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Старый 25.01.2018, 20:58
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1942 Ground Current Communication

The first ideas started to trickle in 75 years ago this month in the April 1942 issue, and some of the first experiments focused on ground current communications. Leslie C. Merrill, W1NEI reported his preliminary results with the schematic shown above. The receiver consisted of the audio section of his receiver, and the transmitter consisted of the venerable spark coil from a Model T.

From the transmitter, the signal was fed to ground rods three feet apart. At the receiving end, the ground rods were only two feet apart. Despite the close spacing, he was able to copy the signal fifty feet away.

Merrill reported that he lived out in the country, and had the possibility to space ground rods 3/8 mile apart. By extrapolating his initial results, he speculated that a range of 30 miles might be possible with a similarly equipped station at the other end. [Ссылки могут видеть только зарегистрированные пользователи]
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