Indoor Tuned Active Antenna

World Grabber rivals or exceed) reception of outilde long wlret UniQue tuned Active Antenna minimizes tntermod, improves select ivity reduces noise outside tuned band, even functions as preselector with external antennas Covers 0.3-30 MHz. Telescoping antenna. Tune. Band. Gam, On-olt bypass controls 6x2x6 in.Uses 9V battery, 9-18 VDC or POLICE FIRE WEATHER 2 M HANDHELD CONVERTER Turn your synthesized scanning 39.95 2 meter tiandhefd into a hot Police MFJ Fire Weather band scanner* 14 -14S MHz...

Info

Available from your dealer In U.S.A. add 2.00 Handling 333 W. Lake St,r Chicago, IL 60606 (312)263-1800 hf i52 AZDEIV FLS SOtf H f MFM . SCAN J. U.li . . . flZIJEN PCS-400< .i HC I4_E , 2SW - 1 6 MFMHSr_AN. KDI Mil* 3 I E, 1 ErlF'O S- 3 H J M h THUMBWHEEL, . . I MPO S-iSI 5 WllH If, r E ruNt PAD. i F NIFE. H 1 2.5UM 0 MFM. SUAN. L.L-EJ. . jW i 1 MElt, SCAN . L JO- - - -r .SW,10 MEM,SCAN,LCD. H i 5PAFVE. HAUE-lRY FOR PCS-SPO. nr-Lf I Fftl HE-R UA L FOft PCSv tXN * 5'u 03 FAHF- A1 TE ft Y FGR...

Prices Subject To Change Without Notice

AM pans fTiay be i> ew or surplus, and p-irts may be substituted comparable parts we are out of stack at an item, WATKINS JOHNSON WJ-M6 Double Balanced Mixer 10 and RF 0.2 to 300MHz Conversion Loss (SSB) Noise Figure (SSB) Conversion Compression IF DC to 300MHz 6.5dB Max. 1 to 50MHz 8.5dB Max. .2 to 300MHz same as above 8.5dB Max. 50 to 300MHz .3dB Typ.

Software Piracy

There is a problem in the amateur-radio fraternity . .software piracy. Whether by ignorance or simple disregard for (he law, many amateurs are stealing copyrighted programs. Most do not consider their iheft a crime or a serious problem, but unless this practice is discontinued, amateur radio will suffer. With the influx of computers inlo the hobby, a degree of software piracy was in-evltable. Unfortunately, the problem has become a blemish on amateu* radio. Thousands of dollars have been spent...

Kenwood Trcall

TE N T E O 2 5 9 1 III I i i i r i I i I H H I r t 1 i m i i ' i 0 0 ICOM TOKYO HI POWER amps less 15 VOCOMM TOKYO HI POWER KC2000 tuner 289.95 TOKYO HI POWER HC400L tuner,, 129.95 TOKYO HI POWER HC2Q0 luner 59.95 DRAKE WM. NYE MBA 3KW tuner & ant switch 469,00 WM NYE 16-6 phone patch for ICOM (8

Rgr

1 1 E Longvie* PO Box 5234 Mangold Ohio 901 f See Li st of Advertisers on page 98 LARSEN NMO ANTENNAS, PO K MOUNTING KITS The Larsen PO K mounting kit leatures SQ-239 style mounting hardware itial can be installed entirely from outside the vehicle. The PO series mount looks like the SO-239 connector sometimes calted a female UHF connector), but uniifce Ihe SO-239, it can be ins tali ed from outside the vehicle its two O rings and one gasket offer super moisture sealing. around mounting hardware...

Director

Australian parasol beam antenna, Construction is similar to one frame of a cubical quad but plane of loop is parallel to surface of the earth. Array is horizontally polarized. Fig. 7. Australian parasol beam antenna, Construction is similar to one frame of a cubical quad but plane of loop is parallel to surface of the earth. Array is horizontally polarized. One of the features of the parasol array that first caught my attention was its small, compact size. I immediately had visions of a...

Ege Has Everything For The

The word amateur is a little misleading. There's nothing amateur about the way hams maneuver signals successfully through the airwaves. It takes a unique blend of human skill and product excellence. That's why so many amateurs gravitate toward Larsen amateur antennas. Larsen antennas are designed by engineers who know amateur radio from the business end of the mike who make it their business to see that every Larsen antenna goes the distance, or it doesn't go out the door. As with our...

St Peters

The Si Peters Amateur Radio Club will operate a special event station irom 1700 UTC, Saturday, October 6, to 1700 UTC, October 7, at the Daniel Boone Home, Femme Osage Valley, St. Charles County, Missouri. The event is to commemorate the place where Daniel Boone frontiersman, iudge, trapper, surveyor, builder, and family man, spent the last twenty years of his life. The weekend celebration features a black powder marksman contest for local participants. One complete 2-way contact is needed to...

Mfjq

ID timer alerts every 9 minutes after reset Switchable seconds readout. Elapsed timer. Just start ciock from zero and note lime of event up to 24 hours. Bright blue 6'1 digits. Alarm with snooze function. Synchronizable with WWV. Lock function prevents mis-setting, Power out, alarm on indicators. Black 5x2x3 in 110 VAC 60 Hz Dual filters give unmatched performance The orimary fiiter ets you peak, notch low pass a' high pass with extra steep skins Auxiliary...

Hf Antennas

I BR- i h O MINI-PRDD Mil STIN fmcoj WjLSQN' MflCCI WILSONtMACD) HF6V 1O-0OM ft 30M VFF.T i TAI , 1 5+00 HFAVJ EJ F'ORT M DEL . . , , 25*00 Root noun Kn for hf v flz.o SlUB l Nf.D FrADLrtl KIT FJOl- HF6V2& *00 t O Mt I El' M r FOR HI y . y 00 HQ - I MIN & LIAD. 1 4t> -00 S0-20M T El. E RF ft. . L OO IO-20M 6 Fi.E. PFAM. . . OO

Element Fill In The Blanks

Fill in the calls of these prominent hams of the past and present Iran's son novr the current Shah) 5 Tom Christian _ In Spanish ever published and distributed In 19 countries. If you would like to take a look, send me your address and I will lorward you a sample. Maybe you would like to include, with your request, news from your radio club for publication. It somebody Is publishing something similarT an exchange is desired. Polish, Chinese, and Swah'li bulletins are accepted.

Economy Preamps

mm iiiataaaiiaa Ma SAVE A BUNDLE ON helical resonator VHF FM TRANSCEIVERS preamps Call or Write for FREE CATALOG (Send 1.00 or 4 IRC'c for overseas mailing) Order by phone or mail Add 3 S & H per order (Electronic answering service evenings & weekends) Use VISA, MASTERCARD, Check, or UPS COD. 65-D MOUL RD. HILTON NY 14468 Phone 716-392-9430 Hamtronics is a registered trademark For SSB, CW, ATV, FM, etc. Why pay big bucks for a multi mode rig for each band Can be linked with receive...

Advertising Copy

Advertising muff pertain to amateur radio products or services No special layouts or positions jrt possible. All advertising copy must t> e submitted type ri en idouble-sprici-d and mus< include full name and address limited to 100 wo*ds, maximum Count only words in te*i Address, tree 73 cannol .en'T advertising claims an.l r.annol be held responsible id ciatms made by (he advertiser Liability will be hm-ted to mating ar,> necessary correction m the rvtKt a*airahr .ssue 73 reserves the...

Connectors Made In

PL-259 P L-25V piisfi-on adapter sheiJ. . 10 13.89 PL-259 & SO-239 . 10 5.fl9 Double Male Conneclor i 1.79 PL 25fi Doiible female Connectoi 9fle itt patch cord w'RCA type plugs iach i. fid 3 i.OO RedMiffi UG-ft& or 176 fOKI.99 Elbow F59A jTV typek (JC 1D iJ Arrpnenol Tvce N M& e lot RGS 3.00 BNCUGflaC.'U male Sf.25 3 16 inch Mike PiUQ ior Collins etc 1.25 UG273 0NCIO PL-259 S3 00 FREE CATALOG COO add 2,00 FLA, Res add S Sales Tax Connectors shipping 10 add'l, 3,00 minimum Cable...

Int

Hiam MasterTapes brings the best Dossibie personalized Ham Radio icense preparation right into your own iving room. If you. a friend or family nember wants the best help available to et past the FCC test hurdle, its available now in Beta or VHS home *ndeo format. Larry Home, N2NY brings his 33 ears of Ham Radio teaching experience right to your home. Each of the 26 video essons has close-up details of com-Donents and systems along with superb graphic drawings. Each lesson has important points...

In Usa Larsen Electronics

11611 N E 5 TH AVE RO BOX 1799 VANCOUVER W1A 90666 20e-573-2722 tN CANADA CANADIAN LARSEN ELECTRONICS. LTD 283 E 11TH AVE UNIT 101 Vancouver BC ST2C4 604 872-8517 Here's a shock Youve been wasting money on towers and poles. W1GV explains why low antennas may outperform high-altitude aluminum. Stan Gbilisto W CV 4 PO Box 561652 Miami FL 33156 Fig, 1. During the hours of daylight* the ionospheric F layer sometimes splits into fwo parts, as shown at faI These regions occur at altitudes ot about...

Newsletter Of The Month

.'-1C- .T _ji.rvi-IC AMATHUR RADQ CUUS AM the news that fits, we print'1 seems an appropriate motto for REMARCS. chronicle of the Mid-Atlantic Amateur Radio Club. Editor Kay Craigie KC3LM realizes mat no one wants lo read endless minutes arid committee reports month after month. After all, those who are interested in that brand of tedium can near it all at the club meeting. Instead, Kay draws upon outside sources such as West (ink, Woridradio, and the WSVt Report to fill REMARCS with truly...

Output

Pulse-generator circuit (block diagramI techniques available to the amateur one uses a real pulse and the other a square wave. Equipment needed for these techniques is rather simple, except for the 'scope. The oscilloscope needs a bandwidth of 5 MHz or more (preferably more). In addition, it must have a horizontal sweep calibrated in units of time (e.g., (is cm). The signal source can be any pulse or square-wave generator, either commercial or home-brew. In researching this article,...

Hf Mobiles Deliver Fixed Station

Hustler HF antennas deliver outstanding signal reports wherever you're mobile Design your own HF nnobrfe from a full selection of top-quality ILS.-made stainless steel ball mounts, quick disconnects, masts, springs, and resonators, You can cover any Mo-80-meter band. Choose from medium or high power resonators with broadest bandwidth and lowest SWR for optimum performance on any band. Easy band change and garaging with Hustler's fold-over mastr too. Ask any ham the best mobiles on the rood come...

Jc

Variable frequency modification. sweep is constantly retrig-gered regardless of whether or not a signal is present in the vertical channel. Thus, we will see a constant pulse tram at the + GATI output during auto-trigger operation. If you plan to use a square-wave generator as the signal source, then it may be advisable to improve the rise time of the signal. Fig. 3 shows two buffers that can be used. The 74H00 is a high-speed version of the 7400 two-input NAND gate. This device is...

Tss Filters

For superior performance at lower cost, use toi rated 8-poie f-ox Tango crystal filters to fill the optional spots Jh your rfg For example, our 1 BOO Hz FT2808 equivalent of the YK88SN has 60 6dB shape factor of 1.7 compared with 2.0. a price of S55 vs 63, and squarer shoulders ai the top wiih steeper skirts all the way tfown to more than -SOdO For more pleasant atudio use our 2100Hz for SSB and or ou r 6oooh2 for AM For CW. ou r 400Hz unit is better than the YK88C while our 250Hz is sharper...

Yeq

SENSITIVITY SECOND TO NONE TYPICALLY 0.1 5 uV ON VHP. 0,3 uV ON UHF< SELECTIVITY THAT CANT BE BEAT BOTH 8 POLE CRYSTAL FILTER & CERAMEC FILTER FOR GREATER THAN 100 dB AT 1 2KH2. HELICAL RESONATOR FRONT ENDS, SEE R144, R220, AND R451 SPECS IN RECEIVER AO BELOW. OTHER GREAT RECEIVER FEATURES FLUTTER-PROOF SQUELCH, AFC TO COMPENSATE FOR OFF-FREO TRANSMITTERS, SEPARATE LOCAL SPEAKER AMPLIFIER & CONTROL CLEAN, EASY TUNE TRANSMITTER UP TO 20 WATTS OUT UP TO 50W WITH OPTIONAL PA). HIGH...

Aea Marc

AEA PACXET-PKT-1 packet controller assembled, tested-complete incl. pwr ready to go . .499.95 SWLTEXT software C 64 99.95 MBA-TOR software W llH rt seems like the contest season jusi ended yet here ii is again That rreons It's lime to check out oil the equipment a no the antennas Coax seems o be the oiggest problem a own this yea- So be sure that you check out Ibe coax so you can get the lasf bit of gain from *he omen-no BFL.DEN has a new affordable professional coax friat is ve'Y popular wifh...

Reflected Pulse

TDR u rh a pulse-train signal source. where L is the line length in feet V is the velocity factor (0-1), T is the round-trip time in microseconds, as measured on the oscilloscope, 983.5 is the speed of light in feet per microseconds (ft js and 2 represents the fact that T is a round-trip time. We can rearrange the basic equation to also find I or V, as needed Let s work an example of each. Let's say we have a long piece of 75-Ohm coaxial cable used as a data line between 1 lie computer...

Peterborough

The Peterborough (Ontario) Amateur Radio Club is offering a distinctive bicentennial certificate to amateurs contacting Peterborough amateur siations during 19fl4i Ontario stations must contact five Peterborough amateurs. North American stations must contact two. and DX stations must contact one. Use any band, any mode. Send 51 and a list ol contacts as well as date and time of contact (no QSLs required) to Peterborough Amateur Radio Club, PO Box 1205, Peterborough, Ontario K9J 7H4.

Spuu State Relats

Model EC5-215 PRICE EACH 7,50 ( r ii sby Barton H del LrB74(K> PRICE EACH 7.50 I20vnc contact at 7 amps or 2Damps on a i0x 10Mk aluminum. Heatsink with silicon grease, 24UVtic contact 1imps or 40am ps on a 10* 10k .124 aluminum. Heatsiok with silicon grease. 240vac contact at 15aynps or AOamps on a 10x 10* .124 aluminum. Heatsink with silicon grease. NOTE *** Items m& y be substituted with other brnnds or equivalent riodel numbers, All parts may be new or surplus, and parts...

Tomfuteps Oscar At

0 PERATI NG CUUFTESY RULES A1-- f STATIONS OP ERATI P R111 CURES PAL10 HAVE PROPAGATION AMATEUR RAD J O in> ACTICE ELECTRICAL PRINCIPLES CIRCUIT COMPONENTS PRACTICAL CIRCUITS SIGNALS AND EMISSIONS RADIO WAVE PROPAGATION EMERGENCY COMMUNICATIONS TRAN5MITT El jl> 1J W LLMI TS STATION-ID REQUIREMENTS T-jlRD-PARTY PARTICIPATION FREQUENCY BANDS SELECTION OF FREQUENCIES T ,C. MODELS FS0KL5ITI1 PPj cnCZS RADIOTEUEPHONY VOX TRANSN 1 TT EK CONTROL BREAJi*1 N TELEGRAPHY ANT ENNA OR I EN T'A TI ON...

Entries And Awards

All entries must have a log and sun* mar> sheer and if more than 200 contacts are made, a dupe sheei should be i nr. _ jed Entnes may be disqualified if logs are in complete or too many errors are detected You ti js sign the summary sheet stating that you observed ail the rules. You may photocopy log and dupe sheets or you may ootain extras from the HARC ipiease senc SASE). Logs must be received by No ember 12th and should be addressed to ihe Hermiston Amateur Radio Ctutx PO Box 962....

Type Connector

OMT A.JN IN Cil 1 PQU NOFMAl L Y OPEN SWITCHES. MEASURES 3V LONG NORMALLY OPEN SWITCHES ASURt - LONG. S01 CI I- I iPr SUB MINIATURE CONNECTORS USED FOR lUfl'PI IT F R HOOK UP5 DB 25 SOCKET S3.& 0 D 25 HOOD PARALLEL PRINTER CONNECTOR SPECTRA STRIP ft D MArtM B STRIP CA STRANPl . AIU* S& .0O PER ROLL l 0O FT ) 10 AMI . MC g 'ENEflGiZE COIL TO rT OPEN contact COIL 3 .iChM OHMS SPEC *L OC EACH

Ark Cr

No other repeaters or controllers match Mark 4 in capability and features. That s why Mark 4 is the performance leader at amateur and commercial repeater sites around the world. Only Mark 4 gives you Message Master real speech voice readout of received signal strength, deviation, and frequency error 4-channei receiver voting * clock time announcements and function control * 7-helical filter receiver * extensive phone patch functions. Unlike others, Mark 4 even includes power supply and a...

Propagation

As these lines are being written, the long hot summer IS upon us. VHF conditions vary from good to excellent with the typical eastern Mediterranean tropo-spherlc ducting facilitating daily two-meter contacts between Israel ana Cyprus and someilmes the Greek Islands On HF, ten meters is all but dead, but twenty meters is the star with ihe band wide open to North America during the late night plus long-path propagation to AustrallaJNew Zealand in the early morning. Fifteen meters often comes...

Element Truefalse

1) The FCC programs its computer so it won't Issue obscene or sug gesiive amateur call- 2) AM broadcast stations east of the Mississippi 4 A broadcast station may select irs call- 51 OSCAR 6's calisign was W120SC. _ _____ 6) Lee DeForesi famed radio inventor, held 7) The FCC issued the first K calis to continental US hams 9) The Federal Radio Commission began Issuing W and K calls In 11) Hiram Percy Maxim's first calisign was 12) Marconi once received an FCC Cilallon lor failing to properly...

Awards

Certificates awarded to top-scoring station In each state, province, country, and Ri county plus top-scoring Novice and Technician in RI and out of state There wilJ alio be a certificate for the top RI multi-operator station Logs must show dat& lime in GMT, caii, exchange, band, and mode Include your name. call, mailing address, club affiha-lion it any. total OSO points, multipliers claimed, and final score Entries must be postmarked no later than November 15th and should be sent to Easl Bay...

Hat Rock

The Hermiston Amateur Radio Club will operate KC7LK from Hat Rock State Park from 1300 GMTh October 13th, to 0100 GMT, October 14th, and between 1800 and 2200 GMT on October 14th, The station is commemorating the 179th anniversary of Lewis and Clark's visil to Hat Rock and will be operating in conjunction with the Oregon OSO party. Operation will be on the General phone and Novice CW bands. There will also be some 2-meter and 440-MHz operation. For a certificate, send on EASE and your contact...

Eh

The new Kan Ironies Challenger makes you the winner with superior performance at a, knockout price The Challenger terminal unit is designed for RTTY ASCII AM TOE operation with any oi the Kantronics software programs, Compare our specifications with the competition, then check the price. Challenger's four pole switched capacitance filter ives sensitivity and selectivity found in units costing much more. And with only 5mvRMS ot audio requi ed to drive Challenger, you can really chase the weak...

Telephone

.I in tri irom .H- r 5BUFCf Hi l lil lud I I 5 5 ' C f W t l r.nn . urM.- Ii Jiy L tvl'-H f l - Ml n i H'.i I-1 JfiV .t -y m IH h- L n i , yju < C C-n l- in dI .1 L- p Pr i . f3i- -1 h ' HqWT r ro-tn In- T I red Iii IL-' DI < > CGM m I When u i g RVI wnlr ll r iL UM 'ii50 E il -Viiiirt MCb GCfi. h-iniinf.n-, (ir.h Kaa - I POf I ICCJM ir I ir AT. na m r.V Tio-p pjiyttiml vim nur alii- - yfl ly wTl- C-.r 1 T. diflll pe liiI thiljPAP 1 wj-Ii H reiHp -0 -, ii'-i'ifi M Li * * . I Lintt franft...

Surge Protector From Alpha Delta

Inc , Model ACTT ac Trans Trap1'' is a direct piug-m-the-wail ac surge protector which Includes two 120-V ac sockets, status light, circuit breaker, and a unique 3-stage automatic surge-protection circuit. The Model ACTT provides both transverse- and common-mode protection with a hoHo-miutrai, neutral-lo-ground, and hot-to-ground (iCQO-volt. 2000-Amp surge discharge soif-restoring h> gh-5p-i d circuit. (Several typncai competitive devices use only a...

Using The Aod Apogee Predictions

Apogee predictions for the month of October are provided for three sections of the United States Washington DC at 39N 77VJ, Kansas at 39N 95W, and California at 38N 122W Times are in UTC and apogee in this case is mean anomaly 128 rounded to the nearest whole hour. Use the chart as a guide In aiming your antenna, then line-tune the azimuth and elevation values to peak ihe satellite's beacon signal. IT you require more accurate orbital predictions, contact AMSAT at PO Box 27, Washington DC...

Packet Radio

USA AX.25 is the AMRAD approved digital format STANDARD used on amateur packet radio networks._ AssembledfTested, NoICs. 90day warranty Package of all ICs except 2 2716 EPROMs 80.00 System Tested 4.5 x 6 board complete with afl fC s and programmed EPROMs personalized for each purchaser. Requires only single 8-10 volt Ya amp power. 1 year guarantee of hardware soft-ware AX,25 standard RS232 serial ASCII at any user baud rate.RS232 HDLC for 202 modem used for AFSK or direct to RF equipment for...

Ham Help

I neecf a manual and plug-in memory modules for a Memory-Malic HOOO Keyer by Data Engineering, Inc. K. 0. Benton K4FHQ 333 CrosshiU Lane Warrior AL 3M0O I'd like information on interfacing a Motorola speakw mika to a Yaesu FT-2QBR. 1 have it hooked up but the speakertmike overheats. Art Gates K9G& N 122 Arrow Drive Pekin L 61554 Helpl Where can 1 get a 10m SSB conversion kit for my Sears 663-3010.005(1 CB transceiver before I go back to Europe Klaus Stichfernath N2EHQ 68 Mandalay Drive...

Twinlead To Shack

1 1 x 1 wood six feet long 2 1 x 1 wood 20 inches iong 2 Plexiglas for insulators 1-5 x 3 use the thickest type you can find. Screws, nuts, and washers to mount the insulators and booms Solder lugs and standoff insulators (if balanced line is used) U-bOlts to mount center support to mast

Radio Amateurs Operating Themalf Marathon

For first lime in BrajH and we never heard about thus anywnere else beforei two radio amateurs jomed ihe lace of the Bridge and put it on the amateurradio atr. T e rtaceo* the 'idg 15 a ean> competition. a cross-country naif marathon. organized oy the CORJi- Rio de Janeiro Runner Association and sponsored by the Bradesco-Atlantic a organization a bann an msirance company helping amateur Sports. This 22,400-meter long race (a halt marathon as it s called herei crosses me longest concrete-buiU...

Easytoassemble

H-5 2sqft ant (for M -13 above) S302.00 PPd. Ail HiZRrs nckide wir cfi. table A rid 3-fl EE - -' x. 6 forged SteeJ eye and eye 6 d am 4 fi long eanh screw anchor OD 7X7 Aircraft catile guy Aire I 700 lt> Vy-115 - 115 VAC Winch - 1000 tb load 329.95 WMOQD Manual winch 1000 lb. tapacity J 95 W-140G - MaHijal wmch 1400 lb. capacity 29.95 P-2Q6B Pulley block fo* 3.-16 cable 5l65 50 M-lSS iB ir ch rar jtlurrtBujm tower lainlasE bolts HAZER TS-25 hearing and I i ngpd baflieaystem (1523.00 freighl...

Antenna Design Software

Smit Software Sysicms nas released their iatesi ha rrn-ei a ted software package for the Apple II-r and He computers Antenna Design Software is a menu-driven pfogrdm composed of twenty-si* submod ules 10 help in the design of HF VHF UHF antennas and transmission lines. Capabilities include design of antenna Types such as dipcie. folded dtpo'e. vertical, long ire, 2- and 3-elemfn( Quad, parabolic dish and loop Ht is also prodded with calculating feedlme losses phasing lines, transmissfon-nne...

Equipment

As you know, Madison is an authorized dealer tor all the pooular equipment lines such as DRAKE, KENWOOD, YAESU ICOM, KDK, TiNTEC SANTEC etc. BE SURE TO CALL US FOR A PRICE BEFORE YOU MAKE ANY EQUIPMENT PURCHASE. WE WOULD LIKE YOU TO BE OUR CUSTOMER, KDK FM4Q33 NEW KDK FM2033 SANTEC ST142 + +FREE GOODS++ ,, , 299.95 SANTEC

Movi

Let us know 8 weeks in advance so that you won't miss a single issue of 73. Attach old label where indicated and print new address in space provided. Also include your mailing label whenever you write concerning your subscription. It helps us serve you promptly. Write to Subscription Department Amateur Radios P.O. Box 931 Technical Journal Farmingdale NY 11737 Extend my subscription one additional year tor only 17.97 Payment enclosed Bill me Canada & Mexico 20 97 1 year only US f undi drawn...

Peru

Suarez OA4KO YV5 Apartado 66994 Caracas 1QG1-A Venezuela t have resided in Venezuela since 1973 and have written several columns here about that country, but as a Peruvian I miss the flag of my own country in 73 International'1 and that's the reason I'm now at my computer, writing about amateur radio in Peru. I hope thai somebody down there in OA-land teels motivated to become a correspondent lor 73 International 1 I wish you readers to know that I nave little material since I left my...

Voice Operated

Fits inside most HF-SSB transceivers. Requires voice to activate. Ignores noise and hetrodynes. On off switch only no adjustments Connects to audio leads and 9 or 12 VDC. Fufly assenbied and tested 99.95. Complete with comprehensive manual. Used worldwide in commercial and military transceivers. COMMUNICATIONS, 5479 Jetport, Tampa, FL 33614 (813) 885-3996 - at last *, -your shack organized A beautiful piece of furniture your XYL will love it Designed with angfed rear shelf for your viewing...

Cquplsng

Fig. 3, How the grid-dip oscillator is coupled to the feed-point of the driven element fsee text). element and recheck the resonant frequency of the 10-meter driven element. Third, resonate the 20-meter driven element and recheck the resonant frequencies of both the 15-and 10-meter elements. In the prototype array at W6TYH, the interaction between the three driven elements was negligible as far as the dip meter indication was concerned However, when each driven element was being adjusted for...

Accessories

SANYO AA NICADS 2 per pack S4.00 TRIPLET model 50 FLUKE 77 auto-ranging digital multimeter 115.00 COBRA, MAXON 49mhz headset units 39.95 ALPHA DELTA MACC-8 surge protector 73.00 BENCHER BY-1 paddles, black 42.95 BENCHER By-2 paddles, chrome 54.95 B R O PLE X . it I I n I I p -I r -i f i I - r I I 3SS BIRD Wattmeter 43 & elements in stock CALl COAX SEAL per roll Miiiiiniiiiiiiiiriii 2100 QSL Card holders for 60 cards 2.00 TRIPPUTE PR25 20 amp 12VDC regulated ., 99.95 TRIPPUTE PR35 as above...

The Dr Digital Poll

It's hard to judge what interests the typical Dr Digital reader solely from the mail I receive. Only certain people are motivat ed to write letters for most, the process takes too much time or effort. I am going to get around this problem by conducting a poll While John Edwards' FUN poll revealed some information about the computer habits of amateur-radio operators, it was not specific enough for my needs. So grab a pencil and answer the foftowing questions. Send your responses to the address...

Moving

Let us know 8 weeks in advance so that you won't miss a single issue of 73, Attach old label where indicated and print new address in space provided. Also include your mailing label whenever you write concerning your subscription. It helps us serve you promptly. Write to Subscription Department Amateur Radio's P.O. Box 931 Technical Journal Farming dale NY 11737 Extend my subscription one additional year for only 17 97 Payment enclosed Bill me Lanada & Me*ic.o 2Q 7j v< > -'n onCv US I...

Fea Tures

RTTY ASCII CW COMPUTER INTERFACE mfj-M 99.95 I- W A A -A- _ - ' j Send and receive computerized RTTY ASCfl CW with nearly any personal computer VlC-20, Aopie TRS 30C Atari Tl-99 Commodore 64 etc. Use Kantromcs or mast ot er RTTY CW software Copies both mark and space, any shift > ntlucifng 170 25 B50Hzianaany speec (5-100 WPMFTTY CW 300 baud ASCII Sharp8po e active filter fo CW ana 70 Hz shift. Sends 170 850 Hz shift Normal,'Reverse switch eliminates retuning Automatic noise limiter...

Hr Hr J

WATeHS JOHNSON WJ-V907 Voltage Controlled Microwave Oscillator Frequency range 3.6 to Power ouput, Min, lOdBm typical, BdBm Guaranteed, Spurious output suppress-on Harmonic (nf0), min, ZOdB typical, In-Band Non-Harmonic, min, 60dB typical, Residual FM, pk to pk, Max. 5KHz, pushing factor, Max. 8KHz V, Pulling figure (1.5 1 VSVIR), Hax. 60MHz, Tuning voltage range +1 to +15volts Tuning current, Max, -0.1mA, modulation sensitivity range, Max. 120 to 3Q'-lHz V, input capacitance, Hax, lOOpf,...

Low Loss Foam Dielectric

Shield 1 .9 100 ft. or 17tfiL RG59 U 70 copper RG5SU 00 Shield RG58U 95 RG59U 100 foil Shield TV type 10 ft. RG8U 97 V0 shield 11 ga. iequi Balden 821-11 Heavy Duty Rotor Cahfe2-16 ga. 6-iSga. . SiS fL Rotor Cable fl-con 2-18 ga. 6-22 . 19< Jft- HGfitU-20it, PL -259 ea. end RG2MU dbi silver shield, 50ohm BELDEN Co& x in 100 tL rolls RG5SU 9201 Grounding strap, heavy duty tubular braid 3 16 in. tinned copper lQ tt. 3 8 in. tinned copper 30e 1t,

Sharing Ideas

Pertboard and Solder t at I**, which appeared in the Jufy, 1984, issue of 73, has brought some welcome correspondence. The letters below add some Important ideas to those in the article More important they illustrate orte of the most important ideas in ham radio the willingness to share freely experience and ideas that might help other hams. I want to thank both gen tie men for writing and for adding to my own stock of construction ideas. No one knows everything, and perhaps it fs even true...

Special Offer

R HJTfHt Kaiii'fPAN HOIOP*X TOGfTHEP 7 U* CkMI Tf M ItHflmOh TOflE FhEP - F tJ- H f A'. Ol i t*tA L tout IClGfKLflATE DOTS AND DASHES n> TOUCH OF FlhGCP ' O HOVlHa p mfji covn COmPIITI WITH ALL ftiCTH0*ie m l SS CAM AKD poiyer SUPPLY VARIOUS CLOCK KITS H LUKiiM'min m HUH 1T E . i ' c*. > 4aumwu4i COMPETE LESS pcwvepsvpp AOAFTOH AXD CAM ituhS Oii 'iivOLFiC itwnri hiou'flti no WA 6DKHT ELtCTHOWCUJCHlUT FCWMAT OULT OPERATE ON tZVQLTS A.C Oft DC HA5 r. E BASE OHMAftD owts f Tf JM Ortf AOAPTW...

Roensch Microwave

RH Bo* 156B PR 316 963 2 50 BflOOKFlELO, MiSSOURI 6462B For HT owneis operating insidt a vehicle and wanting increased T R range, RF PRODUCTS has the low cost solution- Remove your BNC antenna from ihe HT and mount on the RF PRODUCTS BNC magnet mount, mstati the magnet mount on the root topano connect the BNC co-a* connector The magnet mount (pan no 199 445)has TO feet of small (5 32) co-an with BNC connector attached and is priced at 15 95 (including shipping by UPS to 48 states) TO ORDER -...

Ssr Cw Htty Sstv

Spurious Outpufi lntii mnciuiiiiiorp Nri'moruc output 65 wads minimum iflp i nirs S b npmmai 150 ftat s ma* f-cir 1 krittln I OC Inpul Wwgm 600 u lU m SSB mode 17D yells m CW cde Negativ* po)jfH> . levei n raar adiu& tabld J lI j rjr mora Utjiaw peak uinpi I 40 db ij-r flgore trtlurt paai- uurpi.- pounds net amiti * 5D pounds gros lu hi car ion S pounds gross

The Source

144 MHz - U GH M> wt IIoilf Dill bi l price vaitaWe full Data Fflcing n Curren Catalog MITSUIS HI X BA N IWTS BISW ta A p T DRO HJ-IQIOX FC 4 GHz. I SniHMKjt. Ut'Fll CO Fl& noe F -1210 I 1.5 ar 12.0 C H-hT U Rt t tlan FQ-UPllKf Complete i ste oc ne rk, 1 4& & GHi LO Cm e uiert foi 1 ,& GH lerrsslrial m DAS FG-0P13KF DPI i xtiH T'snsMJiver M dyle Utond 15 (tBG die easi horn antenna jU P100 Ah TH SOURCE lar RETICOH Univtrul Audi Activa Fitters R5G O )g taljy ft'Oftiarom switched...

The Answers

T 2 Usually issued by the local field of fice when Gettysburg screwed up an application. 2 1 Also KN prefixes lor a *hiie. 3 1 Sort of helps to prtvenl confusion 4 1 All WR prefix repeater calls have expired 5 4 it got jviped oul rn a T936 f'ood 2 False Most, but not all (e.g., KDKA in Pittsburgh). 4 True Bui hams can't. Not fan really. 5 False Satellites don't requne call 6 False OeForesI wasn'l i ham 6 True It's a call for experimental stations. 10 False It's In San Francisco. II True Around...

MFJ

A deJuxe MFJ Keyer in a compariTonfiguration that fits right on the Bencher Iambic paddle' MFJ Keyer - small in size, big in ieaiures Curtis 8044-B ICT adjustable weight and tone,front panel volume and speed controls (6-50 WPM) Built-in dof-dash memories Speaker sidetone and push button selection of semi-automat tune or automatic modes Sc lid ssate keying Bencher paddle is fufly adjustable neavy stee nase with non-siiJd fee Uses 9 V battery ar 110 fAC with optional adapter MFJ-1305 S9 95 VHF...

TO

* out 5rHJCK OSAHDEB DA IL 30 CALL IF IF LKh PART YOU NE3U IS NOT LRTOJ * out 5rHJCK OSAHDEB DA IL 30 CALL IF IF LKh PART YOU NE3U IS NOT LRTOJ For information call (602) 242-3037 Toll Free Number 800-528-0180 (For orders only) All parts may be new or surplus, arid parts may be sub& tiiuied with comparable parts if we are out of stock of an item '

Tuning in London as easy as dialing a phone

Direct access keyboard tuning brings a new level of simplicity to shortwave radio. With the Uniden' Bearcat DX 1000,dialing m the BBC in London s as easy as dialing a telephone. And you can switch from the BBC to Peruvian Huayno music from Radio Andma instantly. Without bandswitching. Featuring the innovative microprocessor digital technofogy made famous by UnidenH Bearcat scanner radios, the DX 1000 covers 10 kHz to 30 MHz continuously, with PLL synthesized accuracy. But as easy as it is to...

Vert Input

Square wave signal generator the VR is reversed compared with VF.) Radio waves and pulses travel down a transmission line at a known velocity that rs some fraction of the speed of light (c), The so called velocity factor of a transmission line is that fraction. Thus, a velocity factor of 0.66 means that waves and pulses propagate in that line at 66 of the speed of light (i.e, 0.66c). If the speed of propagation on a line is known or can be measured, and if we have a means of timing...

Vjw

RADIO AMATEUR CALLBOOKS READY DECEMBER 1st Known throughout the world for accuracy, the 1985 calibooks list the names anU addresses you need for your QSL's, Arranged for easy reference, the U.S. Callbook contains over 433,000 listings the Foreign Callbook has over 413T000. More than 100,000 changes have been made En each edition since East year. Special features include call changes, Silent Keys, census of amateur Licenses, world-wide QSL bureaus, Internationa postal rates, prefixes of the...

Vr

Lennas (73, May. 19B4 h I wish to tnentlon Ihat the article was intended io be as tuto rial as possible. Really. I have no plans or drawings for construction and ihe intention was that you personally develop your own design. It you don't have the ability to construct a parabola, neither a drawing or a picture will help. i guess the best solution is lo make the drawing yourself and find somebody *ho feels comfortable with nechanicai struc lures lo help you in construction. Another approach is to...

Crisis

I enjoyed your editorial in the June issue ol 73 very much. Like your other editorials, It was a breath of fresh arr compared to me rsuaj vapid commentaries found in other publications, I completely agree with your comments about Morse code, i have on occasion 'read the mail (a mosl curious expression) on traffic nets on 2 meters and HF more on Ihe former) and have been totally amazed at how completely useless ana boring it all sounds. In short, your conclusions about the present state of...

Australia

B Joyce VK3YJ 44 Wren Street Alton* 30 J 8 Victoria Australia Most amateurs accept pirated* as a tacl of lit en the amateur hands, and some pirates have eventually become well-known amateurs alter they have realized what they are missinq by funning unlicensed operations, Bur when 3 wetl*tifganlzati pirate operation Atari3 10 put pre& SUfe on Ihe powers thai be for a fjlico r> i Ihe Ivwmtymieter band just above Ihe amateyr allocation, you stari io wonder what's going on, and why. I am...

Ham Radio Outlet

La Palma, 714) 761 3033, (213) 860-2040, 8etween Disneyland & Knolls Berry Farm. 999 Howard Ave < (415) 342 5757, 5 miles soulh on 101 from 5 F AirpoM AH * LIAHd ' VEt-l A T> i Ot - VM iltM XWHH * ANreWL iPEtlftUSTS - *pi L ETROfL * Hi Efl ai* & ui_T.c''it h ei A * CALLFIQOH 2811 Telegraph Ave,, (415) 451-5757, Hwy 24 Downtown Left Z71h oti-ramp XiLL1. - Uh Si JJJSHCHaM -IHtOSE EIW*.C ' HUSTLE * MH N-.A TBOhiCS ffl * LM< LftHSEK * U-SAfl * METJ * Mf J MtC LOG 5375 Kearny...

Multiband Antennas

7131 OWEN5MOLJTH AVENUE, SUITE 463C CANOGA PARK, CALIF, 91303 TELEPHONE 81B 341-5460 New Technology (patent pending) converts any VHF or UHF l-M receiver into an advanced Doppler shift radio direction finder. Simply plug into receiver s antenna and external speaker jacks. Uses four omnidirectional antennas. Low noise, high sensitivity for weak signal detection. Gal or write for full details and prices. DOPPLER SYSTEMS, INC. 5540 E Charter Oak, gqS

Now In

' ' ' V T * ' < USS ENTERPRISE * USS HECTOR * USS SARATOGA * USS PHOENIX * USS PRAIRIE * t ' . V i . -, ., , . . , . ,. > V * ' ., , - ., -K -x v . . , ' * *' ' ' ' ' . * ' ' ' . . * USS LEXINGTON, AND US NAVY M.A.RS. I- S S T T. . r .i, Florida 33060 For the active CW operator, there is nothing more fun than operating with the Doctor DX CW DX simulator. For the person who has never liked CW, Doctor DX will show you what real fun is. Doctor DX has something for everyone from the aspiring...

N

No need to compute non-resonant lengths. 3. complete elimination of RFI associated with steel guys. 4. substantial reduction in guy-installation time. 5. no more cutting of steel cable to install insulators and cable clamps. 6. no more handling of steet cable and no (1fish hook frayed ends to snag your hands. 7. non-corroding and maintenance-free. 8. high strength combined with lightweight, nonstretch and inherent flexibility. 9. a neater, more aesthetically pleasing tower appearance. 10....

Order

Super RTTY filter greatly improves copy under crowdedr fading and weak signal conditions.Improves any RTTY receiving system a pole bandpass active filter for 170 Hz shift 2125 2295 Hz mark space). 200 or 400 Hz bandwldths. Automatic noise llmiter. Audio in, speaker out jacks. On off bypass switch. 11 ON LED, 12 VDC or 110 VAC with optional AC adapter, MFJ-1312, 9,95. 3x4xt inch aluminum cabinet. or Commodore 64. 1 Wx4Vi inches. 12-15 VOC or 110 VAC with optional adapter, MFJ-1312, 9.95. Use...

Queen City

The Clarksville Amateur Transmitting Society m be operating a special-event station celebrating the 200th anniversary of Clarksvlhe TN. the Queen City on the Cumberland River. Tfte dates and times are as follows October 13, t984, from 14002 to 24002 and October 14, 19B4. from 16002 to 2200Z, The call of this station will be N4GMT. Modes of operation will be SSB, CW, and RTTY. Frequencies of operation wilt be around 21.375 MHz, 14.280 MHz, and 7.240 MHz, A commemorative QSl certificate will be...

Sssb

Is up to 95 shorter than whip antennas yet it gives you better radio communication and perfect tuning Low profile Untenna eliminates vehicle clearance problems Says goodbye to inter-mod exclusive narrow band width lunes out adjacent channel interference. Cives a perfect match anywhere on the band. Eliminates mobile flutter by its rigid consfruction. Offers a wide choice of models standard and customized. Untenna is unequalled for mobile, portable, or fixed radios. 25 I m son St. Buffalo, N.Y....

Super Rtty Filter

Automatic tracking copies drifting signal. Ejcar 2206 sine generator gives phase continuous AFSK tones, Standard 2125 Hi mark and 2295 2975 Hz space. Microphone fine AFSK out. AFSK ground, PTT out and PIT ground. FSK keying output. Plus and minus CW keying. CW transmit LED. External CW key jack. Kantronics compatible socket Exclusive general purpose socket allows interfacing to nearly any personal computer with most appropriate software, Available TTL lines RTTY demod out, CW demod out CW-1D...

Chicago Il

The 3rd annual CCRL Manifest will be held on Sunday, October 21,19& 4, from 7 00 am to 2 00 pm, at American Legion Post ff21, 6040 N. Clark Street. Chicago IL 60660. Admission is 1.00 m advance and 1.50 at the door. Tables are 2.00 each. Talk-in on U5.Q30 simplex. For more information, write Norman Geuder KA9EZA, 6345 N, Magnolia, Apt. M, Chicago IL 80660, John Ibes KA9FUIr 2934 N, Mobile, Chicago IL 60634, or Frank Bonneil WB90HN, 1674 Wr Hollywood. Chicago IL 80660.

Engineering Consulting

CA 92621 (714) 671-2009 _ The Model 335A will deliver 35 watts of power using the latest state-of-the-art circuitry. The amplifier will operate SSB or FM and is compatible with most handhefd transceivers, including the TR2400, TR2500. IC-2ATt Yaesu, Santec, and Ten-Tec Only 300 mw input will deliver 5 watts out 3 watts in will deliver 35 watts out. Maximum input drive level is 5 watts. Our products are backed by prompt factory service and techmcal assistance, lo become...

Worked Trumbull County Awards

The Warren (Ohio) Amateur Radio Association. Inc.h announces its Worked Trumbull County fWTC)1 Worked Trumbull County Mobile (WTC-M), and Worked Trumbull County YL WTC-YL) awards. These programs are designed to promote increased amateur-radio activity among and with Trumbull County amateur-radio operators. The awards also reward operating achievements. Application Send applications and all correspondence to Don Lovett K3BXT, Awards Chairman, WARA, PO Box 809. Warren OH. One dollar musl...

Mount Carmel Rtty Repeater

The newest addition to the chain of repeaters in Israel. W4FQMS4X RPT, was activated In the spring. Located on ML Carmel overlooking the Mediterranean Sea from a heigni of 350 meters, this repeater 'S a unique phenomenon in our region presenting the amaieurs with almost endless possibilities for use. It was built shipped over, set up, and donated to the tstael Anv ateur Rad-o Club by Ed Webb W4FQM It is a near duplicate of a machine built and operated by Ed m Florida, and the hams here are just...

Yrd Comes Home

On March 24, 1984, Roger de Weaver 9Y4RD returned home for a well-deserved three-week vacation. Many of the DXers out there will be familiar with Roger's call-sign, which has popped up in the past two years from such good DX locations as SU and ST , and Ihey may have received his attractive and amusing QSL, At the monthly general meeting of the TTARS held on April 2nd, Roger was our guest of honor and addressed us for about one hour on his experiences in the Middle East. I was also privileged...

Hamtronics Outdoor Scanner Antenna

Harntromcs. (no., a manufacturer of low-no se receiving equipmenl for ama teur radio. has announced a new antenna for scanner and rncmitor buffs to serve a need for a scanner antenna which is half way between a bunt in whip on a scanner and a arge outdoor antenna requiring root mounting with some sod of mast ar rangement. Hamtronics has designed a compact Power Antenna' wnich may ty msta ed easily on th- side a house Outside a window, m an attic etc . A-ihout any special rnasl or brackets...

Doctor Dx From

It was Saturday momlng, and the CO WW X Contest was In full swing. As my wife walked past the shack, she voiced her familiar Are you going to be on that radio all weekend complaint. Moments later she remembered thai I didn't have an antenna up Obviously something strange was going on. for the sound of a raging contest was pouring out of the station speaker even though the hg was turned offt I've been blessed with an understanding mate, I explained that, yes, I would be contesting all day...

Island Dx Award

The IDX Award, sponsored by the Whid-bey island DX Club, Is one of the most sought after awards in the DX community This award is available to licensed ama teurs and shortwave listeners worldwide. The IDX Award is issued for SSBt CW, RTTY. SSTV, and mixed mode, as well as for mixed- and single-band accomplishments. Applicants must work fifty (50) IDX islands lor the basic award. Endorsements are given in increments of 50 islands, up to and Including the maximum number of islands possible. Only...

Magicm Rf Speech Processors

Add 15 dB of averegr output with genuine if clipping m your transmitter's i stage. Custom engineered for Kenwood TS-t 0, TS 130 TS-430 TS 520. TS-530, TS-B2Q Drake T-4X. TR-7 Yaesu F1-I02. Extent speech quality simple Installation, af tamable prices' SASE fo* data anil cost Magicom PO Bo 6552A Bellevue WA 007 BN810- REPAIR iiignmern caimrat on Collins written estimates. 25, nonCollins, 50 KlMAN. ,207h-49S2215 BNB-17 need someone to adjuGi a Mite teletypewriter. will pay all repair costs and...

Ceramic Filters

12.6KC Bandpass Filter 3dB bandwidth 1.6KHZ from 11.8 13.4KHz 455KHz+-2KHz bandwidth 4-7 at 3dB 455KIIz-f IKHz bandwidth 6dB min 12KHZ, 60dB inax 36KHz 455KHZ 455KHZ 455KHz + 5y5KHz at 3dB , +-SKBz at 6dB r 4-16KIIz at 50dB 455KHz 7KBz at 3dB , 4-10KHz at 6dB f +-20KHZ at 50dB 455KHZ +-5.5K3I2 at 3dB , +-3KHz at 6dB , -f-16KHz at 60dB 455KIJZ 4 2 KHz bandwidth +-15XHz at 6dB, +-30KHZ at 4 0dB 455KHz +-2KHz bandwidth 4-12,5KHz at 6dB , +-24KHZ at 40dB 455KHZ -I lKHz bandwidth 4-4-SKHz at 6dB , 4...

Hews From Cyprus

Summenirne tn Cyprus usually means, for locaf radio amateurs, fewer voices on the air. Most amateurs over here enjoy Ihe sea or the mountains during their summer A assort and Pauto Roberto near the finish hne tn Pant Squaret Rio de Janeiro A assort and Pauto Roberto near the finish hne tn Pant Squaret Rio de Janeiro holidays and the HF rigs are set aside. However, the VHF rigs are used quite a lot from the holiday or portabfe locations. Most of the contacts are between local hams, but some DX...

Model Ap

Designed for APARTMENTS MOTELS VACATIONS Quick Simple installation Operates on 2,6,10,15,20,30 and 40 rnetef5 All coils supplied Only 22-1 2 inches long. Weighs less than 2 lbs Supplied with 10 ft RG 58 coax and counter poise. Whip extends to 57 inches, Handles up to 300 watts. VSWR-1.1 1 when tuned Wrtfe tor rrpore ctei on arid cfly* BA W cjioouA Quality Communication Prochxrts Sine 1932 At you Distributors wnte or call Carol Street, ns ai PA 9007 the wire. Attach about 30 feet of nylon cord...

Computer Corner

This month Madison Etedronlcs Supply has two package specials for those of you that are interested in getting Into me world of RTTY I AviTGR. Both of these packages include full function Morse, Baudot. ASC I and AMTOR rr oae of operation Package 1 includes a self-contained unit thai plugs directly into your Commodore 64 and a spectrum analyzer type tuntng indicator that is as good as a scope for tuning AEA MP-64 2 TU & Soitwear retail 239.95 AEA TI-1 tuning indicator retail 119,95 AEA A01...

Philippines

Afmazan WAGLOS DU2 7 0098 Knight Drive San Diego CA 92126 In my iast column I wrote about the amateur-radio scene in the Philippines today. After a rather nice lengthy QSO with a W7 ham from Seal tie. Washington, who happened to be in he Philippines before World War II, he not only told me how they used to DX on 40 meters with RCA s CW rigs, and Arc-50 receivers coupled to high zepp antennas, he also sparked my curiosity about the history of amateur radio in the Philippines After taEking...

Method Of Mounting Cross Booms Use Washers On Both Side Of Bolts Tq Prevent Damage To Wooden Mast And Booms

BA1 ANCEP FEED AND FH SlNG .INR HEfiE. SOLDER TO L UGS FOR GOOD ELECTRICA CONNECTION- boom about ten times at each hole. A dab of epoxy glue covers the wire and fishing line. Attach the phasing line between the two feedpoints. 1 use twinlead sixteen inches long. The main feediine is also 300-0hm twinlead and is connected to either element. The feediine is then taped to the wooden center support. See Fig. 4. Electrical tape is used to secure the phasing line also Standoff...

Wantedmilitary Surplus Radios

We need Collins Sisl . 548U t v 426U2. UHF719A 6ieT ARC 91 ARC 102 RT-712 ARC 105. ARC tt4. ARC-115, ARC 116 RTS 3fARGl3l fM622 W.Icoj 807A or RT-857'AflC 13J. ARC 159 ot FiTM6dAHCH6-i ARC-174 NT I299'ARC 186 AP gt 7 APN 171 MRC-98 7I3F1 2 HF 105 Cohins antenna couplers 490T t 1 amp 0T 2, i90T9 CU-165 amp A ARC CU t669. GRC. CU 1402'ARC 490B-1. CU 1239'ARC 105. Top doUir paid or trade to new ama leur gear Write or phone Bill Slop. Slop Electronics Company, Highway Otto NC 8703 704 7519. 8NB204...

Tips On Chips

A good way to learn digital electronics is to learn about the various lypes of digital integrated circuits an the market. Every manufacturer of integrated circuits publishes spec sheets and data books describing ihe r product line. These publications, which are usually available at modest cost, contain a great deal of use ful information. One reference which I use often is the National Semiconductor Databook. This publication lists many types of digital logic circuits ranging from simple NAND...

Cushcraft Satellite Antenna System

Cushcratt has Introduced a new complete amateur satellite antenna system featuring two high-gain, circularly-polar Ized yagi antennas, The 70-cm, 16-element uplink and 2- lt neter, 20-element downlink antennas are fixed to a common mounting Doom. The entire array is lightweight with reasonable dimensions for quick installation. For more information, contaci Cush craft Corporation PO Box 4680 Manches ter NH 03103 603 627 7677 telex 953050 Cushsig Man, Reader Service number 480, The IC-27H...

Atj

lifib PoHvei H T Amplifier A Mode Operation with R fretmp C 012 VA Meter Dual Purpose Amplifier 10 Watts In 120 Watts Out 2 Waris In 40 Watts Our 3012 1 Meter Amplifier 30 Warth In 120 Watts Out 2 Watts In 40 Warn Out All Mode Operativ FM,SSE,CW.- TV Optional N1 Type ortnectora DI010 4.10-450 MHx Dual Purpose Amplifier LO Watr n tOO Waits Out 2 Waits In Warts Out All Mode Operation FM SSBrCW.ATV Optional N Type Oc iwttors D3010 430-450 MHz Amplifier 30 Watts In 100 Watts, Out All M ic...

Antuner And Hamantuner

L Industries has introduced Antuner, an automatic antenna luner with no moving parts. Anluner covers a wide spectrum af frequencies from .1 MHz to 100 MHz. An Cushcratfs new amateur satellite antenna system Cushcratfs new amateur satellite antenna system Tne ACT-1 Power Antenna 15 a broad band winp antenna with a iow iotse pre ampiiher m us base Although much smaller than a fulhsize outdoor antenna 125 inches tall , it provides good coverage ot distant signals and is capable of outperforming...

Practical Wireless

1 will now digress sornewhai from the g rerai type of news and information that makes up the Outk of this column. This is because I have iust come into possession of three books recently published in the UK of which I wo are directly related to amateur radio arid ihe third of which will be useful in mosi shacks. All three books are reprints of a number of arilcles originally published in Practical Wireless, ihe monthly UK publication dealing with all aspects ot radio tand not necessarily of...

Conductor

Omega Noise Bridge

osep t I Or K4IPV 5440 So. 8th Road Arlington VA gt 2204 Maximize your system's performance with this easy-to-construct noise bridge. Its just what the doctor ordered The antenna noise bridge is an instrument which most amateur-radio enthusiasts have seen advertised but only a tew know how to use. Several different models arc offered by Palomar, Omega-1 and Ml- see photos When used with a receiver preferably a general-coverage shortwave receiver , the noise bridge makes it easy to wring out...