[Laser] Looking for advice

[KY1K]

Hi Mike,

The designer of the OPT-101 add on was me. I did it without ever 
seeing a Ramsey kit (physically), and submitted it here for comment. 
At the time, there was little interest in it, but several asked for 
the file, a pdf which might or might not have my callsign on it.

XE2AT built and installed the modification on his Ramsey's however, 
and noted it increased the sensitivity enough so that the Ramseys 
could work each other by bouncing signals off of distant walls and 
trees, something the stock Ramsey's wouldn't even start to do. So, we 
know there was a large sensitivity increase.

XE2AT went on to use his modified Ramsey's to work some serious 
DX....not sure of the actual distances worked, but I think it was in 
the 10's of miles range.

I did send the mod to Ramsey along with contact info for XE2AT so 
they could confirm the enhancement worked from him directly.

Never heard anything back from Ramsey, and several messages to XE2AT 
went unanswered, so I'm not sure whether the mod had problems or 
whether it continued to work ok.

Regards,

Art

PS:Please don't post the attachment to the group. While a few might 
appreciate having it, it is just QRM to the vast majority of us.


At 10:48 PM 2/22/2006, you wrote:
>I have the Ramsey laser kit and probably around a year or more ago  someone
>(on this thread I believe) posted a message about a circuit   for a better
>receiver front end.  The circuit uses a TI/Burr-Brown 
>OPT-101  chip.  The OPT-101
>is a photodiode with an onboard current  to voltage converter.  The 
>PDF that I
>have of the mod claims 20-30 dB  enhancement.  I will try to add the PDF to
>this email, I am not sure how it  will work going out to the group.  If it
>doesn't work and someone wants it  email me back and I will send it out
>individually.
>
>MIKE
>KC8SVB
>
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