Tag Archives: circuit

Build a Computer to CW Interface

Using a  well-known circuit, I show you how to build a simple computer interface so  your logging software can send CW through your radio.

The logging software simulates someone using a straight key.  It changes the voltage on an RS-232 pin and the electronic circuit uses a transistor as a switch, grounding the lines as though someone grounded the contacts of a straight key.

This interface will let you work a contest or pile-up using your logging software – without having to use a key or paddle.

The circuit diagram: http://www.n3fjp.com/cwschematic.html

N3FJP website: http://www.n3fjp.com

Tripp-Lite USB to Serial Converter: See it on Amazon.com