Re: Keying interface for PC

Johnny AC0BQ

Gm Jim 
I have to agree with Wayne.
Great Job!
I have been trying to figure out how to key my radio with the N3FJP software.

Now I need to get busy and build one!!

Johnny ACØBQ 

On Fri, Sep 25, 2020 at 10:49 AM n5ib_2 <n5ib@...> wrote:
A few days ago I was reading Terry's (WA0ITP) description of a keying interface he made in order to use N3FJP contest and general logging software to send CW . His interface connected to a PC's printer port.


With the demise of real serial ports and printer port on laptops, I decided to make an interface using a USB to serial adapter module that I had on hand. As long as it brought out the needed modem control lines (RTS in this case) it ought to work. I made a quick toner transfer PC board, and exercised my recently acquired 3D printer to make an enclosure.

Attached is a PDF document of the project. It works fine - and just in time to get ready for November Sweepstakes.

Additional support information can be found at  <>


Jim, N5IB

Check out the 4SQRP website at

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