[Laser] Re : NLOS contact

[riese-k3djc at juno.com]

whats the status o using the extremely high power ultra blue laser
friend of mine has one and is fraid of turning it on
it will heat a spot on your hand in just a few seconds
I suspect they may not be entirely legal

Bob K3DJC
On Fri, 4 Feb 2011 17:16:26 +0000 (GMT) Garnier Yves <f1avy at yahoo.fr>
writes:
> Hi Stuart
> Direct forward scatter via Rayleigh scattering seems to me very 
> difficult with a red or an infrared laser in clear air conditions.
> We never succeed with it.
> It's quite possible with an hazy sky and a very flat TX RX aiming 
> axes angle via the Mie scattering effect.
> In fact that is very similar the cloud bounce way ! 
> Rayleigh scattering could be very strong by clear sky with a blue 
> laser.
> A blue sensitive photomultiplier tube at the RX side could be a good 
> choice.
> But...this link could be under the 10 Km range because the blue 
> diffusing air effect will produce also a strong propagation loss in 
> the laser beam.
> Many experiments to do...?  
> 73
> Yves F1AVY
> http://f1avyopto.wifeo.com
> 
> 
> --- En date de : Ven 4.2.11, I <stuart.wisher at talktalk.net> a 
> écrit :
> 
> > De: I <stuart.wisher at talktalk.net>
> > Objet: [Laser] NLOS contact
> > À: laser at mailman.qth.net
> > Date: Vendredi 4 février 2011, 13h47
> > 
> > Thanks for the links Yves,
> > 
> > 
> > 
> > All your contacts seem to be by reflection, whether off
> > mountains, clouds or meadows. My modest contact was by
> > forward scatter since we could not find a reflecting site
> > between us.
> > Have you tried contacts by scatter? I could not get all
> > your info to load and translate so I am unaware if you have
> > tried this mode.
> > Maybe we will try this again by cloudbounce after reading
> > of your excellent results using that mode.
> > As I mentioned, I have a 200mW red laser so we will try for
> > a contact with a coherent signal next
> > 
> > 
> > Regards,
> > 
> > 
> > Stuart G8CYW
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> 
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