Temperature with KPA100 and XV144

[GS-3]

Hi list,

I have run into some minor problems regarding
temperature rises with the mentioned devices and like
your opinion/solution.

1st, the KPA100. I noticed that even when I only
answer some CQs in a contest (CW) the fins get very
hot - of course the little fan fights it. Not to speak
of CQing myself. This is only possible with another
fan on top. (I admit that I didn't dare not using this
additional fan).

2nd, and here it's really bad - or let's say
inconvenient at least. The XV144 shuts down after a
few CQs in CW at 20W - operating in normal room
temperature. Since the cooling is done on the bottom
and there are no fins I expect it not to be too easy
to cool it.

What are your experiences/solutions? What can be done
without two additional fans (and wires and weight)? Or
can a small fan be added to the XV like in the KPA100?

73

Gerhard



       

       
               
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[Geoffrey Mackenzie-Kennedy-2]

Hi Gerhard,

Not an answer I'm afraid, but I recently opened up my KPA100 to try to find
the whole answer to the low power out problem. Even though my KPA100 puts
out 100w on all bands, I don't like something lurking ready to bite! I
immediately noticed that smell as though something had been hot at sometime,
and as far as I can tell (sniff) some resistor(s) around T1 was (were) the
cause. No visible sign of overheating, and values OK. T1 is OK, the
transistors are healthy, the fan runs all the time when power demand is over
11W, and in a pileup the heatsink does get warm but not hot.

Sorry I do not have a XV144.

73,
Geoff.
GM4ESD

----- Original Message -----
From: "GS" <[hidden email]>
To: "Mailingliste Elecraft" <[hidden email]>
Sent: Monday, July 04, 2005 8:08 AM
Subject: [Elecraft] Temperature with KPA100 and XV144

> Hi list,
>
> I have run into some minor problems regarding
> temperature rises with the mentioned devices and like
> your opinion/solution.
>
> 1st, the KPA100. I noticed that even when I only
> answer some CQs in a contest (CW) the fins get very
> hot - of course the little fan fights it. Not to speak
> of CQing myself. This is only possible with another
> fan on top. (I admit that I didn't dare not using this
> additional fan).
>

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