[Elecraft] KPA-500 Running hot on 20m

[Don Wilhelm]

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.
>