[Elecraft] Heat related issue

[Steve L.]

WB7FJG and N4SL activated their club call, W7MRG for
the Bumblebee event as BB #46.

We hiked to a local bird sanctuary in Snohomish, WA
and shot up an 88' CF doublet sloper with the two ends
at 80' and 60'. Only worked 20m as the other bands
were dead up here.

We used a K2 and 5A-hr battery with the internal
autotuner which, as always, worked freakin' GREAT!

However, it was *hot* outside and the sun was hitting
the K2's case until you could NOT place your hand on
it - very hot!
After an hour or so, everytime I sent anything using
the built-in memory keyer, there was a loud CLICK in
the headset/speaker about 250mS after the last
character was sent. This didn't occur when using the
internal keyer and a paddle, it did occur even when in
TEST mode, transmitting no power output. T-R was set
to 0.01. Also, when tuning, as the frequency was
changed from 140xx.30 to 140xx.31 (in either
direction) there was a loud click. Right on 14.060
there was very loud key-down signal with some
warbling.

When I got home, the radio once again worked perfectly
as it always has before, so I'm certain this was an
excessive heat issue (I've always used a tent or shade
before).

So, anyone else ever have this, is there some known
thing I can change to 'fix' this 'problem'? It's
SN4272 with all mods I know about in place (it's the
K2/100 when in the main shack, the QRP with the ATU
when a field unit). Just curious.

72, Steve N4SL

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