[Elecraft] KPA1500 - temp reading drops 10C when under power

[Jeff Blaine]

Yea, I was on 40m also.  So there's a second data point.

Did not notice it before - but having watched it pretty consistently 
tonight, I will know what to look for on other bands.  Tonight was the 
first night I had the chance to run it on RTTY and want to be sure the 
thing is ready for prime time given the CQ RTTY DX is coming up end of Sept.

The good news is that the amp seemed to level off at 73C (or 63C?) and 
that means fan 2 was able to keep things under control. SWR is nearly 
1:1 on that band and I don't know what it does on other bands but it was 
REALLY GREAT that fan speed 3+ was not needed.  1&2 are in a completely 
different sound category compared to the 3+ which sound like my 
company's computer server room.  ha ha.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 18-Aug-18 12:11 AM, Bill Stravinsky via Elecraft wrote:
>   I noticed this problem shortly after getting my 1500 back in May.  I only see this problem on 40 mtrs for some reason.  I've never seen a 10 degree fluctuation but itis regularly 6 degrees and has approached 8 degrees.   I only work cw for the most part.  I see it all the time when the duty cycle goes up like when contesting and thatis when I start looking at the temp more often so that's how I noticed it to begin with..
>
> I've learned to live with it, at least for the time being, for the following reason.
> I contacted Elecraft and talked with one of the engineers.  Apparently this problem was addressed during early engineering but leave it to me to be the first one toexperience this.  He explained that there might be a possible fix for it that would require installing a cap, most likely an SMD type.  I would be more comfy with a discretecomponent, hi.  But the jist of the conversation was that its just a touchy temp sending device.  I downloaded some file from the utility program and I don't think thetrouble was exposed in the file for some reason after I sent it to them.
> Film at eleven.
> BillK3WJV.
>
>      On Saturday, August 18, 2018, 12:49:55 AM EDT, Jeff Blaine <KeepWalking188 at ac0c.com> wrote:
>   
>   While running the KPA1500 in the SARTG tonight, I noticed that the temp
> reading drops about 10C when transmitting.  min fan speed 1.
>
> Seems to be related to power - at 1500W it's pretty close to 10C.  At
> lower powers, it's less of a difference.  I don't recall seeing that
> before.
>
> Normal?
>
> 73/jeff/ac0c
> alpha-charlie-zero-charlie
> www.ac0c.com
>
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