[Laser] Ramsey ? xe2at

Wed, 07 May 2003 11:07:23 -0400

Hello Al--good to see you here...

I also have a pair of the ramsey kits.  From what I can see, the ramsey 
receiver uses a phototransistor for detection.  You might consider 
replacing this with a quality PIN photodiode to obtain better 
weak-signal sensitivity...Has anyone tried this?  The kits use 
pulse-width modulation of a 16 KHz carrier, and this may not be the best 
thing for extrememly weak signals either.

You will definately need lenses to work over any long distances.  Bigger 
lenses focus more light onto the detector.  I'm sure you can get several 
miles out of these ramsey kits with a good set of lenses, especially at 
night.

Andy K0SM/2

Alvaro de Leon wrote:

>Hi boys , I did buy a Ramsey kit for a laser communications and I would like to know if this kit is good for 40 miles QSOs with
> a magnifier lens..
>Thanks in advance
>Best regards
>73 de Al
>XE2AT
>
>---------------------------
>Aguascalientes, Ags. Mex.
>http://www.xe2crh.ampr.org
>         DL81uv
>
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