73 Amateur Radio Today – May 1977
Issue Contents:
Build the World’s Simplest Keyer
– uses 555 timers …… Ring 46
Stop That Autostart
– mods for the ST-6 circuit …… WA5EVH 47
Predict the Weather!
– a complete satellite receiver …… WB8DQT 48
Learn A New Language
– try CW …… WB0KTH 52
The History of Ham Radio
– part III …… W9CI 54
The Oily Resistor Watteter
– how to put 20 W into a 1 W resistor …… WA1PDY 57
SSTV Slalom Game
– you don’t need a sports car …… K4TWJ 58
Computer-controlled Thermometer
– take OSCAR’s temp with a micro …… WB9LSS 66
Computerized RTTY Takeover!
– Digital Group cassette to TU conversion …… K7YZZ 70
Let BASIC Control Your Next Contest!
– with Extended Tiny BASIC language …… Whipple 76
Satellite Zapper
– effective antenna for weather birds …… WB8DQT 82
VHF Noise Snooper
– track down annoying pulses …… WA6CLZ 84
Understand Your Pet Rock
– tips on crystal oscillators …… K1CLL 86
TTL Techniques
– bypass those glitches …… WB5IRY 89
Sending HI
– on the hooter …… W8LWS 90
Build a DDRR for Your Mobile
– this one won’t blow off …… W5UKL/0 92
Headphone Jack Adapter
…… WA0VHX 94
Automatic Taping Unit
– for repeaters logging etc …… ZL2AMJ 98
Let’s Use English
– for a change …… WA1GFJ 99
The Ham Radio Classroom
– sure beats study hall …… W4LLR 100
CB to 10 -a Legal Alternative
– part I: bandplan and crystal info …… W4NVH 106
Save Your Old Speakers
– how to remove the beehive …… Miller 109
Beware the Compressor!
– some pitfalls to avoid …… WB5QGI 110
Matching Output Transformers
– sort out unknown impedance taps. …… Miller 111
Stop Timeout!
– build this 10 minute ID timer …… K3VTQ 112
Have You Tried Television?
– it’s easier than you think …… WB4KTY 116
Quick Vertical
– for 20 and 40 …… WB0KTH 117
Try Power Saver Logic
– a guide to CMOS applications …… WB5DEP 118
HF Bands Expander!
– eliminate splatter to gain operating room …… Staff 126
Fight Inflation! Build It Yourself!
– tips on planning construction projects …… W3KBM 144
Wilson HT Mods
– heavy duty p.s. required …… K4MKX 148
Try These IC-230 Mods
– improving a popular transceiver …… WB6GTM 152
CB to 10 -a Legal Alternative
– part II: conversion data …… W6RCL 162
All-electronic SELCAL
– uses a UART for versatility …… WB2MPZ 166
73 Amateur Radio Today – May 1977
