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So If I program all the trunked frequencies in for a site I'll be set if the control channel changes?
Unless there is an issue with memory space, I program all channels in my scanners. That's primary control channels, alternate control channels and voice channels. While redundant, it ensures that I will always receive the system. There are no guarantees that a system can't make a voice channel into a control channel and there be a delay in updating the RR database.