73 Amateur Radio Today – December 1972
Issue Contents:
AFSA IV SSTV Analyzer
– Also works for RTTY …… W0LMD 17
Single Conversion 2m FM
– No 455 i-f needed – honest! …… K1CLL 23
Miniature Tone Encoder
– Fits inside the mike …… WA9VGS 29
Tone Burst Decoder
– For repeaters and such …… W3JJU 33
Universal I-f Amplifier
– Like for a 2m panoramic receiver …… DJ1SK 38
Touch-tone Connections
– For repeaters …… K3DSM 43
Simplest Audio IC Yet
– Six parts and a battery! …… W6YBP 49
Using Varactors
– Everything you were afraid to ask …… W2EEY 51
v18 Watts on 2m
– Amplifier for FM …… WB4DBB 63
Sideband Sniffer
– Monitor …… G3OGR 65
Crystal Checker
– Wretched rock detector …… W4AYV 68
10 Amp Power Supply
– Variable yet! …… WB6TOX 73
Using Transmission Line Sections
– Pretty useful actually …… VE4RE 79
Radio Astronomy – Do it yourself
…… WA3CXG 83
Henryometer – In case you’re choked up
…… WA8MLP 88
20m Transverter
– For 75m transceivers …… W9IDP 89
LED Primer
– Expensive Christmas tree lights …… WB6JNI 96
40m FET Preamp
– Hop up a crumby receiver …… W6BLZ 101
Waterproofing
– Liquid plastic system …… W2AOO 104
Super CW Filter
– One IC …… W6AGX 107
Novice VFO for 40 Meters
– The Clapp isn’t all that bad …… W9ZTK 112
New Novice Regulations
– Everybody gets VFO’s …… FCC 129
2m Preamplifier
– FET vs MOSFET? …… W0IPB 134
3rd Party Regulations
– Two and a half pages of No-No’s …… FCC 138
73 Amateur Radio Today – December 1972
