[Elecraft] K2 key autodetect problems

[Victor Rosenthal 4X6GP]

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