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
