Neighbor and serious contester K6XX was the engineer who put both of
their amps into production. He borrowed my KPA1500 for a contest after
he lost everything in a major wildfire. He told me my fans were super
dirty with dust, because I was running them at far higher speed than
necessary to keep the amp cooler than necessary.
Bob's advice was to use the Auto setting for the fans and let the
protection logic take over. I've done that ever since (about 18 months)
and while I've seen the temp get up to 90 C a few times, I've had no
issues running heavy CW and RTTY contesting. Usually though, it rarely
gets much above 75 C.
What I HAVE seen is that the amp runs hotter if the tuner isn't well
matched, which emphasizes the importance of training for our antennas.
73, Jim K9YC
On 1/30/2022 1:29 PM, Ed G wrote:
Folks,
Using the KPA1500 remote program. There is a slider control for the fan
just below the temp bargraph. I can manually adjust the slider to give me
different fan speeds, so the control is communication with the KPA1500.
I seem to remember when I first installed the remote software that the
slider position responded to the KPA1500’s automatic fan speed. I could look
at the position of the slider and know (while wearing headphones) what the fan
speed was. But that no longer seems to be working, and the blue slider remains
at the far left position even when the amp fans are running. So I’m not quite
sure how this slider is supposed to work. If I set min fan speed in the KPA1500
menu to “1” the slider position will move to “1” It just doesn’t move when the
fan is set to “auto” and comes on by itself.
--Ed, N3CW—
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