I would suspect a bad relay associated the 40m lowpass filter -- or a bad solder connection to one of those relays.

73, Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco

On 21/06/2024 3:55 pm, Jos Weitenberg wrote:
I have the following problem with my K2, when I switch on the K2,
sometimes the 40m band is deaf. If I then switch to 30m and back to
40m, the reception is good again. Or if I switch on the transmitter
in the 40m and go back to reception, the reception is normal again.
Does anyone have any idea where I should look for this?

73’s Jos pa3hgx

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