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Posted by Ed, KI6R on January 23, 2026 at 02:36:25.
In Reply to: VLF communications through earth's crust posted by Glenn on January 22, 2026 at 03:50:51.
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One thing about ground communications that has advantages is that one can find a high power audio amplifier surplus at low cost. It would not be too difficult to generate 500W or so at 8 or 10 kHz into some sort of ground rod system. It would be a fun experiment. How far could a ground current system communicate?
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