[Elecraft] K2 almost deaf on 40 meters only

[Stan AE7UT]

I just recently noticed I can barely hear S9 signal on my K2.
I checked with my XG3 and on all the other bands I get an S9 signal with the
-73 dBm
level but on 40 it gives an S1 reading.

This is a K2 I bought 2nd hand while I'm building my own.
It has a DSP in it and as far as I can tell it has the same settings on all
bands.

How would I go about diagnosing this problem?
It was working about a week ago.  This is my main CW machine.

Thanks
73 Stan AE7UT






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