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Moto Type II "ID+1" status bit

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natedawg1604

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On a Moto Type II system, I sometimes see Unitrunker display service code "All", presumably ID+1, or "All Talkgroup". What, exactly, does "All Talkgroup" refer to?
 

Fowler

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Usually its a dispatch that needs to go to all talkgroups... ie robbery in progress...officer in trouble... ect
 

riveter

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"All" indicates an all-group multigroup. Talkgroups can be assigned as members of multigroup talkgroups, and the all-talkgroup multigroup is a special multigroup basically that contains all talkgroups. ALL subscribers registered to the system will follow announced channel grants for that multigroup (rather than just following grants for their affiliated and scanned talkgroups).

Basically, easy way to make a systemwide broadcast.
 

Jay911

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It's a talkgroup that will override all other talkgroups in a fleet and make all users receive the same transmission regardless of what channel they're on. Like Fowler said, it's often used as a broadcast talkgroup for police to alert all units to a critical situation.

This can be programmed in the client radios (the professional two-ways) so that all or any radios an agency owns will switch to this talkgroup when it goes active. In official literature it's often referred to as an "announcement group". And yes, on Moto type II systems, it is "ID+1" when you disable the status bit. So talkgroup 48112, if it is an announcement group or ATG, would come in as 48113 if you told the scanner to treat status bits as different talkgroups.
 

natedawg1604

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Interesting, thanks for all the info. So if I set my 396XT to ignore status bits and program TGID+1 as a priority all-call talkgroup, I should hear the all-call transmissions (unless the 396XT is capable of processing the status bit and automatically prioritizing all-call TG's?).

In Unitrunker, is there a way to prioritize these all-call transmissions?
 
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Jay911

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Interesting, thanks for all the info. So if I set my 396XT to ignore status bits and program TGID+1 as a priority all-call talkgroup, I should hear the all-call transmissions (unless the 396XT is capable of processing the status bit and automatically prioritizing all-call TG's?).

In Unitrunker, is there a way to prioritize these all-call transmissions?

Scanners don't automatically prioritize the ATGs. I believe if you set a scanner to "ignore" status bits, the scanner will treat TG+1 and TG to be the same. Realistically, at least in my experience, the ATG is never used for any other purpose (though I'm sure someone will come up with an example now, specifically because I've said that) so you could set an alert on that TG and leave your scanner set to ignore the status bit.

The status bit configuration in a scanner is a little confusing. IMO they should never have designed it that way, but that's for another discussion. When set to IGNORE, the scanner will treat TG+1 the same as TG (and TG+3 the same as TG, and etc). Only if you set the status bit option to YES will you see TG, TG+1, and TG+3 and etc displayed as separate TGs in the radio.

Professional radios don't display the status bits of individual TGs as separate TGs, like a scanner with Status Bit set to Yes does.

As for Unitrunker, it does recognize all the status bits on a Mot II system and displays them (IIRC) in a field at the extreme right of the frequency line/history display, but as to whether or not you can prioritize on that (I believe you're referring to using Unitrunker to play audio here, rather than just the trunk decoding), only Rick (Unitrunker) could answer that.
 

natedawg1604

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Scanners don't automatically prioritize the ATGs. I believe if you set a scanner to "ignore" status bits, the scanner will treat TG+1 and TG to be the same. Realistically, at least in my experience, the ATG is never used for any other purpose (though I'm sure someone will come up with an example now, specifically because I've said that) so you could set an alert on that TG and leave your scanner set to ignore the status bit.

Okay, good to know. Believe it or not, for the system I'm monitoring TG and TG+1 appear to be used for wholly unrelated purposes, so I guess I need to monitor/prioritize TG+1 with Status Bit = "YES" . And yes, I'm running a voice receiver in Unitrunker to decode the audio.

Also, will my Pro-652 recognize TG+1?
 

Jay911

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According to the "Easier to Read Manual" for the PRO-652 (and others in that same family), they don't allow the status bit to be monitored, sorry.
 

natedawg1604

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According to the "Easier to Read Manual" for the PRO-652 (and others in that same family), they don't allow the status bit to be monitored, sorry.

So, this family of radios won't recognize TG's which are not multiples of 16?
 
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