More Receiver Information Received

Thank you for publishing How The Communications Receiver Began ' March 1974, Truly a refreshing look at the great beginnings of radio communications, with most of the contributions by active hams, Concerning National Company and the justly famous HRO. Two names deserve special mention James Mil ten W1HRX and Dana Bacon W1BZR. The precise division of labor at National is a bit unclear, but I know that Millen was by training a mechanical engineer and was responsible for the National line of...

Mobileers Bash

The Maryland Mobileers ARC Harrv fest is June 16, Father s Day, at Anne Arundel Community College, Arnold MD, at 10 00AM - rain or shine. Talk-in on 10 70 and 146.94, Games, refreshments, contests and an auction are planned. Top awards 2m transceiver and an electronic calculator. Registration 2, tailgating 2. Free parking, but plan car pools to save precious petrol. For futher information contact Ted Redick K3UPU, 2 Acton Place, Annapolis MD 21401, Telephone 301-269-5577. August 4, 1974,...

Twx

Price - 2 pet 2T> wards for norvciiinmerrial ads 510 p< f 25 words for business ventures No dmotav d Of agency discount lr> clude your chct* with Crete' Price - 2 pet 2T> wards for norvciiinmerrial ads 510 p< f 25 words for business ventures No dmotav d Of agency discount lr> clude your chct* with Crete' Derttllmtf Ifii ads the 1st ot the monih two rnonihs prior lo publication For exampte Jan.,sfv lit is The deadline tor the March i ue which ,vil+ bp rr j.led on rhe lOrh of...

News

Mtchaei F rye WB8LBP 640 Deauviife Dr. Dayton OH 45429 Space Science Involvement a 64 page curriculum supplement in tended for secondary school teachers, is now available from ARRL Headquarters, Produced by educators at the Talcott Mountain Science Center, Avon CN under contract from AMSAT. this curriculum source material illustrates how AMSAT OSCAR 6 can be used as a classroom instructional tool. For your free copy of the book write Bill Dunkerley, c o ARRL, 225 Main Street, Newington CN 0611...

Sbi

Add S5 for air shipment. 111. res, add 5 sales tax, L Frederick H. Vogel WN3QBK 500 23rd Street, NW B-401 Washington, D.C. 20037 your (i ori wo believe that that to wot is actually a priceless Picasso sculpture then read on , . * This is another answer for the ham who has a luxury apartment complete with everything except permission lo erect antennas on the roof or to run wires on the building exterior. The idea was born when I saw my clandestinely mounted...

Info

We Ship U S wJiEdrievHi possible Give sireei address. Include enough for uoarage, excess refunded in cash Florida residents include 4 Tax We Ship U S wJiEdrievHi possible Give sireei address. Include enough for uoarage, excess refunded in cash Florida residents include 4 Tax up in consequence, and the ignition has enough for a nice hot spark and VAROOOM - the engine starts. The only thing that could be done about that 50 business would be to increase the size of the battery. If you made it ten...

Ygain Electronics Corporation

8601 Northeast Highway Six 402 434-9151 The most popular three band beam in the world Superior construction and performance make the difference in Hy-Gain's popular * Thunderbird s Hy-QM traps provide separate traps for each band. lkHy-Q' traps are electronically tuned at the factory to perform better at any frequency in the band-either phone or CW. And you can tune the antenna, using charts supplied in the manuaf, to substantiate outperform any other antennas made. * Thunderbirds superior...

Description

Only one fiqmd crystal display provides excellent contrast and readability in diffused light FElIX Field Effect Liquid Crystal from llixco. FELIX liquid crystal displays produce superior optical properties than other liquid crystal system hecaust of their bi level characteristic. The Felix display sysif-rri has iwo distinct optical sidles, so that display segments are fully ofi at 3 volts anrt completely on at 7 volts. Bi level refers to the two tevels of optical activity preseot in specially...

Ugw

This light weight, take anywhere transceiver has the Regency-type interior componentery to give you what others are looking for in portable communications. You get a heavyweight 2.2 watt signal or if you want, flip the Hl LO switch to 1 watt and the receiver gives you 0.7 uv sensitivity and 0.5 watts audio. Both transmitter and receiver employ band-pass circuitry so that power and sensitivity are maintained across the entire band. Get one to go only 7707 Records Street Indianapolis, Indiana...

Ground Plane

Tlhe last time strong winds turned my homemade beam and removed the teeth from the rotor gears, decided it was the last time. My financial situation would not permit procuring a good rotor, so an inexpensive homemade multiband ground plane seemed like the answer. Having had good luck with a water pipe as an antenna element and a dielectric pipe union as an insulator, I tried my luck at a plumber's ground plane. The antenna is simple to construct, with a little plumbing ability or help. The top...

Automatic Keyer Module

This new, tow cost, two-ounce keyer module has full squeeze iambic operation yet draws less than one ma,key down Attach 9v transistor battery and forget it Great for QRP rigs, The AKM-25 has dot dash and space memories for sefNcompfetion of code elements. Use with any key lever This tiny module has internal sidetone monitor transmitter spot function, 6 to 60 wpm speed, and keys or -lines to common without external components. Use any 4 to 15vdc source. Write or call for brochure. 303 794-7234,...

Q Model A Sstv Monitor

Displays amateur standard pictures from any SSTV audio source station receiver, tape, camera. Six inch tdiagonal display. Front pane controls for easy station operation. Connectors for receiver, transmitter. microphone, tape, waveform monitor, LED tuning indicator. All solid state except cathode my tube. Generates amateur standard SSTV pictures and fast scan video for viewfinders. Ample sensitivity in ordinary room light. Controls for contrast, brightness, vidicon beam, SSTV signal level, black...

Write For Brochure

Watsorwille, CA95076 was disappointed with the performance of his receiver for some reason and quickly lost interest. Subsequently I bought the Drake for two shares of stock in a glamorous defense conglomerate and 25 cash. Some time later I accepted employment with said conglomerate and their stock promptly dropped to one-third of its former price. I maintained this was the sheerest coincidence. but my friend never lets our occasional lunch pass without a hurt reference to the...

Converters

Very sensitive crystal controlled converters for receivif j The VHF bands with your present receiver or transceiver. Ideal for DX FIVT, Satellite reception or for just Talking to the gan lt 3 Alf hate built in supplies for operation from either 1 17 VAC or 12 VDC. TO Meter output is standard. Beautifully built and carefully tested with modern equipment, Very sensitive crystal controlled converters for receivif j The VHF bands with your present receiver or transceiver. Ideal for DX FIVT,...

Xko

Quement Swb

Basic components of the dual-band remote antenna coupler system. type and the direction of rotation is controlled simply by changing the polarity of the motor voltage supply. The coupler unit circuit is shown in Fig. 2. The unit was designed for use with about a 20 foot rod antenna on 80 and 40 meters. As was mentioned before, the basic scheme shown can be used with many coupler arrangements. However, one should be sure first that the coupler will properly tune manually with a given...

Hv Power Supply

The James Millen Manufacturing Co., Inc. is pleased to announce the addition of the new -90202-D Plug-in Module High Voltage Power Supply for use with small Cathode Ray Display Systems. The 90202 D supplements the other Miilen plug-in modules. The Millen 90202-0 High Voltage Power Supply is designed to provide up to 1400V high voltage dc acceter ating potential and filament-heating power for small and medium size cathode ray tube indicators. The high voltage is rectified by a semiconductor...

Tempo

Tempo's Commercial Line VHF transceivers offer commercial performance at amateur prices. Compare these transceivers with any other available. Compare their performance, their quality of construction, their ease of maintenance, and then compare prices. Your choice will have to be Tempo. So much for so little 2 watt VHF FM hand held, 6 Channel capability, solid stater 12 VDC, 144-148 MHz any two MHz t includes 1 pair of crystals, buiiHn charging terminals for ni-cadl cells, S-meter, battery level...

Sub Miniature Sensor

A miniature optical sensor no bigger than an adult's thumbnail has been developed by General Electric Company for use in hand-held or vest pocket TV camera systems for a host of uses in business, industry, government and the home. Making possible a tubefess TV camera no larger than a pack of cigarettes, the tiny sofid-state sensor and essential circuitry is called a CiD Modufe Charge Injection Device and converts optical images to electrical video signals. With decided advantages over tube and...

Crystal Specials

2-METER FM for most Transceivers ea S3.75 144-148 MH2 .0025 Tol. Almost all CB Sets, Tr, or flee. 2.50 Any Amateur Band in FT-243 1.50 80 meter, S3.00 - 160 meter not avail. 4 5_00 For 1st class mail1, add 20c per crystal. For Airmail, add 25c. Send check or money order, No dealers, please. Division of Bob Whan amp Son Electronics. Inc 2400 Crystal Drive Ft Myers Florida 33901 Division of Bob Whan amp Son Electronics. Inc 2400 Crystal Drive Ft Myers Florida 33901 Send 10c for new catalog with...

Antenna Coupler

Schultz W2EEY 1 c o RLC Inc., 30 East 42nd St. New York, New V rie 1004 Simplified and inexpensive motor-operated remote control of tuning and provision for remote reflected power monitoring are features of this coupler. he ideas presented can he applied to a variety of situations where remote control and band-switching of an antenna coupler unit is desired while utilizing only a single pair control cable for all remote control functions. Instead of running resonant feedlines or the end...

Nzk

FSK demodulator contains 2 active filters, saving space and improving performance over designs that use conventional LC tuned circuits. Filter A passes the space frequency of 2,025 Hz, while filter B passes the mark frequency of 2,225 Hz, The op amp operates open loop, summing the filter outputs. For a mark input, the output transistor saturates so that circuit loop closes. This circuit works fine on a breadboard. Thanks to F C. Hervey K4ETZ, for submitting this circuit from the July 19, 1973...