73 Amateur Radio Today – July 1971
Issue Contents:
An IC Audio Processor
– Two IC Project …… W2EEY 16
Audio Signal Generator
– Wein bridge reinvented …… W3SGV 20
Questions Questions Questions
– Answers answers answers …… W9EGQ 24
A Filter Box for CW Ops
– Mind boggling CW selectivity …… K8TSQ 26
Duals
– Think piece for this month. Think! …… WB2PAP 34
Miniature Add-on Oscillator for 2M FM
– Little P.C. unit …… WB6BIH 40
Collinear Gain Antenna for VHF/uHF Repeaters
– Verticle beam antennas? …… K6MVH 42
Invitation to Transmit
– This is women’s lib? …… Thurmond 43
FM Directory
– Everything you always wanted to know …… Staff 49
Desktop Base Stations from Motorola G Strips
– Another FM article in 73? …… W9VZR 56
Camouflage Extra Class
– How to sneak a 40m beam past the XYL …… W4CWB 63
File-box Transistor Beta Tester
– Are your transistors really adequate? …… WB4ITN 66
2 KW From Heath
– Heath does it again! SB-220 …… W6BMK 77
General Class Study Guide
– Part X – The listening post …… Staff 80
73 Amateur Radio Today – July 1971
