multiple repeaters

There have been changes to the way we are able to hear the Okanogan County Sheriffs office (Washington)over the air since an upgrade. Sometimes we hear everything on car to car 155.715 and other main channels, but they can now block the same channel intermittently so only dispatch and other...

How do engineers typically set up a multi-site repeater systems in regards to frequencies? I would like if the radios did not have to change channels based on their geographical locations if at all possible. Would prefer to keep all portable units simple set to one channel. I do not like making...