We used helium to cool IR detectors on the RF-4C. It is also fun later. The
last IR system used nitrogen to cool the detectors. Not as much fun.
On Sat, Jul 25, 2020 at 11:35 RICHARD Martin wrote:
> If you have to use gas, use Helium. It is very good especially at reduced
> pressures where the
If you have to use gas, use Helium. It is very good especially at reduced
pressures where the mean free path approaches the dimension of the
container.
Dick Martin KN6AA
On Sat, Jul 25, 2020, 07:37 W2xj wrote:
> I would avoid that in ham or broadcast transmitters due to the potential
>
I would avoid that in ham or broadcast transmitters due to the potential skill
sets (or lack thereof)of end users. Hydrogen is too explosive in the wrong
hands.
Sent from my iPad
> On Jul 25, 2020, at 6:41 AM, Rich NE1EE <73.de.ne...@gmail.com> wrote:
>
> If you're up to the challenge,
: [Elecraft] KPA1500 Cooling
The Cray-2 computer was cooled with "Fluorinert", a 3M product which is an
electrically insulating, stable fluorocarbon-based fluid.
73 Bill AE6JV
---
Bill Frantz| gets() remains as
If you're up to the challenge, hydrogen is a great for cooling. Very nice
thermal conductivity and thermal capacity. I've worked on systems that used it
for cooling.
~R~
72/73 de Rich NE1EE
On the banks of the Piscataqua
__
Elecraft
The Phoenix Missile was cooled using Coolanol. Insidious stuff. Never wear a
new pair of slacks when you might get near a Phoenix Receiver/Transmitter Unit.
Don't ask me how I know this.
Aircraft carrier Captains hated it leaking all over their carrier decks about as
much as AFB Generals
The Cray-2 computer was cooled with "Fluorinert", a 3M product
which is an electrically insulating, stable fluorocarbon-based fluid.
73 Bill AE6JV
---
Bill Frantz| gets() remains as a monument | Periwinkle
Nobody ever thought of bypassing some of that heat into the building...
Those were the days of cheap energy.
Lu - W4LT
---=---==---
-
Date: Thu, 23 Jul 2020 16:46:00 -0400
From:
To: "'Paul Christensen'" ,
Subject:
Tnx Paul
-Original Message-
From: W2xj
Sent: Thursday, July 23, 2020 5:08 PM
To: tony@verizon.net
Cc: Paul Christensen ; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 Cooling
glycol and anti freeze.
Sent from my iPad
> On Jul 23, 2020, at 4:49 PM, N2TK via Elecr
e-
> From: elecraft-boun...@mailman.qth.net On
> Behalf Of Paul Christensen
> Sent: Thursday, July 23, 2020 3:54 PM
> To: elecraft@mailman.qth.net
> Subject: [Elecraft] KPA1500 Cooling
>
>> "Until it leaks on the LDMOS devices."
>
> Pure water is an i
reeze or maybe an oil? And
also isn't distilled water quite reactive?
To many bourbons ago
N2TK, Tony
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Paul Christensen
Sent: Thursday, July 23, 2020 3:54 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KP
>"Until it leaks on the LDMOS devices."
Pure water is an insulator. Leakage becomes a problem when water becomes
contaminated with conductive particles. This rarely occurs in closed loop
systems that use distilled water when non-contaminating hoses, fittings, and
heat exchangers are used. My
We have 40 KW liquid cooled solid state transmitters and they don’t leak. It
depends on if it is properly designed. There are TV transmitters over 100 KW
and liquid cooling is common in many models and they don’t leak as well.
Sent from my iPad
> On Jul 23, 2020, at 1:10 PM, Dave wrote:
>
>
Until it leaks on the LDMOS devices.
Seriously, I would like to see the KPA1500 available with a larger finned heat
sink and in a larger enclosure using 120 mm fans. That would move a lot of air
across a larger heat dissipation area keeping noise and temps down.
I love the 1500 and under
Personally I would love to see a liquid cooled high powered linear amplifier.
Sent from my iPad
> On Jul 23, 2020, at 12:40 PM, Richard Zalewski wrote:
>
> Firm believer in cooler is better. Also believe one must be careful not to
> disrupt designed air flow. I purchased this :
>
Firm believer in cooler is better. Also believe one must be careful not to
disrupt designed air flow. I purchased this :
https://www.amazon.com/gp/product/B0059BCVXY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8=1
and put it on the desk to the side of the amp. Seems to aid in moving the
warm air
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