73 Amateur Radio Today – September 1970
Issue Contents:
Integrated Circuit CW ID Generator
– Automatic identification for your station …… W7PUG 16
Six Volts From Twelve Volts
– Six buck solid state voltage dropper …… K3GSV 26
The Indicating Oscillator
– Another dipper circuit 1-400 MHz …… KH6AF 29
Tuning VHF Receivers
– Clever infinite attenuator and oscillator unit …… K1CLL 32
Code Practice a la Baby Talk
– Everybody’s doing it …… W9PXA 35
Using Those Bargain ICs
– Three testers will test most ICs you will encounter …… WA2IKL 38
Repeater Antenna Separation
– One of the easiest ways to improve repeater range …… K6MVH 45
Diode Stacks
– Replacing those high-power rectifier tubes …… W2BDG 54
Deluxe Receiver Gain Control
– Using one transistor and a zener …… VU2JN 56
A New Approach to Communications Equipment
– A call for manufacturer standardization …… K9ALD 60
Reed Relays for Coaxial Switching
– Work very well for UHF low-power applications …… W7CRV 64
File Box Resistance Decade
– First in a series of file box test gear …… WB4ITN 66
The DyComm VHF-fM RF Amplifier
– Transistorized 15 watts out …… Staff 70
General Class License Study Course
– Part II Alternating Current …… Staff 74
What Really Happened to Hamdom?
– The horrible truth about CB …… W9HBF 82
Beer Can Two-meter Coaxial Antenna
– Drink you way to a good signal …… WA0RWQ/6 86
Converting 24V Relays to 115 VAC
– using a couple of cheap diodes …… Douglas 88
Versatile 2m MOSFET Converter
– Low noise high gain ultra stable …… WB6YVT 90
73 Amateur Radio Today – September 1970
