[Laser] Simple data/video transmitter.

[Applied Communications Services Ltd.]

I see a great potential for a transmitting data/video via simple, =
inexpensive laser transmitter for short distances--say up to 1000 ft. A =
number of companies make such systems --the "Canobeam" by Canon, is one =
example.  However, these systems all cost tens of thousands of dollars.  =
I don't see why it shouldn't be possible to build a system using off the =
shelf parts, including laser or IR diodes and IR detectors which could =
mount onto a pair of binoculars or telescope and use a conventional =
video camera set up in parallel for alignment purposes or even for =
signal decoding.  Does anyone out there have any ideas? =20

I have experimented with a IR diode transmitter and IR detector on a =
circuit board, mounted in a piece of 2" plumbing pipe and using IR =
filters and a convex lens.  I transmitted audio using a power line =
wireless Intercom to FM modulate the signal, and achieved distances of =
several hundred feet.  However, alignment was both difficult and =
critical.  Ofcourse, to run video would require a higher bandwidth.  I =
would think too that digital communications would be more effective than =
analog.

Ron  

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