The reason I don’t suspect the PIN diodes is that the KPA works properly with the K3. The K3 does not have a magical ability to repair KPA PIN diodes, so it most likely is not a problem there.
This is probably a K3 without the new K3S I/O board, which means it has pull-up resistors on the BAND lines. When the K3 is powered off it pulls those lines down, which is the same as 60 meters. But, it will only change the band one time in this situation. My biggest curiosity is why unplugging the AuxIO cable will cause the KPA to not go into OPER mode. There must be something else connected for this to happen. Jim, you might try unplugging the cable from the back of the KPA to test this. Once we have that working, we can move on from there. And perhaps find a way to get our direct email path working again... 73, Jack, W6FB > On Mar 31, 2022, at 5:39 PM, Andy Durbin <a.dur...@msn.com> wrote: > > "However, what I’m seeing is that when the amp is in OPER mode, my receive > signal strength drops way, way off to the point I have to go full AF volume > to hear signals. If I put the amp in STBY, signal levels go back to normal." > > These exact symptoms have been associated in past reports with a failure of > the TR switch PIN diodes. Jack's idea of incorrect band can be easily > confirmed, or eliminated, by looking at the KPA500 band display. > > Andy, k3wyc > ______________________________________________________________ > 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 jackbrin...@me.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
