Hi Dennis.
I had a mail from a guy on the FT-847 reflector, who suggested I go into the extended menu on the 847, and set the "clone rate" to match whatever the CAT Baud rate was set to. I have just done that, and for the first time in World History..it works!! I didn't figure that "clone rate" had anything to do with "CAT rate", but seemingly it has.
Anyway it's now working, and all that remains is to apologise sincerely for taking up your time, and to thank you for your patience.
As I was using TRX Manager as a workaround up 'til now, it wasn't an issue, but from now on I'll be using an LP Pan, with CW Skimmer, Nap 3 etc, so computer resources need to be rationed.
Thanks again! and sorry for the QRM Dennis.
Vy 73 to u es urs
John EI7BA