Hello Elecrafters, The problem which appeared recently on my K2/100 #5170 is now gone. I did today the upgrade (KPA100UPKT ) and the rig works just fine. I had ordered the upgrade package a year ago, but never installed it. New changes have been made since then to the upgrade kit; and, thanks to Elecraft, I have received the new parts yesterday.
...And for that problem (high reflected power showing on the antenna tuner meter and high SWR, so low power output, but only on 80m), I don't know exactly what caused it (maybe some kind of oscillation?) since that upgrade required many changes. But anyway, glad to use my K2/100 on 80 meters again. Thanks to Don W3FPR for good suggestions on private emails. 73 de Pierre VE2PID
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