[Elecraft] [K2] KPA100 Temp Cal: Room temp or radio temp?

[mjpilgrim]

I have a related question: I purchased my K2/100 only a month ago, second
hand, SN 5818.  I've experienced "PA HOT" shut down on several occasions
when running 100Watts out, and less frequently but it has happened when at
50Watts.  I've witnessed the discussion of setting Cal tPa to ambient temp.
C, and with my indoor/outdoor digital weather monitor on my operating desk,
I see 81 F as a normal workstation temp, which converts to 26.95 C......
that is the figure I enter into the Cal tPa setting.  I can then operate CW
for a few minutes, noticing that the fan does turn on.  Unfortunately, since
I do not continually keep my eyes on the digital display as I continue my CW
qso, I have been frequently surprised to note that I have experienced a Pa
Hot failure and my output has shut down (although the side tone monitor
continues to yield my keyed side tone).  

I have now noticed that when that failure occurs, I can power down the K2
and immediately power it pack on, and I then can continue operating with
full output power.  This almost appears as if the Pa Hot error is a false
indication, and even though it initially shuts down my output power, it
seems strange that it resets to normal ops when power is cycled off and on
again.  I have failed to notice if the fan comes on upon the power off/on
recycle..... I'm thinking it is not on at that time.  I'll try to be more
observant on future failures but in the meantime I wanted to mention this
failure in case I am overlooking something or maybe doing something to
create harm by powering off and on the K2.

PS.  While attempting to change the failing conditions, I have increased the
Cal tPa temp up to as high as 33C, and I believe that is where it was set
with my most recent failure.

Any ideas out there?  Thanks.
Mike, K5MP



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