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Definition of "Selective Calling" |
In a conventional, analog two-way radio system, a standard radio has noise squelch or carrier squelch which allows a radio to receive all transmissions. Selective calling is used to address a subset of all two-way radios on a single radio frequency channel. / Closed Circuit Television is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes. |
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