As I stated, if the coax is old (I'm talking like 10.. 15 or more)
years... just replace it. I don;t think I'd waste a lot of time trying
to troubleshoot old coax. Don't forget about the balun to the NAV
antenna, it can get lossy when old and degrade NAV reception.

A high VSWR can ultimately damage the transmitter as well, since that
reflected power if coming back into the RF power stage where it will
increase the operating temperature and ultimately cause failure.

Jim B wrote:
Thanks both Tauno and ktbr.

Second question. After we returned home, I swapped the KX155's returning
them to the original slots. #1 KX155 (the wet one) didn't give us any
pitching problem with the auto pilot, however, thinking of coax, conection,
or antenna problems, we had a local tower operator complain about very
staticy transmisions. Reception was fine, Nav functions were fine.

#2 transmitted much better however only #1 is coupled so we couldn't check
the #2 radio/tray/coax/antenna against the autopilot.

Next step to swap coax antenna leads?

Thanks again,
Jim