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Those systems only work if the radio's clocks are synchronized. Maybe not perfectly synchronized, but as humanly possible to get it to as close to being perfectly synchronized as possible. You need that to happen for these systems to work. So as a result of it, a frequency division multiple access system It requires that it will require that there be some sort of control over the structure of the signal. So often in a repeater based system, in order for it to work, the radio has to be sitting on the correct divided channel. It can't be on the wrong side of that channel or it won't work. The time division multiple access, which requires that super synchronized clock, that's the first time.