73 Amateur Radio Today – April 19611 Issue
Issue Contents:
Six Meter Nuvistor Converter
– Two 6CW4’s in cascade give a fearfully low noise figure …… K8BYN 9
Power Meter
– Another valuable piece of test gear for the ham shack …… K8ERV 12
Surge Protection in Reverse
– Protect your silicon diode power supply from destruction by shorting …… Pafenberg 13
Let’s Modulate Not Crepitate
– Getting good modulation out of a Heising Modulator …… K4ZGM 14
A New Noise Limiter
– Get out the soldering iron this one’ll go in your receiver …… K5JKX/6 16
Calibration
– Why we haven’t got it how much we need it. And how to get it …… W4WQT 18
Big Cannon
– OK here’s a 20M kW amplifier now stop bothering us for that …… W6VVZ 20
Tennessee Indians
– The public relations side of taming those Indians …… K2SJN 25
Half Wave Feedlines
– One resonant feedline for several bands? Yup …… W9HOV 27
Automation
– You didn’t think we’d pass up April without one feature did you? …… K5JKX/6 28
Audio Boosting the Command Receivers
– Turns out to be ridiculously simple once you know how …… K8HDR 30
Pick Up the Droop
– Your beam been saggy lately? …… W7OE 31
40 Watt Transistor Modulator
– Great for mobile rigs …… KL7DLC 32
Testing the Heath Two’er
– You will no doubt be flabbergasted to find that Don likes the Two’er …… W3UZN 34
RF Noise Suppression
– Technical treatise on how to exorcise the noise demons from your car …… K2TKN 38
432 MHz Transistorized Converter
– Part 2 (ahem) the schematic diagram …… W3HIX 40
Take Your Pick
– Big technical article: IF selectivity and the devious means used to gain it …… Staff 42
Propagation Charts for April
– What time when to where on what bands… Probably …… K2IGY 54
Writing for 73
– How to get rich beyond your wildest dreams …… Staff 56
73 Amateur Radio Today – April 1961 Issue
