Hi, How about following Vic, 4X6GP's advice and test the K3 without the KPA500 in circuit? Your symptoms are exactly as if the K3 TX calibration is badly out of wack as he suggests. The fact that a band change makes it worse is a dead give-away. A band change makes the K3's ALC algorithm reset itself to defaults and these defaults are set by the TX gain calibration. Your situation seems a bit extreme, though, with only 20% initial power so there may be other problems. But please test this out without the KPA500 in circuit. And surely eliminate antenna problems by testing into a dummy load.
AB2TC - Knut Bill Conkling wrote > That hasn’t helped my KPA500. I notice it particularly after a band > change. > > …bill nr4c > > >> On Nov 13, 2016, at 10:58 PM, Vic Rosenthal 4X6GP < > k2vco.vic@ > > wrote: >> >> Hi Barthold, >> >> Maybe the K3S output is ramping up slowly. Do you notice this with the >> KPA500 off? Running the TX Gain Calibration in the K3 Utility might help >> in that case. >> >> 73, >> Vic, 4X6GP >> Rehovot, Israel >> Formerly K2VCO >> http://www.qsl.net/k2vco/ >> >> On 14 Nov 2016 00:51, Barthold Lichtenbelt via Elecraft wrote: >>> Hi All, >>> >>> >>> >>> Maybe you can help with something that is baffling me. My KPA500 doesn't >>> go >>> to full output until I have spoken my callsign (when trying to get >>> through a >>> pileup) a few times. It starts off with 100 or so watts, and after a few >>> iterations rises to the full 500W output. I see this both on the KPA500 >>> LED >>> bar, as well as on the P3 PEP output monitored by P3TXMON. My full >>> setup is >>> K3S+KPA500+KAT500+P3+P3TXMON. All devices run the latest released >>> firmware. >>> >>> >>> >>> Any thoughts much appreciated! >>> >>> >>> >>> Barthold >>> >>> AD0RM >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto: > Elecraft@.qth >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to > nr4c@ > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto: > Elecraft@.qth > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to > lists+1215531472858-365791@.nabble -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-power-output-starts-out-low-then-goes-up-tp7623993p7624027.html Sent from the Elecraft mailing list archive at Nabble.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
