[Laser] My first outdoor test, 200m

[Garnier Yves]

Good start Paolo
Red light as a very weak loss/Km: well under 0,1 dB/km
with clear conditions.
http://f1avyopto.wifeo.com/images/ind3.jpg
Of course you have to remove -6dB dispersion loss each
time you double the link length. If you can loss 50 dB
I calculated you could go to about 40 km.
73 Yves F1AVY
http://f1avyopto.wifeo.com

--- Paolo Cravero <pcravero at as2594.net> a écrit :

> Hello.
> Finally last night electrical and optical parts of
> my light TX-RX system could 
> meet. The test was MCW over a bit more that 200m LOS
> path in urban 
> environment. Nothing special, but we could prove
> that "the thing" works.
> 
> I've published a couple of pictures and screenshots
> here
> http://ik1zyw.blogspot.com/search/label/optical (top
> post for the time being).
> 
> Now we are looking for a longer distance path.
> 
> Given last night results, I can probably add as much
> as 50dB of loss until the 
> signal becomes unusable. Am I right assuming that in
> normal clear air, red 
> light has about 1dB/km of attenuation?
> 
> 73 de
> Paolo IK1ZYW
> 
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Yves F1AVY
http://f1avyopto.wifeo.com