On mine, the fan comes on briefly when the power supply is first turned
on and then turns off. It comes back on again if it starts to get hot.
I just confirmed that by transmitting 100W into a dummy load for 2 minutes.
Alan N1AL
On 6/13/22 23:31, Walter Underwood wrote:
Are the fans on those power supplies running? Both of those power supplies have
fans on the back.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
On Jun 12, 2022, at 12:51 PM, Jim Ruff via Elecraft <elecraft@mailman.qth.net>
wrote:
Thanks everyone for your quick responses. So far, none of the suggested
solutions have worked, so I hooked the KPA100 up to a different power supply,
an Alinco DM-330MV, and I had the same whirling noise, only not quite as loud.
This leads me to believe that something in the KPA100 is causing some kind of
line noise to the power supply. Is there a fix for this? If not, the noise
doesn't really bother me, but is this noise affecting my signal when I TX?
That is my real concern and I should have made that clearer in my first email.
Thanks,Jim W7JHR
Sent from Yahoo Mail. Get the app
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