Radio Amateur 10-1982

Cra Antenna From Comrad Industries

Ddr Antenna

Your first impression will be What is it The second may be fHow does it work 1' or Hey, that's sure different wonder what it's for My neighbors thought I had left a fancy dish on the top of the car, and my wife remarked that it looked like a flying saucer whatever they look like . To me, it looks like a directional discontinuity ring radiator, or DDRR., .which is exactly what it is, Okay, I guess I do owe you an explanation about the mystery, so let's take first things first. A few months ago...

Cushcraft R Half Wave Vertical

We all remember the old cliches about vertical antennas, but the problem is that most of them weren't true, I've used vertical antennas with good success over the years and have owned most of the brands on the market at one time or another. Oh sure, if you insisted on ground mounting your vertical, refused to place it in the clear, and just drove any old kind of ground rod into the soii instead of furnishing decent radials, you were disappointed, ,, and have only yourself to blame. On the other...

Hustler Antennas

Hustler 3754

If six-meter operation is your dish, you will be interested in three new antennas recently introduced by Hustler. Inc. The 6-M83 three-element yagi features a 6-dB forward gain while maintaining a front-to-back ratio of 28 dB. Bandwidth for a vswr of less than 2 1 is 2 MHz, and at resonance centered on 50.1 MHz, the vswr is under 1.2 1. The suggested retail price is 69.95. Model G-3754 is a vertical, endfed collinear, omnidirectional antenna for fixed station use, and is ideal for repeater...

Amateur Radio Communication At Its Finest

SIMPLE DIRECT CONNECTION to your Transceiver. COMPLETE SYSTEM, built-in Demodulator amp 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 lD s WRG S SELCALs, RANDOM CODE generator amp hand key input for practice, Baudot 60 to 132 WPM. ASCII 110 amp 300 baud. SYNC-LOCK MODE for improved ASCII operation. RECORDER INTERFACE FOR BRAG-TAPE or recording off...

Jamboreeontheair

Starts 0001 GMT October 16 Ends 2400 GMT October 17 It's Jamboree time again Time for Scouts, forme* Scouts, and anyone interested. to meet on the air for a weekend of good Scout talk. It gives amateurs and Scouts worldwide a chance to iisien toor talk with other Scouts. In some cases, GARTG Worldwide SSTV Contest (Part 2) Side Winders on Two Open QSO Party (Pah 2) Maryland-District of Columbia QSO Party 73 Magazine 40-Meter World SSB Championship 71 Magazine BO-Mater World SSB Championship 73...

Telex Communications

,'See L-st Qt AaverifSt-rs on cage 130 Paul Svvejringen VV9 1 R R. T. Box 485 Sen On li 62811 Antenna tuners can be designed to match a wide range of feed line impedances to the lov -output impedance of the t picai amateur transmitter Many of the current, commercial- ly-made tuners can be used tor coaxial feediines or for the high-impedance open-wire feedtines. This f lexibility of use is not without its price, however, as the high-impedance capability re quires the use of wide-spaced,...

Wnitoring Times

Take charge of your scanner or short wave receiver. Learn where to look and when to listen with help from MONITORING TIMES, the only broad-spectrum publication written for serious listeners. There s an adventure woiting at your fingertips. Tune in drug smuggling communications, spy networks Space Shuttle support broadcasts military and govern ment aiMo-ground TadiaH piraTe and clandestine transmissions, ship-to shore Jinks-and much, much more. There s an adventure woiting at your fingertips....

Rx Noise Bridge

01X2 2 gang broadcast receiver-type capacitors. 600 pF per gang C3t 04 500-pF ceramic or mica transmitting capacitors high voltage G5T 06 ,005-uF. 200-V disc R1 39k, Yz W R2 4.7k, Va W R3 25k pot L 15-uh variable inductor D1 1N34A germanium diode Ml 0-1 mittiammeter 51 DPDT ceramic wafer switch, two section 52 DP4 position ceramic wafer switch, two section 53 SP multiple position, to match number ot connections required

The Non Dxpedition

Some 700 DXers who worked KFIO portable on CEOX on San Felix island (off Chile) were somewhat upset recently when the League discredited the operation. One of the DX bulletins had further details, ft was reported that the Chilean government had claimed the documents as forgeries. The Chilean club was up in arms about the whoie situation. A day or so later I received a letter mailed from Greece from Bob Read KFIO with copies of some CEOX documents but no explanation. These papers were copies of...

Us Distributor Dealer Inquiries Invited

Credit card holders may use our toll free ordering number a little antenna that can Cm I ton Mo ln W4YVY 1612 Colon> Drjv*' Jarboro NC 27836 The Campbell Soup can antenna is 1 variation of the familiar I antenna Four advantages of the soup can antenna are (1) its unique construction uses many parts from around the house. 2) it can come apart for portable operation and storage, (3) the matching section is unbalanced to match coaxial feedlines. and (4 the matching section has tmmunitv to...

Dual Drive Tribanders

20, 15 and 10 meters Wideband, Low SWR. No tuner needed Exclusive phased dual drive gives higher gain Exclusive coaxial capacitors have lower tosses, higher Q Transmitter power is radiated not lost in the traps Full power low loss balun. Gives improved beam pattern TET Antenna Systems presents three full size trap multiband beams to meet every amateur ne d 5 element, 4 element and 3 element models all with the exclusive TET dual pnasec drive This famous drive system originated with H89CV and...

Order Blank

HUDSON N H 03051 TEL 1603 863-5005 Henry C Etwell, lr N4UH Rte 2, Box 20C Cleveland NC 2701 i AR. Taylor WSOS had a very interesting article in the February, 1981, issue of 73 titled Stalking the Elusive Ground Fault. He went through anxiety trying to correct the situation What was the situation Simpiyr he had extrahigh voltage on one side of his three-wire 240-volt system and ver low voltage under load on the other side. The high-voltage side burned out his fluorescent light (in...

Fma Audio Subcarrier Generator

w * m S r r -m s- t t i- V- v i P Puts audio on with your camera video jusl as b oad i J5t TV (JopS al 4 flflHi Puts qui up CO 1 m p-p lodrm* Ib TX A.5 or VM-2, 3. or 4 odufatoii Requires low Z mic (150 o t 00 ohmsl. and 1 Jvdc ma W ks with any k.n-. i S rflH video bandwidth. TXA5-4 ATV EXCITERfMODULATOR.SBQ ppd Th is wired and itsied module ie. designed to ckr a tne Motorola WHW-710 rfltidulc In he PA5 10 wall linear am The r-y51a n the 100 rtiM ogion keeps har-Tim flics Oul Of in a meters...

Grove Scanverter

Grove Cvr Scanverter

RTTV interface for the TRS-SO color computer by Ridge Systems, RTTV interface for the TRS-SO color computer by Ridge Systems, announced the model 4511 RTTY interface for the TRS-80 color computer, The interface plugs mto the Program PakTW slot and contains ail the software and hardware in a ROM cartridge. The five pin DIN plug on the back of the cartridge provides the EIA signal connections to your terminal unit. Operating features include keyboard control of the message and operating buffers,...

The Test Equipment Library

VOL II AUDIO FREQUENCY TESTERS Jam packed with ai> kinds of audio frequency test equipment If you're into S5Br RTTY, SSTV. etc this book is amust for you. a good book for hi-fi addicts and experimenters, toe' LB7360 S4 95T VOL II RADIO FREQUENCY TESTERS Rad-o frequency wavei. 'he comm denominate* of amateur radio. Such (ems as SWR, jntenna Impedance, iine impedance, RF output, an fitrid strength detailedinslrucHons on testing mese Mems include sections on signal gen erato.r3, rystal...

Compare These Features With Any Unit At Any Price

LEO readout displays power selection when transmitting. DIGITAL S RF METER LEDs Indicate signal strengih and power output. No more mechanical meter movements to fail apart LARGE ' -INCH LED DISPLAY Easy-to-read frequency display minimizes eyes-off-the-road' time. PUSHBUTTON FREQUENCY CONTROL FROM MIC OR FRONT PANEL Any frequency may tie selected fry pressing a microphone or front-panel switch, SUPERIOR RECEIVER SENSITIVITY 0.28 uV for 20 dB quieting. The squelch...

The Old

With my 60th birthday coming Lip September 3rd, I find myself retrospect ing .and wondering how much time is left. I can't compiain, for Ive enjoyed putting out 73 Magazine for the last 22 years and I've had the excitement o being there when many of the interesting things hap pened. Back when II first got into amateur radio. I used to go to the hamfests and be amazed a Ted McEiroy and his ability to copy high-speed code. What a show he put oni He'd tune in some code at around 50 wpm and talk...

Rechargeable

ELPOWTft I EWO SOLIO L CEU 5 1 2 t V TUT SLIPM CHftSSIS-TW NOOEL J CMOS 3 SECTIOJ. LEN& TH 22 CLOSED. > L3S, EXT r lOOcips Ten S1 00 jft 500 hp* Tor 50 00 fj signaf repfoducicon Single signs rec p- -Removes an QRM and GRN 'Digs ou CW signal, decodes ii virr Phasso Loch Loop Tone Decoder then reproduces it witn full operator control over Gain Frect Tone, Delay 'All controls on front panel * Freq control variable 30U Hi lo 5500 Hi will match any ng + LED flaahaa during decoder operation...

Heritage Holidays

The Coosa Valley Amateur Rad o Club will operate from. Rome GA fTom 120QZ October 9 to 22002 October 17 to commemorate Heritage Holidays. 25 khz on the lower side of the G netaM 9ass phone band 60 through 20 meters Special certif cate tor a large SASE Wagon Train mobile on Oci 16 Endorsement to CVARC. Bo 183. Rome GA3016 We are happy to Qrovidp Ham H ip listings tree, on a space-arar'abte tiasfs. We are not happy we to rah , rime from otrter autt amp s to aedpfj amp r crypfrc notes scrawled...

Applied Invention

H SOURCE Fin kjliq tatl s'a rt Jf I c Ami M R u,ind Vflfy Hw nui IKKT M ulV l vh H R-F3T UT Milf M 1 Inl'M (t lrfW) 0 -ttMi S11 Q9 MCJ l-si B aiiAilAM-i I.D 0 fl 550 i U 3 l I D iflftil ft 4I K-m ' 103 SkJAftftNTFf I Q RM -f H .' .'. i . 0 WW 1901 tt- MOM OMCWE Hwuu (II irWKr 13 feta FET QttAun FOintDi - JJ. - FO 12 tfl * I' 170 lie JO f rqi i3 5fl Fflypiui , khf -- - - jh- - Mi tTM vfk 2 Ortp i qr I CHi Sjlfftlt TVHQ FD-mi jKf 00 pi* V iLId 10 i b h ufRiM Ptarge Hi 00 Wratuln' niin ri nFca iy...

Splat Tqmeter

Ca bfjf on us ng fhe 7 75-V, 60-Hz Jine. Fig, 4. Ca bfjf on us ng fhe 7 75-V, 60-Hz Jine. is blank, of course the original scale would show through paper glued to the front of the faceplate. To make the scale, draw an arc on the new meter face, replace the faceplate and connect the meter to a variable power supply through a resistor sized to make 8.5 volts read full scale With a VmA meter, that resistor should be just under 8,5k, The schematic shows a 10k resistor in parallel with a...

Souid Plan E

Short Backfire Dipole

An open canity two wavelengths m diameter and one-q u arter wavi gt I en gth deep I dii I led a hole pal-tern in the cavity center to allow experimentation with different feeds or rotating the reed polarization. The radiation pattern is symmetric with a halt-angle re sponse ot 30 degrees to the 10 dB level. The dipole feed is formed Irom two concentric piet es of thin-wall brass tubing that comes in telescoping sizes at a lot at hob-b shop The outer lt onduc-tor has an internal tliameter of...

Call Toll Free

601-323-5869 in MS, outside continental USA. UE ENTERPRISES, PdPJ incorporated Box 494, Mississippi State, MS 39762 DON'T TUNE UP ON THE AIR USE A NOISE BRIDGE Complete parls kit including pre-drilled diecasi enclosure. Measures both resistance and reactance. Resistance limits 0-250 ohms Reactance limits 130 pF Frequency range l.SMHz-30 Self-contained, uses your receiver as detector Ladder Line Antenna Wire Antenna Traps Insulators SWL Antenna Portable Whip Antenna and much more Box 41 IS,...

General License

QSL CARDS 73 turns out a fantastic se'-es o* QSL cafds at atcut hail the cost jf having them do e etse where because they are run as a fill-in between printing books and other items n the 73 Print Shnp 250 Style W QW0250-for S8 95*. 500 Style W QW0600 for i 13 95*. 250 Style X QX025Q - for 95* 500 Style X QX05G0. 250 Style Y-QYQ25Q-for 8.95 500 Style V QY0500 or St3 95 ' Allow 6 2 wks for delivery * LIBRARY SHELF BOXES - These sturdy *mte. corrugated rfjn -esistani do i each hold a lun > a'...

Preamplifier

HAL PA19 WiDE BAND PRE AMPLIFIEHh 2 200 MH BANDWIDTH - .JdB PQINTSi 19 riti GAIN FULLY ASSEMBLED AND TESTED S 95 HAL PA 1 A WIRE BAND PHE AMPLIFIER Ifj MH TO 1 1 GHz T dB GAtjNI CLOCK KIT MAL 73 FOUR DIGIT SPECIAL 17,95. OP ERAT ES ON 12 VOL r AC (NOT SUPPLlFD) PROVISIONS FOR DC AND ALARM OPERATION COMPLETE KIT CONSISThNG OF 2 PC G 10 PRE ORILLED PC BOARDS 1 CLOCK CHEP6FNDCOMM CATH READOUTS 13 TRANS 3 CAPS 9 RESISTORS 5 DIODES 3 PUSHBUTTON SV fTCHE AND INSTRUCTIONS DON'T BE FOOLED BY PARTIAL...

Untold Wealth

Well, it looks as if I've struck again. The TYRO material in 73 can if you find yourself getting interested in it. lay the groundwork for getting into what is going to be a huge industry within a tew years. I'm referring to the coming direct television broadcasting from satellites Sometimes I get discouraged. On the one hand l get letters from readers ,vho thank me for getting them into new businesses such as home security, computers, and so ont telling me that I provided the impetus to get...

Palomar Swr And Power Meter

No matter how you look at it, Palomar Engineering's model M-827 swr and power meter is a unique product and the result of a unique idea so much so, in fact, that a patent has been applied for. What can be so different about an swr and power meter, you say WellT the display, for one thing , LEDs that show both swr and output power simultaneously. These are arranged in two side-by-side vertical columns on the front panel of the meter and light up when rf power and ac power, too, I must say is...

Trtty Video Cw

BOX 2952 GARLAND, TX 75041 (214) 840-2072 Yes indeed Just add a Matched Pair of top-qualify 2 1 KHz BW (tjandwtdth) Fox Tango Fillers Here are a few quotes from users . Makes a new tig oyf pf m g Id TS& 30S' ,p> ,, VBT now he I drvamed it should-. .Spociacufat improvement m SS8 seiectrvtty. Completely eliminates my need for * CW filter Simple installation excellent instructions The Foj Tango filters are notabl superior to both original 2.7KHz BW unrts but especially the modest ctramtc...

Silver Platters

For the past six months I have been reading a lot of letters from readers concerning the no-code licensing. Ourcountry is already burdened with give-away programs such as welfare. Now we have advocates of give-away amateur radio iicenses I don't work a lot of CW, but 1 am one of the few people in this country who believes you don't get something for nothing Do you get a medical or Jaw degree, or even a high school diploma without having to learn some things that you may never use No you don't,...

Ham Accessories

QAIWA HIGHLY MOBILE REMOTE MIKE SYSTEM T AUTOMATIC ANTENNA TUNER, 2 METER HT AMPLIFIER, CROSS NEEDLE POWER METER, AUDIO FILTER NYE VIKING- CW POWER IAMBIC KEYER t 3KW ANTENNA TUNER, HEAVY DUTY KEY SAVE AND 0< P UNAD1LLA REYCO - ANTENNA TRAP 1 FILTER TRAP VAN G RDEN ENG, - ANTENNA BAL UN MANY ANTENNAS, BOOKS, TUBES, ETC. RADIO ACTIVITY 531 West Collins Drive

ICOM Handheids

ICOM's reliable, field proven, handhelds have been the most popular handheld on the market. Here's a few reasons why THE TRANSCEIVERS. The IC-2AT futures full coverage of the 2 meter ham band. Tiie ' C-3AT covers 220 to 224.99 MHz, and the IC-4AT has 440 to 449.995 MHz. Each radio Is only 2 .6in x IA in x 6.5 in in size. Excellent audio quality is provided by a quality speaker and an elect ret condenser microphone. All iiave battery saving 0.15 watt low power. Tout it one pad is included S...

Philadelphia Resins Corp

20 Commerce Drive Montgomeryville, PA 18936 (215)855-6450 Telex 84-6342 DISTRIBUTORSHIPS AVAILABLE to qualified suppliers of amateur-radio equipment DISTRIBUTORSHIPS AVAILABLE to qualified suppliers of amateur-radio equipment W2IJB and K1MEM in front of one of the operating positions. Note the hill in the background blocking the path to Europe. W2IJB and K1MEM in front of one of the operating positions. Note the hill in the background blocking the path to Europe. Gabriella and the DXpedition...

Muutiband Antennas

The first time I saw the Spider antenna, I was intrigued with the unusual design and wondered why anyone would put something like that on a car, The location was San Diego, and the event was the ARRL Southwestern Division Convention and llHamputer fest. Fred Schmitka of Muitiband Antennas had a booth there, and he had several of these mobile antennas conveniently mounted at the booth which caused a lot of gawking and a lot of stopping to question Fred all about the whys and wherefores. I was...

Clocked Operat Cn

Fig. 6. fa) Two AND gates and a type-T ilip-flop combine to form a l*K flip-flop, (b) Several designations IMC T, or Cp) are used to indicate the clock input for a l-K flip-flop. (c) When both the presei and preclear inputs are HIGH, a f-K flipflop is in the clocked mode. The output depends on the status o the I and K inputs, (d) Direct control of the l-K flip-flop is ac( omplished by using the preset and preclear inputs. are no invalid or disallowed states in the clot ked mode (b) it can cause...

Comrad Industries Antennas

Com-Rad Industries has just announced the availability of two new antennas in its line of space-saving antennas for fixed and mobile amateur radio operators. The CR-1011A and CR-6A cover the amateur 10- and 6 meter bands, respectively. Each antenna is a full-sized quarter-wave vertical ground-plane that has been rearranged mechanically to be only 5 of its normal height. It consists of a basic helic element with an ad justable telescoping capacity hat tuning ring for resonating the antenna to...

More Features

Automatic incrementing serial number from 0 to 999 can be inserted into buffer or message memory for contests. Repeat function allows repetition of any message memory with 1 to 99 seconds delay Lets you call CO and repeat until answered Two key lockout operation prevents lost characters during typing speed bursts. Clock option (496 only) send time in CW, Bau dot, ASCIL 24 hour format. Set CW sending speed before or while sending. Tune switch with LED keys transmitter for tuning, Tune key...

Convenient Top Controls

- Optional MS-1 mobile or ST-2 AC charger supply for operation white charging. Battery status indicator. Complete with flexible antenna, 400 mAH Ni-Cd battery, and AC charger. ST-2 Base station power supply charger approx, 1 hr. . . . - _ - - - - VB-2530 2-M 25 W RF power amps., TR-2500 only , TU-1 ITogiia m ma hie CTCSS encoder TR-2500 only . TU 35ri IJrogramntabic CTCSS encoder Amounts inside TR-3500 only . PB-25H 1 eavy-duty 490 mAH Ni-Cd batterypack. BT 1 Battery case for A A m a nga i ic...

Henry Radio

. serving the electronics Industry for 54 years so far. 2050 South Bundy Drive, Los Angeles. CA 90025 Please send me more information on ARCO Solar Power Systems. Name _ Not all versions of the J-K will have the direct-mode inputs preset and clear . These inputs do, however, make it a more useful device. The preset input may also be called a direct-set input, and the preclear input called a direct-clear input. Direct mode operation. The operation of the J-K flip-flop in the direct mode is very...

Auto Scan Module And Battery Saver

15 minutes to install scan restarts when earner drops off busy switch controls automatic scan on-oM, includes module and instructions Model AS-1. 25.00 uj FT-207R BATTERY SAVER KIT MODEL BS 1 14.95 No more ac-jd batten due 10 memory backup '30' (ess po*er dram when squelched 'Simple io install step-by step msiructions and parts included mA memory backup reduced to 500 AA '45 mA receiver dram reduced to 50 rt> A 'Improved audio lidelity and loudness

With Data Sheet

NE57835 2SC2150 Microwave Transistor Ft Gain Bandwidth Product at Vce 8v, Ic 10ma. GHz 4 Min. 6 Typ. Vcbo 25v Vceo llv Vebo 3v Ic 50ma. Pt. 250mw UNIlLCO RF Power and Linear Airplifier Capacitors These are the famous capacitors used by all the RF Power and Linear Amplifier manufacturers, and described in the RF Data Book. 200pf 1 to 220pf 11 to 470pf 51 up 500pf lOOOpf

Satellite Qsl Bureau

One vastly under-utilized resource availabte to all amateur satel lite users is the AMSAT-OSCARQSL bureau. 11 works like most such bureaus Operators keep seif-addressed. stamped envelopes on file at the bureau and incoming cards are sorted and periodically mailed out in the envelopes. The only problem, according to bureau manager Bill Luebkemann WB2LCC, is that many satellite buffs aren't cur rently using the bureau, resulting in a large backlog of unclaimed cards. At midsummer for instance,...

Autoconnect

Enjoy super-gain, low VSWR, and FULL COVERAGE, 144 through 148 MHz, with less weight and windload, Dual-driven elements, balanced feed for a better match and clean pattern. CIRCULAR POLARIZED For the Phase 1MB satellite and terrestrial DX, ATV, and FM. Minimizes multipath and flutter fading. Rugged symmetrical construction. IDEAL for point-to-point and repeater control. Rear-mounted, vertically polariz ed, compact. Continuous coverage, 420-470 MHz, Direct coax feed suitable for most...

Plastic Washer

Method of securing the ends or the wire elements. A few inches should be left free for pruning should be precut to 8 feet b inches (some shortening will be needed to resonate them) The 15-and 10-meter elements are made ot No 8 soft aluminum ground wire and are spaced from the 20-meter main support on opposite sides, as shown u1 -ing 6-inch clamp-on TV standoff insulators Care must be taken to see that the wires do not come into contact with the 20-meter element, except of course at...

Frequency Sources Inc Model Ms X Microwave Signal Source

MS 74X Mechanically Tunable Frequency Range MHz 10630 to 11230 (10 63 To * 1 23GHz) Mmrmum Output Power (mW) 10. Overall Muinplier Ratio 108, Internal Crystal Osciliaior Frequency Range (MHz) 98 4 to 104 0, Maximum inpul Current (mA 400. The signal source are designed for applications where high siability and low noise are of prime concern these sources utilize lundamen i a J transistor osciiiaiors wiift high O coaxial cavities, followed by broadband siaoie step recovery diode multipliers This...

Communications

FM AM SW LW 4-Band Portable with PLL Tuning ID chtn r pie Ail luii.n j l N pu M Hu1 Ih < i EntlHTy bB.Ek i y ltin f.j pnt-icl ilsr.ini sn f lrnh 10 k g y I > I Jileen t Q Up dClft n tp,jai lu HQ wffP mil tiull& n OulfUrch i LEO lunmg ind mcr. PM Dynamit tpvflh Turn no IflC tuition tfciH U*gt HO U I2 *K iflE> Hifc M' l or * C bBl r-ii mal hl I-.rlinji am J A * mUfclt 'tir itwfTiwy lapMf tut tu AJB aitti J ', -' -ij- H4m r - rs 1 - 1 lij-tlitt r Jtilp W Typ Si trtKiMniii KMPuS iMMi ' j....

Pl Ast Ic Plumbing Pipe

Fyg. 3 al The overall construction of thelO-meter main support is shown. 7he tubing is slit and clamped together with hose clamps, Overall height assuming the base is 2 feet above ground level, is just over 33 feet nety was constructed and tested at W1GV 4 and was found to perform exceptionally welt. How does an antenna such as that shown in b , Ftg 1, work Actually, it can he thought of as simply a ground-plane antenna in which the set ot iradials is brought straight down from the feedpoint....

Amateur Microwave Antenna

M-21 SYSTEM FEATURES 55db System Gain 36 Parabolic Antenna Microwave Downconverter enclosed in aluminum die cast case SPECIAL PRICE S17996 T 1 SYSTEM FEATURES Over 35db System gam 22 Parabolic Anienna Microwave Downconverter enclosed in probe SPECIAL PRICE 129 95 M-21 & T 1 Systems come comp ele with Attractive Power Supply 50' RG-59 60 + Fori 3 RG-59 Jumper SRS has other microwave systems, kits, boards, and components available Complete Satellite receiving syslems from 2195.00. Send for...

Framingham Ma

The Framing ham Amateur Radio Association, Inc., wlfl hold Its 7th annual fi ll Ilea market on Sunday, October 31. 1902, at a new and larger location (diagonally across from Ihe previous location) at Ihe Framingham Civic League Sliding, 214 Concord Street (Route 126 , downtown Framincham MA. Doors will open at 1000 am but sellers may begin setting up at 8 X a - Adm& SiOT is S2 QG tables a.re S O.OO and pre-regisiratHon > BIT O BYTE < Eliminates or greatly reduces interference to TV...

Stony Brook Li Ny

The Radio Central Amateur Radio Club ,vt i hold as fourth annual HanvCenirai edition, n Sunday No-embef 23. 1982. m the main sooaJ nan of Tgrnpte Isaiah, Stony Brook Road. Stony Brook LJ NY abous 50 ir es east of New York City). Doors wilt open at 730 am (or set-ers and deaier and ul ei30 tor the gen era I public Admission is S2 0Q and XYLs ind children under 12 wHl be admitted Nine-toot Tables are S& 00 each and halt tables are S3.DQ Features will include an updated antenna ledture by Art 1...

Memphis Amateur Electronics

Authorized Dealer for Kenwood, Yaesu, Icom, Drake, Mirage, AEA, Info-Tech, Ten-Tec, MFJ, Cubic, and B& W. MON-FRI 9 00 5 00 SAT 9 00 12 00 Write 1465 Weils Stat Rd., Memphis, Tn. 38108 This service will be available nationally Lab tested & time proven modifications professionally installed in your amateur Handy-Talkie 2M, 220, 440. MH2 iranscetver by Henry Radios warranty technicians

High Performance Preselectors

* Ultimate rejection over 80 dB * Five large tieficaI resonators 600 kHz at 144 MHz - 3D dB -1.6 MHz at 220 MHz -40 dB 5 MHz at 450 MHz -45 dB * Tine solution to interference mtermod and tfesens problems on repeaters * Dimensions only 1.6 * 2.6 x 4 75 excluding connectors * Custom tuned to your frequency * Allow 2.00 lor shipping and handling We have a complete line ol iransmiiter and receiv er sirjjjs and synthesizers tor Amaleur and GGnr mercial use Write or ull for our free catalog

License Plate Holder

Tf you happen to live in one of those states where only a single license plate is required and you're a radio amateur to boot, Vani-Piate has something that you'll be Interested in a vanity plate holder and the plate to go with it You can dress up that bare front bumper with a personalized vanity plate showing your raised callsign in while or black on a variety of colored backgrounds, framed in a chrome bracket which sets it off attractively on your vehicle. The mounting plate is made of...

Rogo Cw Software

Over a year ago I read an advertisement in 73 for a Rogo Computer Products program that could run CW on a TRS-80 I was a lit tie skeptical, but at the price offered (519,95), I wouldn't lose too much if it turned out to be a lemon, i had previously tried several other products that dido1 work too well on the Model L Response lime was very fast I had the product back in less than a week. I received a tape with the program on one side and a message in Morse code at 30 wpm on side B, The...

Digital Code

The FCC is doing ham radio amateurs a great injustice by not replacing the Morse code with a more viable alternative and by being reluctant to introduce computer technology into ham radio. The Morse code, being a good base for communications, is at present outdated and not in step with our current technology. It remains for many a nostalgic foothold with the past a good feeiing of taking part in something that originated in past history. However, Morse code does not a true amateur make There...

Channel Master Earth Stations

A new feed assembly used in Channel Masters new generation Earth stations features a 120 or 100 LNA (low noise amplifier), scaler feed, and auto- is 48 inches in overall height and matic polarizer. The LNA offers is shunt-fed, providing optimum weather protection and reliabili- performance on FM, AM, or ty with a one-piece cast alumi- SSB. The antenna is supplied num housing that is coated with complete with stainless steel a weather-resistant urethane impact spring, V inch hole finish. In...

Vacations

Operates on 2,6, 10,15,20 and 40 meters, 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 11 1 when tuned Write for more details and other B& W products BARKER & WILLIAMSON INC. 10 CANAL STREET BARKER & WILLIAMSON INC. 10 CANAL STREET ORBIT is the Official Journal for the Radio Amateur satellite Corporation (AMSAT), P.O. Box 27,...

Satellite Earthstation Receiver System

Telecom Industries Corporation has just announced their new TX-2440 satellite Earth-station receiver system. The receiver incorporates several unique features, including a three-position audio-subcarrier bandwidth selector, and an LNA-mounted, dual-conversion downconverter patent pending) that enables any LNA to be converted to an LNC in seconds. The TX-2440 lists for 895. For additional information, contact tion, 27 Bonaventure Drivet San Jose CA 95134, Reader Service number 491. Kalgio s...

California Qso Party

Sponsored py the Northern California Contest Club,. with strong efforts being made to have all counties in California on for the contest duration. iS Ingle-opera tor stations may operate only 2A hours of the contest period off times must be clearly marked in the log. Multi-operator stations may operate tne full 30 hours. Stations may be worked only once per mode per band All contacts must be simplex. All CW contacts must be made in the CW subband California stations that change counties are...

Gartg Worldwide Sstv Contest Part

Starts 0600 GMT October 9 Ends 0600 GMT October 10 This is the second part of a two-parl contest the first weekend was in April but rules were received too late ior publication. The contesl is sponsored by the German Amateur Teleprinter Group (GARTG). A 6-hour nonoperating time must be taken at any time during the contest. Use 30-through 10-meter amateur bands, SSTV mode exclusively The same station can be worked only once per band. Operating categories include a) SSTV transmitting and re...

Novice License

NOVICE LICENSE STUDY GUIDE b, Thrnothy M. Daniel N3RK. Here ts me mos up lo ate no. ce guide available. li is complete with information about learning Morse Code, has the latest FCC amateur regulations and the current FCC application forms. This guide s not a guest i on answer memorization coLT'st buT raner it emphasizes the p.ract'cai side of getting a nam license and putting a .lai oncn tl -a r it reflects what ne FCC expects a Mov.ce to know without page after pa eof dull theory The mos...

Hand Books For Hamshack

THE COMPLETE SHORTWAVE USTENER'S HANDBOOK. 2nd EDITION by Hank Bennett and Harry L Helms. This comprehensive volume contains loads of now information from alt over ihe world on the latest developments in SWL technology clubs, associations, practices and sta ons A thorough guide to stations of (he world by general continental area and frequency fs mcluded 3K+2*i S9 THE TEN METER FM HANDBOOK-by Bob HeiI K9EID Thi s ri< jndboc fc has been pubiishec to etp the ten meter enthusiast earn more aboui...

For The Contester

THE CONTEST COOKBODK-fhis l ook reveals Ihe secrets of that elite group ol operators who top ihe list when the contest result .ire published. IL contains detailed suggestions for the ftrsUlme coniester as weil as Tips for the advanced operator Domestic. OX. and speciaity contests are ai discussed complete with pnotographs diagrams sno* ir,g the equipment and operating aids used by the top scorers For the senous coniester BK7308 5595

In Stock And Ready To Ship

Use ttie O'def card on Reader 5ervice page r itasn r pmrze .r Ofdef in a ser - - f pa r anr ma to 73 Radio Bookshop Pelerborough NH 03458 Be Sure TO include check or detailed credit catd information Mo C O D orders a ceL ref.i Add 1.50 handling charge fof Ihe first book Si 00 lor e u h additional I ot * Que* oris regarding your order' Please jviite ro Customer Kerne ar the a Do iddrev J . eeK ' r dei-v , FOR TOLL FREE ORDERING CALL 1-800*258-5473

Reasons Why Knowledgeable Amateur Radio Operators Choose

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 steel cable and no 'fish hook1' 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....

Receiver Features

Built in RF modulator Detent Tuning-3.7 to 42 GHz Variable Audfo-5.5 to 7.5 MHz Invert Video Channel Scan Voltage monitoring Meter output Remote Tuning SPECIFICATIONS Single Conversion Image Rejection Downconverter Threshold 8 db CNR F Bandwidth 24MHz Output IV Audio and Video IF Frequency 70MHz * Video Bandwtdth 4.5MHz Size 3WHxSy2MDxlWW Main Board Tuning Board * Dowr converter board Modulator Board Parts List, assembly and alignment manual 4GHz local oscillator and 70MHz filter is pre-wired...

Microwave Television

Thf stantterti RH iiownt o-nmNflr - -Qe shown iiQove gives ys i i proven convenor ciesjgn mounted in a wcathemgiii antenna in.ir h-aimes low wind loading c> nd imy inflation With litils pa ('.- are r.- . i-. i hourb oi Amaiaur ibIeyisiqti & ntcriBtnment Just htii the hi-'hh.v connet I one cable from tin aniens to me power -uopiy ano i second une irom the power supply to your ty andyouaraotiltaa t Ai dawncanve'ter use r. rostrip cofisrrm No-, foi long and r-eliabHr operation A iow vise...

Connectors Made Im

Double Wale Conrwctor H.79 PL 25 Double Female Connecloi 98c ' 'i pat ord w'RCA rvpe piugsea nen SISf QO Reducer UG 175 or 176 _ 10 1 99 UG 2 D u Ar phenol Type N Male 1 * Gr S3.00 BNC GB8C U. male 1.25 V 16'Hl h Mihe Pluq ror Collins etr Si.25 FREE CATALOG COD arid SI.50 FLA. Res. add 5 Sales la* Rotot Cable a con 2-18 y ,622ga i9eJft. Connectors shipping 10 add' , 2.50 minimum Cabse-shi fK SlOO ist tOOtl L 0C sac ''0 it 1327 NE 119th Street. Dept. RLOt No*...

Digital Display

F T'-r iiE 1 t- . r. . prti yl L Liz llflli nai smm to iffii, Amt jkhI Ui die* (Ht . *---. , r ff - t . 1 1 *r ' lit--. til . F T'-r iiE 1 t- . r. . prti yl L Liz llflli nai smm to iffii, Amt jkhI Ui die* (Ht . *---. , r ff - t . 1 1 *r ' lit--. - n.J a J I H. . . I - . I moijai it heath . i-. ffljw- ,+ioa,t I P. 11 .L1 I _ IDE je .iI.-Hjo t-> t 1J a I . I. (frnfl inii Cull nlU. J pljf - tr .i r , - i., r. - k i p Li In.f tj i r .-.L -tJ I i- f. - * < Kf it t Li i . f i J-IT * T t.-...

Quality Microwave Tv Systems

Complete System Rod Style as pictured) S12495 Complete System (Reflector Style as pictured 5149.95 Down Converter Assembled & Tested 64 05 Power Supply (T to tflvl 4945 6007 N. 61 st Ave. Glendale, A z. 86301 Space G .iiers no iv ble toi o* 1 1 u llr-b.ind oper ti1 idh from 3 L, 1 > 1 H MH 1635 WEST RIVER PARKWAY GRAND ISLAND, NEW YORK 14072 .

Birch Hill Sales

PO, Box 234 Peterborough, NH 03458 603J 924 7959 CaUtogSt- VOU COULD SHIP VOUtt RIG TO THE FACTORY FOR REPAIR. YOU COULD SH P IT TO RQ SERVICE CENTER FOR REPAIR. BUT YOU STAND A GOOD CHANCE OF FIXING IT YOUR* SELF WITH HELP FROM YOUR OWN COPY OF OWNER REPAIR OF RADIO EQUIPMENT THIS BOOK WILL BE SHIPPED POSTPAID FROM K6RQ FOR 8.95

Qualityeconomy

MONORAND YAGI BEAMS TRI BAND YAGI BEAMS CENTER INSULATORS BALUNS DUMMY LOADS - AND MORE1 AH OX produc s are fully guaranteed Send large S A S E for free catalog Dealer inquiries are welcome P.O. BO * 3 7 L oton IL ftl S40 I'Siooe O 346- 2 0 0 7 '20DQ JKCt Band tad* CDi ntrie.1 -SCVfK Midi Uorfcail Conf me C I m* entire Dl Cilfsign *trOU Designate tht Model n Bi-.d PLUS 'B ro 1 3rd * ectproc*1 Licenilag - i U COM ifl nt *nu oni Zq tl 4Un que R a r .-i u-s bd 1 I Fig Latitud Unqfit dc LU5 Iftftl...

Military Signal Generators

RS'510 U, ANGE 10 MM 1 THRU 420 MHZ AM CW OH PULSE MODULATION CAU BRATED ATTENUATOR MILITARV EQUIVALENT TO HP606D . 375,00 TS4 3 UHM61 RANGE 1.& GHZ THRU4 GH2AM PULSE CALIBRATED ATTENUATOfl MlilTAflY EQUIVALENT TO HP616A___________ 345 00 T542t URM-52 RANGE 3 0 TO GHZ, AMrPULSE CALIBRATED ATTENUATOR MILITARY tQiJfVALENT TO MPftt A ___IJ4& .00 HP aoaA. RANGE 50 KHZ THRU SO MHZAMiCW. CALIBRATED ATTENUATOR 450 00 HP G12A RANGE -ISO V Z Th u '230 ' HZ A'-' Pi Let MODULATION CALIBRA rLl>...

Ordering Rules

Mail check or MO for S62.50 + 5.00 for shipping or phone (2141 278-3553 to charge VISA, MC or COD order. (UPS COD only, add S2.50 COD fee) 2. Texas residents include 5 sales tax 3. Orders for this unit will be shipped within 46 HOURS or we pay the freight (weekends or holidays excluded) 4 ONE TIME OFFER LIMIT TWO (2) SUPPLIES PER CUSTOMER. cH& rigmg 3 te* > a'i& on t ht- txaorc th r Input Sup < > will do H - 14V (ajustable) -V. up 10 MA PeflfVT toftftai2mi e near .a mi Wi sfind lsfr...

Sol State Relays

P& B Model ECT1DB72 PRICE EACH 5.00 HLgisig, tnc, Model ECS-215 PRICE EACH 57.50 Grimsby Barton Model i ii7400 PRICE EACH 7> 50 I20vac contact at Tamps or 2Gamps on a 1 (Vfx ,124 nlmaldUij. Heatsink with silicon grease 240vac contact Kamps or Oarops an a 10,Fa 10Mx -124 .iluminus. Heatsink with silicon grease, 2-iOvac contact at I5iJtnps or AOampe on a 10* lf)x .124 , i 1 main urn _ Heatsink with silicon grease. NOTE *** Items may bt substituted with other brands or equivalent model...

Motorola Mhwr Low Distortion Wideband Amplifier Module

Power Gain ai 50MHz 16.6mm to 17 4max . Gam Flatness 0 1 Typ 0,2 Man dB DC Supply Voltage - 28vdc, RF Voltage Input + 70d8mV PRICE 29.99 GENERAL ELECTRIC AA NICADS Model diB OSHDi i Gi Pack of 6 for 5.00 or 60 Cells, 10 Pactos for 45 00 These may be broken down to individual cells ORDERING INSTRUCTIONS DEFECTIVE H4ATERJAL A i a ms *ot deti dvr n- lvnal mull D P made within ably Oil l a'lf res .pi Ol l.miza * Cla ma must nc yif he tje' c .*r j m. (fpr tes1 r g...

Keyboards Power Supplies

R 1 PS. un Jr iHirfuit ttart .in -0*F. C A-Comm Anod C C il mm T.H i h nil LH HH & k m ti r 0h I M h nc dOC. FEATLflES Llflhlweiflht neadphr f s. Liit riflhl t-a r C tOrttiCH Full fldfllllv Sler o Ound Add ttonai DlacK sou carrying case shoulder strap. Bett chp (handsfreet Opefafea on 3 AA eel* batten jnol mti ' Conr-a-' stza 3, - . i .VI o taiEAiiiitaH EKIMW wmwotiK Ctri thrrnituu canptrik -rth fin twwli** Part No. K& 69SD12-2 jFlli IniD DTE-2D EnclDturdf Ott int***t intwir IMp-1 Em Mt...

Power Pocket

Add S3.GO r T shipping r * (Confl USA < * **) 1 FAMOUS llEAVESDROPPEfl SW RECEIVING ANTENNA nent antenna Tunes the 2. 6, 15, 20 and 40me flr Amaleur rounds Offers V3WR oil l i when properly adjusted To opera hnQ frequency Weil for uu u A poftatiie emergency bt lerma loo AmOi te to simoit any horizon auppor* *tff> a chmp Wfngha fhan pounds inck Otng tive base Iciading coils not used for 6 2 raters) coftx Ime and counter pot Wrup 22'V k> ng bieo fAteilo S7 Mounl 4 14-tang Power ratmg 360...

Us And Foreign Patents Pending

Box 781 Thief River Falls, MN 56701 Phone (218) 681-7413 loieph I Cart K41PV 5440 South dt h Road Arlington I A 22204 In part I of this series, 1 introduced yoi to the principal IC logic families and the various different forms of logic gates. Here in part II we will continue our study of basic digital electronics by investigating flipflops. All of the digital circuits discussed thus tar have operated in a transient manner Gates and inverters do not have any memory, so...

Bri Ngs Satellite Tv Down To Earth

Satellite TV can indeed be your window to the world With one of our systems you will have the ability to receive overSO channels of movies, sports, educational, news, financial and religious programming. Our IVRO systems are configured from a wide selection of components for your own particular viewing interests and geographical location and are specifically designed to allow you to do the installation yourself. Micro Scan 11 ft, 4 piece fiberglass parabolic antenna with polar mount and...

Mail All Orders To Barry Electronics

MCKAY DYMEK FOR SHORTWAVE ANTENNAS & RECEIVERS, Constantine J Papas H BbFZN 4 3505 Sugar Cane Ctrde fayerfev Hh NC 2330 After spending many years using various Teletype*' machines and, most recently, a less-than-adequate video RTTY set up, 1 finally decided to use my Apple III computer for this mode I have owned my Apple for three years and have had the Chuck Galfo Fig. 2. The interface on an Apple prototyping board. 34 73Magazine OctobeM982 Fig. 2. The interface on an...

When You Need Just A Little More Audio

The F4STTV4K < model 2003 audio amplifier module produces 250 mW of low i HD audio, This transformerless design has low parts count and does not require a heatsink* The model 2003 features a de-operated volume control. Output level is selected by changing a dc voltage with an on-board pot, remote pot or micro-computer D A interface, Low-Z, ac-coupled output drives speaker or headphones. jj jj ' Dc-type volume control assures hum-free operation without using shielded cable to the volume...

The Word Is

The word is out The SSI I 5 8 wave The gain of the SSI I is specified in DB at a am Exhibits 90S gam ove* a RD2S 1 4 wave and 5 8 wave over a RD2S Rub ber Duck These gain figures have been obtained from extensive field strength readings. They are not represented as tuned Rubber Duck and 3DB when collapsed toa 1 4 wave. In fact. theSSII is the only 5 8 wave HT ant. That will collapse to a matched 1 4 wave .and gain over a dipole or 1 4 wave the RD2S Short Duck was equal to or ground plane Nov....

Low Cost High Frequency Counter

The Alliiij Muriel 0M 7 Dig i I Higri Fr qpBncv Ebunler ts eisy to u a, Switch l Clabla ti nisi bflSfl in lu i by > i iinfll HM nutfung ID h llt 1 - 8 btfl easy ro-road 3 n-gn .rnrensjiv LI D iftspby - Crysta1 3 wn c cor-- 3 1 .i 9 Sfc mti - Cffwen cm > tocNap Stfw t *10 * J I (X1 4e atnacii cast