Re: Tesla coil for wireless data transmission?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Original poster: "Gary Peterson" <g.peterson@xxxxxxxxxxxx>

Ed,

In response to my assertion that, "the World System was designed to 
employ certain spread-spectrum principles, making available the 
shorter wavelength regions of the electromagnetic spectrum." you 
responded with, "Resonance and "spread spectrum" . . . are mutually 
incompatible."

I wish to call your attention to Tesla's 1903 patents "System of 
Signaling" and "Method of Signaling" patents that lay out the basic 
principles of frequency-hopping and frequency-division multiplexing 
in wireless spread spectrum telecommunications.  In order to provide 
greater security he used a wireless signal produced on a multiple of 
frequencies -- the transmitter worked at a number of separate wave 
lengths, like a pipe organ playing a musical chord or, alternatively, 
a specific sequence of notes.  On the receiver side each one of the 
individual frequency components had to be tuned in in order for the 
circuitry to respond.

These patents also describe the electronic AND-gate logic circuit, a 
fundamental element of all present day digital computers.  In fact, 
on the basis of these patents the U.S. Patent Office has asserted 
Tesla's priority for the invention of electronic logic gates in 
general.  See http://www.tfcbooks.com/articles/control.htm for some 
additional words on this subject.

Most sincerely,
Gary Peterson"

   Are you talking about patents 723,188 and 725,605?  Both are 
relevent and both were granted in 1903.  Guess the disparity between 
us here is in the definition of spread specturm as contrasted to 
multiple-frequency modulation of one sort or another; 
frequency-divison multiplexing is a more accurate definition than 
spread spectrum and certainly can use a bank of tuned circuits in 
reception.  The use of a number of different signally frequencies and 
tuned receivers is certainly real enough and was practiced in 
multiplexing telegraph signals by the early 1870's.  That work gave 
the invention of the telephone a boost but doesn't fall into the 
"modern" [by that I mean the buzz words a lot of people use these 
days] definition of SS.  In the context of what I was thinking spread 
spectrum means very wide instantaneous bandwidth of, perhaps, 20% or 
more of the carrier frequency.  Tuned resonators are not useful in 
the reception of that kind of modulation, which usually is carried 
out with a correlation receiver of some sort.
Ed

Ed