[Elecraft] KAT2 Tuner issue (Ant 1 / Ant 2 switching)

[Tim Cook]

I just discovered that I have a problem with my new (to me) K2. It appears
that the antenna switch is stuck on antenna 1.  Switching between Ant 1 and
Antenna 2 with the feedline on Ant 1 doesn't change a thing in terms of
receive signals. The ANT2 indicator turns on when pressing the ANT 1/2 but
in reality it isn't switching. The tuner works fine when on antenna one.
There are no signals received when the feedline is  on Ant 2 and the
indicator for Ant 2 is illuminated.

 

With the tuner out of line (CALP or CALS) and switching antennas I cannot
hear the relay switch between Ant 1 and Ant 2. If I put the tuner in AUTO
and switch between Ant 1 and Ant 2 I can hear the tuner relays switch.

 

Anyone run into this before? I just discovered this late last night and
haven't taken the cover off yet to investigate. In a quick look at the
schematic it looks like relay K18 is what switches the ant ports.  Curious
if this has been mentioned in the past, I did look at the archives and
didn't find anything related to this.

 

Any ideas or suggestions? I plan on taking a look at the tuner today and
maybe check for voltage on K18. Never having worked on a KAT2 I don't know
how difficult this will be to get at. 

 

Thanks

Tim

NZ8J