Special Offer

BC D to 7 - Segment Decoder driver PLESSEY SL403D 3.5 W AUDIO AMP IC HI-FI QUALITY 3.95 The MINITRON readout is a miniature direct viewed incandescent filament (7-Segrnent) display in a 16-pin DIP with a hermetically seated front lens. Size and appearance are very similar to LED readouts. The big different is in the price. Any color filter can be used.

Hal Communications

Box 365L, Urbana 1L 61801 217 359-7373 COMMUNICATIONS HAL ID 1 REPEATER IDENTIFIER Circuit board wired & tested____ 75.00 With rack w cabinet S115.00 TTL logic. Power line frequency counter for 3 minute or less timing and controJ. Easily reprogrammable diode ROM uses only 27 diodes (depending on call) to send DE any call. Low impedance audio with volume and tone control. All circuitry including PS on small G10 glass PC board. Write for full details. HAL COMMUNICATIONS, Box 365L, Urbana IL...

Clock

HAM' UHF 400 MC HIGH POWER ill TRANSISTORS , H - in iif ci-n' ft u '(iwn num r l , H. x W - Churacters INI-7* 1,75 * 1.7 +J60 * .570 r .IM-7* 16 0 37S ,40 * .20 Compatjhl* to 7-wimiirt driver IC* LEDS, visible, micro-miniature, ead LEDS, infrured, timbo, TU*'l LEOS, vinible, jumho, red, TO-1* - , . LCD, invinibie, parabolic reflector, iit'A . . . PHOTO TJRANSlSTORr with ilrtriiUgt rj jimp filter, PHOTO TftAKStSTOftS* v iili dnrlin lon amp, ' S'.'T' PHOTO CELLS. (laiiVK pancadie, iOK-Ta fihms...

Big New Voice In Chicago

A powerful new repeater is on the air in Chicago. It has been established by the Pioneer Amateur Radio Club, a group that has become known more by its QSi cards than by its publicity. Most of the club members are professionals in the communication field, and their club s story is an interesting one. The telephone industry has a sort of old timer's club that has been named The Telephone Pioneers of America 1 Membership is open to anyone who has worked in he telephone industry for 2 years or...

Electronic Feather Touch

The Electronic Feather Touch Key is completely solid state. It requires no paddle movement, no sprmg tension or contact clearance adjustments and has no keying contacts. Keying problems caused by contact corrosion and bounce as well as paddle tension and movement adjustments are no longer a concern. The key is the natural interlace for the extremely low current, high speed integrated circuits used in solid state electronic keyers. It sells for 2195 (with remote spot PB. switch). Data...

V

NEW SOLID STATE 2M REPEATER SC-ARPT-1 Complete packaged repeater designed for today's popular 2M FM band. 12 vdc Idea for new system or emergency portable operation. Time-out timer, adjustable 0-5 min. Remote Control and accessory provisions. Receiver 0,4 v or ess. 19 Rack Panel Mounting, O Size 19wx5hx9d

Tk

We'll show you more of the West Indies than you'll ever see out of a hotel room window. You'll set foot on Dominica, Montserrat, Guadaloupe, English Antigua and French Martinique. rou ll skindive, swim, snorkel, prowl uninhabited beaches. You'll limbo, calypso and rock to a steel band. Take a night watch or fall asleep under a star spangled sky. 10 days from 250. It could make the best-seller list Cap'n Mike. Windjammer Cruises. P.O. Box 120, Dept. -934D Miami Beach, Florida 33139. 3 m d O 1 ty...

Model Mv Top Band Meter Antenna Tuner

The FCCs recent initiative to raise power limits and expand frequency privileges on 160 meters has given rise to a tremendous increase of interest in A variety oi commercial rigs on the market today provide facilities to operate 160 meters, but antenna requirements for the Top Band have always seemed to hinder those hams living in residential areas. Now, with the development of l op Band Systems Model 48MV 160 Meter Matchverter, any ham having enough room for a 40 or 80 meter inverted vee...

And Driver

T1 here have been numerous articles using inexpensive RTL resistor - transistor -logic integrated circuits in frequency counters and in digital volt-ohmmeters. A good friend, Joe WA9CGZ, built he digital voltohmmeter from a magazine article1, and, after making some changes in its circuitry to improve its drift problem , brought it over for me to try. I was favorably impressed, but it left me cold in one respect. It had idipt lights for readouts, as do all the other frequency counters fhve seen...

Meter Fm

HamPak-2 portable power case 189-95 Over-ail Dimensions 9 deep x SWf wide x 2Va high Number of Transistors 11 all silicon transistors, 4 diodes, 5 FETs, 3 integrated circuits Power Supply 12 VCC System, negative ground Transmit Htgh 5,0 amps. Low 1.7 amps includes 146.940 MHz, Remaining 9 frequencies, at nominal charge each for installation at factory or by owner. Sensitivity less than 0-5 microvolts for 12 db SiNAD Image More than 45 db Spurious More than 50 db Selectivity 6 KHz Receiver...

Fet Sample Under Test

Diagram The circuit of the I GSS tesL Note that the FET voltmeter is set to the 0.5V range and reads as 22.72 nano-amps full-scale. Polarities shown are correct for an N-channel device, If P-channei devices are to be tested then the supply connections and the meter connections must be reversed. This is most easily done by reversing the transistor socket connections. Diagram The circuit of the I GSS tesL Note that the FET voltmeter is set to the 0.5V range and reads as 22.72 nano-amps...

Info

When buying 2 meter FM equipment or any other Ham gear, for that matter . SWAN ELECTRONICS gives you much more a lot of which you can't see INVESTIGATE BEFORE YOU BUY Compare Swan's FM-1210A for. example, to other 2 meter FM transceivers with a rated R F output of 10 watts. The FM-1210A gives you 144 channel combinations through independent switching of 12 transmit and 12 receive frequencies from 144 to 146 mHz. - Eight crystals not just 3 , , . TRANSMIT 146.22, 146.34, 146.76 amp 146.94 mHz...

Meterfm Amplifier With Builtin Ac Power Supply

Operate at home - 110 VAC or car-12 VDC. Supplies regulated DC for transceiver. 1W in 15W out-AC 1W in 10W out-DC. Auto T R Send for brochure ONLY 69.95 QUEZAR COMMUNICATIONS PO Box 235 Titusville, N.J. 08560 12VDC POWER SUPPLIES all 115VAC Input Perfect match for FM Equipment. Solid State, Circuit Breakers open till manually reset provide top protection. Multiples of basic voltage and current obtainable bus bars available for easy stacking with 3a reg. supply. 3a unit also has flat power curve...

Out

Also be cascaded and the individual filters tuned to different frequencies to provide a variable comb effect. Active filters ai radio frequencies require integrated circuits with the necessary frequency response and the return to inductors, although of a more convenient size. Figure 6 shows a band reject amplifier utilizing a Signetics differential amplifier. Good Q can be obtained, where wide response is not a requirement, by using torroid cores for winding t he coils. By changing the position...

Hot Gear

Stolen early this year I Home-built 2M rig built in a surplus .50 caL ammo box, 1 diameter black meter with redrawn face in upper right comer separate Xmit and Rc oscillators, each with switchable channels. Built from components of RE-401 Series VJJF Xcvrs, Has 13 internal nicad batteries- Box is brown except for aluminum plate on which oscillator switches are mounted, 2 Heath HW-I00 Xcvr and AC power supply, Marks on top where a bracket was mounted. Also WA0DAM Sooper Dooper Band Blaster typed...

Ground Plane

Then along comes some crazy guy who wonders, what happens if you take awLiy one of the ground planes Will it still work Fortunately for the world of science, yes, it will work, and it is called micro-strip. After this war, and the Korea thing, some mention was made of space travel. Now. scientists, engineers, and amateurs eg, OSCAR 1 were all looking for a way to make microwave printed circuits. Someone remembered this rectangular thing and said this suppose we make the rectangle thinner and...

Spectronics Frequency Counter Model Yc

A portable 5 Hz to 30 MHz frequency counter - is being introduced by Yaesu Musen. Ltd, Tokyo , through the company's North American distributor, Spectronics Inc., Signai Hill, California. The new counter, designated Model YC-305. leatures a dual-range system that provides 8-digit measurement with MHz or kHz indications, Tiie unit will operate from a power source of 117V ac or I2V dc. Accuracy is time-base stability of 5 PPM one count. Overall size is 8 4 by 3 x 10 in. Weight is 8 lbs. The unit...

International Ex Crystal Ex Kits

OSCILLATOR RF MIXER RF AMPLIFIER POWER AMPLIFIER A single tuned circuit intended for signal conversion in the 3 to 170 MHz range. Harmonics of the OX oscillator are used for injection in the 60 to 170 MHz range. Lo Kit 3 to 20 MHzt Hi Kit 20 to 170 MHz Specify when A small signal amplifier to drive MXX-1 mixer. Single tuneci input and link output. Lo Kit 3 to 20 MHz. Hi Kit 20 to 170 MHz Specify when 3. PAX-1 TRANSISTOR RF POWER AMP A single tuned output amplifier designed to follow the OX...

Science Hall Offers Classes In Ham Radio

The Hall of Science of the City of New York will conduct a series of twelve instructional and practice sessions for teens and adults in Amateur Radio beginning September 30 at the Hall, t 11th Street and 48th Ave,, Flushing Meadows Corona Park. Course for the Novice, Technician, General and Advanced class FCC Amateur Radio licenses will be presented, with all courses scheduled from 10 AM to 12 noon and repeated from 1 PM to 3 PM on consecutive Saturdays. There is a registration fee of S5.00 and...

Staff

Keith Lamonica W7DXX 1 Assistant Publisher Yvette Grimes WA8ULU 1 Associate Editors Jim Kyle K5JKX Mike Frye WB8LBP Bill Turner WA0ABI Jim Weir WB6BHI Harry Simpson A4SCF W4SCF Dave Ingram K4TWJ WTW Editor Dave Mann K2AGZ Technical Consultant Bill Hoisington K1CLL Technical Editor Lynn Panciera Fraser Production Philip Price Kalherine Gibson Mark Poole Photography Ruthmary Davis Cynthia Schfosser Subscriptions R. K. Wildman W6MOG Bill Morello Wayne Peeler K4MVW T. M. Graham

Samken Hybrid Audio Amplifier Modules

e have made a fortunate purrtiaje oi Sank en Audio Amplifier H bnd lodu es. With these yotl can build your own audio amplifiers at lea than the price of discrete component . Just add a power supply, ind a rhaiuas to act as a heat gt wk. Brand nev uruU,' in original boien, guaranteed by B and F. Sanken and the Sanken U.S. distributor. Available in three sizcj 10 watts KMS t.v watts music power . 25 watts RMS 50 watte M.F. and 50 waits RMS 100 walk M.P. per channel. 20 page maniifartur rs...