Metrolinx Rail Traffic Control

mbstone99

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Tonight I am hearing automated locomotive alarms on 160.9500 NXDN96 RAN 0 TG 0. It's 4am and I am still hearing them every 10-15 minutes.

Matt
 

mciupa

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That would be the Signal Department at MacMillan Yard just north of Toronto.
 

mciupa

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After some dormancy, I am noticing 161.550 has come back to life today.

Also a new channel AAR 397= 160.890 both have a RAN of 1
 

mciupa

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Add AAR 329 = 160.380 and AAR 377 = 160.740 for today.

RAN 1
 

mciupa

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Could be, on 161.22 I'm only getting static.

One I noticed yesterday was 160.77 RAN 1. I've heard them down at VIA's Toronto Maintenance Centre with clear NXDN in the past. Now they are just sending out a signal with no voice.
 

ATCTech

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The "view" from here shows NXDN48 on DSD+ and very healthy signal strength.

EDIT: Graphic deleted.
 

mciupa

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Weak signals also on 160.32, 160.44, 160.71, 160.92

Cannot confirm RAN 1
 

ATCTech

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Confirming all 4 of those out here, 160.320 being very weak compared to the rest. RAN 1 confirmed on all.
 

gary123

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As usual I'm out of range for activity on there frequencies. I have to ask the basic question... is this a trunked network or is is just a set of freq where NXDN has been heard in use?
 

mciupa

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I have them being tested as NXDN One Frequency Trunk currently in my BCD 536HP. I wish I could find out Channel ID's and system ID.

At this time, they are only transmitting talkgroup 0 and RAN 1 from various Metrolinx locations.
 

gary123

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They could still be simplex frequencies. P25 DMR NXDN and even dPMR all allow radios to be simplex with a TG used as a PL/DPL. This would also explain why the signals are very local and not covering a huge distance. A second check would be to look at the signal levels anything part of a network should have all users the same signal strength. If each user is a different signal strength this would also tend to indicate a group of simplex channels operating in NXDN.
 

ATCTech

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I think we're seeing a discrete frequency come to life on all the new towers being populated at Metrolinx locations, obviously focusing on the rail stations over the bus depots. Once they go (no pun intended!) fully operational, I'm curious if they'll rebroadcast the mobile (train) transmissions across other towers or be truly pure simplex on a site by site basis.

There would however have to be some kind of automation to keep the mobile radios on the appropriate frequency if that's the case. There's a fair bit of microwave hardware on most of them, so site linking looks likely.
 

gary123

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ATCT good point. It is possible that the separate freq are being linked via microwave/hardline or IP to the various stations. This is similar to what CN is doing for their main line freq. RTC (Montreal) sees the receiver that is active and autoselects the transmitter site associated to that receiver, this may something similar. I highly doubt each station has 10 or so radios set up for the freqs people are hearing activity on. This does not rule out a freq agile transmitter/receiver at the station. GO RTC could be selecting it and telling it to use 16x.xxx at station XXXX.
 

ATCTech

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Agreed 100% Gary. Position locating equipment onboard the power unit/cab car could (already does?) determine the appropriate tower for RTC-initiated comms as well.
 

ATCTech

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160.650, 160.830, 161.130 and 161.190 NXDN48 with RAN=1 on the air too, weaker RF levels for all 4 compared to already documented channels. I don't see any of them in the known NXDN yard frequencies.
 
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