[Laser] moon repeater

Sat, 03 Jan 2004 23:33:14 -0600

But is there a relatively simple method to determine whether you are 
receiving moon-bounce signals or atmospheric scattering from your outgoing 
beam?

Obviously, pulsed signals with an oscilliscope would be one method since we 
know the rough distance to the moon...but that seems so kludgy.  Ideas?

Jim

>From: [email protected]
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [Laser] moon repeater
>Date: Mon, 15 Dec 2003 19:04:21 EST
>
>In a message dated 12/15/03 9:32:00 PM GMT Standard Time, 
>[email protected]
>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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