Mike; It is definitely a cable problem. If the asterisk is not being displayed on key-down, then the amplifier is not going to go into transmit. recheck the cables all the way from the K3 to the KPA to see what came undone. Find and fix that and the KPA will come back to life.
You might want to ohm out the AUX cable going to the KPA to make sure everything is OK, also, look for bent pins. The PTT signal is on pin 10 of the AUX cable, as described on page 18 of the KPA500 Operating manual. Let us know what you find! 73, - Jack B, W6FB > On Mar 15, 2015, at 3:46 PM, mike <ai...@comcast.net> wrote: > > No, the asterisk on the KPA is missing. Nothing appears on the left of the > KPA LCD. I understand that to mean the KPA is not receiving a valid PA KEY > signal. I am using Elecrfat supplied AUX cables from the K3 to the KAT500 > and another one from the KAT500 to the KPA. > > I did recently change my antennas to the KAT500, removing the one that I had > going to terminal 3. So in case there was a problem with the KAT500, I just > tested going from the KPA RF output directly to an antenna (removing the > KAT500 from the circuit.) I also changed the AUX cable to go from the K3 > directly to the KPA instead of going from the K3 to the KAT500 to the KPA as > it is normally wired here. No change noted. 73 ..mike AI6II > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/KPA500-suddenly-low-output-only-30-watts-tp7600292p7600312.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 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
