GO Transit - different TGIDs

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mciupa

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They have a habit of playing recordings, like the audiobooks they played back around Christmas.
So, I'm guessing they've pulled some archived audio from Radi ... oh, I don't where...:wink:

But hey, what do I know? :p
 
ATCTech

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New Metrolinx Talk Groups

I've become tired of Oakville Transit <GRIN> so I switched to Metrolinx for the day. (I know, from the frying pan to the fire.) However, two talk groups are noted in my Unitrunker log that don't appear on Radio Reference:

In the Bus group t/g 111 is active, and

in the Security group, t/g 302 also with activity today.

111 was already in my log, first seen March 12th but it only shows 3 hits in total. The entry for 302 is new and shows 6 hits between 2PM and 7PM.

Submitted for further investigation by those so inclined...
 
mikewazowski

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New Metrolinx Talk Groups

I've got 302 as Enforcement TAC1 in my records but I haven't seen much activity on it at all.
 
ATCTech

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Thanks Mike. I also have t/gs 604 and 605 active as well, no mention of either in the database here...
 
mikewazowski

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Heard mention of USBT on 111. I'm guessing Union Station Bus Terminal.
 
mikewazowski

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New Metrolinx Talk Groups

They don't seem to get much use. Customer service was extremely busy one day but I haven't caught anything in a while.
 
mikewazowski

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Figured out why I haven't been hearing much from Customer Care. Turns out they're tdma.
Also saw RSO10 using tdma.
I've updated the database to show the system as Phase II and entered the Customer Care talkgroup in as tdma.
Only owners of GRE800 scanners will be able to hear the tdma talkgroups.
 
ATCTech

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...so back to DSD I go! Go stuff Mike, thanks for adding the information here.
 
mikewazowski

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Will DSD do P25 Phase II? Haven't played with it much so I'm not familiar with all the modes it will decode.
Watch for channels with a 0 in front of the channel number. These are tdma calls. Pro96Com will even show the timeslot.
 
ATCTech

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Just saw and responded to your PM by the way....

I think I read on the P25 Wiki here that DSD does TDMA. I just remotely switched Metrolinx into Unitrunker but I'll have to do some moving around of radio & dongle assignments to run DSD using one of the R7000s as the data receiver and a dongle for the voice channels when I get home. More dongles on the way though... I'm going to try running 3 on 1 PC and see how it goes. Two at the same time has been fantastic.
 
mikewazowski

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I switched over to Pro96Com and it showed me the timeslot assignments.

Customer Care seems to be using TDMA exclusively. RSO10 switched back and forth between TDMA and FDMA. I assume so body was playing with a non-Phase II radio to see if the talkgroup would switch back and forth.

Also saw a unit to unit call which was using TDMA.

I assume with the current fleet of non-Phase II radios out there, only new users added to the system would be TDMA.
 
ATCTech

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I stand corrected Mike, DSD does decode X2 TDMA but shows P25 Phase 2 TDMA as under investigation but not supported.
 
ATCTech

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I changed over from monitoring the Hillsburgh/Waterdown frequencies to the Toronto simulcast group and Unitrunker immediately picks up a 12th frequency of 412.2875 (LCN 2583, strangely similar to 411.2875 LCN 2503). My signal level is excellent and deleting that frequency results in it being immediately reinserted into the list.

I fully expect this is a phantom freq. showing up being cause by receiving multiple sites on top of one another on the control freq.

Anyone confirm it's validity?
 
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mikewazowski

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It would appear to be used primarily as an alternate control channel. Most of these systems only use the alternate control channels as voice channels when all other voice channels are in use. I was monitoring just before 1700 yesterday so the system was pretty busy.

You can also see the TDMA channels with little use.


Tables
#Format: Table ID,Base Freq,Spacing,Input Offset,Assumed/Confirmed,BandWidth,Slots
00,380.01250,0.02500,5.00000,"Confirmed",0.01250,2
02,380.00000,0.01250,5.00000,"Confirmed",0.01250,1

-Frequencies
#Format: Channel,Usage,Frequency(/Slot),Input Channel,Input Frequency(/Slot),Input Explicit(1/0),Hit Count
"00-2404","v",410.06250/0,"00-2404",415.06250/0,0,2
"00-2405","v",410.06250/1,"00-2405",415.06250/1,0,2
"00-2426","v",410.33750/0,"00-2426",415.33750/0,0,1
"00-2427","v",410.33750/1,"00-2427",415.33750/1,0,1
"00-2440","v",410.51250/0,"00-2440",415.51250/0,0,3
"00-2441","v",410.51250/1,"00-2441",415.51250/1,0,2
"00-2492","vp",411.16250/0,"00-2492",416.16250/0,1,1
"00-2493","v",411.16250/1,"00-2493",416.16250/1,0,2
"00-2676","v",413.46250/0,"00-2676",418.46250/0,0,3
"00-2677","v",413.46250/1,"00-2677",418.46250/1,1,2
"00-2680","v",413.51250/0,"00-2680",418.51250/0,1,2
"00-2681","v",413.51250/1,"00-2681",418.51250/1,1,2
"00-2686","v",413.58750/0,"00-2686",418.58750/0,0,1
"00-2687","v",413.58750/1,"00-2687",418.58750/1,1,2
"02-2405","v",410.06250,"02-2405",415.06250,1,238
"02-2417","c",410.21250,"02-2417",415.21250,1,0
"02-2427","v",410.33750,"02-2427",415.33750,0,253
"02-2441","v",410.51250,"02-2441",415.51250,0,247
"02-2493","v",411.16250,"02-2493",416.16250,1,249
"02-2503","av",411.28750,"02-2503",416.28750,1,1
"02-2525","a",411.56250,"02-2525",416.56250,1,0
"02-2583","av",412.28750,"02-2583",417.28750,1,3
"02-2677","v",413.46250,"02-2677",418.46250,1,248
"02-2681","v",413.51250,"02-2681",418.51250,1,246
"02-2687","v",413.58750,"02-2687",418.58750,1,248
 
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exkalibur

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Well from a technical standpoint, the operator stands to gain. If they switch to a TDMA type system, instantly, their 10 channel FDMA system becomes a 20 channel TDMA system - more or less.

Much the same advantage of TRBO vs NXDN (IE, two talk paths per RF channel).

Once the APX line becomes more popular/widespread, I'd fully expect to see a lot of systems going this way.
 
ATCTech

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Got real bored with Peel P25 so I switched back to logging Metrolinx today. T/G 304 popped up once, presumably another enforcement channel but I wasn't here to note the audio.

I also noticed 48 and 501 operating "in parallel", meaning the same call shows up on Unitrunker against both talk groups all the time.
 
mikewazowski

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48 is the TTR Channel in FDMA mode while 501 is the same channel in TDMA mode.
 
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