[CQ-Contest] LPT: KEYING

K4BEV at aol.com K4BEV at aol.com
Thu Dec 19 12:34:36 EST 2002

In a message dated 12/19/02 11:02:04 Central Standard Time, n3ow at rcn.com 

> 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:

For a serial port:

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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