Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-10 Thread Edward R Cole
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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-10 Thread Clay Autery
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,

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-10 Thread Ron D'Eau Claire
, 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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-10 Thread Ignacy
I wrote an article on fan noise including in amplifiers. See http://www.eham.net/articles/38328. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA-500-Running-hot-on-20m-tp7625577p7625633.html Sent from the Elecraft mailing list archive at Nabble.com.

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-10 Thread Gordon LaPoint
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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-08 Thread Harry Yingst via Elecraft
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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-08 Thread Ken K6MR
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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-08 Thread W0MU Mike Fatchett
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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-08 Thread Fred Jensen
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

Re: [Elecraft] KPA-500 Running hot on 20m

2017-01-08 Thread Don Wilhelm
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.

[Elecraft] KPA-500 Running hot on 20m

2017-01-08 Thread W0MU Mike Fatchett
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