One report suggested that the 9C has a high latency factor and adding a 2.4 module might introduce enough latency to create a problem.
It would also be interesting to know:
1. The frame rate (number of frames seen by the servos per second).
2. At what low voltage does 2.4 gig go to fail safe?
3. After a low voltage spike what is the signal reacquisition time or number of frames lost?
Bill