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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