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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
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xx   RADIO

A ground communication system. Transmit and receive Morse code and voice signals with this "clandestine" system that uses the earth as the communication medium. Simple accessories convert a 40 watt stereo amplifier into the transmitter.
MODERN ELECTRONICS [2] Sep 1990 (v.7#9) pg. 16