On 7/2/2023 7:54 AM, Christian Friess wrote:
I don't own a K4. But my experience let me bet "RF got into a cable".
I wonder what power you are using.

There is a SCREAMING Pin One Problem at the connector for the paddle and/or the key. From what I can discern from Elecraft's response, it is the result of the availability of the connectors, and circuitry to detect the presence of a connector being inserted. It may also be present at other rear panel connectors. I experienced it here the first time I fired up on 10M, with the TX antenna on a 120 ft tower 100 ft from the shack. I wound ferrite chokes onto those cables and to others at the rear panel.

73, Jim K9YC




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