How does an EDACS system affiliate?

[wwhitby]

All:

I'm using the log from Unitrunker to determine if little used talkgroups are analog or digital on the local analog and Provoice digital system. While scanning the log for talkgroups, I see quite often the radios affiliating with the system.

My question is how do the radios do that? Do they affiliate with every talkgroup that is programmed in the radio, or just the one that the radio happens to be tuned to when it powers up? Does a radio affiliate with a talkgroup when the user changes talkgroups? If I can figure that out, it might help me map out what is programmed in radios used by the various agencies.

Thanks,

Warren

 

[EDACSTECH]

All:

I'm using the log from Unitrunker to determine if little used talkgroups are analog or digital on the local analog and Provoice digital system. While scanning the log for talkgroups, I see quite often the radios affiliating with the system.

My question is how do the radios do that? Do they affiliate with every talkgroup that is programmed in the radio, or just the one that the radio happens to be tuned to when it powers up? Does a radio affiliate with a talkgroup when the user changes talkgroups? If I can figure that out, it might help me map out what is programmed in radios used by the various agencies.

Thanks,

Warren

If the radios are configured to affiliate, they will do so when turned on and every time they change talk groups and or systems, on a multi-site system.

 

[wwhitby]

Do they affiliate with all the talkgroups that are programmed in them when the radio is powered up?

Warren

 

[SCPD]

Hi Warren;

The radio affiliates to the one talkgroup that is currently selected. When the user turns the channel selector knob - the radio affiliates to the new selection.

 

[Muxlow]

SO if an agency burns thru every talk group on their system they will all show up?
Say...
radio: Lable: Group: Lable:
567 Jail Com 48 Operations
567 Jail Com 50 Transport
567 Jail Com 47 Incomming

Say that 48 is comon. And 50 and 47 have never came up and they went and tuned their radio to them 2 talk groups they would show up? Even if they didnt transmitt on them?

 

[blah546]

The radio can only affiliate on one TG; the TG that the radio will transmit on if the PTT button is pressed, not any TGs that are in it's scan list.

Yes, once a radio is affiliated with a TG then that site is supposed to transmit that TG so the new radio can hear it. It doesn't matter if the radio ever transmits on it or not as long as it's affiliated.

 

[DaveNF2G]

I've seen this happen on Motorola systems. Someone will turn on their portable, then spin the dial. The radio will affiliate with each talkgroup in turn.

The local EDACS systems in my area don't display affiliations, but I imagine the same thing would happen if they did.

 

[Muxlow]

Here in Chatham Kent they do. Not sure how it works thou..
Police dispatcher will say 10-39 (witch is switch channs) and they go to querry and nothign happens in the aff area. Same with fire diept. When they switch channs and talk on them nothign happens.
But i have maybe 19 or so in a 12 hour shift of affiliations.

 

[N6DRA]

If a single unit goes to a talkgroup that no one else has registered in (other units, console, etc) the system knows it doesn't need to transmit. In a wide area (multi site) system, it should only bring up sites that have users in that talkgroup registered there. To do so would waste bandwidth on the backbone.

With advanced protocols, the switch knows the location (site) of every registered user.


Tim