Lyn Just a thought: the rig has a remote on/off facility and you may be getting extraneous signals into that port. I know nothing more, but it may give you a clue where to start looking.
73 David G3UNA -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Lyn Norstad Sent: 09 February 2023 15:57 To: Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 failure Here's another twist that makes me thing it could be a PS issue. Early this morning, I was hunting down 3Y0J on 10m FT8 (very strong signal here). WSJT-X was in F/H and S/P mode. I stepped out of the shack for a few minutes, and when I came back the KAP500 was powered ON, in Standby mode with the Fault LED lit up. It had been powered Off with the front panel switch since yesterday (the rear panel switch was ON as usual). How is that possible? Thx, Lyn -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyn Norstad Sent: Wednesday, February 08, 2023 4:00 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] KPA500 failure A couple days ago, I stepped out of the shack for a few minutes and upon returning found the KPA500 had shut down. I didnt note any brief power outage, and Im quite sure it was ON when I stepped away. It has been a little quirky in keying since that time. Yesterday it gave off a funny smell and the Power and SWR LEDs were jumping up and down for no apparent reason. The display screen jumps to frequency readout when I key the exciter, no matter what it is set for. The KAT500 seems to be working normally with the amp either OFF or in Standby. I did a total power reset and reloaded the current firmware (v01.54), but no change. I have not pulled it apart yet, but I seem to remember these being the symptoms discussed some time ago that required an LPF rebuild. Somewhere along the line, Elecraft switched to a SM board and thats when the trouble started. So my question besides asking for general advice is if anyone knows the serial number when Elecraft made that change. My KPA500 is s/n 03835. Thanks! 73 Lyn, WØLEN ______________________________________________________________ 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 l...@lnainc.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 davidg3...@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
