Editorial By Wayne Gheen

POWER During my recent visit to Los Angeles I talked with K6RAD, Tom Litty, through the PARC repeater and then met him later at a PARC club meeting, Tom, the president of C, T. Power, invited me to stop by and see Iiis operation in Hawthorne where they are making the 2m power amplifiers for FM which Henry Radio is selling under the Tempo brand name. Bright and early the next morning (well, fairly early) I headed for Hawthorne and was talked in by Tom through the repeater and then direct...

Weatherproofed And Dc Powered Through Antenna Cable

Models 101 and 102 only are available enclosed in a die cast weatherproof case for mounting at the antenna in series with the lead-in cable and includes a filter for sending 12 VDC through the cable. Can be used only for receiving unless you put a TR switch at the antenna. Available with your choice of VHF, BNC or type N receptacles. Especially useful for eliminating antenna line loss and thereby improving signal-to-noise ratio of weak signals such as those from weather satellites at 137 MHz....

Teletype Pictures For Sale

Vol 3 S3.50. All for 4.00. Perforated tapes available. 200 different pictures. W9DGV-C. 2210-30th Street, Rock Island Illinois, 61201. ELECTRONIC ORGAN full spinet, transistorized, two manual. SASE for particulars. Lloyd G. Hanson, W9YCB. RR2, Box 52A. Angola IN 46703. GE POCKET MATE. ,94 .94 SI75 Motorola station monitor T1131A with 80 commercial band crystals 200. Bob Hines, 12914-8Sth Ave. N. Largo, Fia. 33542, S 3-392-8642. COLLINS KWM-Z, 516FZ. W NB, Waters...

Never Say

The first issue of 73 was dated October I960, making this our twelfth October issue. Little did 1 expect, back in July 1951 when I mimeographed the first one-page RTTY Bulletin, that it would lead to all this. While visiting Henry Radio a few weeks ago 1 got to talking with Cy Kahn (W6PXH), the Sales Manager, and he suggested that we include a page in 73 now and then which might be removed and used to build a handbook. Many of the foreign amateur magazines do this, so the idea was not difficult...

Relay Operating Supply Voltage

The relay sees supply voltage less all IR drops along the line, and these depend upon current. Each lead of the 4-wire control line will run about 0,3 ohms per hundred feet for copper, 3 ohms per hundred feet for steel wire, in the No. 20 size. And voltage drop along the ground return lead must be estimated on the assumption this lead is carrying all return currents the circuit can develop. Fig. 5, The simplest way to feed a binary coded control signal into our control cable is to use separate...

Zero Dj

Schematic diagram of 0,05-500 mW wattmeter. can be extended greatly by having a switch in this circuit. The 5 m 1W resistor (Fig. 1) should be a noninductive, carbon or metallic film type suitable for rf service. Actually a V2W .05 to 500 milliwattmeter, underside view of completed 4x8 board mounting. type has a little better rf characteristic but no resistor should be used at full rating. This terminating resistor is soldered across the BNC rf input fitting with as short leads as...

Visit To Standard Communications

The simple front of the Standard Communications building in Wilmington, California, gives little hint to the bustling activity inside. Stan Reubenstein, the General Manager, took me on a tour of the plant during my recent visit to the West Coast. Frankly, I was quite impressed. One of the big problems with imported equipment is getting it serviced. Every now and then I remember the Alan Sherman lyric, which ends. If unsatisfactory you should bring it to the factory, but the factory's in Japan...

Reverie Sails

July 3, 197J, was the beginning of a spirited adventure, an idea which had been germinated several years ago hy Tex, K4MJZ (William B. Zamrnit) Often you hear people taik about buying a boat and taking off for a year or so, but how many of these dreams actually materialize Well, in Tex's case they llave. i had the good fortune of meeting Tex several years ago as a result of ham radio, what else 1 can't recount the many pleasant iimes we have had since, in fact every one that has ever been...

Crawford Electronics

The power level that is used is not important and, indeed, for proper adjustment the transmitter output level must be reduced or the rf gain on the cooperating station's receiver turned back to simulate a just barely readable signal. The adjustment process is simple but it does require time and patience. The same number sequence should be repeated by the operator while each one of the two potentiometers of the filter unit is independently adjusted through its...

American Made

It's backed by all these goodies for performance 6 integrated circuits, 21 diodes (23 in base unit), 33 silicon transistors including 2 BET RF power, 2 FETS, 1 unijunction and 28 bipolar. You get handsome, walnut, wood-grain vinyl laminated steel cabinet and no-glare, black face panel with harmonizing, soft gold esthetics and speaker ' 7900 Pendleton Pike Indianapolis, Indiana 46226 American made by Americans at lower than import prices. And its performance is genuine Yankee . . . superior....

Erickson Communications N

Ravenswood, Chicago, III. 60640 334-3200 ELECTRONIC EXCHANGE CO., INC. 608 Papworth Ave., Suite B, Metairie, La. 70006, 834-9000 FRECK RADIO & SUPPLY 38 Blltmore Ave., HARRISON Rt. 110 at Smith, Farmingdale, N.Y 11735 293-7990 8 Barclay St., N.Y. City 227-7922 HAM RADIO CENTER 8342 Olive Blvd., St. Louis, HIRSCH SALES CO. 219 Calif. Dr Williamsville. INDUSTRIAL DISTRIBUTORS 1209 S. Industrial Ave., Dallas,.Texas 75207 742-8570 JRS DISTRIBUTORS 646 W. Market St., York, Penn. 17404 854-8624...

Vertical Ground Planes

With special custom features , . for 150- 170 MHz. Gain 3.4db. compared to wave ground plane. Power Rated 1 KW AM 2 KW P.E.P. SSB. Frequency Range 144 to 148 MHz. with special custom features for 150 to 170 MHz. VSWR 1.5 1 or better at resonance. Diplomat Special Model DI-2A SI 7.95 For complete details, see local authorized Mosley Dealer or write Dept. 142a. 4610 N. LINDBERGH BLVD., BRIDGETON MO. 63044 So, if our receiver stiJJ has a -81 dBm FM improvement threshold, we will have a fade margin...

Linear Amplifiers

Bay 3 -take 10 discount. f'req. Comp 7 0S Dual 709-s Dual 74i'i State case iyle Brand new Spec sheets. Bay 3 -take 10 discount. f'req. Comp 7 0S Dual 709-s Dual 74i'i State case iyle G-E 3.5 W AUDIO IC DIP AMP G-E 3.5 W AUDIO IC DIP AMP Type PA-263, 3.5w cont. duty. 9-to-30v supply. For phono, tape, stereo Type PA-263, 3.5w cont. duty. 9-to-30v supply. For phono, tape, stereo

Repeaters

I have read with interest the many articles featured in your magazine and several times the excellent Repeater Handbook by K6MVH. At this time I have several comments and questions on diverse subjects. First, for your information since November 1 970 we have here in Fredericton an AM repeater VE1PD operational on 147.S00 input and 144.225 output. It gives good coverage to Central and Western New Brunswick and Eastern Maine. It might be some tiling for the DX hounds to look for on inversions, as...

Engwicht Award Announced

The first Harry Engwicht Memorial Award has been presented to Philip E. Deaver, WB6QLZ, of Hay ward, Cal. The scholaiSMip, which is 200 this year, is to be awarded annually to a junior electrical engineering student at San Jose State College on the basis < si scholarship, eligibility to hold an amateur radio license, and membership in the I.E.E.E. The late Harry Engwicht established a radio engineering department at Sari- Jose College in 193'f and taught communication and...

Fm Books

This book is largely a collection from FM iuljelin, edited bv K67MVH and WA8UTB. The material is taken from the editions of February 1967 through February FM REPEATER HANDBOOK K6MVH. Book is required for all repeater operators and must reading for all FM'ers. Only complete book on the subject. It is also one of the best selling books in amateur radio todav. THE BEST OF fm A huge selection of FM Journal's finest technical and conversion articles, never before reprinted in...

The Dycomm Landmobile

An American made FM Transceiver For the amateur who needs quality communications But at a price below the imports - 350.00 10 independent Receive-Transmit Channels, 25W Output. 948-A Avenue E Riviera each FL 33404 305 844-1323 For the radio club publicity chairman this means legwork or landline cails, although the job can be made much simpler if he publicizes his telephone number in the club bulletin so that members automatically call when things happen. After securing the facts, the task is in...

Communications Specialists

W3JJU 377 Rumson Drive Harrisburg PA 1 7104 Perhaps the single most complete piece of gear to invade the junkbox is the standard ac dc five-tube table radio. Millions of these radios have been produced over the years, and they inevitably end up in the junk heap or are presented to the ham by good intentioned friends because they know you like radios. They go bad for any number of reasons, but mainly the problem is failure of tubes, electrolytic capacitors, or the output...

Microwave Passive Repeater

And, since the other path is even longer, it may also be assumed to be far field. At this point, it is necessary to determine the gain of the passive repeater. This may be done either by referring to the curves in Fig. 11, or in the case where curves are not available, the gain of the passive reflector may be calculated. To calculate passive repeater gain, the passive repeater which has the smaller effective area actual area times the cosine of half the larger...

Kaar Dtb Mobile Radio

RF POWER OUTPUT, 120 watts, 6-frequency capability. 148-174 MHz. Brand new, In factory-sealed cartons. In- _ __ 6 - FREQUENCY DECK 39. 150-170 MHz MOBI LE UNITS GENERAL ELECTRIC PROGRESS LINE 14 case, complete accessories, fully vibrator power supply 138. Same as above RX wide band 118. R.C.A. CMC60 B 6 12 volt, 60 watts, 15 0 170 MHz receiver has vibrator, transmitter, dynamotor' power supply, with accessories. R.C.A. CMC60 B 6 12 volt, 60 watts, 15 0 170 MHz receiver has vibrator,...

Newall Solid State Receiver

SELF CONTAINED UNIT 10x121 ix5 These units are Gonset Model 960A and are sold new untuned less crystals. Manuals will be included. No factory warranty. Model 960A-DC 12V DC Si99 Model 960A-AC 117V AC 249 Model 965A Remote Control Head 25 WRITE FOR SPECIAL DEAL ON NEW KAAR 2MHz AM MARINE EQUIPMENT We a so handle dean used equipment. Write for free catalog. Money refunded without question if equip ment is returned within seven days from shipment, undamaged, freight prepaid. Unless otherwise...

Zero

Schematic of milliwattmeter for 10, and 20 dB resistor pads 1W maximum ratings with 50fl impedance values are then cut into the coax line to check calibration points at 144 and at 432 MHz. The maximum errors should be less than 15 and at most frequencies, much less. Fig. 2. Schematic of milliwattmeter for 10, and 20 dB resistor pads 1W maximum ratings with 50fl impedance values are then cut into the coax line to check calibration points at 144 and at 432 MHz. The maximum errors should...

Swan Swan Swan

PauJ K, Page J K1KKA 4 Roberts Road Thompsonville CT 0S0S2 If you own a Swan 350 or are thinking of purchasing one on the used market, the ideas put forth in the following article should be of interest to you. Briefly, it is a summary of modifications I have made to my Swan 350, some of which take only moments, others which take an hour or two, but none of which are very difficult. I've had my Swan 350 since December 1966, when I purchased it oh my last trip to the famed Radio Row section of...

Pagel Electronics

This 30 x 48 passive repeater operates in the 6.7 GHz industrial band, providing service for a commercial microwave system. Installed in Alaska, the passive repeater, with 118.0 dB gain, receives the signal from a station 7 miies away and redirects it to the far station more than 48 miles further on. The system carries 300 voice channels with a measured fade margin of 40 dB. repeater cannot be used. This meant that the configuration of Fig. 3E, with a product of 13.2 16.7 220.4, wouldn't work....

Double Passive Repeater

To determine Fresnel zone radius we apply 2280 V 1.777 x 10 4 2280 .0143 32.6 ft for the radius of the first Fresnel zone under the conditions outlined above. Now, if we were to construct a reflector with a radius of 32.6 ft, we would find that we are intercepting all of the radiated energy that has a positive phase relationship and redirecting it in similar phase. Therefore, we are effectively increasing our power gain by a theoretical 6 dB. See Fig. 4. In practice it will be more...

Linear Amp

3 pc. set includes 709 op amp, 710 hi-speed diff. comparator, 711 dual comparator flat pak case. With spec, sheets. GIANT SALE ON NEW TTL TEXAS ft NATIONAL ICs SN7400N Quad NAND sate . . . . .45 SN7401N Open coil, out .45 SN7402N Quad NOR Bate .45 5N7410N Triple 3 in. gate 4s SN7420N Dual 4 In. Kate 45 SN7430N S Input sate 45 5N7440N Dual 1 in. buffer 45 SN7441N BCD-Nixie driver . . . .1.95 SN7473N Dual J-K flip flop .SB SN7474N Dual D flip flop 88 SN747SN Quad lotoh 1.49 SN7476N Dual J-K nip...

Tempo Ct High Power Vhf Meter Amplifiers Compact And Handsome

The CT 1002-2 Operates directly from a 12 VDC power source. Antenna switching is automatic when as little as 1.5 watts of RF drive is applied. The amplifier incorporates Balanced Emitter transistors and state of the art design practices, making it virtually immune to destruction due to high VSWR or mlsloading conditions. It may be used anywhere in the 2 meter band without the necessity of retuning. Only 93 e x 4 x 3, the CT 1002-2 can be installed almost anyplace. Since there are no switches...

W

One of the most distinctive types of simple cards is the caricature card - either humorously done like that in the W2NSD card or more accurately done as in the W2LFL QSL. With some thought and planning, a caricature, your call, the report, and your QTH caii appear on one side of the card. Of course it helps to know a friendly artist who would like the instant notoriety resulting from designing a ham QSL The QSL from W2LFL was picked up on a recent visit to Bud. A...

Tempo Ct Tr

The Tempo CT220 TR FM AM transceiver is a truly unique, top quality little giant offering features never before offered in any unit at this price. Only 179.00 Truly mobile, the Tempo fmp-3 watt portable gives amateurs 3 watts, or a battery saving V2 watt, FM talk power anyplace at anytime. With a leather cariying case included, this little transceiver will operate in the field, in a car, or at home with an accessory AC power supply. The battery pack is of course included only 225.00 TEMPO CT...

Washington Tower Case

Sequence of events 7-3-70 WA7GQC applied for building permit to City of Everett lt WA for erection of 90 ft ham tower and beam. Denied because of 35 ft zoning restriction. 7-17-70 Applied for variance to exceed 35 ft. restriction. 8-3-70 Board ot Adjustment postponed decision. WA7GQC hired attorney. 9-14-70 Variance denied. Neighbors objected, height not necessary, unsightly. 9-15-70 Requested reconsideration. 10-5-70 Variance denied. 35 ft limitation is not undue hardship on hams. 10-15-70...

Handmike

Rugged, heavy-duty carbon handmike with press-to-talk switch. Equipped with 4-ft cord amp phone plug. SPECIAL NEW, boxed Each 1.88 2 for 3.25 ARC-5 T-23 TRANSMITTER 100-156 Mc including tubes 2-S32Aa 2-1625. crystal NEW Used, less Mounts in 2-1 8 hole. Flange diameter 2-5 8. Two scales 0 15 and 0 600. Calibrated for use on steel panel. Standard brand. SPECIAL NEW, boxed Each 1.75 2 for 3.00 RAY-3 NAVY RECEIVER Crystal controlled superhLt with dyn. power supply. Audio system designed for...

Sonar Radio Corporation

Y. 11207 Please send information on Model FM 3601. Dept , short amount of time involved, but they had not yet invented radar Giving his demonstration at the Roya Institute in London, Lodge said of radiation, Here is a great one, giving waves of 30 meters long 10 MHz radiating Vhile it lasts with an activity of 100 hp, and making 10,000,000 complete electric vibrations per second. Its great radiating power damps it down very rapidly so that it does not make more...

Simpson M Fm For Sale

Type accepted, solid state, 5 channels, 8W out, .2juV receiver. T. McLaughlin, WB4NEX. C. Box 622, North Manchester, Indiana 46962. ELIGIBLE VETERANS build and keep a 25-inch Heath solid state color TV as part of a Bell amp Howell De-VRY home study course. G1 Bill pays 100 of the course and kits costs. Contact Bill Welsh W6DDB1. 234 S. Orchard, Burbank, Calif. 91506. GALAXY FM-210 w Power Supply, Mobile Bracket, Three Sets Xtals. Unit has all engineering changes, will not drift, i 165.00. P.O....