[Elecraft] K2 tx/rx switching problem - help please ;-)

[Vic]

Hi All,

 

I have a K2/100 feeding a KPA100 in an EC2 case. I have a foot switch and cw
paddle connected to the key socket at the rear of the K2.

 

I have a problem with the tx/rx switching. When on cw the tx / rx switching
works just fine, but when  on SSB and I press the footswitch OR key the
paddle OR the PTT switch on the mic socket ,  the K2 switches into tx mode
OK but when I release Ptt switch (any of the three ) the rig returns to rx
but the received volume is severely attenuated. Only careful listening
confirms that it is actually receiving. 

 

I can resolve the issue by repeatedly pressing the PTT switch (any of them)
many times or (oddly) by pressing certain  buttons on the K2 eg Mode , band,
Pre amp, or even turning the power control up or down so it switches the KPA
in or out . Not all buttons clear the issue but most do.

 

I have no idea where to start looking for  the fault and I would be very
grateful for any suggestions of what this might be. I have a suspicion it
may be an Aux Bus issue.

 

I don't think it is a sticky relay as the eventual return to full receive is
not accompanied  by a relay click and anyway I think the entire tx/rx
switching is solid state.

 

Any help or suggestions please. 

 

Replies direct to me if possible , please.

 

Thanks in advance !

 

73,  Vic GW4JUN

 

K21926