The Russian group, eb104, produces LDMOS water cooled amps. You can see
them on their YouTube channel. The amps are much quieter than the
KPA1500 but not as compact.
73,
-John NI0K
Clay Autery <mailto:k...@montac.com>
Sunday, June 03, 2018 1:08 PM
"Water cooling" has come a LONG way from the days back in the 90s when
we were machining out own water blocks from aluminum and copper, and
trying to construct flow loops that didn't leak, find suitable
radiators, etc.
But I don't think there are any current CPU/GPU coolers on the market
that would touch the heat rejection requirements of the combined LDMOS
modules, assuming you could find a model that could be adapted, and
somehow managed to find a way to get it attached.... You'd ALMOST
HAVE to cool the copper heat spreader, since the LDMOS are I suspect
soldered to it. Don't know if the heat spreader is soldered or
mechanically attached to the heat sink.. It is possible that you
could gang multiple large OTS CPU coolers onto the heat spreader in
place of the massive heatsink.
Then you'd need to figure out what you were going to do with the 1-
"n" number of sets of hoses and radiators.... and 1-3 times n number
of radiators in very large fans.
And THEN, remember that there are other thermal loads inside the
chassis... You'll still need to provided some airflow to those loads,
so you'll still need case fans.
Certainly and interesting and intriguing project for someone deep of
pockets and most grande of huevos.... but not a trivial task certainly.
I personally would not risk my $6k amp to do it... If I had one. :(
73,
______________________
Clay Autery, KY5G
(318) 518-1389
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Drew AF2Z <mailto:pu...@af2z.net>
Sunday, June 03, 2018 8:11 AM
There are liquid cooling systems available for CPUs and graphics
cards, used by gamers and overclockers. Have no idea how this would
compare to cooling a 1500 watt RF power amplifier but probably more
analogous than an airplane engine.
73,
Drew
AF2Z
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Dauer, Edward <mailto:eda...@law.du.edu>
Saturday, June 02, 2018 4:09 PM
I have been following this thread with interest because I have a
KPA1500 on order, and I have very limited flexibility as to where the
RF deck can go compared to where I will have to sit.
Don's video was very well done and a great help in understanding the
realities.
I know zero about thermodynamics, and so wanted only to say thanks to
everyone who is contributing ideas, and to make but two comments.
First, as to water cooling, I suspect it would be a huge weight
penalty to get the cooling fluid everywhere it needs to be. So far as
I know there is only one reciprocating engine made for aircraft that
has a water jacket. (There might be others nowadays - I haven't owned
an airplane for some years.) The reasons others don't are reliability,
safety, complexity, and - mostly - weight. Second, isn't this largely
a contest-operating issue? I believe we are still governed by the rule
that we may use only that amount of power necessary for the
communication. I contest too, so I'll face the problem on those
occasions, but not for casual ragchews. I plan to make some graphs of
when in terms of time, power, mode and band the fans on mine kick up a
notch, and use it as a general operating guideline if I need to.
Ted, KN1CBR
Date: Sat, 2 Jun 2018 08:48:46 -0600
From: Don Butler <n...@comcast.net>
To: Paul Baldock <p...@paulbaldock.com>, "Elecraft@mailman.qth.net"
<Elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KPA1500 Fan Noise Video posted
Message-ID: <mailman.7833.1527966108.9989.elecr...@mailman.qth.net>
Content-Type: text/plain; charset="utf-8"
Paul ?. The PS noise is minimal from my point of view. The power
supply fans do run continuously while the amp is switched on ?. You
can hear the PS fans at the beginning and end of the video when the
fan speed is set at ?0? .. all you?re hearing at that time is the PS
fan ? at power down right at the end you can hear when the PS fans stop.
Don, N5LZ
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