Isle of Man DMR Talkgroups
The following talkgroups are assigned to the Isle of Man DMR repeaters at the UK C-Bridge:
|Timeslot 1||Timeslot 2|
|TG9 Local Secondary||TG9 Local Primary
TG801 Metro East
|TG13 Worldwide English||TG802 Metro West
(EP, GF, HR, ID, MP, NS & SC)
|TG235 UK Wide||
TG810 South-West England
|TG113 User Activated Worldwide English 1||TG820 North-West England - This is our "Home Region"
(BR, CA, LP, MB, MR & PN)
|TG123 User Activated Worldwide English 2||TG830 Midlands
(FW & GB)
|TG119 User Activated Worldwide Any Language 1||TG840 East of England
(CL, CT, DS, FU, LN, MK & PE)
|TG129 User Activated Worldwide Any Language2||TG841 User activated link MK and DS
|TG80 User Activated UK-wide 1||TG850 Scotland
(DD & EE)
TG81 User Activated UK-wide 2
|TG860 North East England
(EL, HS, HX, LE, SR, TD, TP & XX)
|TG822 User Activated Special link between
CA, BR and PN
|TG862 M62 MOTORWAY
(HS, HX, LE, MR & TD)
|TG4400 User activated to DMR+ reflector 4400.
10 minute timeout
|TG870 Wales and Marches
|TG880 Northern Ireland (Reserved)
|TG9990 Echo Back for Audio Test
ALL talkgroups - with the exception of TG9 - are user-activated.
Note that GB7PN is included in two talkgroups - North-west England and also Wales.
Slot 2 has been set up to give higher priority to TG9 (Local) calls. When you are using TG9 the regional groups will be disabled for 3 minutes. TG8xx will come back on automatically after 3 minutes of local inactivity or immediately if you transmit on TG8xx. (note the 3 minute timer is reset on the start of each transmission, so a long transmission will eat into the hold-off time. This is a limitation of the bridge software).
The "Home Region" is always on and, if a call is made on one repeater in that region, it will be relayed on all of the other repeaters in the same region. The remaining regions are available as ""User Accessed" talkgroups. In other words, calls on those groups will only be heard on a repeater outside of the region if a user transmits on that talkgroup.
With Effect from December 2015, Direct Dial talkgroups have been removed and replaced with two UK-Wide user-accessed talkgroups (80 and 81). At first glance, this may appear to be a retrograde step but it is, in fact, an enhancement in flexibility. This extract from an e-mail on the DMR admin mailing list illustrates the way in which this new arrangement can be beneficial:
"You are on GB7XX and call MM0DUN on TG235. He responds via GB7DD. You arrange to "QSY" to TG81. At this point, *only* GB7DD and GB7XX are involved. I'm at home ... I heard you arrange the "QSY" and wish to join the conversation, so I'm going to select TG81 on GB7FU. Now only three repeaters are in use.
We've clearly not made it obvious that it could (does) work this way, so we will improve that part of our communications. Of course, for the clearer thinkers, this is actually *BETTER* than direct dial (assuming everyone uses TG235 as a calling channel, rather than a natter channel) since you can now have three (or four, or five) way QSOs with the minimum of resources used - something that wasn't possible with DD as it was implemented."
The authoritiative list of UK talkgroups can be found here.