First Choice Among The Nation S Am A Teurs
E. F. JOHNSON COMPANY WASECA, MINNESOTA 1379 East 15th Street C nntonfc V lume Number 12 Silicon Rectifiers Cnm WI0OP 6 How not to pop 'em, a lesson for haras and engineers alike, Tuning Bypass Condensers j m Kyle K5JKX 6 8 How to make a bypass bypass at the VHF's. Simplescope p erQQ W0QPA 10 Perchance the titie may give this one away. You need one. Build it VFO Chirp VS 6AU6 Al Brogdon K3KMO 20 Several VFO's use a 6AU6. Lousy choice, try a 6AH6 instead and see. Conso,e Dassow W9H KA 22 If...
IK Hvf
A transistor will handle a surprising amount of current between emitter and collector while in the saturated condition since the internal resistance is low and the dissipated power is therefore low. The dissipated power is also low in the cut-off condition, where the resistance becomes relatively high and the current through the transistor becomes Trr shouldn't happen to a dog but it does happen to electronic components and assemblies that go into military equipment. I refer to the inhuman...
Info Qam
3.5 mc 7.0 me 14.0 mc 21.0 me 28.0 mc 52.5 imc 147.0 mc 220.5 mc 224.0 mc Vhe Pi output circuit A, above has practically supplanted its predecessor the parallel tuned circuit in modern day ham transmitters, and is so-called because of its resemblance to the 16th letter of the Greek alphabet, r. The Collins Radio Company is generally given credit for first making extensive use of it and indeed it is still referred to in some quarters as the Collins coupler. The circuit can be redrawn as in B....
FEATURES Axr
Completely self-contained, including VFO and pow er supply 115 vac Single-knob band-switching on 10-15-20-40-80 meter bands Plate power input 120 watts CW 80 waits Phone AM Time-proven reliable 807fs parallel final amplifier Oscillator cathode keying with c amp tube key-up protection Temperature-compensated VFO accurately caitbra ted on all five bands. VFO three-crystal selector switch Pi-network output matches 30 to 1000-ohm loads Buift with high-quality, conservatively-fated components...
Tvfm Sweep Generator
LAB fc TV 5 L OSCILLOSCOPE 5 PUSH-PULL OSCILLOSCOPE 425 Kit 44.95 Wired 79.95 Send free Catalog amp name of neighborhood distributor. Send free Short Course for Novice License, Send 36-page STEREO HI-FI GUIDE 25c enclosed for postage ci amp handling. ENGINEERS Excellent career opportunities in creative electronics design. Write to the Chief Engineer TV 1 ANY hams and engineers that I know are mad at silicon power rectifier diodes. They tried them once and the results were disastrous, The...
Info Bqa
All crystals for amateurs are sei at 20 ramfd. hermetically sealed with pins optional .050 CR-1 .093 FT-241 3 .125 HC-6 y2 Citizens Band transmitter crystals in stock for the following equipment JR-800, 761A, CD1, GW10, CD5, CD100, CD100A. TR330, C27, AT20, Messenger, MK7, 112700, TR910, 27C2, ED27, CRU7, CDD5, CT1, RP115, CD27, TECT. Guaranteed .004 of nominal 3.00.
Simolescope
Do you have to ask others 'How's rny modulation Do you have to wonder if you are modulating 100 Do you know how much hum you have If your speech clipper is clipping If you have enough drive If you aren't sure of your phone signals, AM or SSB, build the Simplescope and find out The name Simplescope comes because this is as simple as an oscilloscope circuit can get and still monitor AM, DSB, and SSB signals. I do not claim that this 'scope does a perfect job, or that it cannot be improved. My...
William H Roberts
put will be somewhere near 50 mc. A fifth-overtone 50-mc crystal, on the other hand, will give output right at 50 mc but if operated at its fundamental will only be somewhere near 10 inc. Now, hack to the series-mode circuits. Remember, they operate at the fundamental or the fifth or seventh overtones equally well, depending1 entirely on circuit constants. One of the simplest series-mcde circuits was developed by Butler and is described in Edson's Vacuum Tube Oscillators as The Ground-ed-Grid...
HAWAII Kvq
David A. Brown K21GY 30 Lambert Avenue Farmingdale, N, Y. For the DX propagation chart, I have listed the HBF which is the best Ham Band Frequency to be used for the time periods given. A higher HBF will not work and a lowe HBF sometimes will work, hut not nearly as well. The time is in GMT, not local time. Fair 4-5, 21-24, 27-29 Bad 1-3, 25-26, 30
Ebco Manufacturing Co
Box 895, Los Amigos Station, Downey,, California Box 416, Village Station, Warren, Michigan Box 23, Stoneham 80, Massachusetts Complete with brackets for in tower mounting Worm cut into large, one-piece steel jack shaft. thick gear welded to main shaft and specially hobbed. No keys, no screws, no pins to work loose. High strength rotor withstands 12,000 inch pounds. Absolutely will not drift or prnwheel in high wind. High torque, V H. P. custom built G. E- motor, 1 Yg R, P. M turning speed,...
Bibliography
American Raiiio Relay League, The Radio AmuLeur's Handbook. EL B. liiett, W8CBM, KM and TV Interference on the VHF bands, CQ, December, 1957, page 46. Warren H. Clark, WGCOK, Crystal Frequency Comparator, QSTt December, 1959 page 63. Buchanan. John P., Handbook of Piezoelectric Crystals for Radio Equipment Designers, WADC Technical Report 56 156, October, 1956 available through the Office of Technical Services, U. S. Department of Commerce, Washington 25, D, C-, for 7 00 . William A, ErlsoiiP...
Tdq Watt Meter Transmitter
At fastt we got tmI The ones the VHP boys haw been cryinu for for two years, and at x i tbe pric many foavs boon sold for Complete One of tb most versatile high power AM transmitters available Ng conwrsion required. Manufactured by RCA Separate modular Power Supply, RF and Modulato sections. Excellent eonditi amp n. Final uses 829B driven by 8BB. MOV GO cycles. Like Wow THIS IS IT Rob us at only., 89,50 MOBILE RADIOTELEPHONE i 50 - J 70 mc FM 6 input. Output 2S watts. Consists of Transmitter...