Thanks for the responses guys!
So far this morning I've been experimenting with menu settings, and by lowering the processor lever down to only 1 or 2, (menu -074) I can eliminate almost all distortion. Normally it is at 50%.
AM sounds perfect at 50%, so it appears to just be an issue with SSB.
The mic cable and coax have clip-on ferrite chokes on them and SWR is virtually flat 1:1.
Other radios on same antenna are fine. Antenna is 80m wire flattop dipole.
Still perplexed though...
Mike
KD7VRG
