[Elecraft] K2 'CAL TPA' setting maxed out

[Jim KO5V]

Good Evening,

As I was talking on 20M SSB tonight, my K2/100 started to get a bit twitchy when I transmitted. The power was set to just below 100W. I started seeing an intermittent 'High Current' error message, which then changed to a constant 'Hot PA' error. I have an intermittent RFI problem on 20M (which I thought I had solved), so that might have returned and caused this problem.

I tried matching the antenna with the KAT100. It would not arrive at any solution - there were no relays clicking. I had to press the 'tune' button again to stop it. Toggling the power on the rig made no difference.

So I searched the list's archives, and found a thread where Don mentioned the 'CAL TPA' menu. I found that it was at its maximum setting of 150C - I have set this parameter twice since building the radio 7 years ago. Resetting it to about room temp fixed the problem, and the radio now behaves normally. I also checked "CAL Cur", and it's still set to 3.50.

So, it is working again, but why did the 'CAL TPA' setting go to it's max? Is there a known problem? Maybe it's a glitch from the RFI, but I thought I should ask just in case there is something else I should check.

Thanks. 73,

Jim KO5V
Cedar Crest, NM