[Elecraft] KPA500 Temps?

[Harry Yingst]

I use the KPA500 utility and just set the Fan to constantly run at a lower speed, the fan will speed up if needed.




      From: Arthur Nienhouse <ka9zap at gmail.com>
 To: cx7tt at 4email.net; elecraft at mailman.qth.net 
 Sent: Monday, January 16, 2017 10:13 AM
 Subject: Re: [Elecraft] KPA500 Temps?
   
/*I have chosen to put a Noctua helper fan on the inlet pushing air 
through it has helped, This fan is powered on from the k3 12 volt out it 
comes on with the radio runs all the time, my room temp is 67 degrees f 
the amp is idling at 24c I can usually get a reasonable cw rag chew over 
in before the fan gets to launch speed. This is not a total fix but does 
help. This fan sits on the soft rubber feet that you pull into 
positioning through holes in the 4 corners.
Here is a link to this fan these are very good at quietly moving a lot 
of air I have a pair on the k3 as well.
https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1CHFX_enUS513US513&ion=1&espv=2&ie=UTF-8#q=Noctua+nf-a9x14pwm
Interesting reading is the development of the design venture, ribs, 
blade shape.....
Regards
ka9zap
*/



On 1/16/2017 8:22 AM, cx7tt at 4email.net wrote:
> For the NAQP cw party this past weekend, I ran low power. Rather than
> 'stress' the K3s with 100W, I chose to run 6W thru KPA500, giving me 100w.
>
> During a one hour run period, 125+ Qs on 15m, I noticed the KPA500 temp
> at 51C which surprised me. Idle temp in the shack is generally around 33
> to 35C. I expected much lower temp at 100w output.
>
> Why the higher temp and is it not related to power out?
>
> 73
> Tom
> HP1XT
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