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That replies heavily on the repeater to be the master clock, which is where these control channels emerge or the concept of a control channel emerges. What a control channel is, it's basically a data stream that's sent out on a predefined channel continuously and your group of radios will all hear this channel. Not only can this control channel assign other things to the radios, but it will constantly tell the radios the time so their clocks will update continuously. And this is absolutely crucial to have a time to vision multiple access system work.