dumb trunking question

[FCVPI99]

me and a buddy were talking about trunked systems and VHF/UHF systems

say there is a MOT 2 systems and town next to it is VHF or UHF can that trunk system make a talkgroup on the fly? and when there done delete it?

 

[ka3jjz]

I guess you could use the status bit to indicate a patch was in place on the talkgroup, and have that patch be linked to a VHF or UHF frequency....but to be honest I'm not sure that would not be a lot of work for the systems guys....73s Mike

[edit] Come to think of it, that's not too far off from what happens when a medevac is patched into our local county system, except they use a previously-allocated talkgroup, and not one that is 'manufactured' on the fly by changing the status bit. Still tho, it's probably possible, tho I suspect it would be a fair amount of programming work to get that done.

 

[BoxAlarm187]

Not that this is directly related to the question, but here is what we have locally.

In the county in which I volunteer, we're on VHF high for all public safety comms. The county directly to our east, which we run mutual aid into, is on P-25 800MHz digital. Our county purchased two additional VHF radios and placed them in our neighbor's comm center. This allows the comm supervisors to patch any of our VHF channels into any one of thier TG's, and we're able to communicate on our VHF radios directly across thier P-25 system. Works flawlessly!

 

[FCVPI99]

also what is status bit i call and activity ID i noticed them in the program i use to program the 796D in the trunking section?

 

[Jay911]

I could be wrong, and I'm sure someone will correct me if so, but I think the concept the original poster is asking about is a concept called dynamic regrouping. This allows the system operator to create a new talkgroup and assign users to it. Theoretically, one could put anyone from any fleet on the system - fire, police, ambulance, electric company, airport authority, etc etc etc. The Type II 800 system near me has provisions for this, but it's never been used, and I honestly doubt it would be, because there are "tri-services" talkgroups that all the services I mentioned above can join.

 

[seamusg]

I could be wrong, and I'm sure someone will correct me if so, but I think the concept the original poster is asking about is a concept called dynamic regrouping. This allows the system operator to create a new talkgroup and assign users to it. Theoretically, one could put anyone from any fleet on the system - fire, police, ambulance, electric company, airport authority, etc etc etc. The Type II 800 system near me has provisions for this, but it's never been used, and I honestly doubt it would be, because there are "tri-services" talkgroups that all the services I mentioned above can join.

The new Warren, Mi P25 system has four talkgroups set aside to patch to anothers radio, all they have to do is hookup the radio to their system. The talkgroups are available to both Police and Fire abd Dispatch could patch these talkgroups to any of the regular talkgroups if needed and take it all down when done.

 

[ka3jjz]

also what is status bit i call and activity ID i noticed them in the program i use to program the 796D in the trunking section?

You can read about status bits, and what they really mean to us (they're invisible to a Motorola user) here...

Motorola Type 2 Wiki

AFAIK, at least with the systems around me, there are specific tgs that are reserved for Dynamic Regrouping. So they wouldn't be 'temporary' in the sense that they would disappear after the event was complete.

73s Mike

 

[seamusg]

You can read about status bits, and what they really mean to us (they're invisible to a Motorola user) here...

Motorola Type 2 Wiki

AFAIK, at least with the systems around me, there are specific tgs that are reserved for Dynamic Regrouping. So they wouldn't be 'temporary' in the sense that they would disappear after the event was complete.

73s Mike

Status bits don't exist on a P96 system, but they can assign talkgroups for patching to another system and only hook up the other radio when needeed, thus the talkgroup would appear to disapear after since no more traffic untill next time it is needed, if it is set up right it is plug and play.