Re: Wire Length

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>


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."

   The Wikipedia definition is incomplete in that it implies that 
the only way to generate a spread spectrum signal is to modulate a 
single frequency one.  That's not necessarily true as there are other 
ways to generate a "wide band of frequencies" - filtering and 
modulating of a random noise signal is example with which I'm familiar

   Tesla was using a narrow band transmitter and receiver for each 
of his frequencies and correlating the outputs to decide whether or 
not a [two tone] signal was present.  Two (or several for that 
matter) relatively narrow band signals don't equal a "wide band of 
frequencies".

Ed