I have been running WSPR for many months using a wide variety of rigs.
I recently acquired an KX3/PX3 unit but just cannot get the CAT side of WSPR to
control the KX3 !!

It works OK with WSJT-X and Ham Radio Deluxe...

I am using Elecrafts supplied USB lead and it is Com 5 38400 Bd

Someone must have an answer please??

Roger G0IUW