[G4/G5] Priority vs. Non-Priority Talk Group List

[ErikSwan]

Can anyone explain how dividing talk groups between the Priority Talk Group List and the Non-Priority Talk Group List works?



If there is a voice call ongoing from a talk group in the non-priority list, and a new voice call from a TG in the priority list starts, will the radio actually interrupt the non-priority call and play the call from the priority TG?

That would be cool (and intuitive), but from my understanding of how P25 P1 trunking works and how the radio is likely operating internally, I would assume that would be impossible because if the radio is tuned to a voice traffic channel for a voice call, it can't know about a new call/channel grant being initiated on the control channel until the current call is done and it can tune back to the control channel frequency.

Unless the radio has at least two independent 700/800 MHz tuners inside it?

Can anyone explain how this actually works?

 

[kf8yk]

On a P25 trunked voice channel there's low speed data mixed in the voice frames that may contain channel grants occurring on other channels.

These channel grants announcements are an optional feature of P25 & due to the limited data rate available some systems may only include group voice channel updates for a small set of critical talkgroups as selected by the system administrator.

 

[ErikSwan]

Thanks, I didn't know that and I guess that explains how theoretically the G4/G5 could be aware of new calls being initiated. I was also hoping to hear from someone who's really familair with the G4/G5 who could explain how exactly this is implemented and if it even works.

And if I split my talk groups between the priority and non-priority lists, can I actually monitor up to 128 talk groups (64 on each)? Previously I had read that the G4 and G5 can only monitor/scan up to 64 without using TG-Monitor mode or a wildcard TGID, but it seems like if you split the TGs you can monitor 64*2 = 128?

EDIT: It seems like the answer is no, it's only 64 total. The GUI is a little misleading but the "total" number above each list box counts the total TGs in both boxes. So you can only have 64 total, not 64 in each list.

 

[ErikSwan]

Related threads:

G-5 Priority Talk Group

Are Priority talkgroups truly "priority" as in a non-priority talkgroup transmission being pre-empted, so that the G-5 checks for traffic on the Priority talkgroup? Anything special to be set other than putting the desired talkgroup(s) in the Priority Talkgroup List? What I'm ultimately...

forums.radioreference.com

Unication G4 Priority TalkGroup

Here is the scenario: Dispatch happens on 1 talkgroup automated voice from CAD. The G4 pager would then revert to Primary talk channel to hear extra details of call and units going enroute. Issue is that if you are monitoring Dispatch \ Primary Talk and have Dispatch in the Priorty Box and...

forums.radioreference.com

Seems like it should work as you would expect, but it may depend on the exact implementation of the P25 system. I guess I'll just have to experiment and see if it works for me.

 

[BenScan]

Can anyone explain how dividing talk groups between the Priority Talk Group List and the Non-Priority Talk Group List works?

View attachment 149527

If there is a voice call ongoing from a talk group in the non-priority list, and a new voice call from a TG in the priority list starts, will the radio actually interrupt the non-priority call and play the call from the priority TG?

That would be cool (and intuitive), but from my understanding of how P25 P1 trunking works and how the radio is likely operating internally, I would assume that would be impossible because if the radio is tuned to a voice traffic channel for a voice call, it can't know about a new call/channel grant being initiated on the control channel until the current call is done and it can tune back to the control channel frequency.

Unless the radio has at least two independent 700/800 MHz tuners inside it?

Can anyone explain how this actually works?

Talkgroups in the priority list will preempt other priority talkgroups below it in the priority list as well as talkgroups in the non-priority list. Unfortunately, even if you "block" a priority talkgroup, it will still preempt lower priority and non-priority talkgroups, which can be annoying.

 

[2wayfreq]

I would put a super important priority Talk Group like a police red button Emergency that is used occasionally.

 

[picscan]

So using the non priority is the way to go if you don't want to be interrupted? Just keep the top empty?

 

[BenScan]

So using the non priority is the way to go if you don't want to be interrupted? Just keep the top empty?

That's what I do now. I use to use the priorities, but now I prefer to be able to focus better. You can always set up multiple knob positions both ways depending on what you want to focus on.

 

[picscan]

Thanks

 

[N4VKF]

Can someone explain how subgroups work? Why would I want to program subgroups? Advantages or Disadvantages?