[Laser] 850 nm APD, free

[Art]

Hi Everyone,

Some number of years ago, someone on this list gave me an 850 nm laser 
repeater consisting of a fiber optic input receiver (APD) and an LED 
transmitter (also fiber optic).

My interest has grown away from wideband and high speed communication via 
laser, so I don't need this anymore. If anyone wants it, it's theirs for 
the price of shipping.

The APD needs a 300 volt bias supply, it's not included. It's fully 
documented with large schematics. On the front panel, there are 2 fiber 
optic ports labelled receiver and transmitter. On the back panel, there is 
a db 25 pin connector. It is called a 'repeater', which I think takes the 
signal, cleans it up and re-transmits it making longer distance fiber optic 
links possible. It is made by Artel Communications, circa 1988 (according 
to the documentation).

The transmitter board has a 20.832 Mhz crystal on it, which appears to be 
the frequency the data is modulated on.

Anyway, the tx/rx assy and the docs are available to anyone who wants to 
pay postage. Please reply off-list.

Art