[Laser] NO RX XE2AT

Tue, 10 Feb 2004 12:51:20 -0500

Yes, good advice. You can also use a darker reflector (50%, 10%, 1% etc) in
testing reciever sensitivity at shorter distances. A dark fabric has low
reflectivity, whereas a "shiny" smooth black surface (like a polished
automobile) will have a spectal reflection.
If you have a compute, then you can run the reciever output into the sound
card to measure the strength of your signal.

good luck and keep experimenting.
walt

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of [email protected]
Sent: Tuesday, February 10, 2004 10:44 AM
To: [email protected]
Subject: Re: [Laser] NO RX XE2AT

In a message dated 2/10/04 2:11:28 PM GMT Standard Time, [email protected]
writes:

> Hi boys yesterday we make some test at 20 miles and after 2 hours we can
> saw
> the both sides of lasers !! was a great experience but NO reception !!!! I
> can see a lot of city lights but no noise beaming the receiver to lights,
I
> am using a 4 inches lens and the Ramsey Electronic Kit.
> The Laser was very strong but I think is the LED on the receiver, What I
can
>
> do ?
> 73 de Al
> XE2AT
>
>

If you can see the lasers then the problem is an insensitive receiver or
inability to point the RX in the right direction. With 2 hours of effort you
were
probably looking in the right place, so my guess is the RX.

To simulate the long distances I aim my laser at a white surface about 400m
away. The return signal I get from that is about the same level as a signal
travelling 25km in free space.  Over 2miles was the laser the brightest
object on
the horizon? or could your receiver have saturated with other brighter
sources?

73

David  G0MRF               www.g0mrf.freeserve.co.uk/laser.htm

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