Re: [Elecraft] KPA1500 Cooling
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 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 > > 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, 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 mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/mmfaq.htm > > > Post: mailto:Elecraft@mailman.qth.net > > > > > > This list hosted by: http://www.qsl.net > > > Please help support this email list: http://www.qsl.net/donate.html > > > Message delivered to w...@w2xj.net > > > > > > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to dick93...@gmail.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ai4ns.m...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 > 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, 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 mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to w...@w2xj.net > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to dick93...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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, 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 mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@w2xj.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
Bill, That is what I was trying to remember what we used for cooling for the electrodes in RF plasma tools. Thanks N2TK, Tony -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Bill Frantz Sent: Friday, July 24, 2020 9:56 PM To: elecraft@mailman.qth.net Subject: Re: [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 a monument | Periwinkle (408)348-7900 | to C's continuing support of | 150 Rivermead Rd #235 www.pwpconsult.com | buffer overruns. | Peterborough, NH 03458 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tony@verizon.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 hated SR71s leaking fuel all over their runways. We "dried up" Phoenix after the Shah was overthrown and the Russians got Phoenix and we redesigned it to replace klystrons with IMPATTs. And they paid us to have all this fun. Wes N7WS On 7/24/2020 6:56 PM, Bill Frantz wrote: 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 (408)348-7900 | to C's continuing support of | 150 Rivermead Rd #235 www.pwpconsult.com | buffer overruns. | Peterborough, NH 03458 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [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 a monument | Periwinkle (408)348-7900 | to C's continuing support of | 150 Rivermead Rd #235 www.pwpconsult.com | buffer overruns. | Peterborough, NH 03458 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
In the analog NTSC days, Harris UHF broadcast transmitters were liquid cooled by stuff called UCARTHERM-HTF 6141 (If memory serves me). We called it "Vulcan Blood". It was a special Ethylene Glycol much like automotive anti-freeze but thicker and with lots of other goodies inside. It was an interesting MSDS sheet. An older RCA UHF TV Transmitter I remember "fondly" used distilled water. There was a resistance sensor on the circulation system that measured the resistance of the water. The meter pointer on the yellow part of the meter meant a long Friday overnight to Saturday morning session that week. Usually quarterly. And, don't even think of turning the rig off during cold winter nights! The heat exchanger had no heating element, and if you left the rig off for more than a couple of hours, the water would freeze and crack it open, which was a really bad thing to happen. No snow ever gathered in the vicinity of the heat exchanger exhaust duct. There could be two feet of snow on the driveway, but there was always a spot on the side of the building that was not only snow free, but often dry. Often, the icicles on the adjacent windows were legendary! 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: Re: [Elecraft] KPA1500 Cooling Message-ID: <02b001d66132$4664f990$d32eecb0$@verizon.net> Content-Type: text/plain; charset="utf-8" Hi Paul, I can't remember what we used to use for closed loop cooling. I don't think we used distilled water because it's resistance would increase over time from picking up ions from the metal. In our case it was cooling loops in a copper 37" electrode. I thought it was some kind of antifreeze or maybe an oil? And also isn't distilled water quite reactive? To many bourbons ago ? N2TK, Tony __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 Elecraft > wrote: > > Hi Paul, > I can't remember what we used to use for closed loop cooling. I don't think > we used distilled water because it's resistance would increase over time from > picking up ions from the metal. In our case it was cooling loops in a copper > 37" electrode. I thought it was some kind of antifreeze 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] KPA1500 Cooling > >> "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 2KW LDMOS amp uses water cooling in such a > closed system. > > My main amplifier at home is an Alpha PA-70V. The amp uses an openly-cooled > vapor-phase system. A pint of distilled water separates 4KV of plate voltage > and chassis ground. Water is in direct contact with the plate. In time, air > particles do contaminate the water (usually in the form of algae) and the > system must be purged and refilled at annual intervals. If leakage exceeds a > predetermined amount, the amp faults and shuts down. > > Paul, W9AC > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > tony@verizon.net > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > w...@w2xj.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
glycol and anti freeze. Sent from my iPad > On Jul 23, 2020, at 4:49 PM, N2TK via Elecraft > wrote: > > Hi Paul, > I can't remember what we used to use for closed loop cooling. I don't think > we used distilled water because it's resistance would increase over time from > picking up ions from the metal. In our case it was cooling loops in a copper > 37" electrode. I thought it was some kind of antifreeze 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] KPA1500 Cooling > >> "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 2KW LDMOS amp uses water cooling in such a > closed system. > > My main amplifier at home is an Alpha PA-70V. The amp uses an openly-cooled > vapor-phase system. A pint of distilled water separates 4KV of plate voltage > and chassis ground. Water is in direct contact with the plate. In time, air > particles do contaminate the water (usually in the form of algae) and the > system must be purged and refilled at annual intervals. If leakage exceeds a > predetermined amount, the amp faults and shuts down. > > Paul, W9AC > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to tony@verizon.net > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@w2xj.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
Hi Paul, I can't remember what we used to use for closed loop cooling. I don't think we used distilled water because it's resistance would increase over time from picking up ions from the metal. In our case it was cooling loops in a copper 37" electrode. I thought it was some kind of antifreeze 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] KPA1500 Cooling >"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 2KW LDMOS amp uses water cooling in such a closed system. My main amplifier at home is an Alpha PA-70V. The amp uses an openly-cooled vapor-phase system. A pint of distilled water separates 4KV of plate voltage and chassis ground. Water is in direct contact with the plate. In time, air particles do contaminate the water (usually in the form of algae) and the system must be purged and refilled at annual intervals. If leakage exceeds a predetermined amount, the amp faults and shuts down. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to tony@verizon.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 Cooling
>"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 2KW LDMOS amp uses water cooling in such a closed system. My main amplifier at home is an Alpha PA-70V. The amp uses an openly-cooled vapor-phase system. A pint of distilled water separates 4KV of plate voltage and chassis ground. Water is in direct contact with the plate. In time, air particles do contaminate the water (usually in the form of algae) and the system must be purged and refilled at annual intervals. If leakage exceeds a predetermined amount, the amp faults and shuts down. Paul, W9AC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 normal use I can tolerate the noise. Contesting > gets a little loud. That is what the Bose QC30 noise cancelling headphones > are for. > > Dave wo2x > > Sent from my waxed string and tin cans. > >> On Jul 23, 2020, at 1:00 PM, W2xj wrote: >> >> 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 : >>> 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 from under amp and drops the temp 2-3 degrees C. >>> >>> Richard >>> *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, >>> J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV >>> >>> >>> *Be joyful in hope, patient in affliction, faithful in prayer* >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to w...@w2xj.net >>> >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to rocke...@gmail.com > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qt __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 normal use I can tolerate the noise. Contesting gets a little loud. That is what the Bose QC30 noise cancelling headphones are for. Dave wo2x Sent from my waxed string and tin cans. > On Jul 23, 2020, at 1:00 PM, W2xj wrote: > > 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 : >> 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 from under amp and drops the temp 2-3 degrees C. >> >> Richard >> *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, >> J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV >> >> >> *Be joyful in hope, patient in affliction, faithful in prayer* >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to w...@w2xj.net >> > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to rocke...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA1500 Cooling
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 : > 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 from under amp and drops the temp 2-3 degrees C. > > Richard > *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, > J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV > > > *Be joyful in hope, patient in affliction, faithful in prayer* > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@w2xj.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 Cooling
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 from under amp and drops the temp 2-3 degrees C. Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV *Be joyful in hope, patient in affliction, faithful in prayer* __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
