73 Amateur Radio Today – May 1991
Issue Contents:
The Copperhead Keyer Paddle
– The perfect touch! …… KI5AZ 9
The Handy Inductance Bridge
– For measuring small coils …… KB4ZGC 11
The Mini-keyer
– A smaller and newer version of an old friend …… WB9YBM 14
Covert Hamming
– A design for your next secret mission …… K6BRP 21
Software for the HamShack Part I
– Useful ham calculations you can program yourself! …… WA4BLC 22
Two QRP Transmitters
– Dust the ethers and bend the waves! …… KI5AZ 26
A Better Tube Tester
– Check more than just DC amplification …… WA1IAO 30
Apartment Antennas: A Challenge
– How to cope with a ess-than-ideal QTH …… W1GV 42
The JPS NIR-10
– Separate the words from the noise …… WB2QLL 34
The J-com MagicNotch Audio Filter
– A little box that locks out lids …… N1GPH 40
The SR3 Simplex Repeater from Brainstorm Engineering
– Versatile store-and-forward voice controller …… WA3USG 46
73 Amateur Radio Today – May 1991
