Info

Low distortion circuit '5 10 dB improvement in TALK POWER not a kit Several models to choose from 'Works with phone patch Quality construction includes Silicon transis tors, FETs. Glass circuit boards 22.50 -S34.95 (Illinois residents add 5 Sales Tax) Write for specj icat orts and information sheets (FREE) Demonstration Tape cassette available ( 2.00 deposit) Voltaic International Corp. of Dallas, Texas, announces a solid-state electronic lamp dimmer socket. The entire dimmer circuitry is...

Bc Transceiver

Easily adapted for 7 way voice or code on Mobile, Television Experimental, and Cil-i Bands. With tabes, less power supply in factory carton, BRAND NEW SPECIAL PACKAGE OFFER 8C-645 Transcei-accessories, including mounting, UHF Anienm complete set of connectors and plugs, B< und New r. pynomotor and c Assemblies, confr r. pynomotor and c Assemblies, confr TG-34A CODE KEYER, self-contained, uutomutic, reproduces code practice signals from paper tape. 5 to 12 WPM Built-in speaker. Brand new with...

Meters

MOTOROLA FMTR140D, 6 or 12 volts, 60 watt, wide band. Dynamotor Power Transmitter Narrow Fully Narrow complete with accessories (less accessories deduct 15) GENERAL ELECTRIC PRE-PROGRESS 4ER6 RECEIVER, ET5 OR ET6 TRANSMITTER 30 or 60 watts (as available), 6 or 12 volts, including all

Extra Class Study Questions

What are sideband frequencies During 100 - sinusoidal amplitude modulation, what percentage of the average power is in the sidebands How is the sideband power related to the percentage of modulation 2. Who do the modulation envelopes of amplitude-modulated waves with 75 , 100 , and greater than 100 modulation look like 3. How may a limiter be employed in an I M receiver 4. What precaution(s) should be taken when measuring the rectified grid voltage in an oscillater with a d.c. voltmeter 5. What...

Famed Eme Site To Be Dismantled

Bill Smith (W3GKP) was the first ham radio operator to make EME (moonbounee) on 2304 MHz, and he didn't do it with an ordinary dipole. As the photo shows, it takes a real antenna. The approximate size of the big dish can be estimated by comparing it with Bill himself, who is standing at the lower right. In this picture, he is acLually closer to the camera than the dish itself. According to Smitty, he will be leaving the area soon, and the historic site will be no more. The dish It goes with...

License Of Wbgtg

Obscenity, Out-of-Band, and Other Violations Cited. The FCC moved to suspend the Advanced class lisence of Brad McGann (WB4GTG) after noting a number of alleged violations. According l o a recent order from the Commission, the licensee allegedly committed the following infractions of Amateur Rules and Regulations Transmitting a false call sign operating on frequencies that aro reserved for Extra class operators operating his equipment completely out of the amateur band operating his phone...

Vietnam

On behalf of the entire Army Mars Station, AB8AQ located in I Corps Vietnam, I would like to thank you for sending us your publication. Being in the northern section of the country we seem to get very few magazines or newspapers, and are always grateful for any periodicals we get. But working in the Mars Station and being a former ham myself, it is particularly enjoyable to receive your magazine. Mr. Alex Scherer, W9EU and A9EU, wrote us and reported that you had sent us the issues. And we do...

Advanced Class Study Questions

Questions based on part 97 of the Commission's Rules which governs the Amateur Radio Service. 2. What is meant by the Standing Wave Ratio (SWR) of a transmission line What is a good indication that a high SWR is present on a transmission iine Where is the best point on a long transmission line to measure the SWR 3. What methods are most commonly used to generate single sideband signals Draw a block diagram of the filter method showing all essential stages. How can a low frequency SSB signal be...

Electron

305 Airport Road Oceanside, California 92054 A Subsidiary of Cubic Corporation Betty J. Daniel WB6AOF 12195 Butterfield PI. Chino CA 91710 If a wife wants to share her husband's interests and be able to talk intelligently to Mm about his work, she must put forth her best efforts to learn all she possibly can about the things that interest him most in life. A simple fact Well, maybe for some wives who are married to doctors, attorneys, etc. BUT what do you do when your husband owns and operates...

Schematics Available

ARR-15 from June 1965 73, page 78. 1102. ARC-27 2M Guard Channel Receiver. 1103. SSB Transeiver, Nov. 1961 73, Page 23. 1104. R OS ARC, June 1965 page 48, before & after. Hoy lavishly Order today from RADIO BOOKSHOP Peterborough NH 03458 GUNSMOKE Blow your mind on our back issue bargain bunch, 30 (count 'em) assorted (we hope) back issues, all before 1968, for the incredibly low price of 6 postpaid (hardly pays for the postage). These are packed by slave labor (to cut costs) so please...

Fresno Dxers Meet

The annual Fresno DX convention will be held on January 30 and 31. For registration information, write K6RQ, Frank Glass, 14910 Bascom, Los Gatos, CA 95030. Blossomland Amateur Radio Association's 4th annua auction and Swap-Shop wiSl be held at Shadowland Ballroom, St. Joseph-Benton Harbor, Mich, Sunday, March 14th 9 00 a.m. to 4 00 p.m. Hot Food. Prefer to do your own selling Rent one of our swap tables. If that fails, let our skilled auctioneer put your gear on the block. Direct inquiries to...

Testing The Rp Electronics

When the pile starts building up on a rare one you need that extra oomph to get a word or two in edgewise. Once you have your kilowatt and your three-element beam, like the others in the pile, what can you do to get that edge It will not come as any big news that the next step is either an illegal attic antenna matching unit (with power supply) or a compressor. Do compressors work Of course they do If they didn't you wouldn't see quite so many on the market. Like everything else available to...

Vanguard Labs

196-23 Jamaica Ave., Hollis, NY 11423 Tell Our Advertisers You Saiv It in 73 Both were on SSB - LX1SL at Niederan-vcn (whose photo appears here) and LX1SK, who is a teacher at the Diekirch High School and organized and ran the Boy Scouts Jamboree on the Air Station at Ittelbruok with a Galaxy V Reverting once more to VHF, Luxembourg's situation and the high plateau location enable QSOs to be made on VHF with Germany, France, Belgium, Holland, Britain, Switzerland, and many other European...

Crosshatching Represents Aluminum Sheet Metal Strips

The driven element can be any good-quality quarter-wave whip. Keep the whip insulated from the reflector and feed it with S0i2 line. The sheet metal shown in Fig. 3 is approximately 0.04 in. thick. You will need a roll about 80 ft long. This will act as a giant reflector element giving the antenna a 40 dB front-to-back ratio. Figure 4 shows the driven element FG. This may be any good quality vertical antenna such as the hustler series by Newtronics. It must be resonant on 10, 15, or 20...

Model Cl

Designed to provide the extra gain ior working hard-to-reach DX. Incorporates the exclusive Mosley patented Balanced Capacitive Matching. Features include si Trap-Master traps with resonant frequency stability, improved boom for even wider element spacing. Stainless Steel hardware. Fits up to 2 mast. Use with most heavy duty rotors. The CL-33 is designed for 1000 watts AM CW or 2000 watts P.E.P. SSB. Keep track of over 200,000 contacts. Recall in seconds whether you have contacted a station...

Los Angeles

Plus a large staff of highly qualified sales and service personnel pledged to serve you. Henry Radio carries large stocks of all major brands. We take trade-ins, sell used equipment and offer better terms because we carry our own financing. Our reconditioned equipment carries a 15 day trial, 90 day warranty and may be traded back within 90 days for full credit toward the purchase of new equipment. Export inquiries solicited. Also, military, commercial, industrial, and scientific users please...

Ox Oscillator

Lo Kit 3,000 to 19,999 KHz Hi Kit 20,000 to 60,000 KHz Specify when ordering BAX-1 Broadband Amplifier 3.75 General purpose unit which may be used as a tuned or untuned amplifier in RF and audio applications 20 Hz to 150 MHz. Provides 6 to 30 db gain. Ideal for SWL, Experimenter or Amateur. SAX-1 Transistor RF Amplifier 3.50 A small signal amplifier to drive MXX-1 mixer. Single tuned input and link output. Lo Kit 3 to 20 MHz Hi Kit 20 to 170 MHz Specify when...

The Gambia

Look for ZD3D around 21.410 at 1800- 2000 Tuesdays and 14.225 around 2200Z. Sometimes contest-style contacts, sometimes a list. QSL to VE2DCY. Good luck. Rules for WACAM Award for holders of WAVE Award . Produce QSL cards to verity QSO with 2 different stations on 2 different bands in each of the following 3 sections. Labrador and or Newfoundland VO , British Columbia VE7 , Yukon and or Northwest Territories lt VE8 . Submit the 6 QSL cards, WAVE award No, and 1 or 10 IRCs. Cards will be...

Sstv Worldwide

CQ Elettronlca Magazine proposes and sponsors the .1st Worldwide SSTV Contest to be held on Feb. 7 0700-1400 GMT and Feb. 13 1 500 2300 GMT . Suggested SSTV frequencies are 3.740, 7.050, 14.230, 21.100, 28.1.00 MHz. A pix Exchange is necessary, though the message number may be given by voice. A two-way contact with a station receives one point total points will be the number of individual stations contacted . No extra points will be allowed for contacting the same station on different bands. A...

Diode Ring Balanced Modulator

Diode Balanced Modulator

Fig. 4. 2-diode ring balanced modulator. frequency more easily converted for multiband operation. A common balanced modulator without balanced transformers, for ham use, is shown in Fig. 3. Notice that the matched diodes are connected in a ring rather than a bridge configuration. Good shielding procedures and matched components give a typical carrier attenuation of 40-45 dB. It is not necessary to use four diodes to form a balanced modulator. As shown in Fig. 4, a two-diode balanced mixer in...

Homebrew Fm Receiver

A number of hams in this area have been trying to design a multichannel, solid-state, 2 meter FM mobile receiver. We have expectantly watched 73 Magazine for construction plans, while burning out transistors and ICs in tfur own experiments. We recently purchased a number of surplus 10.7 MHz i-f strips and would hope to utilize them if possible. Any consideration given by you or your staff to this problem would be greatly appreciated. We have several receiver articles currently in edit, one of...

I

Miniproducts Vertical

The Mini Products C4 multiband coxial vertical dipole on the Hotel Meyer at Beaufort from which G3BID LX radiated, with the head of G3BID visible in the skylight. The Mini Products C4 multiband coxial vertical dipole on the Hotel Meyer at Beaufort from which G3BID LX radiated, with the head of G3BID visible in the skylight. propagation of the region around Vianden or Bouiaide - to the deep gorges of the Sure or the Entz. The hotels in many of the little villages are good, and one's nights can...

Fine Test Equipment

Used, checked and guaranteed in top condition. H-P 523-B counter, 1 Mc 275.00 H-P 524-B counter, 10 Mo., can go to 220 Mc. with plug-in converters, not H-P 185-A Sampling Scope with 187 dual-trace Vreamp. amp probes. 1000 Mc 600.00 H-P 120 Scope dc to 450 Kc 125.00 H-P 200-CD audio oscillator 6 cps-200 Kc. H-P 212-A Pulse Generator 75.00 H-P 202-A bow-freq. Function Generator. . . 100.00 Rutherford B-2 Pulse Generator 100.00 Nems-Clarke 1412 Receiver, 215-260 Mc. Exc. con., except VU meter...

Mali

What may possibly bo the first legitimate DX operation from Mall took place in early November when DJKQT and DJ1QP went on with the call TZ2AB. They contacted Lloyd Colvin W6KG, who spent two fruitless months in 19K7 trying to arrange for a license, that theirs was the very first license ever issued by the Mali government, This raises some questions perhaps better not asked of one or two previous expeditions11 to Mali. The team operated only a short time from Mali and then went on to operate as...

Tener Modification

Dick Ellen K8JLK 426 Central Parkway SE Warren OH 44483 Much has been written about Murphy's Law and other such disaster syndromes, but it has only been a matter of recent time that I have dared to admit the existence of the excruciating Ellers Effect. The effect in action would have me put a Heath Tener in the car, start off for some mobiling, but promptly blow the I.SA fuse because I had forgotten to install the heavier 8A protection required for the dc supply. Conversely, and with greater...

Twx

Amateur radio has had more than its share of dropouts, as these memorable old photos attest. But things may be different before too long there are subtle but definite signs of an upswing in the offing. Over the past few years informed marketing specialists and industrial advisors have warned firms against approaching the once-booming amateur radio world with new products. Even othe long-time manufacturers of amateur radio gear have Some of the staidest old guard manufacturers in the ham radio...

Motorola Models

T51GGV 6 meter mobile unit with accessories, 60W transmitter, 6 12V vibrator powered in 15 housing, with or without private line feature 85 T41G 6 meter mobile unit with accessories, 30W transmitter, 6 12V vibrator powered in 10 housing 64 U51GGT 6 meter mobile unit with accessories, 60W transmitter, 12V transistor powered in 10 housing 149 T43GGV 2 meter mobile unit with accessories, 10 housing. . . 99 T53GKT 2 meter mobile unit with accessories, 20 housing with two separate transmitter strips...