I posted a while back about not being able to drive my KPA500 to full power on 6M. Trying to drive it beyond 200 watts resulted in a HI SWR fault. I initially blamed it on the antenna, cables, connectors, etc. etc. It worked fine on a dummy load.
But changing antennas and cables and so on resulted in the same problem. Next, I hooked up my ICOM 706MKIIG. No problem!
Aha! something’s wrong with the K3S. But it worked on the dummy load.
Scratched my head a while and finally decided the K3S was putting out a spurious signal of some kind. No problem with a dummy load because it didn’t care what frequencies it was seeing.
There was an additional problem: No transmit with mode set to USB or LSB. Change mode to CW, tap the key, switch back to USB, output fine.
So I sent the K3S off to Elecraft. Yep! Spurious signals being generated. They replaced Q7 and 8 on the KPA3A, set bias, and did tx again calibration.
They also replaced the KLPA3A board.
Just got it back today and all is well.
Great service!
73 (NOT 73s),
K8NU
Carl Yaffey K8NU
Recording studio.
[hidden email]
614 268 6353, Columbus OH
http://www.carl-yaffey.comhttp://www.grassahol.comhttp://www.bluesswing.com______________________________________________________________
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