Well .... First I need to check out our points of reference .....What do you think is an rf speed controller?

I will however hazard a guess that you mean a Radio reciever .....in which case each channel will allow you to drive one motor (Foward -Neutral-Reverse)
The Transmitter outputs a signal that corresponds to the stick position .....the reciever takes this signal and passes it on to the main ESC or Electronic Speed Controller which outputs a Pulse Wave Modulated voltage to your motors.