Quote:
Originally Posted by Colinaps
Some spark transmitters had an arc sustained by a spinning commutator. They must have generated a modulated tone - to any receiver capable of demodulating it..
73,
Colin.
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ICW (Interrupted Continuous Wave).
Also called "Tonic Train", you see that expression in some early wireless telegraphy legislation. Think about "tonic" in musical rather than a pharmaceutical terms, and it makes more sense.
I see Google is swamped with a couple of radio hams, an electronic music ensemble called Tonic Train. last time I researched it there were only a few hits.