Real time active aiming?( was Re: [Laser] Laser comm stuff)

Wed, 23 Jul 2003 04:47:27 EDT

In a message dated 7/23/03 6:58:01 AM GMT Daylight Time, 
[email protected] writes:

> Sure, but the tighter the beam the faster the possible data rate, all
> else being equal.
> _______________________________________________
> 

Well......Almost equal. I found that working a signal from a station using 
beam expanders was much more difficult than a signal with a 1 or 2m Rad 
divergence.  The problem appeared to be scintillation of the beam as it passed through 
the atmosphere. The 'scattering' or 'refraction' caused the narrow beam to 
flutter between no signal and full saturation. While the normal beam rarely 
moved out of the receiver lens.

73

David

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