73 Amateur Radio Today – May 1973
Issue Contents:
Mobile Burglar Alarm System
– Belt beeping burglar baffler …… WA4SAM 19
The Burst Box
– A real tone-ic for the FMer …… WA7NMO 25
Power Inverter w/sine Wave Output
– For people with short extension cords …… W7OXD 29
450 MHz Preamp
– 10 dB gain on the receiver is a lot easier than on the transmitter …… WB6BIH 33
Roof Mounted VHF Whips
– Phacts and phallacies …… WB6HYD 39
LED Readout Crystal Switch
– Make everyone green with envy …… WA3AJR 47
Voltage limit Sensor
– Car battery warning light …… W4UXJ 53
Build a Digital Clock with 19 inexpensive ICs
– Is that round clock doomed? …… WA6QVQ 55
Portable Use for the HR-2A
– Judi Repeater approves of this …… W2KPE 61
Fixed and Mobile 2m Antennas
– How to make your car look ridiculous …… WB8HEE 63
Two Meter FM Transmitter
– Roll your own …… WB6BIH 65
Mini-repeater Control System Part II
– Have you read the book yet? …… WA0ZHT 71
Audio Boost for Mobile Transceivers
– Mobile audio booster IC …… W2EEY 81
6m 5W Amplifier
– For the kitchen table builder …… K1CLL 83
Hand Transceiver Madness
– Got yours yet? …… W2NSD/1 89
QRP on 180 kHz
– Tried 1700m yet? …… W5SOT 93
Solid State Automobile Burglar Alarm
– Blows horn or siren …… WA1KON 97
Circuits Circuits Circuits
– Keep ’em coming …… WR1AAB 105
73 Amateur Radio Today – May 1973
