Hi Tom,
Since it behaves into a dummy load it's probably the SWR but you could also
take a closer look at the TX gain calibration. Even after running the
calibration routine I have had to touch up the numbers on a couple of bands.
Take a look at the K3 manual page 62 for TXGN{pwr}. The last paragraph gives
advice on changing the setting manually. Put the K3 on 40 meters, turn off
TX ALC and reduce TXGN slightly. Then turn on TX ALC and give it a try.
73,
Mike K2MK
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