Richard Harrison wrote:
Jim Pennino wrote:
"The invention of spread spectrum is generally credited to George
Antheil and Hedy Lamarr (yes the actress) and their patent of 1942."

Yes, I believe Lamarr and her husband encoded several tones in sequence
using a player-piano roll. The system was used in WW-2. Poor old Tesla
only invented the a.c. power system, wireless power transmission, and
demonstrated his remote control of a boat using spread spectrum to avoid
interference more than 40 years before Hedy Lamarr`s patent. T.A. Edison
did his best to deny Tesla credit for anything. That`s commerce.

Best regards, Richard Harrison, KB5WZI

George Antheil and Hedy Lamarr were never married. Antheil was a
neighbor.

The didn't encode "serveral tones in sequence on a player-piano roll",
they used a piano roll to produce frequency hopping between 88 different
frequencies with the intention of making radio guides torpedoes hard
to detect or jam.

The first practical use (after technology caught up with the concept)
was by the Navy during a blockade of Cuba in 1962 based on the work
started in 1957 by Sylvania Electronic Systems.

While Tesla and several Europeans had their fingers in various frequency
hopping schemes, the general consensus is that Antheil and Lamarr were
the first originators of the basis for spread spectrum radio systems as
used today.

Both Antheil and Lamarr were given a special award in 1997 in recognition
of that fact.

Other than that, you mostly got it right.



--
Jim Pennino

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