Mike I had the very same thing happen last night while operating the 7QP contest..... which is the first contest I have operated with the KPA1500 .... the heatsink temperature was down in the mid 40s C at the time .... and in my case it occurred on 160 meters only .... SWR as per other meters as well as the digital readout on the 1500 were reading 1.2:1 ... and did not change even when the LED flashing occurred ..... but I was getting intermittent flashing of all LEDs on the amp's SWR meter ....
During the contest I was continuously running on CW with hourly QSO rates running between the 70s and 110s .... I opted to manually switch on the fan to keep the temperature below 60 degs C ..... level 2 seemed to keep it there most of the time .... but I did move up to level 3 a few times (and BTW, at that speed the KPA1500 is clearly the noisiest amp I have ever owned .... but, arguably, it may very well be the "coolest" also ..... headphones were absolutely necessary with that noisy fan ..... clearly much noisier than the Alpha 9500 sitting right next door ... which I also used during the same contest... So Mike, you're not the only one experiencing this phenomenon.... whatever it is.. Don, N5LZ (KPA1500 #45) -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike Crownover Sent: Sunday, April 29, 2018 8:13 AM To: elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 SWR meter I have noticed that after my KPA1500 gets above 50C the SWR indicator light starts to show intermittent high SWR. My KPA500 did not do that. I'm using resonant yagis and the digital SWR meter shows 1.1:1 and doesn't change nor does the SWR indicator on the K3S. It seems the SWR indicator lights are acting independent of the meter on the KPA1500 screen. RF? I have not had any faults or shut downs as a result of the indicated high SWR. The amp operates wonderfully, but the indicator lights are a bit bothersome. Anyone have similar issues? 73, Mike AD5A ______________________________________________________________ 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 n...@comcast.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
