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Here’s where I find my base operating system for my repeater installations.

Minnesota MARC Std TalkGroups

PTT (On Demand) talkgroups do not carry traffic on the local repeater until a user “Activates” them by clicking their PTT button or “kerchuking” the group. Once activated, the PTT group will carry traffic until communications cease for a set period of time.
Always On talkgroups are continuously active across all repeaters regardless of local traffic.