When I first read what had been posted by 123easy, my gut feeling was this smelled like a Motorola
smartzone trunking system. In watching the video clip, I was able to see the new radios at the start
of the clip and that confirmed it. Then in the clip you heard and saw the Motorola name.
How the smartzone system works is it has a number of talkgroups that can be placed on the system.
Some of these may be set up for system wide operation. When one radio comes up on that talkgroup,
not only is it re-transmitted locally to the radio, but comes out on every site in the system. This
allows for anyone on that talkgroup to hear and be heard system wide. Other talkgroups would
normally be limited to the local area that they need to cover only. It may be just one site or a couple
or maybe even three or four sites. Each talkgroup can be set up differently to cover just the area
that it needs to cover.
If a user leaves their normal area, the system keeps track where that radio goes and turns on the
local site that the radio registers into. As the radio moves along into another site coverage area,
that site then provides his talkgroup. So you can go any place in the system and stay on your
local talkgroup.
Jim
I am real curious on how during this "roll call" someone in Atlanta was able to connect to a system 80-100 miles away on 700/800 MHz! Yes, Cobb can add TG's to their system for the users in other jurisdictions, but those agencies are going to have to program in the Cobb DTRS.