[Elecraft] KPA-500 Running hot on 20m

[Harry Yingst]

If it wasent for the noise I'd put mine in my wife's craft room.
She loves the heat.



-------- Original message --------
From: Ken K6MR <k6mr at outlook.com> 
Date: 2017-01-08  9:42 PM  (GMT-05:00) 
To: Elecraft Reflector <elecraft at mailman.qth.net> 
Subject: Re: [Elecraft] KPA-500 Running hot on 20m 

I put mine in a closet away from the desk. Fans were probably near high at least half the weekend. Hoping the fans have long life bearings….



Ken K6MR







From: W0MU Mike Fatchett<mailto:w0mu at w0mu.com>
Sent: Sunday, January 8, 2017 6:38 PM
To: donwilh at embarqmail.com<mailto:donwilh at embarqmail.com>; Elecraft Reflector<mailto:elecraft at mailman.qth.net>
Subject: Re: [Elecraft] KPA-500 Running hot on 20m



SWR is fine.  I have the KAT500 and a SteppIR antenna so that was never
an issue.  The amp has plenty of clearance around it.  It was rather
warm in the shack.  Too many computers LOL.  The high speed fan is crazy
loud even for me that has hearing issues. Maybe will will encase it in
ice next time...Kidding!



On 1/8/2017 6:10 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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