[Laser] moon repeater

[laser@mailman.qth.net]

In a message dated 12/15/03 9:32:00 PM GMT Standard Time, toasty256@yahoo.com 
writes:

> I was wondering if anyone has tried using the Apollo
> retroreflectors with low power lasers in combination
> with the 20 hz QRSS type modulation? Since that seems
> to be the cutting edge of weak signal tech these days.
> Even though it would only be usefull for hearing your
> own signals i suppose.
> 
> 

This could be a very good idea. 
I have used slow CW to make many QSOs on the LF bands ( 73kHz and 136kHz) and 
it's a technique that works well.
I guess some further questions would be:
1) Over what distance on the earths surface would the reflected laser be 
visible?
I'm not at all sure of what happens to the divergence of a laser after it 
encounters a retroreflector?
2) although we can modulate audio onto the laser by chopping it with an 
accurate source what happens with doppler as the relative distance changes? I guess 
that the carrier changes wavelength but does the modulation? Possibly it does 
too, which would be a problem for very narrow bandwidth reception.

Probably still need a few Watts.

73

David   G0MRF


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