[Laser] daylight receiver

[TWOSIG at aol.com]

Well Andy, how far do you want to talk?

My Ramsey units, which use a phototransistor and a gain of two work several 
hundred feet in daylight.  The active filter probably is not needed on the 
receive side unless you need to cutout the hum from street lights  ( Oh, right.  
The daylight will turn of the streetlights.)

I think what you need to look at is not the detector, but the optics to 
minimize the stray light paths.

Hope this helps.

James
N5GUI


In a message dated 6/9/2004 3:50:35 PM Central Standard Time, 
aflowers at frontiernet.net writes:
Does anyone have a design for a good daylight receiver?  My K3PGP front 
end won't hear much in daylight.  I'm not looking for something that is 
super sensitive--just good enough for a LOS QSO on a sunny afternoon.  I 
was thinking about putting the RX in a black box and using a very small 
lens, thus limiting the amount of total light hitting the surface.  I 
may also try using a low-value resitor on my OPT310 RX to widenthe BW 
and decrease the gain.  Right now it makes a pretty good oscillator if 
you hit it with the laser directly :-)

( and yes, I'm too poor to to afford narrowband filters)

Andy K0SM/2