73 Amateur Radio Today – February 1973
Issue Contents:
PC-iC-iD
– For FM- RTTY- /m- etc …… K2OAW 27
The Evolution of Spectrum Management
– Radio Club of America Talk …… W4BW 31
Phased Lock Loop Decoder
– For continuous tone systems …… WB6BIH 36
Toroidal Quadreture Antenna
– New wideband antenna …… W4KAE 40
Active Filter Applications
– RTTY …… W1SNN 45
Frequency Measuring System -iI
– Design theory and clock …… K5DUS 49
Repeater Keying Line Control
– Squelch tail and time-out …… WB6BIH 60
SSTV Circuits
– A raft of popular circuits …… W9NTP 63
Two Meter Converter
– For a BC FM receiver …… WB6CDU 80
All Purpose Metering Circuit
– Use one meter for the whole rig …… WA0ABI 83
Are FET’s Really Biased?
– Understanding FET’s …… K9VMH 86
If Your Counter Input’s Low
– Here’s an IC way to go …… K4EOE 89
TR-22 Modification
– For higher output power …… W8FJA 91
Transistor RF Power Amplifiers
– Theory – Part I …… W9EGQ 97
Light Bulb Power Indicators
– El cheapo …… WB2GQY 102
Economy Filters for 75A4
– Still an excellent receiver …… W0IQI 105
Capacity Measurement
– By frequency shift …… W3HTF 108
Keyer Adaptor
– For outdated transmitters …… W1JSS 116
Gonset Linear Modification
– Gonset 201 ……W6HGX 118
A Time for Everything
– A discussion of time …… WB6KFI 125
IC Protection
– Second guess your power supply …… W4ATE 142
73 Amateur Radio Today – February 1973
