Greetings from southwest Florida. My KPA500 is kicking out with REFL HI warning (high SWR). But here is the strangeness. My setup is K3->KPA500->40' coax->MFJ 600W remote tuner -> 4:1 balun -> open wire feedline to 80-meter doublet. In words, I have a remote autotuner feeding an 80-meter doublet fed with 600-ohm open wire line. A Balun Designs 4:1 balun provides the interface from the open wire line to the tuner.
With the autotuner tuned at low power, the SWR shows 1.5:1 on my KPA500 and external SWR meter. As I run the power up to 300, 400, 500 watts, somewhere in there all of a sudden the SWR instantly jumps off the scale, into the red LEDs on KPA500, and it faults. It's as if the SWR were dependent on power. Even stranger, when I back the power off to say 250 Watts, holding key down the SWR is stable in the green (<1.5:1), but when I key it at CW rates, the SWR bounces into the red on every dit and eventually faults, when at steady state key down it never leaves the green zone! I fear it is the tuner falling over, but it should be able to handle the power. I see this on all bands from 80-20. Operating into my 20-meter resonant vertical, with no tuner, everything works fine. Any ideas or hints on how to correct this? Thanks, Chris 73 de K1AY -- Life is like Linux - it never stands still. ______________________________________________________________ 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
