Radio Amateur 02-1972

International Crystal

International Crystal Oscillator

Since I have been building some kind of solid-stale unit such as an i-f amplifier, an rf power stage, a solid-state X-band oscillator, etc., at an average of about one a week, I appreciate an organization that is marketing kits for us amateurs in a sensible fashion. Frankly the prices don't appear sensible, being much, much too low For 2,95 you get a complete crystal oscillator kit 3 60 MHz . You doni get the crystal at that price, but you do get the transistor, and the oscillator works right...

Transceiver

Gonset Comunicator Schematic

A detail discussion of module circuitry, circuit improvements, transceiver packaging and operating experiences. When the Ten-Tec series of low-power transceiver modules appeared on the market, I purchased them more out of curiosity than with any great expectations that lliey would he very useful, I his thinking goes back to about 1950 when my large 100W rig became inoperative, leaving only a 3 V vfo exciter available for QSOs, I had so much fun with the 3W rie on 40 and 20 CW that there...

Tone Burst Encoder

Fone burst activated repeaters no longer pose an entry problem to walkie-talkie Owners who have the Ross and White model TE P tone burst encoder This is a single tone encoder that is field adjustable from 1700 to 2500 Hi. Since most handheld units are ultra-compact, R & W will handle the installation for a fee, setting the freq to your request. Drop a line to Ross and While at 50 W Dundee Rd.t Wheeling IL 60090 und tell them what you have so they can quote you a price for the Unit and Hams from...

Light Emitting Diodes

S ,68 2 for 51.45 Jumbo. TO-l.fi, 2 lead* fed l.OO 2 for 1.75 703 RF IF, 14 hookups* TO-5 7 IOC Differential Amp*** . . . ED 7 11C Memory, Sense, Amp*** 723A Voltage Regulator (DIP) TVR 2000 Hi.power 723 (DIP) 74 1 C Freq. Comp. 709-** . , . 748C Freq. Adjustable 741***. ) 7 09-709 Dual 709'i (DIP) 741 741 Dual 741's (DIP) 749-749 Stereo Preamp (DIP J AMATEUR*' 400 MC NPN HI-POWER TRANSISTOR TO-60 case. Similar to 2N3G32 t 400 mc, 3 amps, 0 bvcho, 100 Me 23 watts,...

Standard Src-146 Transceiver

Standard Src146

Crystal Park, Cfricfcosha, Oklahoma 7301S PHONE 405-224-6780 TWX 910 830-6925 tern is omnidirectional. Radiation from this antenna is vertically polarized. Finally, the quarter-wave antenna is the shortest conductor which can he used as a resonant antenna any shorter structures must he loaded to an electrical quarter-wave in order to achieve resonance. General course, part XI 2Z What is TV 19 J low can it be remedied if the amateur station is at fault If the TV receiver is at fault TVI stands...

Vhf Dummy Load Wattmeter

Wattmeter Parts

The active vhf amateur often has need of some type of dummy load for transmitter checkouts. The units found in amateur applications range from the Bird Termaline units costing around S350, downward through the Waters units, through the Heathkit Can-tenna. to the inexpensive units described in the various amateur publications.1 The Bird and Waters units have the advantage of a direct readout wattmeter movement, whereas the cheaper units are dummy loads only. A dummy ioad serves as a constant...

For The Newcomer

To get a repeater site 'how to build a repeater how to keep a repeater on the air ho .' to determine a prQsoe T've repeater's range how to get your repeater license The Handbook contains 208 pages of useful, harchto-come-by .information, and it's written in an interesting, personal view by Ken W. Sessions, Jr, (K6MVH) former editor of FM Journal, now managing editor of 73, Littie refugee with the dust of the volcano on her face. their small farms with only a few belongings over their shoulders....

Caveat Emptor

Price 2 per 25 words for non commercial ads M per 2 5 words for business ventures. No display ads or ii encydiiiCQunU Include your chtek with order. Deadline for uds is the 1st of the month two months prior to publication, For example January ,1st is ihe deadline for the March issue which will be mailed on the 10th of February. Type copy Phrase and punctuate exactly as you wish it to appear. No all-capital ads. We will be the judge of suitability of ads. Our responsibility for errou extends onI...

Help Stamp Out Mental Health

From May 14-21, 1972 the Barry College of Further Education Radio Society will be comme mo rating the 75th anniversary of the Bristol Channel Tests undertaken by Marconi and Kemp in May 1897. They will be establishing stations at Flatolm Island GB3BCT and Lavernoek Point GB3MKT . The 1897 tests were significant in that radio signals were transmitted for the first time across water, radio signals were transmitted for the first time between two countries, and these were the last tests carried out...

Repeater Update

Interesting note Varitronics transmit crystals can be used in the Regency HR2, With this change, the 73 Varitronics crystal becomes Regency 76, the 91 Varitronics becomes 94 Regency . . . MI WB8CSC UBSCQS K VLN MN K0RTU NM WA5QLZ San Bernardino Mtiv H 34 h5 Merrill Isfcwd 28-8H formerlv 34-76 Streaked Min (B cktiddi 34- 4 (Delete WlQXR, W1FFF ) Ann Arbor Detroit PL J 00 Hz Detroit PL 100 Hz Elk River II.8 Alfcuquerqut* Boston 44

Editorial By Wayne Green

How many of you who have read the EA1 proposal prefer it to the hobby class license proposal which would still permit amateurs to use the entire One of the EIA manufacturers has announced a massive CB mobile antenna which is guaranteed noi to burn out in CB installations. We would like lo do some picture stories oil the various aspects of amateur radio and would like to have some good illustrations. We would like to have some good up-to-date illustrations fo...

Marco Amateur Radio

Jerome Hurwitz W3EZT, was in iiis Silver Spring shack on Novembei 1-when he heard a distress call from Venezuela The South American was in dire need of a special medicine l or a two-month-old hoy in Caracas. Jerome, an engineer by profession, served as a relay between the State and Defense Departments, Panama, and Caracas. Within 24 hours, the medicine was safely on Lis way to Venezuela from New York. Although this is not the usual substance of ham radio, emergencies such as this do occur and...

North Tucker Shawnee Ok

Range switch is used, it will be necessary to calibrate for each switch position. Also, if multi-band use is expected, the graphs must be made for each band. Use of the wattmeter now requires only the connection to the transmitter, setting of range switch to the proper level, and reading the graph. The uses of this dummy load-wattmeter are as varied as the amateur mind can devise. One very important use is determining the losses of 50 ohm coax. Measure the output of the transmitter at the...

K4-506 Transistor

Code practice osciJiator or perhaps a noisy alarm for the homet boat or car, Circuit courtesy Calectro Handbook ( .50, GC Electronics, 400 S. Wyman, Rockford IL 61101). NPlST transistor is a CaJecrro K4*506, Two osciiJator circuits for aligning receivers, anonymously presentedf originally, in FM BuJ etin, VoU, No. 5, June 1967, reprinted in 73's FM AnihoJogy V available from 73 Magazine for 3,00.

The Gonset Communicator

The Communicator has been the most popular two meter transmitter-receiver of all time. But it is an AM rig and two meters is now almost exclusively F l, Palo mar Engineers' nev. Frequency Modulator puts rhe Communicator on FM without any modification or rewiring. The microphone plugs into the Frequency Modulator. One of the cables coming out of the Modulator plugs into the Communicator's microphone jack and carries the push-to-talk line. A second cable lias the crystal plug which plugs into any...

Fully Solid State Fm

132 to 172 MHz 1 WATT OUTPUT 1 2 MICRO-VOLT SENSITIVITY High Performance, completely self-contained two-way FM radio. Compact, lightweight, easily operated and hand-carried. Housed in high-impact 2-section case, All external hardware polished stainless steel. Includes rechargeable nickel cadmium battery pack and charger Lots of 5 less 10 . . , ea. Lots of 10 less 15 , . ea. Proper chargers available separately. 15 each. More than 15,000 units in stock . . . send for new 1972 catalog.

General Notes On Schematic

ALL FIXED RESISTORS ARE 1 4 WATT COMPOSITION .001 AND 01 CAPACITORS ARE DISC CERAMIC CAPACITORS MARKED SM ARE SILVER MICA Rl AND R2 STANDARD CARBON ELEMENT POTENTIOMETERS C2,C3, AND C4 ARE ELECTROLYTICS-25WVDC OR MORE Inward the front near the center frequency capacitor. The board is supported on I pacers from the top of the minibox. The plug-in coils are wound on plastic coil forms I used pill hollies 7 8 inch in diameter. Winding data is given in the table-After the turns have been adjusted...

Amateur Radio Advanced Class License Study Guide I

A The Novice Class License Study Guide has not yet been published in 73 or in any other magazine. This book contains all the basic technical information need to pass the Novice License with flying colors. , .and ts invaluable as a basic text for understanding the General Class Study Guide. Profusely illustrated and so clearly written that just reading it is enough to permit most applicants to pass their exam. S3,95 value. B The 73 General Ciass Study Guide has helped thousands to easily pass...

Sweep Generator Frequency Vs Varicap Sias

Find some way to vary the dc potential across the varicap repetitively. The schematic diagram is shown in Fig- 3. Q1 is a unijunction transistor relaxation oscillator that generates a sawtooth waveform. I his sawtooth is used to provide the voltage variation across the varicap to provide the sweep function. The potentiometer R1 sets the sweep speed and can adjust the sweep rate from under one sweep per second up to about 50 sweeps per second. The sawtooth from the unijunction is coupled into Q2...

Hot Off The Press

Order today ONLY 1,50 postpaid 73 Magazine Peterborough NH 03458 1,50 enclosed for one copy of the ATLAS. 10.00 enclosed for 10 copies of the ATLAS (club special). Heavy wires between the shield and the bandswitch help to maintain a solid ground and also serve to add support to the switch, overcome this, put a 20 pF mica between pin 8 of V7 and ground (Fig. 5 L No more oscillator malfunction If you look at the chassis photo, you will notice the corners are darkened. This is from brazing to...

Fair Radio Sales

EUREKA - Box 1105 * UMA, OHIO 45802 HERE IT IS . , one complete U.S. Callbook and one complete OX Callbook per year and no change in price. In addition you can keep your CALL-BOOKS up-to-date through 3 subscription to the new Service Edition Series published each March 1, June 1 and September 1 each one covering new licenses and all activity during the preceding quarter, Annual subscription to complete Winter CALL-BOOKS plus 3 Service Editions only 14.95 postpaid for the U.S. and 11,45...

Jefftronics

4252 Pearf Rd Cleveland, OH 44109 don't hesitate to substitute. If you use Its, stay with D1 L or RTL, whichever you start with, right on through, for they don't work loo well when you mix them up, I he oscillator and divider 1 used for speed control is a bit unusual, bui I had the cards and it was simply a matter of expediency that I used them rather than devise another type such as unijunction - to use for a clock. The same goes for the monitor oscillator (Fig. 19), If you decide to use micro...