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A Digital RF DataLink
Wire is a wonderful thing. There’s not much that is more reliable than a short piece of stranded or solid copper wire between the ends of an electrical connection. However, there are situations where electrically tying devices together with long runs of wire is impractical. Light does a good job of replacing copper when the conditions are right, but if one needs to move electrons reliably over a relatively long distance there’s no better conductor than the Earth’s magnetic field...
SERVO Magazine (October 2008)
By
Fred Eady
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