Radio Amateur 08-1982

Satellite Products Division

Inside Ca. 800 352-2553 Outside CA. 800 421-2533 Boman Industries offers complete Satellite Television Systems designed specifically for - installation by the purchaser. You will receive broadcasts from Geostationary satellite with your choice of 3 DIFFERENT Fiberglas -Parabolic Antennas 9,lO, 11 ft. The elec tronics are the latest in Satellite TV eauip ment utilizing state-of-the-art component and circuit design. A fully illustrated instruc tion booklet is supplied with each system t ' explain...

Amateur Microwave Downconverter

K i 1 INCLUDING SHAPING UJ.R.5J A*0 MASTERCARD ACCEPTER W- uli 5> 5TEV C*rs TUP.E5 z.I Chi id Lh PREAMPLIFIER 2ft- dB CAIN 2. S dB NF OLfiPUT TUNfcS TV CHAwMELS 2 TO ft OUTPUT tMPEDANCE OH 0HV5, FULL TEAR W- uli 5> 5TEV C*rs TUP.E5 z.I Chi id Lh PREAMPLIFIER 2ft- dB CAIN 2. S dB NF OLfiPUT TUNfcS TV CHAwMELS 2 TO ft OUTPUT tMPEDANCE OH 0HV5, FULL TEAR CALL (804)489-2156 ELECTRONIC HOBBY INNOVATIONS 75 10 GRANBY STREET SUITE ZOT NORFOLK . VTRGINFA 3505 Fig. 6....

Porta Peater

FFuily tested, programmed, assembled 302 W S ENGINEERING P.O. BOX 58 gt PINE HILL, N.J. 08021 V 3A 0 MASTERCARD lor sarno day shipment For 569,95 you get the most efficient, dependable, fully guaranteed 35W 2 meter amp kit for your handy talkie money can buy. Now you can save your batteries by operating your HLT. on low power and still get out tike a mobile rig. The model 335A produces 35 watts out with an input of 3 watts, and 15 watts out with only 1 watt in. Compatible with IC-2AT. TR-24Q0....

Dentron Radio Co

CM U TUNED INPUT ACCESSORY Tuned input accessory for amateur band amplifiers which have no tuned Input stage. Tfie circuitry Is symmetrical on all bands No tuning necessary, 4 w x 2VH x MLX Mini Transceiver 25 Watt PEP SSB'CW Transceiver for any one Amateur Bond, 16Q to 6 Meters. Digital Readout, 12 Volt Operation, NJ-CAD Portapack available, 5 W x 2Y H x 7 D 4 lbs, GLA IOOOB Linear Amplifier 80-15m w.some MAftS. 1200w PEP SSB. 700w CW (4) D-50AS w tuned input tor Solid-State figs I25w drive U7...

Single Balanced

Fig. 1 a L Block diagram of the Cheap Trick receiver. Fig. Ifb . First stage of the receiver downconverter, including balanced mixer and local oscillator, tor uses circuitry similar to that found in most television sets, This month, we'll delve into the power supply and clever downconverter design and save the baseband circuits for next month. It should be remembered that this project is labor-intensive. If you just want to watch satellite television, then you really should buy a receiver...

Hameg Hm Oscilloscope

The Hameg HM203 oscilloscope is much like ham radio both are international phenomena. The HM203, a newcomer to the US market, features a rugged yet precise feel that one would expect of a piece of gear designed and originally manufactured in West Germany, The outstanding performance price ratio reminds you of similar gear from the Far East, And not to be neglected is the facl lhat the HM203 is manufactured and serviced right here in the United States. Oscilloscopes can be incredibly useful test...

Silicon Systems Dtmf Decoder

Anyone who has tried to tame a dual-tone frequency DTMF decoder using the ubiquitous 567 fC has probably thought that touchtone control probably isn't worth the hassle. The 567 decoder, although versatile, is far from ideat for decoding DTMF signals that have a variety of levels of distortion and volume. The 567 can give false Outputs if input levels aren't carefully controlled, and frequency stability is only as good as the timing network. In short, getting a 567-based decoder working reliably...

Poor MaiVs Spectrum Analyzer

Perkins WBSiPM Box 13642 Arlington JX 7601 i Hams enjoy making all types of electrical measurements In fact, it's one of our favorite pastimes and topics of conversation Fortunately, good, low-cost osc il lose opes, DVMsh and other instruments are available to us for measuring voltage, current, power, swr( frequency, and SO on, I here is one instrument, however, that has been beyond the reach of most of our budgets the spectrum analyzer Commercial versions of this useful rf instrument...

Amateur Radio Communication At Its Finest

SIMPLE DIRECT CONNECTION to your Transceiver. COMPLETE SYSTEM, built-in Demodulator & AFSK Modulator with keyboard programmable tone pairs. SPLIT-SCREEN operation with keyboard selectable line location. * LARGE, TYPE AHEAD text buffer, TEN, programmable message memories, plus ID's WRCJ & SELCALs, * RANDOM CODE generator & hand key Input for practice. * Baudot 60 to 132 WPM, ASCII 110 & 300 baud. SYNC-LOCK MODE for improved ASCII operation. * RECORDER INTERFACE FOR BRAG-TAPE or...

Otsego Street North Hollywood California

I mmmaiMMMMMMl ' ' Tran5rtlits Periett CodQ * Bullt-ln IS Jp 1 yfcjfey PR character buffer * Interna speaker and side. S PnKjsJT m fcl* tofie * Reed relay output eliminates keying h Mi, i 1 problems - Ail solid state circuits and sockets 1 for reliability - Speed range 5 45WPVI Perfect J companion to our CODE'fc'STAR all-mode code MOR5E-A-KEVER KIT, model MAK-K, Complete kit of parts & manual 5159.95 MORSE-A-KEYER, madef MAK-F, Factory wired A tested S199.95 MORSE A-KEVEfl ESSENTIAL PARTS KiT....

Magazine Fstv Uhf Contest

Over 750 worth of prizes will be awarded in the 1982 A5 Magazine North American FSTV UHF Contest. This 48-hour A TV contest is designed for the UHF specialized communications operator to work as many FSTV contacts as possible with rewarding bonus multipliers and additions for quafity picture transmissions, DX distance accomplishments, and bands utilized. All ATV stations in the United States. Canada, and Mexico are eligible for entry. Even stations without transmit capability can participate...

Mt Pleasant Ia

The Mount Pleasant Amateur Radio Club wiif be operating a station at the Midwest Old Threshers Reunion in Mount Pleasant. Iowa, September 2-6, 1982. Using club call W0MME, they wift be operating in the General portion of 80,40, and 20 meters. Amateurs from the Mount Pleasant area wit afso be handling emergency communications on the grounds and will be providing talk-in on 147.99 .39 (WGMMBR) and 146.52 simplex for those attending. Several hundred amateurs are among the 250.000 people annually...

Astron Rsa Power Supply

The RS-7A is one of a series of 13.8-V-dc supplies with ratings ranging from 4 to 35 Amps. The 7A is good for 5 Amps continuous or 7 Amps at 50 duty cycle, I paid 64,95 for mine. Ripple is spec'd at 5 mV peak- to-peak, full load and minimum fine voltage. Load regulation is 50 mV. This is what would be expected from an industrial power supply, but it's much better than many of the supplies built for amateur service. A look at the schematic and the construction explains the performance. The...

Ft I B

Had at a lower level, (Many transmitters develop ale voltage when grid current is drawn, at which point distortion is already occurring,) With R18 at the ground end, ale will be developed as soon as there is rf input. R14 determines the amount of voltage output. Increasing R18 towards +V permits a higher rf level before ale starts to develop, CR2 keeps any positive voltage from reaching the ale line. Both the circuits of Fig, 6 and 7 can be connected to 1C2 simultaneously without any...

Innovators In Digital Communications

Eltib WA2FPT RD 1, Box 106A Ulster Park NV 12437 Confessions of a Counter Evolution r Editor's Note The LSI Compute er Systems LS7030 counter chip used in this project is available Irom Belco Electronics, 43 South 49th Ave., Bell wood tL 60104, tor S12J5 plus shipping, Next month well bring you the conclusion of WA2FPT S discussion, As many of you may have done already, I had vowed never again to be lured into reading another frequency counter article, one more of those ubiquitous counter...