Transceivers

Box 6527 Raleigh NC 27608 Canadian Marconi Co. Marine & Land Com. Div. 2442 Trenton Ave. Montreal 16 P.Q. Canada E. T. Clegg Associates, Inc. (69) Lit tell Road E. Hanover NJ 07936 Communication Company, Inc. P.O. Box 520 Coral Gables FL 33134 R. L. Drake Co. (Cover IV) 540 Richard St. Miamisburg OH 45342 Dumont Communications 78 Hammarlund Drive Mars HiH NC 28754 Galaxy Electronics 10 South 34th St. Council Bluffs IA 51501 Henry Radio (Tempo) (19) 1 1 240 W. Olympic Blvd. Box 64398 Los...

Info

Save a Total of 14.67 the one with GUTS The First First-Class Listening Post At a Really Affordable Price talk pretty good. This was acoustic duality you had to holler into the can and poke one ear into it alternately. At the transmitting end, sound waves vibrated the string, and at the receiver, the string vibrated the diaphragm, which was the bottom of the can, making sound waves again. To get back to aiming your TV antenna One of the very best methods is to run a pair of wires up to your...

Specifications

Frequency Coverage 144 148 MHz Dimensions 6WWx2WH x9D without tray Weight 5 lbs. Microphone Controlled Magnetic Antenna Impedance 50 ohms RECEIVER Sensitivity At least 0.5 iV for 20 db Quieting, 0.35 iiV for 12 db Sinad Selectivity 16 KHz 3 db Freq. Tolerance .001 from 30C to 60 C Spurious Rejection At least 60 db Audio Power 2 W. w less than 10 distortion Squelch Range 0.2 0.8 u, Intermediate Freq. 10.7 MHz & 455 KHz TRANSMITTER Emission 16F3 (Frequency-Modulated) Freq. Tolerance .0005 from...

Crystals

Kansas City KS 66102 A mateur Bomar Crystal Co. 20 I Blackford Ave. Middlesex NJ 08846 Amateur International Crystal* 1 0 N. Lee Oklahoma City OK 73102 Commercial & Amateur Jan Crystals (82) 2400 Crystal Dr. Fort Myers FL 33901 A mateur K-W Industries* Box 508 Prague OK 74864 Amateur Midwest Crystal 1516 Parkwood Rd. Cleveland OH 44107 Amateur Savoy Electronics Box 7127 Fort Lauderdale FL 33304 Amateur Sentry Manufacturing* (Cover II) Crystal Park Chickasha OK 73018...

Ox Stuff

CUSTOM MADE DX CHARTS When you need a DX bearing you need it immediately. You don't want to have to look it up on a map or fiddle with a globe. These Custom DX Charts arc computer printouts for your exact shack location and give the bearing and mileage for every country in the world. They are printed out by call prefix for speed of location ana the capital city is indicated. A HAMSHACK WITHOUT A GLOBE RIDICULOUS Particularly when these fabulous Hammond globes (the best in the biz) are available...

Contents

16 An IC Audio 20 Audio Signal 24 Questions, Questions, Questions W9EGQ 26 A Filter Box for CW Ops KSTSQ 34 40 Miniature Add On Oscillator for 2m FM WB6BIH 42 Col linear Gain Antenna for VHF UHF Repeaters K6MVH 43 invitation to 49 FM Directory Everything you always wanted to know. 56 Desktop Base Stations from Motorola G Strips W9VZR 63 Camouflage Extra Class W4CWB How to sneak a 40m beam past the XYL. 66 File-Box Transistor Beta Tester WB4ITN Are your transistors really adequate 77 2 KW From...

Laboratories

TV And Communications Antennas Since 1921 Asbury Park, New Jersey 07712 201-775-7252 175.00 355.00 39.95 59.00 63.95 resonant frequency of the filter may be altered. Voltage ratings of the components are not important in this circuit. Receiver audio voltage never will approach usual component ratings. Capacitors may be disk ceramic or any other type found in the junkbox or surplus electronics store. If size is no object, an economical substitute for the two O.SjUF capacitors is a surplus double...

Nevada

The Annual Sierra hamfest will be held on Saturday, Aug. 14, at the California Bldg. in Idlewild Park, Reno, Nevada, contact with KQ0NEB during the fair week will count for points in the QSO party, regardless of whether it is during the QSO party. The scoring foT working KQtjINEB as follows 10 points each contact, each mode. Also count as a separate multiplier. If KQ0NEB is worked at least once on four separate bands, add 1000 points to total score. Certificates will be issued to the high score...

Detector Output The Larger Output Controls The System

Balanced or an unbalanced type of microphone input. The former can be quite useful since by having both microphone leads ungrounded, many problems with noise pickup, rf pickup, etc. on the microphone leads are automatically avoided. If the usual type of unbalanced input is used, however, it is connected to pin 5 of the SL630 via a 1 jF capacitor. Pin 6 is then left unconnected. The capacitor between pins 3 and 4 of the SL630 provides a high-frequency rolloff characteristic. The values shown...

Editorial By Wayne Green

You can get a Fine little FM ng and you are on the an through the local repealers. You can use it in the car, at home, at work, or even in a boat. More and more hand units are coming out, too. While not too many of lis can plunk down a long one for a sideband station, two short ones aren't all that hard to come by. While I may be patting 73 on the back more than it deserves, I do note that a little over a year ago there were only a couple of FM rigs available and today there are over a dozen...

Amplifier

Balanced Modulator Sideband Filter

Typical SSB transmitter consists of sideband generator, provisions for changing output frequency, and linear amplifiers. See Figs. 6 and 7 for details of sideband generators. typical SSB transmitter, contrasted with that of a typical AM transmitter. The difference in complexity is obvious. In the SBB transmitter, the audio is applied to a sideband generator stage where it is converted to an rf signal which reproduces the audio at some radio frequency, This is done by a variation of the...

Aquisition

Instrument Flight Research, Wichita, Kanscs, has been acquired by Regency Electronics of Indianapolis, Indiana. Floyd 0. Ritter, Regency president, said the purchase was consummated by exchange of Regency stock for all assets and business of the IFR company. IFR manufactures aviation electronics test equipment. Regency Aviation Division marketing officials, who will assume IFR sales responsibility, state that combining the two companies should result in great sales efficiency for both firms....

Rd Cw Inking Recorder

Uses standard 3 R tape. 11 Sv iOHz, Great for making visual copy of CW. Used Good S 1 25. TV-1 OH Tube Tester 65.00. Mike Tewksbury, Box 8324, Norfolk VA 23503. VHF SELLOUT Ameco TX 62 S89 C.onset GC105 69 Johnson 6N2 Transmitter 69 Swan 250C TV2B I 17CX S549 Swan TV2B New S229. More llcms. Get Complete Listing. Stan Burghardt W UT, Box 73, Watertown SD 5720 . MANUALS - 6.50 each R-390 URR, SP-600JX, CV-591A URR, URM-25D, LM-21, URT-7, BC-639A, UPM-45, UPN-12, FR-S U, FR-38 U....

I

It certainly is easy for me to sympathize with people who write in telling me of their repeater problems. Perhaps a better word would be empathize, I've installed a number of repeuteis over the past few years and I've never unleashed one yet without controversy, complaint, and hard feelings on the part of at least a vociferous handful, Here in New England there are dozens of repeaters operating successfully but the road to success was rocky indeed for virtually all of them. The W1ALE repeater,...

Po Box Riviera Beach

Delivers SO Watts of Punch on 2 Meter FM The Varitronics PA-50A is a completely solid state Class C RF amplifier designed specifically for use in mobile amateur FM applications. Internal RF switching makes the PA-50A useable with any amateur FM transceiver with 10 watts output. Balanced emitter devices are employed which are completely insensitive to high VSWR or even no load conditions at its output. This handsome and ruggedly built amplifier is styled like the IC-2F transceiver, features a...

Sentry

If you haven't already received a copy of our NEW 1971 Catalog of Precision Quam Crystals S Electronics for the Communications Industry, Somewhere along the line, in virtually every ham repeater in the world, you'll find a couple of Sentry crystals. Repeater owners and FM old-timers don't take chances with frequency-they can't afford to. A lot of repeater users depend on a receiver to be on frequency, rock stable in the dead of winter or the middle of July. The repeater crowd took a tip from...

Antenna Noise Bridge

Higher frequency range amateur radio gear including the popular 2m 'FM systems - can now be tested for resonant frequency and operation impedance with the Omega-t Systems Extended Range Antenna Noise Bridge. The unit combines precision and measurement flexibility normally found only in a collection of expensive laboratory equipment, according to Jack Finney of Omega-t Systems. We have previously developed a lower range antenna noise bridge, and now we are moving into high frequencies, he said....

Realistic Transmitter

GAINS Johnson Valiants S89 Johnson Factory Wired Valiant with Johnson SSB Adaptor SI89 Many More. Get Complete Listing. Stan Burghardt W01T, Box 73, Watertown SD 57201. MILITARY SURPLUS. 12PDT 24V dual 400 ohm coil,.relay 95 . Silicon dielectric grease 8 oz. tube. Si .45. 10 pound surplus assortment, 4.00. All new and postpaid USA. Catalog on request. Electronic Systems. P.O. Box 206, New Egypt NJ 08533. MECHANICAL FILTERS 455 Khz Center Frequency. 2.1 Khz. SIS.95. 300 Hz ,522.95. J.A....

Balun

TYPICAL TELREX MONO-BAND ANTENNAS 15M31 7 - Monarch, 10 DBD, 3 EL, 4 KWP, 2-1 2 O.D, 17' boom 20M326 - Monarch, 10 DBD, 3 El., 8 KWP, 3-1 2 O.D, 26' boom 2M609 - Monarch, 14 DSD, 6 El., 6 KWP, 1 O.D, 9' boom 2M814 - Monarch, 16 DBD, S El., .8 KWP, f .375 O.D, 14' boom 6M516 - Monarch, 13 DBD, 5 El., .8 KWP, t.5 O.D, 16' boom and many, many more send for PL-71 D ept. C