI0655543TP IOl4TP I028TRW-3UT0504 Avan tekUT051 1 AvantekV15V33BVIOOBVAB80 1ECVAB804ECVAS21AN 20

P RICE$ POR

PORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPORPOR

41.70PORPORPORPOR

24.99PORPORPORPOR

25 .00PORPORPORPORPORPORPOR

70.007:5 .00

4. 004. 004 . 00

25 .0025 .0025 . 00

Toll Free Number800-528-0180(For orders only)



ElectroniC Sp~cia l ty Co. /Raven ElectronicsPart , 2S~28 Pa r t' SU-O l26Vdc Type S Con nec t o r . DC to 1 GH ~ .

FSN 5985- 556-9683 $4 9 .00

AmphenolPart # 316-10102-8115Vllc Type IlNC DC t o 3 cue ,

FXRPart n 300-111 82120Vac Type BNC DC t o 4 GHz.FSN 5985-543- 1225

'"P,....t # 300- 11 173120Vac Type BNC SameFSN 598 5- 54 3- 1850

$29 .99 $ 39 . 99 $39 . 99

••• •

I

BNC To Banan" P lug Coa x Cab l e RG- 58 36 inch o r ~~C t o ~ Coax Cable RG- 58 36 In ch .

S7 . 99 or 2 for $ 13. 99 o r 10 Fo r S50 .00 $8.99 o r 2 For $ 15 . 9 9 o r 10 For $60 .00

SOLID STATE RELAYS

1'108 Kadel ECTIDB72

PRICE EACH $5.00

5vdc turn on l20vac con tac t a t 7a.-ps o r 20amps on a10"x lO" x .1 24 alull l null . Heat sink withsilicon g r ease .

Dig h l g . Inc . l10del ECS-21 5

PRI CE EACH $7 .50

Cr i ga by /Ba r t on Model C8 7400

PR ICE EACH $7 . 50

5vdc turn on

5vdc turn on

240vac con t ac t 14alllps or10"x lO"x . 124 alUlllinulIl.sili c on gre,~s" .

2 40vac contact at 15amps10"x 10"x . 124 aluminum .silicon grpase.

40amps On aH('atsink with

or 40amps on IIHe a t s i n k with

NOTE: *** Items may be subst ituted with other brands o r equivalent mod e l numbers . ***

electroruc.li

Toll Fr•• Numb.r8OG-528·0180(For ord.,. only)



"MIXERS"WATKINS JOHN SON WJ-M6 Double Sa 1anced Mixer

LO and RF 0.2 to 300MHz IF DC to 3DOMH z $21. 00Conversi on l oss (SSB) 6.5dB Max. I t o 50MH z

B.5dB Max. .2 to 300MH z WITH DATA SHEETNoise Figure (SSB) same as above

8.5dB Max. 50 to 30DMH zConve rsion Compression .3dB Typ .

NEC (N IPPON ELECTRIC CO. LTD . NE57835/2SC2 150 Microwave Trans is torNF Mi n F=2GHz dB 2.4 Typ. MAG F=2GHz dB 12 Typ . $5. 30

F=3GHz dB 3.4 Typ. F=3GHz dB g Typ.F=4GHz dB 4.3 Typ . r=4GHz dB 6.5 Typ .

Ft Gain Bandwidth Product at Vce=8v. Ic=IOma . GHz 4 Mi n. 6 Typ.Vcbo 25v Vceo I Iv Vebo 3v Ic 50ma . Pt . 250mw

UNELCO RF Pocer and Linear Al!plifier CapacitorsThese are the farrous capaci tors used by all the RF PeMer and Linear Amplifiermanufacturers . and des cribed in the RF Delta Book .

Spf IOpf 18pf 30pf 43pf lOOpf 20Qpf 1 to lOpes . $1. 00 eaS. lpf 12pf 22pf 32pf Slpf llOpf 220pf 11 to SOpcs . s . 90 ea6.8pf l3pf 2Spf 33pf 60pf 120pf 470pf SI up pes . s . 80 ea7pf 14pf 27pf 34pf 800f l30pf SQOpf8. 2pf ISpf 27 .Spf 40pf 82pf l 40pf 1000pf

NIPPON ELE CTRI C COMPAN Y TUNNEL DIODES $7. 50MODEL IS2199 IS2200Peak Pt. Current rna. Ip sm tn. IOTyp . l lmax , 9mi n. IDTyp . Ilmax .Vall ey Pt. Cur rent rna. Iv I. 2Typ . 1. 5max . I .2Typ. 1. 5max .Peak Pt . Voltage my . Vp 95Typ. 120max . 75Typ. 90max .Projected Peak Pt . Voltage my. Vpp Vf=Ip 480min . 550Typ . 630max. 440m; n . 520Typ . 600max.Series Res . Ohms rS 2 .5Typ . 4max. 2Ty p. 3max.Terminal Cap . pf. Ct I. ?Typ . 2max. 5Ty p. 8max .Valley Pt . Voltage my. VV 370Typ. 350Typ.

FAIRCHILD I DUMONT Osc il loscope Probes Model 4290BIn put Impedan ce 10 meg.• Input Capa city 6.5 t o 12pf .• Div is ion Ra ti on (Vol t s/ Di v Fa ctor)10:1. Cable Length 4Ft. • Frequency Range Over lOOMHz .These Probes will work on all Tektroni x. Hewlet t Packard, and ot her Osc i l los copes .

PRICE $4 5. 00

MOTOROLA RF DATA BOOK

List all Motorola RF Tran s i stors / RF Power Ampl ifi ers, Varact or Diodes and much muchmore.

PRI CE $7.50

Toll Free Number~lOJl?: electroJUCI

800-528-0180(For orders only)



"SOCKETS AND CHIMNEYS"EIHAC TUBE SOCKETS &~D CHIMNEYS

SKllOSK300ASK400SK406SK416SK500SK600SK602SK606SK607SK610SK620SK626SK630SK636BSK640SK646SK700SK711ASK740SK770SK800ASKB06SKBWSK900SK906SK 1420SK1490

SocketSocket For 4CX5000A, R,J , 4CX IO, 000D , 4CXI5,000A,JSocket For 4- 125A,250A, 400A,400C ,4PRI25A ,4 00A ,4 -500A ,5-500AChimney For 4-250A,4 00A ,400C ,4 PR400AChimney For 3- 400ZSocket For 4-1000A/4PR1000A/BSocket For 4CX250B ,BC,FG, R,4CX 350A,F,FJSocket For 4CX250B,BC ,FG ,R,4CX350A ,F ,FJChimney For 4CX250B,BC,FG ,R ,4C X350A ,F ,FJSocket For 4CX600J,JASocket Fo r 4CX600J ,JASocket For 4CX600J,JAChimney For 4CX600J ,JASocket For 4CX600J ,JAChimney For 4CX600J ,JASocket For 4CX600J ,JAChimney For 4CX600J ,JASocket For 4CX300A,Y ,4CXI25C,FSocket For 4CX300A ,Y,4CXI25C ,FSocket For 4CX300A ,Y,4CX I25C.FSocket For 4CX300A ,Y ,4CX J25C,FSocket For 4CXIOOOA ,4CXI500BChimney For 4CXIOOOA ,4 CX1500BSocket For 4CX1000A,4CX 1500BSocket For 4X500AChimney For 4X500ASocke t For 5CX3000ASocket For 4CV8000A

SPaR$520.00260.00

74.0036.00

390. 0051.0073.00II . 0060.0060.0066.0010.0066.0034 .0036.0071. 00

225.00225.0086.0086.00

225 .0040.00

225.00300.00

57 .00650 .00585.00

JOHNSO~ TUBE SOCKETS ~D CHIMNEYS

124- lI1/SK606122-0275-001124-0113-00124-116/SK630A124-115-2/sK620A

Chimney For 4C X250B ,BC,FG ,R, 4CX350A ,F , FJSocket For 3-500Z , 4-125A, 250A , 400A, 4-500A, 5-500ACapacitor RingSocket For 4CX250B ,BC ,FG,R, /4CX350A,F,FJSocket For 4CX250B, BC,FG,R, /4CX350A ,F ,FJ813 Tube Socket

S 10.00(pair)15 .00

15.0055.0055.0020.00

------------ --------------------------------_. _---_.------- --------_.... TUBE CAPS (Plate)

CHIP CAPACITORS HR1, 4 $11.00.Spf IOpf lOOpf* 430pf HR2,3,

" 713. 00

Ip f 12pf llOpf 470pf HR5 , 8 14.001.ipf lSp f 120pf SIOpf HR9 17.001.4pf lSpf 130pf 560pf HRlO 20.001.Spf 20pf l SOpf 620pfl.Spf 22pf l 60pf 6S0pf2.2pf 24pf lSOpf 820pf2.7 pf 27pf 200pf 1000pf/ .OOlu f *3.3 pf 33pf 220pf* 1800pf I. 0018uf3. opf 39pf 240pf 2700pf/ .0027uf3.9pf 47pf 270pf 10, OOOpf I .Olu f4.7pf 51pf 300pf lZ,OOOpf1.01Zuf5.5pf 55pf 330pf 15 ,000pfI .015uf6.8pf 68pf 360pf 18 ,000pf! . 018uf8 .2pf S2pf 390pf

PRICES: 1 to 10 - . 990: 101 to 1000 . 60!! • IS A SPECIAL PRICE : 10 f or $7 . 50l l t o 50 - . 900: 1001 & UP .35,. 100 f or $65. 0051 to 100 - .800: 1000 for $350.00

WATKI NS JOH NSON WJ - V907: Vol t age Co~trolled Mi crowave Oscil lator $110.00

Frequency r ange 3.6 to 4.2GH z, Power o~put , Min . 10dBm t ypical , 8dBm Guar anteed .Spurious out put suppression Hanrcni c (nfo) , min . 20d8 t ypical , I n-Band Non-Harmon ic , min.60dS typical , Resid ual FM, pk to pk , Max. 5KH Z, pusht nq f actor, Max. 8KHz/ V, Pulli ng f i gure(1.5 :1 VSWR ), Max. 60MHz , Tuning vol t age r ange +1 to +15vol t s , Tuni ng cur r ent , Max . -O. l mA ,mod ulation sensit i vity r ange , Max. 120 to 30MHz/ V. Input capac itance , Max. lOOpf , Osci ll a t orBi as +15 +-0. 05 vol t s @ 55mA, Ma x.

Toll Free Number800-528-0180 &JW <OJI z electr0'Ucfl(For orders only) - \...;


154 73 Magazine . Novembe r, 1982

TUBESTYPE

2E262K282X I000A3B223B28/866A3- 50023-100023CXIOOOA/82833CX1500A7/8873X2500A33CX3000A74-65A/BI654- 125A/ 4D2 14-250A/5D224-400A/84324-40OC/67754-1000A/8 1664B324E27A/5-125B4CS2S0R4X150A!70344X1500/70354Xls0G/ 81724X2S0B4CX250B/72034CX250F/G/86214CX2 50K/82454CX2 50R17580W4CX300A/81674CX350A/832I4CX3S0F/J /89044XSOOA4CX600J/88094CW800F4CXI OOOA/ 81 684CX1500B/86604CXSOOOA/8 1704CXlOOOOD/81714CX15000A/82814PR60A4PR60B/82524PR400A/81885CX ls00A

PRI CE

$ 5.69100 . 00300.00

19. 757.50

102. 00400 .00428 .00533.00200.00490.00

45 .0058 .0075.0090 .0095.00

300.0022 .00

155.00146. 0030.0040 .00

100 . 0030.0045.0055.00

100.0069.00

140.0083.0095 .00

282 .00607 .00625. 00340.00397.00932 .00990.00

1260.00100 .00175.00192. 00569 .00

TYPE

KT88DX362DX4 15572B!T160L592/3-200A3807811811A8 12A813829B832A4624466246655675 /A57215768583658375861 !EC555876A5881/6L6W58935894/A5894 /B594660806083 /AX99096098/6AK66115/A6 1466 146A6146B!8298A6146W61566159616162916293636065246550

PR ICE

$ 20 .0050.0050.0049 .00

144 .007.50

10.0015.0035.0050 .0038.0028 .00

3 10.0080 .00

585.0025 .00

200.0085 .00

100 .00100.00110.0025 .00

6.0045 .0050 .0060.00

258 .0010.0089 .0014.00

110 .007.007.508.50

14 . 0066.0015.00

233 .00125.00

12 .005.00

53.0010.00

TYPE

6562/ 6974A68326883/8032A/855268976907A69397094711772117289!3CX I00A573607377740876507695784378547868789480728117A8 12 18 12 282368295/PLl7284628505A8533W8560/A8560AS86088637864386478737/5894B887388748875887789088930/65128950

PRICE

$ 50. 0022 .00

7.0011 0. 00

75.0015 .00

125.0017. 0060.0034 .0011 . 0067. 00

4. 00250 .00

8 .0058.0083.00

5 .0012. 0065 .00

130 .0060 .00

100 .0030 .00

506.00100.00

73.5092 .0065.0090.0034 .0038.00

100. 00123. 0060. 00

260. 00260 .00260.00533.00

12. 0071. 0012. 00

6.006.006.006.006.006.006.006.00

6JM66JN66JS6B6KG6/EL5056KM66KN66LF66LQ6 (GEl

6.005.006.006.006.006.006.006.00

6BK4C60Q56FW56GE5BeJ56H556JB5/6HE56JB6A

6LQ 6 (Sy l vania) 7. 506LU8 6 .006LX6 6.006ME6 6.0012BY7A 4 .0012JB6A 6.006KD6 6.006JT6A 6.006KD6 6 .00

NOTICE ALL PRI CE S ARE SUBJE CT TO CHANGE WITHOUT NOTI CE 11 !1 1!1!!III !l! !! ! ! ! !I !IIII! I! !l l ! ! ! I ! !TUBES MAY EITHER BE NEW OR SURPLUS COND ITION I!!!!! ! !! ! ! ! ! ! ! ! ! ! !!! !!! ! ! ! !!!I ! II! ! ! ! ! !! !! !!I! ! !

Toll Free Number800-528-0180(For orders only)


73 Magazine . November, 1982 155

"TVRO BOARD LIST"10 MHZ I F BOARD: This ~l [cult provides about 43dB ga in wi t h 50 ohm i npu t and output impedance.It 1s designed Co drive the Demodulator. The on-board bypass filter can be tuned to bandwi d t hs between 20 snd 35 MHz wi th a pa s sband ripple of less than ~ dB. Hybr i d Ie's are usedfor the gain stages .

SISGLE AUDIO BOARD : This circuit [eCOVers the audio signals from the 6.8 MHz frequency. TheMiller 9051 coils are tuned to peas the 6.BMHz subc" ••!er and the 9052 coil tunes for recoveryof t he a ud i o.

DUAL AUDIO BOARD: Duplicate of the sing le audio but also covers the 6.2 range.

DC CONTROL BOARD' No d esc r i p tion .

COMPLETE KI T WITH DUAL AUDIO $923 .23COMPLETE KIT WITH SINGLE AUDIO 880.77

LESS lOX ON ALL COMPLETE KIT ORDERS

BOARDS Al'O PARTS MAY BE PURCHASED SEpERATELYAT THE PRICF.S LlSTED ABOVE.

ALL PRICES ARE SUBJECT TO CHANGE WI THOUTNOTICE I II! !l l ! ! ! I II!! II I ! ! ! Il l ! ! ! ll l l l ! !

DUAL AUDI O BOARD PRICE EACII

Printed Circuit Board , 25 .00z 3pf am 1.00a Upf sm 1. 00a 50pf alii 1.00a 68pf Sill l. 00, 911'£ .. 1.00; .00lmfd ."• .Olmfd ."z .041mfd .", .41mfd 25vM ."a Imfd 10v dc .", 4.7mfd 3Svdc .", 470mfd 25vdc I. 29z 220K 1/4" ."z 150K 1/4" .", 6 .811: 1/4" .", 3 .311: 1/4" ."z 2 .2K 1/4" .", IK 1/4w ."a 10 ohm 1/4w .", 50K pots 1.00, 5K pot 1.002 CA3065 2 . 16, LM 380 I. 56, 181 2 Voltage Reg . 1.11, 2N2222 .>0, MU l e r 9051 5 . 992 Mil ler 90 52 5 .99

TOT AL KiT PRICE 91 . 62

--------------------------------------DC CONTROL BOARD

Prin ted Circuit Board 15.00, 4 70mfd 25vdc 1. 29z 4. 1..fd 2 5vd c .", I meg 1/ 4w ."

3 10K 1/4"I 3 . 3K 1/4"3 2 .211: 1/4"I I l< 1/ 4w2 5K 10 t urn t rimpot4 10l< 10 tu r n trbpotI 10K 10 t u r n wi t h dialI 18 15 Vol t age Reg .I LMJ24I 5 pole ro ta ry R,,:ItchI SPOT ""itch1 DPDT R"l ch1 D-Ima IIleter1 18 t<> 24vdc at 1 amp

pmoer supply

TOTAL II: IT PUCE

DEMODULATOR BOARD

Prinred Circuit Board1 Imfd 35vdc\3 . Ol mf d 50vdc diReI 410mfd 25vdc2 IOOmf d 16vdc2 Zlmfd 35vdc3 4.7rnfd 35vdc1 4300pf s mI 330pf Sm1 100pf SOl

1 9 1pf S m2 3pf smI 2 t o 8pf ceramic trimmer1 100uh choke1 4 .7uhchoh1 2.7uh chnke

."."."."1. 001. 00

10 . 00I • I 72.502.50I. 001.005.00

24 .99

74 .27

PRI CE EACH

$ 40 .00

."."I. 29. 60

."."2 .00l. 001.001.001.001.00I. 501.501. 50

~ lOOK 1/4"1 51 ohm 1/4...1 21K 1/4..5 10K 114\01I 8 . 2K 1/4",2 4 .7K 1/4..I 2.2K 1/4",I 1.2K 1/4..3 lK 1/4",3 560 ohm 1/4",1 410 ohm 1/4..1 390 ohm 1/4>1I 300 ohm 1/4"I 270 ohm 1/4wI 150 ohm 1/4wI 41 ohm 1/4"I 10K potI NES92/LM733NI ~E564

I W~A 120 (Motoro la)1 7812 Vo l t age Reg.I 78 15 Voltage Reg.3 2 ~2222

2 I!04f)81 11 1' 5082-28001 5 to 1 volt Zenner

TOTAL KIT PRICE

."."."."."."."."."."."."."."."."1.002.505.007.801. 171.11

.>0.>0

2.201. 00

92.25

TVRO BOARD DESCRIPTION AND PARTS LIST

DUAL CONVERS ION BOARD: This board provides conversion from the 3.7-4 .2 band first to 900 MHz"here gain and bandpass filtering are provided an d , second, to 70 MH z. The board containsboth local oscillators , one fixed and the other variable , snd the second mixer. Constructionis g reatly aimplified by the use of Hybrid Ie amplifiers for t he gain sta~es.

DE1'I0DUU.TOR BOARD : This circuit takes the /0 Mllz center f requency satellite TV sign.,i in the10 to 200 millivolt range , detects them using a phase l oc k loop , de~elllphasizes and filters theresult to produce standard NTSC video . Other outputs include the audio subcarrie r , a DC voltageproportional to rhe strength of t he 70 MH, signal, and APC voltage centered at about 2 volts DC.

~- ---------- --- --- -------- - ~ - - - -- - - -~ ~- ~

SINGLE AUDIU BOARD

TOTAL lOT PRICE

Printed CircuIt Board1 3pf Sm1 12p f SolI 50pf ~m

I 68pf Sfn

2 91pf Sm3 .00 1rnfd3 . Ol mf d

."."."."I. 29

."."."."."."."1.001 .002. 161.561.11

. >05.995.99

55 . 16

1 .047mfd! . 4 7m f dI Imfd IOvdc3 4.7mfd 35vdcI 470mfd 25vdcI 2201': 1/4"I 150K 1/4wI 6 .811: 1/4...I 3.311: 1/4"I 2.21': 1/4"3 IK 1/4wI 10 ohm 1/4wI ';DK potI ';K potI CA306';/1'ICl15RPI LM380I 1812 Voltage Reg .3 2N22222 ~Hller 9051I Miller 9052

TOTAL KIT PRICE-----------------------------------------

PRICE EACH

$ 15.001.001.001.001.00>' 00

."."

7.80

."."1.001.001.001.00

."4.991. I 7

86 .45

M\.IAI20. Ol mfd ';Ovdc4.1mfd 35vdcIOpf sm22pf smIS pf sm33pf smno ohm 1/4"J.W. Mi ller 4500-47815 Voltage Reg.

,ra,,,,a;,

25. 00

5 .99

."8.65I • I 7

150 . 00156.25

."125.0025 .00

5. 00

572.64

PRICE EACH

$ 25.001.00

."."

70 MHZ IF BOARD

DUAL CONVERSION BOARD

Printed Circuit Board6 47pf chip caps2 4. 7mfd 35vdc2 .0 lmfd 50vdc disc cap4 1.5t08pfpiston

trillllller cap2 470 ohm 1/4...2 MIlAn O (Motorola)I 1815 Voltage Reg.I VT08090I VT082402 1N40051 DBM500/ 1100 (Vari l)I MLP102 (Engleman)8 SMA Ma l e Connector

TOTAL KI T PRICE

Pr in t ed Circui t Board

Toll Free NumberSQO-S28-01811(For ordera only) PRICES SUBJECT TO CHANGE WITHOUT NOTICE

156 73 MagaZine • November,1982

"CHIPS"

GENERAL ELECTRIC CO. GUNN DIODE MODEL Y·2H17F,eq. Gap IGHZj 12 10 18. Oul pu l (Mln_l l oomW. Duty 1"1.,CWoTyp _B,u IVdc1 80. Type_Ope, (MAdcI 55O. Ma_ tn-es.(mAdc) 1000, 1.4.,_ B,as fVdCl 100 $39.99

VARIAN QALLIUM ARSENIDE GUNN DIODES MODEL VSX·9201S5F'eQ eo"erage 8 10 12 " GHz. Output 1104' '1 ,) 100mW. a.asVOllilge (Ma_I U vdc . a.as CU fl enllmAdc) OperatmQ 550 Typ750 Ma l ., ThrtlsMld 850 Tup_1000 Mal SJ9.99

VARI·L CD. Inc. MODEL SS·A) AM MODULATORF.eQ Ailnge 60 10 15OMC. tnsernon Loss D dB Nom ina l.S,gna l PO.t Imp 500nms Ncrmnar, S,gn al Po.I AF Powe'+ l Od Bm MiIX . MOdulat,on PorI BW DC to 1KHZ, Modula t,onPOll Bias lma Nom,nai $24.99

FAIRCHILD VHF AND UHF PRESCA-LER CHIPSJ50MC Presealer divide by 10111350MC Prese_ ler d iv ide by 5J6650MC Presca ler d iv ide by 10111

6500MC Prese_ ler d 'v ,de by 5J6UHF Presceter 1SOMe Olype FlIp F loplGHz Counter D,vide by"(Reg ular once $7500)High Speed Dual ~" Input NOINOA GateP,esen.Dle High Speed Decadel8ma,yCounter used w,l l'I tee l1C90191 or t ne95H9OI91 Pre scale' can d 'v,de by 100,(SIgne t'cs)Th,' crill' IS the same as a Motoro laMC40Z414J24 Dua l TTL Voltage ConlrofM1,1111", b ratorTrus ee.e rstee same as a Mol o,o laMCAOUIA3U sease F,eQuency Detector.

FREOUENCY SOURCES. INC MODEL M$-UXMICROWAVE SIGIIlAL SOURCEMS·7AX_ Mecna n,call y Tunable Frequenc y Ranqe IMHz) 10630 1011230 110 63 to 11 230 Hzl Mm,mum Oulpul Powe' lmWI 10. Overa llMull ,pller Ral 'o 108. Inlernal CrySl al osc.natcr Freq uency Ranqe(MHZ! 98 A 10 11)4 O. Max,mum Inpul CurrenlImAI400

The s,gna l socece are des,gned 10' apphcal ,ons wnere tUQI'l Slablll l yand lOw no,se are 01pr,me concern tnese sources uhl,ze l unaamen·lal Irans,Sfo r csc.narors w,l h h,gh a coa l ,al cevu.es. 101i0wed byb,oadbano stab le slep reco"ery cncce mulliphe's Th,s des,gnallows s,ngle screw mE:chan,cal adjustment o l l requency over sIan·e..'d communlCal,OnSbilnds BroaOband Sa mp llnQ c,rCU ' ISare usedto phase l oc ~ tee escuurcr to a n,gh SIa bd,l y re te reece whIch maybe e.tne- an Inle,nal sell·conlained crystal cscrnatot , e_ternalpflm.,r y SIanO."d 0' VHF syn l hes,ze. Th,s unique Iecnmque auowator op l,m,zat,on 01bOlh FM norse and long term stab,Io ty. L,st Puce's $1158 00 (THESE ARE NEW ) Our Prlce-S289.

HEWLETT PACKARD 1N57 12 MICROWAVE DIODEte.e d iode w,1I reorece me MB0 101, I N5711. 5082-2800.5082,2835 ect Th,s Will work hke a cnamp on au u-oseDown Converter projects 51 .50 or 101510.00

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• COR KITS With audio mixer and speakeramplifier. Only $29.95.

• CWID KITS 158 bits, field programmable,clean audio, Only $59.95.

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HIGH QUALITY FM MODULES FOR• REPEATERS, LINKS, TELEMETRY, ETC.

• Rl6 VHF FM RECEIVER for 10M, 8M,2M, 220, or commercial bands. Fantast icsafectlvityootions, Kits from $84.9510$1 09.95

• R450 UHF FM RECEIVER for 38(}S20 MHzbands. Kits in selectivity options from $94.95

• R11 0 VHF AM RECEIVER Kit for vhf aircraftband or ham bands. Only $84.95.

•

VHF & UHF RECEIVER

PREAMPS. Low noise.VHF Kits from 27 to 300 M Hz. UHFKits from 3ooto 650 MHz. BroadbandKits: 20-650 MHz. Prices start at$ 14.95 (VHF) and $18.95 (UHF). Allpreamps and converters have no isefigure 2dB or less.

VHF & UHF RECEIVING CONVERTERS

20 Models cover every practical rl and if range tolisten 10 SSB, FM, ATV, etc. on 8M, 2M, 220, 440, and110 etrcrat t ba nd. Even convert weather down to 2M!Kits from $39.95 and wired units.

• • """• .~ - "",--. ,.~. -

"For SSB, CW, ATV, FM, etc. Available for 8M, 2M,220, 440 with many IF input ranges. Converter boardkit only at $79.95 (VHF) or $99.95 (UHF) or kitscomplete with PA and cabinet as shown.

VHF & UHF TRANSMITIING CONVERTERS

•

•

•

•

~i-z•..:ItZ:It

i-'"•

I

• COI"' p.ac t• O....",yCon~l! uCt lon

• 11....»10 11'

• ,I,Uo<d.b...• W'de R..~ 0 1

"'ccesso< ,\'s... . .. ,'..b...

p luI 13.oos hip ping

Reg.

,$3.49'>"

CALL FDA PRICE ~

AVAI LABILITY

I

ICO M IC2A, IC2AT

@i

..\c'tJ'- IC3AT (220 MHz)\"~ IC4AT (440 MHz)

BEAReAl 8C·l 00 "ANO·HELDPROGRAMMABLE SCANNER

• 8 Band, 16 Channel• Auto Scan ' ChannelLockout e " Now Take itWith You Anywhere !"

,

1(,

Ttle ,",v.nll On·GI.... OS lhe Ill'It IwO'w.y com,"un..::."on...nlenn. thll mount. on gl.U . nd" .nsm,'S .nd ,eeei... s Itl' augtl the gllu Eo" emely low II$ WR .. ac r>ea'e<l Dy .dlu~l'ng

spec'"lunlng " ug on malch ,ng ""lwor k InS'delhe .eh,c 'e Cl n De eaSily 'emo.ed fo' carwashes w" hO ul spec ,al lools

plu' 12.00. hlpplng

we s tcc e Communi e .ll oll •Speci.lIst s S532 and 55·32Meecccers lor mos t a lly mobile 01hand ·he ld apoucanoos ,"ctud·ing me very popul a r leomH.ndh. ld s .

...

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OU IC~ , easy mount, nll Tu ....' 2, 6, 10.I!>, :2'0 a nd ..0 meter ,", mlle u' bandS.pluS SW BC Dands in l ome ranges , 360wailS SSBIC W. n'h " whip extends to57". 14· mount. Inc lu" e a !> base·loadingco ile. We 'gM less lhan 2 lbe

,... ...e

" easy.talk'r' voxPORTABLE TRANSCEIVER ~

54995

~••.

, plu.S3.00I lIlpp ing

~

~ ~~ • Up to Y.z m ile FM Transmill ingi. • " Hands free" VOX operationt . Lig ht weight - less than 9 Oz.

Valuable aid lor Amateur U$9 in antenna instanencn. luning/pruning. I'e ld day, etc.,plus hundreds 01 applicat ions in homebcsmess. sports and recreation. Uses 9YOII battery (no t supplied.)

99 0094.50

126.95132 .00

plw> 'l ao.~,,,,,,n9

(co"n u S I

p1u. n oo' h'pp,nll

lCont>1 USAl,",ccepls any "e"1Olon of !he IC·2/1.. "pp''''s lIS o ulP<J f to . woo....D..nd rt ..mphl 'e' , and "el..ers25 waifS 10 you, mOllile anten,na Mob,'e la lk-Q ul pow e"

VoCom POWER POCKET

58995plu l 13 00I lIlp pl"1;

ICo"I" US I

POPU LAR HAMFEST SPECIALS!

~~J $-... ..' ;,.. , ~•• •

SUB·AUDIBLE TONEHEADQUARTERS

ENCODERS plus 12.0052995 s h,ppingl i t" (ConI'! USA only)

' 59"

FAM OUS " EAVESDROPPfR"SW RECEIVIN G ANTENNA

.(if) cQ I C>= €Ji) .' ~ ~@ c:::: C> o:=x ®.~ ....~ iCALL OR WRI TE. MASTER CARD, VISA, MONEY ORDERS, PERSON AL CHECKS TAK E 3 W EEKS /J ZTO CLEAR, ACCEPTED. INTERNATIO NAL OROERS WELCOME, PLEASE REQUEST PRO FORMA C'INVOICE. ILLINOIS RESIDENTS ADD 6% SALES TAX. 0MON. THRU W ED. 9:30-6:00, THU RS·FRI. 9:30·8:00. SAT. 9:30·3:00 a

i

5249 5 plll.S2.00.hlpplnll

F it s W ils o n Ma r1l II ,a nd Ma rk IV p lusvaesu FT·207. 500MAH, 11.7 V. Nickel·C admium.

ALEXANDER BP 4-W500 MAH NICAD

FIXED, PORTABLE And MOBILE ANTENNA VALUE FAVORITES!MORGAIN MULTI·BAND ANTENNAS B&W PORTABLE AVANTI THRU·GLASS ANTENNA

APARTMENT ANTENNA

AMECOPREAMPS ~ ,, ~- i

...GU OO • • . __ :....._t .. - .

ICoIon us. ....."

TO ORDER:

HOURS:STOP BY AND VISIT WHEN IN THE CHICAGOLAND AREA!!

Model PLf ·2 SS2 '~ <;

Mod. 1PLf·2E (2 40V~ 557.95Model PT·2 519.95Model PT ·2E 1240V) $84.95

8O-40HDIA 8()140 MI. baMs (691Add S ~ OO 15140HD/A 75140 M l f tMIO(\s 166)

1o. ''' 'PP'''11 15.1 0HO/A 7S/40i2Ol1~1 0 M l f (661tCoro n U S A I eO.10HOIA 8OI4()12Oi1~1 0 Ml f (691

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$2'.95$29.95$29.95$29.95

2575 Baird Rd.Penfie ld, NY 14526716-586-3950

Call Your Phonf' OrdE" in TodayTEAMS' Sa\lSl<lClion gua,anl""" Of moneyrefunded C.O.D. add $2.00. Monimum ",de<$6.00. Ofoers UnOer$10,OO addSl .50. AddS ' I,101' posH_ge, Insurance, Il;ondl ''''II . OYe<S8&Sadd IS"Io N y 'e~nI5 add 7'10 la.

e.--EOCII

CLOCK KITS ~y ...... _ t• •_. _ 1M.. ~..... 0... 7.C11)1l Sold ... 0... .~.. _ 01 .... """nd _. you"'_r'

Try yout hand al bUlld rng The finest looking cloc k on thema rket lis !>aton lm.s" a nodized aluminum case lOOkS qrea tanywl'l ere . Wh i le 51 . 4 H LED d,g't s p rovid e II hIghly reada bledisplay ThIS IS a complete k.t . no extras needed and II only'ak !!'S 1-:! ncors 'a assemble Your enoree 0 1 case colorsSIlwe r , gold blac k lspeclly)ClOCk k,t , 1:!/24 hOur. OG-5Clock w llh 10 min ' 0 " me , . 12124 nou r. DC-10A larm ClOCk. 12 hOu, only, DC-8tav DC ca. clock . OC-7

...... a "'1'8' _.~ __ ...... acc e 10 c:Q: ' ..""", .. a .....o ,,, ......,, ....

......... COo,,"""" _ ~ '0 C__ -.. _ yOu """ _ J ..._ ~

. ..."'_ .... -. 'S ,......... O'oPIa "9"'9'"'" ..,'~ '" "''9"_c....."'" 1"'01<><" - yOu '" a '"'9""''''-_ 0 ·..... 0 _, Com.. on.U"~ '-" a""" ' a' uo ~", " Ca" ''''''''''' . """ _ ~...,."

,aoo C"-' "' 'Ia<' or g_ cne '''''''',''''OC·"" ' 2 ' _' .n "OC·' .. .,.., • ...., , ", , ....

FOr Wifed and tested clocks add $10 00 ' A k It pnceSPECIFY 12 OR 2. HOUR FORMAT

Car Clocknoa U N-k.T . oNY ' -. c_ _ ,

SUper SlauItlA su~ ...ns" ' .... amp"t,e. " " IC" .. ,1I 1)fC . UP 'pln drOp It 1S Ieet' G<ealtor """'~onnc;I tIaI>y'lfO()tI'I or IS~al PU"l>OW amp"he< Full 2 w""5 0VIpu1 ~ on 6 t<:tl S von•. ...- s."SOI\m

-~C<:>mrW~ .~ 8111-9U K

l_Dacoda< i1... com~'" lone dlOCO- .§fd'" on a . ,ngl" PCooa.d F"alu' '''' 400·SOOO H Z ac:IJul la!>l",.nge ... 20 'u ' n PO' . 00.age '''9u ''. ' lOn S67 Ie Use'u' '0' ,ouc,,·Io n" I)U'" de'e.;. ,OfI FS" ",cCan "'0 tie use<! IS a l ,a D'" 'one"ncod.... Run. on S ' 0 12 ' 0 111Compl",,, k,' . TD· T S5 ., 5

Lad e_r 1(11A 1I,..a, a l1""' IOIlII''' ''e< ""'II:" . 1Ie<nalely11asr>e12 JU"'bO LEOsUse lor_~

Dullon. .. a , n ' " 11pol...... hgN. aroyIlW>g'Runs on 3 '0 l S WOIII~" .,,- BL- l

$2.lIS

We now have avaua bte a bunch o f goodies toogood to bypass Items are limi ted so Order rooav

PARTS WAREHOUSE

CPO-lRun. on :J..12 Vde , ..all ou, ' ''HZ OOCHl'OO" CFO... .. . m , "''''''0 Oscll"'", Comp llO,a . ', S2 fl

v__... ..:-Coo'I *"y Tv ,,,......., ••",f..",. 5_....... , .,.... "" 0 -6 R..... Oft !·,~y acc ~ ."'"""9".. 8ft! wM on"' eoon_• •" 110-' 11"

WhiSpe' Light Kit

An ,n ,e , e ll,ng k 'l. .",.11 "'ukeI>'(k. "'P .aund' .nd eOlwe .,.' ''e m TO "ghl The Ioudel IheIOund. '''e brtg" 'er I" e I,g htIn c lud es m,ke , con"o's up TO300 W. ' un. on 110 VAC

Complete k,r. WL-l$S ,95

11. IS11."

FM·2 k., 14 lIS

MINI KITS YOU HAVE SEEN THESE BEFORE NOWHERE ARE OLD FAVORITE AND NEW ONES TOO.

GREAT FOR THAT AFTERNOON HOBBY.

RAMSEYELECTRONIC'S

..... 62 Inc.

F....3 p(.,F"'-3 wo•..., ...... T",...,

FM W_S MlII.a .ClI

I> ..,pe' "'II~ pe<1or"'ance rl,l",'e·len m,. .. . ,1' l,an.... ,' s a 5'ablot"'lIn,,, up 10 :liOO Ta'ln .. ,'~ ..CIt9·'oone' aUll'" qua"'y DT _ani of " Ir.,, '11 '" '""'<:',1'1 "" .a 1(,1 '0'1(:'_ca... m,. ... on-ofl5" "C". an'""",Nil...., an<! SUPl"",",,,.<:1'''''5 Tn'5"',.... t,....., uM a.a.laD..

FMMINIMIKE

T'an.,."" UP ' 0 300' '0any H oi D'OIodeaSl .a·" '0 . u.... an y Iype 0 1m,." Runs on 3 ,o 9V Type FM·2

:" IS ackl"" ...ns,I.." "" 'a p<n"'pslage

FM· l . " U .fl

PARTS PARADE

M ad Billter Kit

p'Od uc.. lOUO ai' l'>atte ..ng a n<!att anr,OfI gen,nll .. , an h'" soundCan . upply up 10 15 "a1l. 0 '00"0"005 aucIoO ~""" on 6-15 VDC

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" t less case '''0' ava "a P~ 1OC· g $).$ 95

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Siran KItP,od uce. ... p... ,d .nd do..n",.,d..",I cha,aC'e " ..1C 0' a police."en SW pe"k aLJel'Ooulpu, ",nson 3--15 ' 0 115 , "leS 3-.5 oh",spea ke'COmplele kit. S "-4·3 52.IIS

$4 ." 5M B · 1 " ,,

u"'. ...... T_' . IIP' .... 'des ,,' .. PIS'C part. and PCl>O.a'd 'equ"eel '0p'o.-'da a . ou'ca0 1 P'*C """" "';''''ll and pul"general,on Ulal ~5 " .... ' 'C and,ncl udM I 'ange 0 1 PI'" ' 0 ' "'oilI."" ng nHd.

UT-5 !\.' n.n

S5U5$44.95

5 1.00Sl .00U .2551 2551 .25

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-- -..J ,~..--600 MHz

PRE SC ALER

Extend tee rang e 0 1 ve e rcou n ter to 600 MHz Wo 'k swith all counters t ess tnant 50 rnv sen srnvrtv sp ecuv •100,·100

Wifed , tested, 05-18K II. PS-1B

_ TO-92 H..., S-s'_,"_Br_ , ".To·no _ , s....o. I S••

-Sup"" •.,Co"'P~" ' ' 'ple ' egula'eel PO......&liPpi, poew"'"" .a"aP'" 610 " .OI'S a,200 ma anll -S a, 1 .. ...p E. ceo....., 0C>a<l

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octc Isoiato lS • 4N28 typeoete Rel lectou - Photo d IOde' LED

A" d IOPre l cali"M"ke h Igh ,e so l"" ,o n "U"'Om easu'm"n,s , g rea t fo. m USfc a l,nsl'ume nl lun"'g , r t.t c -es . etcMu ll,p l,e s e oe.c UP ,n f'eque nc y,se lectable .,0 o r . 100. g ..e s .0 1HZ resctcnco wllh 1 sec. g a lelo me ' H,g" sens" ,v" y o l:!S m • . 1meg mput 2 " n" b",l ...n t'lte"n gg"e$ g ,ea l perform.nce Ru n son 9V balle, \" 1111 C MOSPS -2 . IlP5·2 ",, " e"

30 Wall 2 m l r PW R AMP

SIm p le Class C p o wer am p features 8 tun es po wer gaIn 1 W In10, 8 OUI. 2 W In for 15 OUI. 4W in tor 30 out Mao output of 35 W.,nc' ed,ble value , eomplele Wllh all parts. less case and T-R relayPA-1. 30 W pwr amp kIt $22 .95TR-l . R F sensed T·R rela \, ktl 6 .95

"'RF·231 "an.'flor a, _ ,n PA_'a ·IO<lDlla,n 150 "'~z SI1 .fl

-- ...--....., _,-.... ,.00" __... " .

RF ac tuated rela \, senses RF11Wj and closes DPD T re lay ,

Fo r Rf sensed T-R .elayTR- 1 Ktl $6.9 5

71to'G 5, 2579"'G 51 .25723 5 "J09I< 5U I1805 S' OO

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......... to '.- a-, __ M-St.

St.!>O$5.00$500

O,UCf U "",0' ' • • " $' ." I" .<01' '5v ' .""' of " '"0".... ~,.

M,n, RG- IU eoa.10 ft. 101 S1 00

AC GuMa'Pan.. ' ,,"oun' ..,,~ l ..adS

4 "$1.00

...$ISO".

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Cry. lal.3 ~ 7 95.5 M" Zroooooo M"Z5 2_MOO "'''Z$ 1.• 0

51.00J /$l .oo

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Co.. ConftKlOIC " .SI'S mount

BNC type $1 .00

DC-DC e__ cer.1'I'I<C IF F ,Il'"'S _ "'PUt ""'" ,_ ~_ M,n. caram", fo".... 1 kHz.,_"""'uc.. ' S_ _ ~.... $ ' <IS BW . •~.ttz 1 ' .50 ..

Crya.... _ .........Srt>alll " d'a"'..... '~- " "coe ....'., m',a ean",,11'" S.7S

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Socka,.10/12 00Ult$2 00101$2.001112001112001152.00

25 AMP100V Brod ge$1.50 .aeh

M In i-BrIdg e SOV1 AMP

2 for $1 .00

IICgo10116rece72071>721'07' 07C53 1.5375 "'BIG'00'

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FERRITE BEAD S_ ____• '1.'1' .____ 1.'1' .

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8 P,n, . P,n16 P'"24 P,,,

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TRANSISTORS

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DEALER DIRECTORY PROPAGATION

NOVEMBER

J . H. Nelson4 Plymouth Dr.Whit ing NJ 08759

EASTERN UNITED STATES TO:

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PIF PIF FIG

New Yaesu FT·102 SeriesTransceiver of Championsl

The long--awafted new generation of Yaesu HF technology has arrlvedl ,jew research inImpnlved receiver filtering end spectrel purily Is brought to beer In the competltion-bredFT-l02. the HF iron_designed lor ectlve Ameteurs on todey's Intensely ecnve bends I

lIque C8SC11cMd Fillet'" System,FT·102 utilizes an advanced 8.2 MHz and 455 kHz If system, capable of:epting as many as three fitters in cascade. Oplionallilters of 2.9 kHz,1.aZ, 600 Hz. and 300 Hz may be combined with the two stock 2.9 kHz filters lor~rating flexibility you've never seen in an Hf transceiver before now!I New~ Front Endtiling huSky junction field-ettect transistors in a24 volt, high-eurrent design,fT·l02 front end features a Iow-distortion RF- preamplifier that may be by.

;sed via a front panel switch when not needed .Notch and Audio Peak Fitterlighly effective 455 kHz If Notch Alter provides superb rejection 01teteroes. carriers. and other annoying interference appearing within the IF passId. On CW, the Audio Peak Filler may be switched in during extremely tightt-up conditions tor post-detection signal enhancement."lable IF B.ndwldth whh IF ShiftI FT·102's double conversion receiver features vaesu's time-proven Variableldwidth System, which utilizes the cascaded IF filters to provide intermediateldwidths such as 2,1 kHz, 1.5 kHz. or BOO Hz simply by twisting a dial. The'table Bandwidth System is used in conjunction with the IF Shift control,ich allows the operator to center the IF passband frequency response withoutying the incoming signal pitch .

lde/NMiOW After Seilction;>endillll on the exact combinatiOn of optional lilters you choose, a variety oflelnarrow operating modes may be selected. For example. you may set upI kHz in SSBIWIDE. 1.8 kHz in SSBINARROW, then se1ecl 1.8 kHz tor CW/DE. and 600 Hz or 300 Hz for CW/NARROW. Or use the Variable Bandwidthset your SSB bandwidth . and use 600 Hz for CWIWIOE and 300 Hz for'/NARROWI No other manufacturer gives you so much t1uibility in selectinglr responses INbIe Pul.. Width Noi8e B.....brition noise, the " Woodpecker: ' and power tine noise are mOdem-day eneIS of effective Amateur operation. The FT-102 Noise Blanker offers imprOVednking action on today's man-made noise sources (though no blanker canninate all forms of band noise) for more solid copy under adverse conditions.w Distortion Audio/IF St.ge Design~ that dynamic range, stability, and AGe problems have been largely enmre!! thanks 10 Improved technology, Yaesu 's engineers have put particularmtion on maximizing intelligence recovel)' in the receiver. While elemental)'lr cascading schemes often degrade performance, the FT-102'5 unique blend:rystal and ceramic IF filters plus audio lone control provides very low phase!y, reduced passband ripple. and hence increased reaMll)' 01 information.

"'8VY Duty 111,..-Tube Final AmplifierThe FT·102 final amplifier uses three 61 46B tubes for more consistent poweroutput and improved reliability. Using up to 10 dB of RF negative feedback, theFT-102 transmitter third-order distortion products are typically 40 d8 down.giving you a studio quality output Signal.

DU8II Metering SystemAdopted from the new FT.(INE transceiver. the Dual Metering System providessimultaneous display of ALe 'IOltage on one meter along with meterillll of plate'IOltage. cathode current. reiative power output. or clippillll level on the other.This system greatly simplifies proper adjustment 01 the transmitter.

Microphone Ampllfter Tone COiiboiRecognizing the differences in voce characteristics of Amateur operators.Yaesu's engineers have incorporated an ingenious microphone amplifier tonecontrol circtl it. which allows you to tailor the treble and bass response of theFT-102 transmitter for best fidelity on your speech pattern.

RF Sp8llch ProceuorThe built-in RFSpeech Processor uses true RFclipping , for improved talkpowerunder difficun conditions. The clipping type speech processor provides cleaner,more effective "punch" for your signal than simpler circuits used in othertransmitters.VOX with Front P.... ControlsThe FT·102 standard package indudes VOX tor hands-tree operation. Both theVOXGain and VOXDelay controls are located on the front panel, for maximumoperator convenience.

IF Manhor CircuitFor easy adjustment of the RF Speech Processor or for recording both Sides of aconversation, an IF monitor circuit is provided in the transmiter sectcn. Whenthe optional AM/FM unit is installed, the IF monitor may be used for propersetting of the FM deviation and AM mic gain .WARC B8nds FKlory InmlledThe FT·102 is factory equipped for operation on all present and proposedAmateur bands, so you won't haveto worry about retrofitting capabilityon yourtransceiver. An extra AUX band position is available on the bandswitch forspecial applications.

Full Une Of Acceuor1aFor maximum operating f1eKibility, see your Authorized Dealer for details of theoomplete line of FT-102 accessories. Coming soon are the FV·102DMSynthesized VFO. SP-102 Speaker/Audio Filter. a full line of optional filters andmicrophones, all(lthe AM/FM Umt.

Price And Specmcanons Subject ToChange WithoutNotIceOr Obligation

YAESU ELECTRONICS CORP., 6851 Walthall Way, Paramoun~ CA 90723 • (213) 633·4007YAESU Eastern service Ctr., 9812 Prlnceton-Glendale Rd., Cincinnati, OH 45246 • (513) 874-3too 582

VBT, notch, IF shift, wide dynamic rangVarious IF filtcr optionsEilht'r a 5OO-Hz 1'11\-88 ('] or 270 liz(YK·8 8CN) CW filler nHW be insl.lllI"d inthe 8.83-MHz fi~t IF, arid a \ '("1")' sharp5 00- 11 ;0: IYG-455CI or 250-lIz IYG--155CN)CW filler is avntlable for th e ·155· kHz,,('('o nd IF.

o Morc flcxlbility with optional digital VFOVFO 2:10 operates In 20 liz sn-ps andIncludes five mcmonos. Also allows splitrrcqu-ucy operation, Bulll ·ln digilaldi splay" Covers about 100 kllz above- andbelow ea ch 500-kllz ba nd .

o Built-in RF specch proccssorFo r added a ud io punch and tncreasedla lk power in OX pucups.

o RlTtXITRe- t-etve-r Incrementa! tuning m lT I shiftsollly the recetver frequency. to tune instanons sli!-(htly o ff fn'qut'nt"y. 'transmuter mcrcmcntat rumng (XITI shifts onlytilt" transmnter frequency .

o S SB monitor circuitxtonnors IF stage w h ile transmnnna. tooerc rmtne audio q ua lily and e-ffect ofspeech p rocessor.

Mere information 011 the T S -830 S isavatlabte from all authortzed dealersof Trio-Kenwood Com mururauons1111 Wesl Wainu l S tree t. Co m pton,California 902 2 0.

Spt"Ci(i<-ulions and pn("(,>; r.. "",,b;er' 10 rhange u'ilholll nOl,("(" or obliqntion.

Variablc bandwidth tuning (VBT)Connnuousty varu-s the IF utter passbandwidth to n-duo- rnterrerence. VBT and IFshift can he courrottcd Independently foroptimum inH"r1l'rt'lw(' rejecuon in anvco n d tnou.

• IF notch filtcrTunable high Q ucuve crrcun in 455-kHzse-cond IF, for sharp. deep notchcharadt'rl!'>II( 's .

o IF shiftShift!'> IF pas.<;baml toward hight"r or lowerfrequetu-Ie-s {away from interferingsi~na lsJ whtle- IUIWd receiver- frequencyrematns um-hanjjed .

o 6146B final with RF NFBTwo 61-t6B's In the Ilnal amplifier provide220 W PEP ISS13ltI8 0 \\' DC (CW) inputo n all ba nds. HF nega uve feed back provides o ptimu m l~fD eharactertsucs forhigh-qu'llily transmission.

• Built-in digita l displaySt x-dtgn la~l" Ouore'>('t"n t tube d is p l,. y ,bac-ked up by an analo~ d ial. Readsactual receive and rransmn Irequencvo n all mode... a nd all bands. Display Hold10111 swtn-h .

• A djus ta b lc nolse -btanker reverB Uilt-i n tlo l'>(' b la nker elim inatespulse- rvpe (sul'h as I!-(Il il io nlnorse. Front pa nt'! t h resholdlevel control.

Matching accessories for fixed-station operation:o S I' -2:l0 ex ternal speaker 0 JlC-1O d igi ta l w o r ld d lWk

wuh sck-rtable a udio filters • YG·4 5 5 C (500- Hzl a nd• YFO 2 :~0 external di gital YG·455CN (25 0- Hz l C W

YFO with 2 0 -Hz steps. fillt ' rs fo r 455-k l lz IF!lve memones. d igi ta l dlspla.v • YK ·H8 C (50 0- Hz) and

• A 'r-z au anten na tuner / YK·8HCN (2 70-Hz) CWSWH and power mete r filter-s for fl.83 ·MHz IF

• MC·5 0 desk mtcrophcne 0 IIS ·5 and HS -4Othcr acccssorics not s hown: headphones• TL-922A linear ampltfler 0 MC-30S and ~C-35S

• SM·220 Station Monitor notse-canceumg hand• PC·I phone patch mn-mphones

~ 8305 FEATURES;

• 160-10 meters, including three newbandsCovers a ll Amateur ba nds lrom I.M 1029,7 ~lIil (LSD. USB. and C \ \1. i ndudin~

li lt' IWW 10 . 18. and 2 4- Mllz bands.Reretve-, wwv cn 10 ~HIJ: .

• Wide rec eiver dynamic range.Iuncnon f E T s (with optimum 1~1 I> r-ha recrensucs and low norse n~un' l i ll thebalanced mi xer. 'l MOS fET HF amplifieroperating at lo w reve t fo r unproveddynam ic range Ih igh arnpltfu-anon reve tno! needed because o f low noe-e Inmt xert. d ual resonator fo r each ha nd, a ndadvance-d overall reccrve r d l'i'OlJ.,(n re-sultin I'XCt"llt"1lt dynamtr- r ,mge .

Now most Amateurs c a n afford a hlgbperformance SSB/CW t ransceiver withevery conceivable operaUng feature builtIn for 160 through 10 meters (In c lu d in gthe three new bands). The TS-830Scombines a high dynamic range withvariable ban dwidth t u n ing (VBTl. IF s hift,and an IF notch filter, as well as verysharp filte rs in the 455-kHz sccond IF.Ita optional VFO-230 remote digital VFOprovldCIi five memories.

November 1982 $2.49 Yr

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Transcript of November 1982 $2.49 Yr