OT: but I am going to add a couple cpu fans to the heat sink of my
KXPA100 which will be installed under the backseat of my truck. That
will ensure a little more cooling. The seat sets down on top of the
fins so the fans will be positioned to feed from one end. The
enclosure will be drilled
Optionally, one can replace the internal fans altogether (the heat sink
is not sufficient for passive cooling under all conditions obviously).
If your installation is static, or relatively static, you can duct
cooling air from some place where the noise is "OK" to a properly
located input.
OR,
, Ron AC7AC
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ignacy
Sent: Tuesday, January 10, 2017 8:19 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-500 Running hot on 20m
I wrote an article on fan noise including in amplifiers. See
I wrote an article on fan noise including in amplifiers. See
http://www.eham.net/articles/38328.
Ignacy, NO9E
--
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Mike,
I do a lot of RTTY and other sound card modes with my K3-KPA500
pair. I have the amp go to 70c sometimes, that is when the HIGHEST
speed fan kicks in, NOT 65c. Not a problem, many RTTY contests and
still works fine! The room ambient temp has a lot to do with the temp
of the
il.com<mailto:donw...@embarqmail.com>; Elecraft
Reflector<mailto:elecraft@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
ilto:donw...@embarqmail.com>; Elecraft
Reflector<mailto:elecraft@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
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
It also is fairly sensitive to how tightly enclosed your KPA500 is in
your station equipment configuration. Mine came on high-fan often when
on RTTY, or [fruitlessly] calling CQ in SS CW on Sun. I finally moved
it out of it's "cubbyhole" under the shelf assembly, and it stayed on
low fan all
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.
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
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