Does it happen when the paddle is NOT plugged in? If not, suspect the paddle jack.
FWIW, I also used this method to allow the K2 to be keyed by the N1MM program. I mounted the diodes on the control board of the K2 and brought out the keying line via the ALC pin on the DE9 connector, since I never use ALC. My K2-to-computer cable has the DTR line connected to the (formerly) ALC pin, and I set N1MM to key it via DTR.
Anyway, I never had any trouble with this system. I think I used Schottky diodes which had a somewhat lower forward voltage.
73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO http://www.qsl.net/k2vco/ On 27 Mar 2018 21:36, Chip Stratton wrote:
I have the external circuit using two diodes to allow the K2 to detect when a straight key is used instead of the paddles. Occasionally with the paddle plugged in but not keyed, the K2 will spontaneously start sending a string of dashes. This will terminate, sometimes only briefly, when I do key the paddle. It happens even when K2 transmit power is turned all the way down, and I've never had trouble with RF in the shack. Both diodes test fine, at 0.64V drop forward, and no detectable leakage reverse. The paddle also tests fine, both lines open when it isn't being keyed, and likewise the autodetect box shows no shorts to the ohmmeter. Ideas? 73 Chip AE5KA
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