Jim,
I run alot of CW contests and with constant CQing/exchanges you could
fry an egg on the heatsink. The existing cooling cannot keep up with
the heat generated. It looks a bit Frankenstein but I mounted (with
double back tape) a 12 volt 2.5" muffin fan on top of the heat sink. It
runs cool as a cucumber now. This is now standard operating procedure
for contests I run at 100w.
Jay - KT5E
Jim Stoneback wrote:
I searched the archives and didn't find anything on this, but from
what I've read, I think I may have a problem with my KPA100. When
operating CW the fan turns on high during every transmission and the
heat sink gets hot to the touch. I'm a ragchewer so my transmissions
do run to several minutes and, regardless of power setting, the fan
will kick on high after several minutes of transmitting. Fan is set
to 'nor'. Sending speed ranges from 15-20 wpm. Ambient temperature
in the shack is around 74F. The fan has never kicked up to high when
on SSB but I don't operate fone much, and generally don't talk for
very long when I do. The K2/100 (recent build, sn 6194, KPA100
Version F1.10) operates well in all other respects. Does anyone have
an idea what may be wrong?
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