[Laser] Ramsey Kit range

Sun, 9 Nov 2003 19:16:42 -0600

What about using the K3PGP front-end with it?

http://www.k3pgp.org

Just look under his construction link.  Not sure on the bandwidth
capabilities of his circuit, but it is super sensitive.  I have built
his night time receiver.  If his night time receiver does not have
enough bandwidth, I think his day time receiver does though with
increased noise.

73,
Mike
N3YPA/0

> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of Andrew T. 
> Flowers, K0SM
> Sent: Sunday, November 09, 2003 7:01 PM
> To: [email protected]
> Subject: Re: [Laser] Ramsey Kit range
> 
> 
> This reminds me,
> 
> It seems there have been several folks who have put together these 
> ramsey kits.  In fact, Dave and I have had the pleasure of 
> using these 
> kits in a radio contest or two.  Does someone want to find a 
> way to "hot 
> rod" these things to get a little better performance out of them?  It 
> seems to me that someone could come up with a "front end" 
> that beats the 
> heck out of the phototrasistor that comes with it, keping in 
> mind that 
> it needs to have a respose up to over 100KHz or so (it's 
> 18KHz PWM, and 
> you need to resolve the waveform fairly accurately I think).  It's 
> pretty clear to me that most of the light is getting thrown 
> away due to 
> the teeny-tiny active area of those devices.  If someone 
> wants to look 
> at this I can show you a schematic what the RX looks like.  
> It might be 
> a worth doing since many folks seem to be getting interested in laser 
> comm stuff through these kits...and it's also in the a "ham 
> spirit" to 
> figure out how to make a good thing better....
> 
> Andy
> K0SM/2, Rochester NY
> 