Same symptoms here ... what sounds like a relay click when warm, but doesn't appear to correspond to fan speed change, although it often seemed like there was one click a few seconds after starting to TX (RTTY), and another click a few seconds after returning to RX.
The firmware is linked at: http://www.elecraft.com/KPA500/kpa500_software.htm 73, ~iain / N6ML On Thu, Dec 8, 2011 at 3:36 PM, Gary Hinson <g...@isect.com> wrote: > RR > > The amp was totally silent for the first few weeks of its life. The clicks > only started happening after a mains brown-out here (the mains went down and > back up several times in rapid succession as they tried to clear a fault in > the local grid, I guess). I wondered if that event might have damaged > something but everything apart from the popper works well. > > I tried reloading the firmware* just in case that had been corrupted, but no > change. > > The amp only pops when its warm i.e. in use, so it does seem to be > temperature-related. > > 73 > Gary > ZL2iFB > > * By the way, I couldn't locate the KPA500 firmware on the Elecraft website > (maybe I overlooked it but I couldn't see a link), but anyway the KPA > Utility found it for me. > >> -----Original Message----- >> From: elecraft-boun...@mailman.qth.net [mailto:elecraft- >> boun...@mailman.qth.net] On Behalf Of Joe Word >> Sent: Friday, 9 December 2011 10:40 a.m. >> To: elecraft@mailman.qth.net >> Subject: Re: [Elecraft] KPA500 Heat Expansion Pop >> >> Gary, >> >> That sounds like what I am hearing, thought it was a relay controlling the > fan, >> but as you said, it did not pop when the fan came on/off. >> >> Joe N9VX >> >> > ---------------------------------------------------------------------------- > ------------------ >> --------------- >> Mine pops or clicks too. >> >> In my case, it sounds like a relay switching. I thought at first it was > something >> sensing the temperature and changing the fan speed, but the pop doesn't >> (often) coincide with a change in fan speed, so I think that's a red > herring. >> >> Another ZL told me his KPA does the same thing. >> >> Our amps still work just fine though! >> >> 73 >> Gary ZL2iFB >> >> >> >> On Thu, Dec 8, 2011 at 12:37 PM, Joe Word <joe.n...@gmail.com> wrote: >> > My KPA500 has developed a heat expansion pop. When it heats up and >> > then cools down I get a pop from inside the amp. It does this now >> > every time I make a SSB transmission. >> > >> > Anyone else experience this? If so, any resolution? >> > >> > Joe N9VX >> __________________________________________________________ >> ____ >> 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 > > ______________________________________________________________ > 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 ______________________________________________________________ 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
