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Broadcast media AND OTHER RF COMMUNICATION use electromagnetic waves to send information across distance. An AM radio can use a very narrow frequency to send the information, but FM communications, such as television, your FM radio receiver and most digital signals, use what is called "frequency modulation" to send a signal. In a frequency modulated signal, the base sigal will start at a single frequency. To send information, the signal changes (modulates) the frequency up and/or down from that base frequency. The FCC and other regulating agencies have reserved certain frequencies for specific commercial broadcast use only. A radio signal may not "overlap" or attempt to use the frequency or any part of the frequency that has been assigned to another commercial broadcaster.

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Q: What is channels to be non-overlapping?
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