RE: 9C/9CAP
9C 9 channel Computer Radio
A = Aircraft version (ratchet throttle, 3 position switch on right front with a 2 pos on the left, and default of a new aircraft type is ACRO)
H = Helicopter version (smooth throttle, the two switches above are swapped, 3 position on left, 2 position on right, default type = HELI)
F = FM or more accurately PPM, that means models that are bought with a reciever come with an FM/PPM reciever and model types default to PPM modulation
P = PCM. Models bought as a package come with a PCM reciever and modulation defaults to PCM
So a 9CHP is a 9 channel heli version with a PCM reciever.
Modulation can be changed on a per model basis, and either A or H has the software for both, the only differences are the throttle ratchet and switch position.