73 Amateur Radio Today – May 1971
Issue Contents:
A Big Signal on 75M Mobile
– Only 54″ long! …… W6MOG 14
A Dual Gate FET Preamp for 2 Meters
– Do it yourself preamp for those too lazy to buy …… WB6BIH 20
A Neat and Novel Receiver Accessory
– 73 finally invents the crystal calibrator …… WA6CPP 24
The Hartley Oscillator Story
– Invented in 1914 and still with us …… K2SKV 28
The Widening World of Instant Replay
– To videotape or not to videotape …… Staff 30
Design Concepts for Low-power Amplifiers
– Using some new transistors …… Campbell Westlake 36
The Price of 10 Extra Feet
– An epic in trivia …… K9PYY 39
A Transistorized 10 Meter DSB Transmitter
– Four transistor rig …… K4EPI 40
Reviewing the 1971 Radio Amateurs Handbook
– It’s okay …… WB2MYU 42
On the Spot
– Report on LaBalsa ham-raft …… VK4SS 46
FM Walkie-talkie Transceiver Directory
– Prediction: Walkie-talkies will be very popular …… Ralston 52
Advanced Preamp Compressor Clipper
– Can also be used by Generals …… VE3GSP 56
The transistorized LM Freq Meter
– 1971-izing this WWII goody …… W5SOT 60
Ham Radio the Bible and Peru
– Ham radio in the interior …… OA8V 66
450 Remote Site Transmitter
– Solid-state rig …… WA1HVG 69
The S-derived Filter
– For cw audio filtering …… W3KBM 74
Electronic Health
– A cure for cancer? …… Moore 76
Experimenter’s One-tube $10 2-meter Transceiver
– If you like tubes …… W9HBF 78
Questions Questions Questions
– And answers …… W9EGQ/kHD6961 80
Understanding Your Amateur Radio Operator
– XYL’s ham dictionary …… WA6JLJ 82
High Power Surplus for 2M FM
– Very reasonably priced dB’s …… K6MVH 85
Evaluation of Swan’s 6 and 2 Meter Antennas
– They work good …… WA6CPP 90
General Class Study Course: Part VIII
– Transmitters …… Staff 94
73 Amateur Radio Today – May 1971
