I wouldn’t run the KPA500 at half power. And 25 watts of drive is certainly more than mine requires to attain rated power, except on 6M where it requires 25 watts.
As to power output indicators, I used my Bird43 and a 500 watt element with a known good 50 ohm load. I then calibrated the indications per the manual for my KPA500. That’s when I did the ALC calibration and setup for each band. Sure works nice when everything is correct and correctly calibrated. Bob, K4TAX Sent from my iPhone > On May 16, 2020, at 12:25 PM, TL_Netvision <er...@netvision.net.il> wrote: > > > > Hello Elecrafters > > > > Thanks for your time on this, & I hope to find you all in good health > > > > My setup is K3+KPA500+KAT500. > > > > > > Sometime ago due to probably high SWR (water in the Pl259 leading to > KAT-500) the KPA-500 stopped after a loud noise (can't tell whether KPA or > KAT) was heard. > > When I reset it & checked all bands into a dummy load (no tuner), It > delivered half the regular output power on all bands. (25w in for appx. 150w > out). > > > > I don't know if this means 1 side of the PA is gone, or is there some 3db > pad connected permanently. > > > > Any ideas for test procedures? > > Also how safe (forbidden?) is it to operate the amp in this "half-power" > condition? > > > > > > Thanks in advance, > > > > Isaac, 4Z1TL > > KPA SN 01090 > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > ______________________________________________________________ > 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 rmcg...@blomand.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
