[Laser] Air Transmission Properties

[John Schnurer]

	Dear Group,

	To learn about S/N... begin with how you intend to modulate the
signal....and go to ARRL Handbook.  AM will mostly be noisier than FM...
	And things can get very clever from there.

							JH

On Tue, 11 Feb 2003, n9jim-6 wrote:

> and HiTran.. available on line somewhere... cd is free.
> 
> someother stuff here:
> http://www.qsl.net/wb9ajz/laser/laser-prop.html
> 
> n9jim/6
> 
> 
> J. Forster wrote:
> 
> >There were programs calles NASTRAN and LOWTRAN  years ago, but  don't know about
> >their recent history.
> >-John
> >
> >David D. Rea wrote:
> >
> >  
> >
> >>Good morning all,
> >>
> >>I've been working on a point-to-point laser system for mountaintop DX
> >>class work for about a year now, and as part of an independent study for
> >>school I need to model the system. I need to characterize air as an
> >>optical transmission medium - I'd like to find some equations that
> >>relate wavelength, dewpoint and distance to absolute optical
> >>attenuation. Additionally, I need to create a noise characterization
> >>based on levels of ambient light measured at the detector, so that I can
> >>come up with an overall equation for SNR.
> >>
> >>Can anyone suggest some reference materials for obtaining these
> >>relations?
> >>
> >>Thanks and 73
> >>Dave KB2YQE
> >>
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> >>    
> >>
> >
> >
> >
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> >  
> >
> 
> 
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