I can't see any error in the related CAT commands on QMX (FA, FB, FR, FT).? They operate as described in the manual, and as the basic use of them is described in the Kenwood definitions.? But as noted in QMX operations guide, the way Kenwood does Split mode does not correspond exactly to the way QMX uses the VFOs, so the logging software may be doing something incompatible with QMX.
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You can see the exact CAT commands your logging software is sending, if you want, by using the terminal menu, and selecting 'PC and CAT' and then 'Log file'.? In that screen, hit 'A' to enable logging all commands.? Then exit the QMX terminal and use your logging software, then come back to the 'Log file' screen to see the commands issued.? All lines with a ';' are from CAT, ones without a ';' are QMX internal logs noting mode changes, etc.
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Stan KC7XE