Original poster: "Gary Peterson" <g.peterson@xxxxxxxxxxxx>Wikipedia defines spread spectrum as, "methods in which energy generated at a single frequency is deliberately spread over a wide band of frequencies."
This matches up fairly well with what Tesla was doing in 1898. The "single frequency" is that at which the primary circuit vibrates when energized.
Original poster: Ed Phillips <evp@xxxxxxxxxxx> . . . this doesn't meet any definition of "spread spectrum" which I've ever seen . . .