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Re: Wire Length
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
Original poster: "Gary Peterson" <g.peterson@xxxxxxxxxxxx>
We know that Tesla was using the flat spiral
coil as a spread-spectrum wireless transmitter.
Are you questioning whether Tesla was using the
oscillator as a wireless transmitter, or whether
it was part of a secure wireless system that
depended upon the conjoint action of two
differently tuned RF circuits, both located at
the receiving end, and functioning as an AND logic gate?"
Not at all, but this doesn't meet any
definition of "spread spectrum" which I've ever
seen and the term has been in use in
communications and radar circles for a long
time. Straightforward enough and there have been
many such systems used over the years.
Question referred to spread spectrum.
> . . . Tesla . . . is apparently referring to the two
different frequencies which can be produced
while the primary is being excited.
Tesla is referring to the two different
frequencies that can be produced, one when the
primary is being excited and the other when the primary circuit is open.
"This coil I excited by a primary so proportioned
that when the primary was closed by the make-
and-break disk which discharged the condensers,
the oscillations in the secondary were quickened
much above the rate which the secondary or spiral
vibrated when the primary was opened."
I think this amounts to the same thing but
not so sure as the language seems a bit obscure.
Certainly possible with appropriate tuning which
I think is what he's saying. He was writing a
lot of this at a time when there wasn't really
any standard terminology [generally accepted
engineer slang]. Of course, if the coupling is
high enough, there can be three frequencies
produced, two while the discharger/spark is
conduction and, depending on the tuning, a third
when the primary circuit opens and the secondary
"rings free". I haven't anything he wrote which
make it clear he understood that or not.
"Responding to this post gives me a sense of déjà vu.