Radio Amateur 04-1973

Gregory Electronics Corp

The FM Used Equipment People 243 Route 46, Saddle Brook, N. J. 07662 14 case less accessories amp ovens 6 12 volts, 30 watts, vibrator power supply Accessories available for each of above units Just Arrived General electric Message Mates High Band G.E. PROGRESS LINE STRIPS physically complete, but sold on an as-is basis only less vibrator_J20__ __S20__ __S20 less vibrator__ 25__ __ 25__ Jess final tubes 18 25 25 30 12 Note MA E42 wide band_____ 14 Progress Line Case, consisting of front basket...

Two Meter Amplifiers

1973 Ham Radios

In the December issue of 73, I described an amplifier that would deliver 25 watts output when driven with 5 to 7 watts. In this article, I am presenting two more inexpensive amplifiers that, when used together, can take 100 milliwatts and amplify it to about 7 watts - enough to drive the 25 watt amplifier. If you want, you can eliminate the first stage and get 25 watts output when driving the last two stages with a 1 watt rig, such as the TR-22. All of the three amplifiers are suitable for...

Heathkit Electronic Centers

ARIZ, Phoenix, 2727 w Indian School Rd. CALIF. Anaheim, 330 E Ball Rd , Ii Cerrito, GOM Potrero Ave . Los An elev 2309 S- Flower St Pomonit 1SS5 Orangt Grove Ave. N. Redwood City. 2001 Midd'efie'd Rd Sin Qit a U Me . 8363 Center Dr. woodland Hills 22504 Ventura Blvd. COLO. Denver 5940 W 3 th Ave., CONN. Hartford A onJh 395 W Main St Rte 44 FLA. M.imj Hiafeah , 4705 W. 16th Ave . CA. Allanta, 5285 RoswalJ Rd- ILL. Chicaio, 3462-66 w Devon Ave. Downer Grove, 224 Ogden Aye. I NO, Indianapolis, 21...

Superex Headphones

1973 Ham Radios

Imow you too can get automatic accurate time announcements from your repeater. The WA1KGO repeater A new low priced set at sieitiu headphones is being offered to the ham market by Superex. For 19 95 you can forget those heavy uncomfortable cans and sit beneath something with a designed-in comfort factor. Although the frequency response of stereo phones isn't by a long shot tailored for voice communications, most modern receivers have bandwidth filters and shaped audio sections that limit audio...

Low Pass Filter

Box 494, Stare College MS 39762 CLEANING SHACK W General Elec trie IVIA E 36 w 4 frequency deck. Independent T amp R frequencies, with 3 sets crystals and spare vib, P lt S. 125. Aerotron 6n1QG MA Amplifier, 3 15 watts in - 80 to 110 out. With spare 5894 tube new , 75. Hammar und FM-50a with 34 94 and 94 94 cry stats ac dc P,S, 25 watts out for only S50. All items are in good working shape, Rob, WB2ATX 201 224 9659. U WTEDj OLD RADIO TRANSCRIPTION DISCS. Any size or speed. Send list and...

Camp Albert Butler Radio Session

Courses Taught General Theory and Code Advanced Theory and Code Amateur Extra Theory and Code Golf privileges at New River Country Club also fishing TRUL Y A I ACA TWN WITH A PURPOSE People attended from rJif following states and areas North Carolina* South Carolina, Missouri, Tennessee, Utah, Florida, Oklahoma, West Virginia. Alabama, New Hampshire, Iowa, District of Columbia, Vermont, Arizona, Indiana, Ohio, New Jersey, New York, Massachusetts. Maryland, Virginia. Illinois. Michigan* Georgia....

Or Thru Your Favorjte Distributor

Crystal change and 1 was talking to K4YMB through the Huntsville repeater. After a short chat, i took a couple of deep breaths from the oxygen cannisler and switched to 16-76, Fortunately there wasn't too much activity, and 1 was able to hear WA90RC in Chicago with a full quieting signal. When I tried to call in, however, I keyed up a multitude of stronger 16-76 repeaters. 52 simplex proved rewarding with contacts to South Carolina, West Virginia, Tennessee and Canada made with ease. After...

Repeater Council Speaks

It ihas been reliably reported that at a recent meettng of a statewide repeater council the repeater groups represented agreed unanimously to keep their repeaters on the air should the FCC deadline of June 30th pass without the new call letters being issued. The identifier would be turned off, but the repeaters would continue. Perhaps it is about time the Commission started reacting reasonably to the needs of amateur radio and stopped 'ts dictatorial stance. I predict that the pressures will...

Amateur Wholesale Electronics

8817 S Hi 29 Te trace, t tm,, Ft 33156 Days 305i 233-3631 W htt Wwk mh f.305 666-134 Here's an example of a sturdy trunk mounting arrangement that avoids the usual rat s nest of wires. to the F2 oscillator tube (or hole in the chassis) will show about 1 cm of threads. The brass slugs will be coming up out of the coil while the iron slugs will go farther into the coil for lower frequencies. These measurements may vary as much as 0.5 cm between different radios, but will serve as a handy starting...

Vdc Power

Use as power pak for mobile riff & many Hiim com )o neuts, other electronic projects. Size B Va tall x 4 w i d e overall x. 2 . Shipped dry, must he filled before use. + Compact Needs only Electrolytic 'HAM' UHF 400 MC HIGH POWER ill TRANSISTORS By RCA or eqnal 2N36S2, NPN. 23 watts, 3 am TO-60 t'aspj with stud mtg VCEV max 65. SN7403 Jga SN7404 g*B SN740S Sin SN7406 SN7407 SN7438 .51 5 5N7*40 .25 0 SN7441 1.30 SN7442 1 13 f SN7443 1.21 I SN7444 1.21 I SN7445 1.50 SN7454 .25 0 SN74S5 .25...

Meter Aircraft Monitor

R 74S TRC-47 single channel AM crystal con trolled 110V 60CPS, pwr supply amp speaker built In, squelch, r-f gain, dual conversion modern design. Size 19' W x 5H x 14D for rack rntg Supplied with schematic amp hookup info. No conversion required, Exl condition 70-100Mc. Single channel. 50 W. output. 110 V, 60 cycle. New and like new. R-19 TRC1 Receiver 49.50 T-14 TRC-1 Transmitter 49.50 FREE schematics. Convertible to 6 or 2 meters, 190-550KC Q-5f r Good Condition Recvr 14,95 or like New...

Appendix Equations

Output resistance of an rf power amplifier Where Ro output resistance in ohms. Vcc dc collector voltage. Vmin minimum instantaneous collector voltage. And Po power output in watts. Vmin is approximately 2 volts for most rf power transistors. It is often ignored in routine calculations, L network equations A Input resistance less than output Xc Routi Rin Rout - Rin 2 B Input resistance greater than output Pi network equations Xcin Rin Q 8 Rout Rin Rout Q2 1 - Kin Rout 9 XI Qx Rin Rin x Rout Xc2...

Dx Representatives

BCN Agencies Pty, Ltd. 178 Coilins Street Melbourne 3(300, Victoria Australia The Wireless institute of Australia 478 Victoria Parade P.O. Box 36 Carlos Rohden Caixa Posal 5004 Sao Paulo, S.P. Brasi Jim Coote 56, Dinsdale Avenue Kings Estate Wallsend Radio Society of Great Britain 35 Doughty Street London WC1N 2AE, England Short Wave Magazine 55 Victoria Street London, SW1, England Irish Radio Transmitters Society 9 Wellington Street, Dun Laioghaire, Eire Sun Electron Corporation 15-20...

Free Coffee Along Highway

Reprinted from Corvaifis GazetteTimes, Corvaifis, Oregon. That Free Coffee sign on weekends at the entrance to the Blalock rest area on Interstate 5 south of Wilsonville can be ignored for only so many trips. Then curiosity wins. And, come to find out, the con> plete project is a volunteer effort by a band of radio hams from the Portland area. They group under the name of Mobile Communications Emergency Unit. What's the idea Because they're a bunch of nuts, the sign says, and the casual host...

Transceiver

Well I see thai good old summertime is around the corner, this means there will be some changes in the bands, and best of all the WX will be right to get your antennas right I t had a very FB looking 4 element, tn band quad, ail put together, boom, elements and all It was just tied down to the bottom of my 150 ft. tower, just high enough to clear the ground, I was trying to get it put on top of my tower and winter WX and a lot of rain and wind stopped me and then it turned cold and winter was...

Meter Fm Transceiver

Supplied with 146,94 simplex, 146.34 .94 (same piug in crystals as SR-C826M) Sensitivity better than 0.4 Meter monitors battery voltage on Current drain 620 ma Tx, Weight 24 oz., less batteries Options Private channel (CTCSS), external micr or mic-speaker, stubby flexible antenna, desk top charger, leather case.

Even Segment Indicator

Scan-Inhibit line to manually select a channel. The channels are scanned when no ground is on the Inhibit line. Many methods are available for reading out the received frequency. In all cases the BCD format must be decoded to the desired output, in Fig, 3a, a BCD to seven segment decoder-driver operates a Numitron or similar seven segment readout device. This will indicate zero th rough seven. A BCD to Nixie decoder-driver could drive a Nixie tube to read one through eight. Alternately a BCD to...

Getting Rich In Amateur Radio

Outside of going on commercial DXpeditions or publishing lucrative ham radio magazines, the main way to make amateur radio pay off is by getting into the manufacturing end. Before you make that down payment on a new yacht, you will have to decide what marvelous product you are going to make and be back ordered on for the next few years. Five kilowatt linear amplifiers might be a good item, except that the CBers would take all you could possibly afford to make and you wouldn't be able to even...

The Rank Amateur

Being a Novice operator is one of the broadest activities in ham radio. One of the problems with writing a column for Novice operators is that most of the ham columns are written for specialty areas tike Oscarr 50 MHz Band, MARS and SSTV, Novices do have one thing in common, We are almost all just beginning. Some of us have worked some DX, but haven't been able to get a QSO yet in the state just next door, Some of us have a code speed just at 5 wpm (unless I here is QRM) and a few of us could...

April Mcmlxxiii

Last February radio and television shows were interrupted with a terse announcement that a plane had crashed into an Alameda CA apartment house. Details were so sketchy as to be non-existent. By 11 p.m. the news reported a Navy jet had screamed into a three-story building with the possibility that none of the occupants had escapedthat dozens may have perished. Alert to the possible need by the American National Red Cross for emergency communications was Charlie Weber WA6RPK, a member of 'The...

Th Rtty Wae Dx Contest

The Deutscher Amateur Radio Club (DARC), has the honor to invite RTTY amateurs all over the world to participate in the 5th RTTY WAE DX Contest. Contest period is Apr, 28, 0000 GMT - Apr. 29, 2400 GMT. Call CQ WAE de , . . on all bands 3.5 through 28 MHz. Exchange QSO-Nr. & RST. Certificates to the highest scorer will be awarded. Logs must contain bands, exchanges sent and received, call signs, QTCs sent and received, points, multiplier. Use a separate log for each band. Enclose a summary sheet...

Cei Standard Time Receiver

Group had been looking for an easy way to have time announcements on the repeater. We wanted an automatic unit that would announce local time. However, the only unit we could find was a receiver with a built in recording that would announce the time when a button was depressed. The unit cost a staggering Si50 and it was subject to error should power fail. A quick telephone call to Hamtronics in Trevose, Penn. gained us the new Caringella STR-1. It s a three channel solid state receiver for 5,...

Phil Mont Goes Fm

The Phif-Mont club, one of the larger in the country, is going FM, starting on 147.03 simplex and installing a Standard repeater for 147-63-03 later on. This should give quite a boost to FM in Philadelphia. When your repeater receives its new WR call, the second thing that you should do after changing the identifier is fill out the above form and mail it to 73. This will enable us to keep our repeater listing current and accurate- It will also make sure that the FM world doesn't forget you ,...

Power Supply

Parts ICXt QX and RX which are not shown in Fig. 3 were added for additional switching. These parts are not required for the standard scanner. Some parts on the schematic are not on this board due to the use of a non-standard IC1. Q3 was mounted sideways in a field replacement of a defective transistor. Interconnecting wiring is on the bottom of the pc board. Here is the completed scanning adaptor as it appears mounted next to its dual voltage power supply. See Fig. 6 for...

Repeater Tome Panel

ALPHA announces its new R CP 780 multi-frequency repeater tone panel for use on community repeater systems, shared base station New from Radio Shack is The Realistic Phone Patch at a price which brings this useful accessory within the reach of any ham's budget. The Phone Patch is priced at 19.95 and comes complete with 15 foot telephone leads, three foot transmitter lead and installation instructions. It features a built-in VU meter, gain control and locking push-totalk bar. It is available at...

Contact Your Distributor Or Write For Data

FEATURES Break - in CW wilh sidetone * Built-in 100 KHz and 25 KHz crystal oscillator * Built - in RIT and RIT indicator light Built - in RTTY frequency shift for FSK Built - in noise blanker * Buill - in VOX Modular construction repair in or out of equipment * RF AGC to prevent front end overload to strong signals Completely solid state except final section 1 KHz readout GENERAL SPECIFICATIONS Frequency Range 2 -30 MHz Amatuer Bands and WWV Mode SSB, CWt or FSK * Power Output 150 watts PEP...

Zed Bllcsky

1701 East-Wesi Highway, Apt. 205 Silver Spring MD 20910 This month I have been taking a look al some foreign ham magazines. These, like Radio Communication from England and Break In from New Zealand, are the foreign amateur radio societies' equivalent of the ARRL publication QST. The sections that make the most interesting reading are the advertise ments, especially when the text is in a strange language. It seems that the Japanese are marketing their wares all over the world. There are plenty...

Communications Corp

213 775-6284 639 North Marine Avenue. Wilmington. California 90744 The RCA insulated and protected dualgate metallic oxide semiconductor field effect transistor type 40841 is quite a device. I don't work for RCA but I am quite fond of their products as you can gather. This device has up to 32 dB gain as an rt amplifier at 44 MHz and is useful up to 500 MHz without neutralization. It also features a low noise figure. In the courst of using them in the rf and mixer stages of a two meter FM...

Waller Electronics Test Equipment Sales

Box 9913, Chevy Chase, Md. 20015 The ' TESCO-PAO has no tuned coils to go off frequency, no tuning necessary or even there it's all in one Black Box LC. ready to go. The TESCQ-PAD has a 1 second hold-up for your transmitter, complete P.T.T, operation, available with dual audio output levels, 12 or 16 tone combinations. (Add 100 for 16 tone version) ( 2.00 m -m - m msm m mi -v (Add 1-00 for postage and handling.) NOW BRUTE FORCE IN A 12V BENCH SUPPLY - THE WALLER 60 AMP 12 VOLT SUPPLY A...

The Rca Cmu Fm Transceiver

The RCA CMU 15 450 transceiver is one of the most common rigs available recently from the commercial surplus market, and is probably the best buy. They are commonly available for less than 20 complete, and their reliability and stability are superior to other rigs of similar age. However, retired equipment is generally not found in good condition, and will require service as well as alignment. To the amateur with limited experience and test equipment, getting one of these monsters to work on...

Desk Calculator

Long having been a big fan of the Monroe calculator to the extent even of having had it at one time mounted in my car for use on rallies it was only a question of time before I got into the new IC powered jobs which are turning up in all of the magazines - including 73. The Heath unit seemed like an excellent way to go, so we tried ihat. You know, it's funny, but you can go along without something for years and never really suffer much - then, suddenly when you get it, you use it every day -...