73 Amateur Radio Today – April 1972
Issue Contents:
200 Watt 2m Amplifier
– Now you can be unpopular in six counties …… W4RIZ 17
Using the Drake TR-22
– Does more than DU2 …… W4FQM/l 25
An Auto-bandwidth Selector Unit
– Using two ICs …… W2EEY 27
“Break”
– A typical day on 2m FM …… K1NUN/1 31
AFSK-mCW-cPO IC
– Prizes if you can translate that …… K9MRL 36
Using the LM373
– I-f amplifier IC projects …… K4DHC 37
Repeater Site Alarm
– Hear your gear being stolen or vandalized …… K6MVH 45
T44 Base Station Conversion
– Getting on 450 MHz for $30-$50 …… K0MOC 49
The HR-2 as a Base Station
– Power supply deviation meter etc …… WB6BHI 51
FM Repeater Guide
– World’s most complete list of repeaters …… Staff 55
Electronic Symbols & Abbreviations
– Just what you’ve always wanted to know …… Staff 86
73 Tests the Comcraft
– Tunable receiver shakes FMers to core …… W2NSD/l 93
The Florida Repeater Mess
– Bad but California leads again …… WA4RLG 95
Ross & White Transceiver
– With tone burst built in yet …… W4FQM/l 99
Ionospheric Effects of Thunderstorms
– Perturbations occur …… WN5COZ 101
FM as seen by
– If the shoe fits …… W6EIF/4 104
Circuits Circuits Circuits
– Build build build…… Staff 107
Extra Class Questions and Answers
– Are you ready for the $9 questions? …… Staff 109
Poor Man’s FM Base Station
– Is FM for under $75 low enough? …… WA4UZM 117
73 Amateur Radio Today – April 1972
