[Elecraft] KX3/KPA100/Powerwerx Revisited

[alan at elecraft.com]

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 at 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
>>
>>
>>
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