In a message dated 12/19/02 11:02:04 Central Standard Time, n3ow@rcn.com
writes:
> I am looking for information that i had seen on a website for the
> construction of a COW keying circuit using an opto isolator 4n25 to do the
> keying.
For the lpt port:
http://www.qsl.net/ae0q/contest/opto_key.htm
For a serial port:
http://www.qsl.net/wm2u/psk31.html
There are several others out there. Use shielded cable with these and you
should have 0 RF problems.
73, Don - K4BEV
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