73 Amateur Radio Today – March 1981

73 Amateur Radio Today – March 1981

Issue Contents:

The ZL/dF Special

– your next T-hunt could be a hare-raising experience …… AD6Z 40

A 49-mHz Repeater?

– fun project …… KL7GLK 44

TR-7400 Behind Bars

– something new in S-meters …… WB3ATP 46

The Last PL Generator

– this synthesized unit is the last one you’ll ever need …… WB2BWJ 50

An End to Repeater Time-outs

– with the IC-211 …… VP2EZ 53

The History of Ham Radio

– part XII …… W9CI 54

Half a Loaf

– charger for 6-volt batteries …… Nordgren 60

The Great Aluminum Cover-up

– how to paint the stuff …… WB0YTH 62

Home-brew X-band Wavemeter

– indispensable test gear for microwave mavens …… W1SNN 64

The Real-world Connection

– add up to four I/o ports to your TRS-80 …… K6EW 68

Practical Af and Rf Speech Processing

– using modern ICs …… Staff 72

LOR: A Light-operated Relay

– handy circuit has many uses …… PY2AUC 76

The Calibrator Gater

– so you can find yourself …… WB5PPV 78

The Flexi-plane Antenna

– this “scrawny ducky” will boost your HT’s signal …… N1PL 80

CB to 10… and Beyond

– getting excited at 432 …… WB3CDE 84

Three-way Power Supply

– ideal for CMOS TTL op-amp projects …… W3HB 86

Home-brew in the Real World

– victim tells all …… WB1GVU 87

DXing the Past

– a visit to Signal Hill …… VE3CXL 88

73 Amateur Radio Today – March 1981

Return to 73 Amateur Radio Today Index


Loading

Leave a Reply