Radio Amateur 08-1985

Sw-7800 Schematic

Heathkit 7800

I've been a ham now for almost 25 years There's a let of enjoyment goiten from Talking to new and old fnends on the ham Dands However as with any other hobby, a person craves to branch out and expand his or her horizons In my case, J thought It was Lime to Iry shortwave listening again as I had when I first started out. Since all my old shortwave gear Is long gone, I needed something new to gel back into generai-coverage receiving while at the same lime noi spending a smaif fortune. Heath's...

Amp Solid State Relay

Ence frequencies which is applied to the programmable frequency divider, C4, via Q28 and Q29, programmed by leel switches to divide the relevant difference frequency from Q27 to provide a 10-kHz output which is applied to the phase comparator, IC5. Note, by the way, that the difference between the transmit and receive offset frequencies is 10.7 MHz, which is the required intermediate frequency. So far so good But now we have to backtrack a fittle There is a problem in that IC4 cannot precisely...

Instant ATV

W8CHK breaks through the mystique surrounding fast-scan television. You won't believe how easy it can be Broadly speaking, this aspect of television will remain untouched because it isabsoluteh illegal to be active in it without an appropriate license. Most readers, however, will know that A5 emission (video) is perfectly legal for any holder of a Technician-level or higher amateur license with privileges above 420 MHz. But of the large number of amateurs qualified for operating in these bands,...

Antenna Yha-44d

1985 Ham Radios

Close-up of tripod-socket installation. .See fexf for details. The 5000hm video-level pot (R1) must be shunted with a 100-0hm resistor. A 100-Ohm pot is preferred for this spot but is hard to find (Fig 1). An antenna can be pul together quite simply. First, a 6-1 2 * length of 22 rod is soldered to a BNC connector Next, this is stabilized Photo F, Panel layout. Ihe bezel (see text) shields the switches from accidental tripping. with an epoxy filler. Presto, a serviceable antenna This...

Dick Smith Electronics Uhf Wattmeter

Dick Smith Electronics Australia Kit

I'm gomg out on a limb and pred lt cl that one of me best things to happen to electronics in the US this year is the emergence ol Dick Smith Electronics. Incthe California-based arm of Dick Smith Elec-ironies Ply Ltd. ol Australia. Tnis unjque io pany offers a full line of electronic parts, kits, and pre wired assembles us-jng a marketing and advertising style that is sort of a cross between the old PoJy Pakg catalogs and Radio Shack. According to their sales literature, the company has been In...

Give A Hoot

As a rag chewer, I am continually appalled by the habits of contesters Day after Jay I use the 4t gt and 60-meter bands and take care of them as if they were my own. Then suddenly a contest ee end Bf nves and the bands are to wall wlih com esters who use the bands for con ests onty and often treat them unkindly I can understand the frenzied pace during a contest thai would prevent the avid users from keeping things tidy, but what about later The day following a contest is the most depressing....

Don Wallace

Trie DX community lost one ol i is pillars m late May. when, Don Wai lace W6AM passed away after a lifetime of OXing. Don's OX accomplishments are legend and include DXCC award No 1, membership in CO's DX Hall of Fame, and top of the Honor Ron for most of ih> j past 20 years. He was one ol the firs DXers to earn Worked All Continents, back when such was a considerable feaL For more than 40 years Don operated from one ot I ha bHSt-known DX locations in the world the DX ranch at Rancho Falos...

Vacation Special

Superior Drop-in replacements for original filters Band widths SSS 2 kHz. CW 500 or 250 Hz (recommended introductory prices , . 555.00 each Two for 100.00 hipping i u< j us. Ofi Air US & Canada p.o. Bo* 15944, Dept. s w. Pairn Beach, fl 33416 Telephone (305)683*9587 r& ji Fully Assembled I and Tested r& ji Fully Assembled I and Tested

Namiromcs inc

65-D MOUL ROAD HILTON NY 14468 Phone 716-392 B430 Hamtronics* ft * ngttMd tiadmnart R144 R220 FM RCVRS for 2M or 220 MHz. 0.15uV sens. 8 pole xiaJ filter & ceramic filter m i -f, helical resonator from end for exceptional selectivity. > 100 d B at 112 KHz, best available today. Flutter proof squelch AFC tracks drifting xmtrs Xtal oven avail. Kit only 138. R451 FM RCVR Same but for uhf. Tuned line front end, 0,3 uV sens. Kit only 136. R76 FM RCVR for 10M, 6M. 2M< or 220. As above, but w o...

Scope That Signal

Are you overmodulating Is your linear linear Find out with a station monitor you've built from scratch. Do you worry f do When I operated SSB, I always used to worry about whether my r g was adjusted properly to put out the best possible signal, My ngH like many transceivers today, use a linear Stage for the final amplifier regardless of the mode of operation, be it SSB or CW, and the oniy instrumentation provided is the ubiquitous panel meter. In addition, I had a direc tional couplerfor...

The Seiko Data

As amateur-radio operators, we nave a unique habit of exploiting the capabilities of a variety of electronic equipment. From modifying a surplus radio to converting a CB transceiver for Ten-meter use. we are constantly adapting and applying techno ogy to meet our needs. However, nol all equipment requires modification to be useful. A perfect example of this is the widespread use of microcomputers In I ho ham shack to handle the laborious task of log keeping, QSLmy. and other paperwork A ne...

The Armadillos Are Running Again

In Texas In 1983, the members of the Texas DX Society decided to try their hand at county hunting by activating all 254 Texas counties during the County Hunters CW contest. Fewer than 60 hams covered 262,000 square mites in less than 48 hours to accomplish the feat. In 1984, the club expanded the Armadillo Run, as it came to be called, to include the states of Arkansas, Louisiana, and Mississippi, Now the group has even bigger plans a national Armadillo Run That's right, they will attempt to...

Radio Transcription Discs Want

W7FIZ Bo 724-WG. Redmond WA 96073 0 2J BNB347 USCG licenses and 6-month endorsement required For sea-going employment. Excellent money and fringes for technically qualified person. Send resume and copies of licenses lo Box MH 2493, 8iG Sevehih Ave . New York MY 10019 BNB34Q CABl E CONVERTERS, Lowest price. Dealer inquiries accepted. Quantity discounts Free catalog PG Video Corp 61 Gatchell St D pl 73 Buf lt ak gt NY U21Z BNB349 ANTIQUE RADIOS, schematics tubes, and...

Transmit Converter

Why pay big Ducks for a multi mode rig for each banfi Can De linked wiih recelva convert pfsfor uansceHve.iWaltioutpui vhL I WaiiuM. No Need 1o Pay S30 to S125 for a GaAs FET Pteamp No Need 1o Pay S30 to S125 for a GaAs FET Pteamp Very Low Noise 07 dB VHF, 0.8 dB UHF High Gain 18 to 28 dB. Depending on Freq. Wide Dynamic Range tor Overload Resistance Latest Qua gate GaAs FET, Very Stable

Allmode Bipolar Amplifiers

Model 5123 (2 Meter Amplifier list S235 25 Witts i i 150+ vraiisflwr HI W ats m W watts out Model 5121 (2Meter HT AmpWier Let 1285 ModH A2-11.2 Mrn-r Mult purpose Amplifier) ., List 275 1(1 Walts j i 104 Witts CM* M-51 4 (154 Meter Amplifier 30 Waits m & WmisM M Walts in 80 Wait out sum Til 35 (7lu m Amplifier) 3 Wat is in 1 Watts nit I Walt to 40 Watts out

Lpl259 Connector

OG213 noncontaminaTing ii- sheild mii spec 36cfftr RG174 U mn sp 96 > S -elii 10cift. ftGTIU Shield, 7 ohm milft > ec 25c fi PG8U96 sn.etd mil sp c J29 95rt00 U. w 31 rtt RG6A U JOiir.i sh.efii 75 ohn 25e ft. RG58AU stranded mil spec 12eirt RG8X 95 Shield 14.95 1M it. or 17 ft. RG59AJ 70 copper braid 9c 1t. RG59U TOO- foil s eid TV tve- ________ lOerft. RGAU97 shield u ga < ju v Beidefra , 31& H. Oiji> RotofCatli & 18 ga. 36*m. Rorof C bieii can S-ift a t 22 ga t9cift. Ami'hertOl...

New North American Dx Record

On 1296 MHz may have been set by Ott Rebel W4WSR and Wes Atchison WA5TKU. Ott and fellow experimenter A Ward WB5LUA tried for nearly a year to bridge the 1073-mile gap between their stations and establish a new terrestrial 1296-MHz record. Not until June 3, 1985, did favorable conditions appear. In Ott's words, I commenced our sked at 0100 UTC and stood by. Al came back with such a signal that I thought it was a local trying to break in We immediately switched to SSB and exchanged 59 reports....

Eme In Czechoslovakia

In the fast ARPL EME contest stahon OKIKiR mjde 45 contacts altogether and by 36 multipliers gained 162,000 points In the 145-MHz band, the operators of the station used a 4 x 10 yagl antenna (accord log to PAGMS> and ihey had contacts with 0L80AT. SM2GGF K1WHS WAWXN 7. K& aftQ and YU3WV and thev heard 25 other European and North American stations. On 433 MHz they made contacts with JA6CZD, G4EZN. F1FHI, HB9G, YU1AW. DL9KR N4GJV WA1RWU, N 9 A B. WB5LJJAH F2TU. K2UYH, I5MSH WBGTEM. K06R...

Hitech Styling

What can you do with a pencil, a razor blade, a paper clip, and a hank of wire Why, build a radio, of course Penn Gower W1BC 459 Lowell Street Andover MA OlflTO Hams with TV1 problems often learn the hard way how poor metal connections can generate harmonics. Two conductors making partial contact, in gutters for example, can rectify and re-radiate as harmonics part of the signal from a nearby transmitter What few newer hams realize is that the same phenomenon was crucial to the operation of one...

High Power Surveillance Ir Scope

This Infra-lied seope was designed specifically for lonu r mtie surveillance use. The builtlint totally invisible, 50 watt halogen lamp IR source is coupled with a premium grade type e 03'J image converter tube, 265 mm fo -2 Jens, and I 6 power military spec,, color corrected eyepiece make this an ideal unit for viewing of clandestine activities < > r animals. The scope is capable of detection at more than 300 feet, recognition at 300 Feel and positive facial identification at I 50 feet. It...

Harmonic Free

Avoid an FCC pink slip by measuring second-harmonic power Like many others who like to keep their hands busy and who like the smell of solder, I also pass my time by building simple receivers1 and QRP transmitters I am always worried that the output filter of the QRP transmitter is not working weli and that I put out too much second-harmonic power It is no use listening to the second harmonic on the station receiver it always sounds strong and no real idea can be formed of the strength in...

Digit Sequence Decoder

* LE ' ' it r J * . * rrcr relayF ynLIEt l' Ciii-M . il ni an off Cu< ton i maures h i * i 1 dt - 1 rifp jns fin VDC (35rrraJ 1 Mrjkie lient pr ite i c+ll ur bu , pea. - i J*iP it tci turn or audio or Round dn aF.irm y Mnrriecr it- y .ir t a i hpng outputs .-if.itH 1 i d and V '-ii accBpif ,1 ur gend check M il. iiddress iirld G4 pnce md des shipping USA Rendue

Best Buy On Kenwood

Quantities limited, shipping extra Check, Cash, orC& 0< H.L. Heaster, Inc. 203 Buckhannon Pike Clarksburg, W. Va. 26301 W. Va. Toll-Free 1-800-352-3177 Naiion Wide Toii Free 1-800-824 7088 Florida (904) 673-4066 tor return call 73 does not keep subscription records on the premises, therefore calling us only adds time and doesn't solve the problem. Please send a description of the problem and your most recent address iabel to

Cs Vac To Cat Header

Tor scope is straightforward As shown in Photo Ar the unit was assembled in two separate enclosures, one tor the CRT and its associated circuitry of Fig, 3, and a second one tor the remamderof the circuitry. The two enclosures were connected by a heavily-shielded cable. In this manner, the CRT was kept far away from the stray fields of the power transformers which otherwise could have blurred the oscilloscope trace. Point-to-point wiring was used in the CRT enclosure, while perfboard...

Dm Digital Multimeter

QuaJily ni a rv iu st phcc f H ufea liicijde rE diltaroni fanw nr s lunt 'i ops* d n inch LE D duptay * mal , r ace ' * i - X a . i r LID gutter 41 a ftfea tnrv flh fr- - Status * ) b - cy 'u KflKfi pf F du ufeciaa i tenme * gtte jci vdty na *t r 50m 1 T50 MHi ypiCS1 Wl vity reqi ftCy rmrge 1 ppiti liCc.LjriCV Si 1 Q95 *.Jf il cludes I I AC Adapter CT-7 kit , S99.95 BP-J rutad ( ftrh . . ------ - - 1-95 UmurpauBd qtmUiy il an ibwtfii p+ict fw Ram< t* r o& titia-se ope comparas 10 entier*...

Pr Counter Preamp

Tfio .Ji' Hot measuring rriin signal horn H) to 1 0W> MHz iial n ab oarn * 0NI-. Cijnrea& ri * -it forshii . g RF * -dea1 r,r. range Ol yo.ip prflSBfd OunlrH 10 I OMKj 2 agepream * -.idew H3 Ciritr> '. rtspiiy.iy 25m M t i5 MHJ 9KC COnr*ctOfl anv i ar tOuntfr r,r. range Ol yo.ip prflSBfd OunlrH 10 I OMKj 2 agepream * -.idew H3 Ciritr> '. rtspiiy.iy 25m M t i5 MHJ 9KC COnr*ctOfl anv i ar tOuntfr -- * r 4i a AA p i

Mhz Portable Logicscope

The Log cScope- M 136 from Jensen Tods Inc combines many of the features and capabilities of sophisticated logn analyzers and oscilloscopes t is Hflht-weight .25 lbs , compact 9 25 , IS , V75 , and lasl 10 MH T The instrument was designed for servicing digital eiec ironic circuits and equipment and Is es pecially well-suited lor Held work LogtcScope jepiaces the conventional CRT with an array of 400 LEDs whicfl per 77te LogtcScope 136 from Jensen Tools 77te LogtcScope 136 from Jensen Tools mits...

Denver Co Jul

The Amateur Radio Motorcycle Club Rocky Mountain Roundup III will be held July 30 through August l i985r some' where west oi Denver CO The e*act Ioc l tlon wNI be named later. Riding radio operators check the ARMG Net on Thursday nights, 0300 UTC. 7237.5 kHz. Send a busi ness-size SASE o Gary McDuifie AGtfN, Rt Box 46J Bayard NE 69334. and ask for nel information The Austin Amateur Hadio Club and the Austin Repeater Association, In conjunction with Ihe Texas VHF FM Sociely, wjII sponsor the...

Introductory Price

Charges tn 15 minutes Constant Current Automatic Voltage cut-off Battery doesn't heat-up 12v-14vdc input. Charge from any point in without developing memory Proven in daily use Please add S3 for Shipping and Mm idling. Call for COD Information. Florida Residents Pletiuo Add 5 Sales Tttx To All Order*, P.O. Box 17015 Plantation, Florida 33318 K9HDQ. ct nr Techmcal Insttluie. 9511 Angora Court. Indianapolis IN 46266 317> 67S3640. The Sar> Jose State University ARC will operate WGYL to comm...

Brookfielo Zoo

The Chicago Suburban Radio Association win operate special-event station W96T from the Brookfield Zoo. Brookfield 'IL, to celebrate ihe zoo'4 annual Country Fair Days Operation will be On August iDtl and 11th, from 1500 UTC to 2300 L C, using Ihe phone frequencies of 146 55. 14,250, and 7.250 MHz. A special SL card featuring ihe zoo s Clydesdale drall horse team will be sent lo stations thai send their QSL card and a *10 SASE to N9BAT Special Event, PO Box 86, Lyons IL 60534. The Panhandle...

Upstate Ny License Classes

Amateur-radio training programs for all license classes are scheduled to start In Ihe fall In lour New York areas Potsdam-Canton, Fort Covingion-Hogansburg, Ma lone, and Saranac Lake Lake Placid, For a complete schedule, contact the Program Coordinator, AI Lapier W1CSF, D.Uane Road, Mountain View NY 12963 (5l& -4& 3-0046, The Wireless Insiitute ol Ausiralia, the world's First radio society win celebrate its 75th anniversary during 1965 The WIA 75 Award will be available during Ihe period...

Scope Spectacular

DC to 20 MKi, 1 mV 0'- Oua Tiatt Featu.res 6' Rr*clanguiar CRT Full 2 yea* pans and labor warranty (w twO XI probesi. DC to 20 1 mV dkv. Dual Trace. DC oflaei loi OMM Outrai Venule Mode Tngger t CttT w MD X10 probed DC 1o 40 M Ht Other features same as V-222 iw two X1 X10 probes DC to 100 MHz. .5 mV dlv, QuarJ Trace. Delayed Sweep, Full r V Trigfltfring. alternate timebaae hw.two 0 probes) DCto60WMJL 1 mv.div Inpta trace deiaj, sweep F Ltl I T. V T T r jjer in g , a r. able tr gge r h nid- oft...

Multiband Sloper

ALSO CUP Ol ES limited Space anmnnas Oulilwdkng tiformtncDcr W INriinitnn Is wolllnownl Nawen- cy mullib nri BIG SIGNAL r pt iur Aularnilic bandiwtlcfiing Vorv I low SWR'Com l Ml-3kH pow r Compact- F LLT ASSEMBLED I ro fAur tp -itltd Cdnlat i 9vACt IChbiri lt j - E gt T msT T - T r y flr ru ' r iiliuCliifli - ' if l '1 1 ltcl fC plrt 44MND SLOFBt - 40 H, A0,30. Of 3DM frO U long J 4 ft tJ i - H 4 lt W M - Y 9 HO-THAP OiPOtE 0 SO 40 113 It long 1 M h trtw mu - I M 1BAM SJ'JU fc SAVfcH niPCH.E...

Match Most Antenna Feedline Combinations To Your

MATCHES dtpoles inverted vees beams quads verticals, mobife whips, random wire etc that are feci by coax, balanced line or single wire MAXIMUM POWER 300 waits RF INPUTS (selectable Irom front panel) 3-coax Vdirect. direct or ihru tuner 1 balanced line U 1 balun > nc ) or single Atre IN-LINE CALIBRATED WATTMETER INCLUDED GrftflrtviMfr, HH 0304 (603) 6 1033 lelai 8 7697 GrftflrtviMfr, HH 0304 (603) 6 1033 lelai 8 7697 ShackMaster1 puts yon- notne station in me pa m oi your nand. Wether ponable....

Special High Speed Amateur Morse Tests

Our DOC will now provide high speed Morse tests as n permanent service lo the amateur fraternity. The mam aim is to assist amateurs to obtain a reciprocal If cense *hen visiting overseas countries where Morse speed standards are higher man m Australia. Tests 3 speeds or 12, 14 15. and 16 words per mmute were utilised during the trial period Tne following conditions are applicable to the new arrangements which are now In force Amateur licensees may apply to sit for high-speed Morse lest at any...

Renato Costa Ptaj

During my trips to northeast Brazi- due to my fob, sometimes I have a chance lo see 1 Hands who I never (bought I'd meet personally. One of them was Renato Costa PT7AI He is retired (and very proud because he Is now a great grandfather) Renato was licensed only a few years ago. and since then he has become an avid DXttv He has 142 countries worked, most of them confirmed- He's a very charming person and don't iose the opportunity of a QSO when 68 73 for Radio Amateurs * August, 1985 Africa...

Mosfet Repeater Ample Feers

Mixlel 4111 2-Meter Repeater Amplifier 20 Watts in KX Watts out 10 Watts in - KJWatootf gt Watts m 30 Watts Hodd 4114 2-Meter Repealer Amplifier La- 1365 2 Waits m 10.' Watts out I Watt m Ki Watts m Model 4112 lb, Meter Repeater Amplifier List 11 gt Waits in 70 Watts out MudeJ 5142 70-Cm Repeater Amplifier list 1375 30Wansi i 10 1 Waits out 10 Watts 1 - 40 Watts For more information see your local dealer ortalJ factory for details. Post Office Box 8979 Newport Beach, CA 92658 Telephone 714 760...

The Field Award

The Board of the Swedish Amateur Ra dio Society. SSA. has ta en the decision io issue The Field Award to licensed radio amateurs for verified contacts with, and to shortwave listeners Tor verified reports from, other radio amateurs In a number of fields. These fields are defined by the Locator System adopted by IARU as of January 1, 1985 The Maidenhead Locator Contacts on o afte- this date are va'id for The Field Award. The Field Award is Issued lor verifica tlons of fields in four classes...

Sssa Special Event Stations

This year of 19& 5, Sveriges 5 and at amatorer celebrates Ms 60th anniversary. The Swedish licensing authority ga e the SSA ihe opportunity of using the very rare 7S prefix lor this occasion during Ihe period April 26 to May 31.1965 Various radio clubs were part of this activity by being able to use the special call for certain club activities for a few days each. Tfwe was one special cai i on the air from each of the 3 can areas i.e., from 7S1SSA to 7S7SSA and 7S SSA. If you have worked ail...

Spreadspectrum Communication

Has been approved for amateur use on frequencies above 420 MHz, but there is a catch. Although the final ruling has been published, it will be one year before any transmissions will be allowed, This is, according to the FCC. in order to give the amateur community time to develop initial voluntary interoperability standards as they have done recently in packet radio. In other words, time to get our act together There also will be a limit of three possible spreading sequences so that monitoring...

Mfj Multifunction Mfj Tuning Indicator

Greatly improve your RTTY copying capabilities. Add a crosshair LED Tuning Indicator thai makes tuning quick, easy with pin-point accuracy Add mark and space outputs for scope tuning. Add LEDs lhai indicate 170. 42b. 850 Hz shifis Great for copying RTTY outside ham bands. Add sharp mark and space filters to improve copy under crowded weak conditions, 170, 425, 860 Hz shifts. Add Normal Reverse switch to check for inverted RTTY without retuning. Add output level control to adjust signal into...

To Oroer Or For Your Nearest Dealer Call Tollfree

800647' 1600 Call Hi-323-bfi69 in Mjss and outside continental if a Tele* 53-4590 MfJ STKV 73 foi Radto Amateurs * August 1985 15 Celebrate 25 years of 73 for Radio Amat by treating yourself and a fellow ham to an unbeatable subscription offer Here's how it works When you get a friend to enter a paid subscription to 73 for the low one year rate of 19.97, you can renew your own subscription for an unbelievably low 12,48 a 50 savings off the regular renewal rate You don't need special...

Kpa Watt Cm Atvtransmitter Board

APPLICATIONSl Cordless c ri.jc- TV camera *c-r A iilier nut . sefv - events remole VCR *tt Remote control oi R C airplanes or robots. Sho* home udWJ Tapes ivomputor programs, repeal SSTV to local ATVsfs D* aepends on nnl nnas anrJ lerram typ tc miles FULL COLOR VLOEO ft SOUND on one small 3.25*4 board RUNS ON EXTERNAL 13.S VOC at 300 ma supply or& nltery TUNED WITH ONE CRYSTAL on 426,25 434 0 439 2 AUDIO INPUTS L_r Z - anc i ne SlJij. input fou' 0 portable Color cameras Cfls or home...