RF overload can do a lot of things.
Try above and below 12W (8W on 6m) to see if the KPA3 is swamped.
Or an antenna on the RX port (If KXV3 equipped).
Also RF overload can excite any loose connections at the tower site,
rusty metal, fence joints etc.
You are just going to have to sniff around with a portable setup.
Keith WE6R
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