The frequency band that a radio and receiver are designed to work in are subdivided into a number of independent radio channels, each at a slightly different frequency. Each channel can support only one user at a time, regardless of the form of modulation or equipment that they are using.
The channel is selected by the use of brand-specific crystals in the receiver and transmitter, or by frequency synthesis, allowing the radio equipment to operate on any channel in the frequency band. 2,4GHz radio systems are required to select an appropriate channel or channels automatically.
Flying clubs employ a variety of transmitter frequency control techniques to ensure that only one person is allocated to a given channel at any time.
The servos that the radio system can control at once are also said to be connected to channels, but this is a different sort of channel to the radio channel.
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