Subj : Morse Code
To   : RICHARD BRUMBAUGH
From : STAN PHILLIPS
Date : Mon Sep 04 2000 04:11 pm

RB>  SP> Code is often sent by a light source. (including flashlights)
RB> 
RB> If you have a good STRONG light source, one that reaches the receiving
RB> location you can talk over a light source with voice.  That was
RB> demonstrated to my science class in the 30's.
RB> Of course, that can not be done if the light is very far away, or
RB> weak.

Very good.  With a mechanical modulator (loudspeaker coupled to a
shutter assembly) it worked quite well.   
I suspect that using a laser, long distance communicatons would be possible,

NOW......   That reminded me, years ago (in the 1980's), there was a
report on TV of a laser system transmitting video from the USA to
Canada at Nigara falls. One hotel room to another.  It was being used
to transmit pornographic movies over the border without having to go
through customs (where porn was confisticated).

Regarding the light source, life jackets (for use at sea)
had a mirror and target sight assembly that could be used for
signaling to a search aircraft and could also be used for sending
info using morse code (If I remember, the code was printed on the
back of the mirror).

THe modern jacket transmitter, with a GPS reciever, that sends a
mayday signal to one of the satellites is much better as it is
automatic and does not need any action from the person wearing it
(some do need the antenna to be pulled out).


73  Stan

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