Dynamic talkgroups assignments are used for temporary activation on a timeslot on a particular repeater. This type of talkgroup functions for a set amount of time AFTER a local repeater user activates it by transmitting on a repeater using that talkgroup in their radio. When the timer expires and no local user has keyed up again for a set amount of time… the timeslot and the talkgroup and release and the repeater is again open only to the talkgroups that remain static.
For example, if you are traveling in Scotland and wish to talk to a friend back home in England, you could key up the English talkgroup on a
Scottish repeater that allows dynamic talkgroups and make a call on repeaters at home that have the English talkgroup set as static. When you are done with your conversation, the dynamic timer will expire and the Scottish repeater will go back to normal.