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IDAS Type D Trunking - Quick Question

D

devicelab

Whacker Extraordinaire
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Jul 18, 2016
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Location
Bothell, WA
So have an IDAS Type D system that I'm monitoring... (no control channel) and has 3 home repeaters: R1, R2, R3. So far, I've seen only a handful of TGIDs. But, I'm seeing 2-2 and 3-2. Are these unique TGIDs? It just so happens that when I first saw 2-2 displayed it was on R2 and that confused me a bit. I've seen 2-x TGIDs on R1 & R3 but so far I haven't see any 3-x TGIDs on R2 or R1.

Also does this apply to RIDs as well? You can have 2-100 and 3-100 and they're two different units..?

FWIW, it seems like R2 is the 'primary' repeater... as the dispatcher consoles are 2-20 & 2-21
 
EricCottrell

EricCottrell

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Database Admin
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Messages
2,377
Location
Boston, Ma
Hello,

The IDAS (Type D) trunked system uses some of the same scheme as Analog LTR trunking. The number before the dash is the subgroup prefix and usually represents the home repeater for the talkgroup and the radio ID on single site systems. So 2-2 and 3-2 are two separate talkgroups. Most of the traffic for 3-2 would be on repeater 3 on a single site system.

See this thread for more information.
forums.radioreference.com

Understanding IDAS Trunking

Hello, Some useful scribbles as programs decoding IDAS become available. The Icom IDAS Trunk System is an all digital form of an enhanced LTR system. There is no defined control channel and a slow rate data steam (SACH) is used for control information. Much of the same terminology and trunking...
forums.radioreference.com forums.radioreference.com

73 Eric
 
D

devicelab

Whacker Extraordinaire
Joined
Jul 18, 2016
Messages
788
Location
Bothell, WA
Thanks Eric for the remedial lesson. I never did much work with LTR systems back in the 90s when they were prevalent around here.
 
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