73 Amateur Radio Today – September 1971
Issue Contents:
Transformerless Power Supplies
– Theory and six practical circuits …… K3SVC 14
Build a Solid-state Module TV Camera
– And amaze your friends …… W0KYQ 18
An Experimenter’s Guide to IC Substitution
– Getting HEP to IC’s …… K5JKX 28
Microwaves and Microsounds
– How to see underwater ….. K1CLL 38
RF Power Measurement with Hot Carrier Diodes
– Rf wattmeters for up to 450 MHz …… W6AJF 42
IC/photocell Compressor/aGC Unit
– With no noise buildup problems …… W2EEY 47
The Theft Stopper
– Booby trap for the car …… K4EPI 52
A Marketing Man’s Approach to Ham Radio
– Ham radio is a product …… WB8CDU 53
Multi-channel Operation with the Motorola HT-200
– HT-200 modification …… K8YQH 59
Facsimile for the Radio Amateur: Part II
– Scan this thriller continued from last month …… Dean 66
Man-made Interference
– Its causes and cures …… WB5DEP 78
A Linear Stable VFO
– Better a VFO than a UFO …… W8RHR 86
General Class Study Guide XII
– Some general questions on TVI etc …… Staff 89
Effective Heat Sinking
– Preventing fried germaniums and silicons …… K5ZBA 101
The Spider
– Interfacing your transceiver and linear …… W4RIZ 104
“Say Coo Say Coo Day Eckees”
– Some hams don’t speak English …… W7OXD 107
An IC Pulser for the Amateur Experimenter
– For the many unpulsed IC’s around …… W6GXN 112
A DC Isolator for Phone Lines
– Keep out of trouble …… Weinstein 117
New Hope for Learning the Code
– Learn the code in two hours …… WA1KWJ 119
73 Tests the Gonset Super Scan Receiver
– Minding 8 FM channels at once almost …… W2NSD 122
New Mark Products $30 Battery-boost Regulator
– Works from 11 volts up …… Brown 124
73 Amateur Radio Today – September 1971
