A radio system allows the independent control of a number of servos, each of which is connected to a numbered or named channel. The commands for each channel are sent sequentially over the radio link. Radio systems are often sold by the number of channels they can control.
There are two major sequences used for the channel assignments, and they can be divided by manufacturer:
- Futaba, Hitec, Esky
- JR and Spektrum
When electronic CCPM is used, the system will use the channels for aileron, elevator and collective pitch (and possibly an additional channel, in some CCPM layouts), although each servo will of course no longer perform the function suggested by its named channel.
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