Check the documentation carefully. I dont think you can do RC control (PPM or SBUS) when using the asynchronous or mesh versions of the firmware. You would need to use a conventional RC transmitter and receiver, and relay on the mavlink data and GCS once the RC link goes out of range.
Set the failsafes accordingly. Plenty of operators use the RFD modems in this way for very long range flights (but maybe not the mesh network).
That’s why I was asking about the distance… I believe the TXMOD does not have firmware versions for async and mesh.
If you do use the TXMOD for RC control be sure to use SBUS instead of PPM.