It also is fairly sensitive to how tightly enclosed your KPA500 is in
your station equipment configuration. Mine came on high-fan often when
on RTTY, or [fruitlessly] calling CQ in SS CW on Sun. I finally moved
it out of it's "cubbyhole" under the shelf assembly, and it stayed on
low fan all the time, which I couldn't hear with the cans on.
For my K2/100, the heat sink got very hot with repeated [unanswered]
CQ's and on RTTY. I mounted a computer fan on top of the heatsink with
a tab of velcro, blowing down. Heat sink stayed cool to the touch with
80-90 W on RTTY. I am repeatedly amazed by thermodynamics. [:-)
Fred K6DGW
Sparks NV DM09dn
Washoe County
--Northern California Contest Club
--CU in the Cal QSO Party
--7-8 Oct 2017
On 1/8/2017 5:10 PM, Don Wilhelm wrote:
Mike,
The efficiency will very from band to band, and is also somewhat
dependent on the SWR it is working into.
I would not think it is a problem - that is what the high speed fan is
supposed to do, cool it with faster air, even if that is disconcerting.
A lot depends on your transmit vs. receive time intervals may be.
There are a whole lot of dependencies.
73,
Don W3FPR
On 1/8/2017 7:44 PM, W0MU Mike Fatchett wrote:
I was running the RTTY contest this weekend and expected to see higher
than normal temps but on 20m and maybe 15 the amp was running 65c and up
where the highest speed fan would come on. Generally in RTTY I would up
the normal fan a couple of notches and it would be fine. I was not
pushing it for full output either as I was not serious in the test.
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