LMRN Technical Data Discussion

[Thunderbolt]

I found a P-25 control channel on 142.935 MHz last night, but it was way too weak to decode where I live at west of Windsor.

73's

Ron

 

[ATCTech]

Just noticed we have a solid P25 signal once again with the 1038 Hz tone on 142.410 MHz. I'm in central Halton county, west of Mississauga. SDR# shows it about 20dB lower in level at my location than the 142.605 P25 carrier reported a few weeks back

 

[sensationalseagull]

Just noticed we have a solid P25 signal once again with the 1038 Hz tone on 142.410 MHz. I'm in central Halton county, west of Mississauga. SDR# shows it about 20dB lower in level at my location than the 142.605 P25 carrier reported a few weeks back

I'm in Guelph and I'm also getting a P25 signal on 142.410 MHz and hearing a 1030 Hz tone:

2021/12/20 18:23:45 Freq=142.410000 FM demodulated P25p2 PSK signal detected; forcing P25p2 PSK demodulation 2021/12/20 18:23:45 Freq=142.410000 Group call; TG=1 RID=1 Pri1 14m28s

I believe that it's transmitted from the Woodlawn Fleetnet tower. The signal strength is the same as 143.100 MHz, the control channel for 12WDLN.

Not sure if related, but last week the main control channel frequency for 12WDLN was down twice (Tue & Wed night). I know that the second outage on Wednesday was planned in advance because EMS switched over to PCOM a few minutes before 9PM. In the end, some frequencies were shuffled around:
-141.975 is now a voice frequency
-143.940 is now the alt control channel
-143.955 is no longer used

 

[ATCTech]

Thanks for the detailed observations. 142.410 was part of the original FleetNet site 1 that the City of Guelph services were once on and has never been reassigned in the area. It's likely more than just a coincidence that it's back on the air in this form up there. If there's still physical access to the original downtown site by BMR they may even be utilizing it for this one.

 

[32dave]

The data channel for LMRN Oxford just went dead

 

[Muxlow]

Looks like we had a couple transmissions off site 16 Chatham TD 2007 RID 200069.
Site freqs

142.320 control
142.515
142.545-1 P2
142.545-2 P2
142.740
142.980

 

[ATCTech]

143.130 sporting a nice clean 1030 Hz tone in P25P2 mode tonight. I don't that freq associated with Zone 1 or Zone 2 FleetNet.

 

[Muxlow]

Lambton has a P2 control channel blasting the same test tone on 142.380

 

[slicerwizard]

A control channel? Really?

 

[ATCTech]

Just spotted another new P25 carrier with the 1030Hz tone on it, this time 142.050 and not to be confused with the 142.005 discovery noted back in November. (I can see/hear both freqencies as I write this.) If this one was already known but I'm only seeing it now because of a change in propagation my apologies for the duplication.

 

[mciupa]

I'm going to guess you are pulling in Cedarwoods (Kitchener) on .05

 

[ATCTech]

Reference my post last night regarding 142.050 having the P25 test tone active somewhere in the southern Ontario/GTHA vicinity.
Here's my really stupid (and admittedly slight off-topic) question, but where is there any reference to 142.050 being logged on-air in this forum/sub-forums?
I looked last night and again today and only see 142.005 being made mention of with a P25 signal active. I thought 142.050 sounded very familiar prior to posting last night. Darned if I can find it in these pages then or now (in the Zone 1 coverage area specifically I guess I should add. Although, that's not a factor from what I didn't turn up.)

Or, was the reference to it perhaps being Cedarwoods related to known use of the frequency on FleetNet and I'm imagining seeing it in relation to LMRN previously?

Us old guys become forgetful really quickly!

 

[ATCTech]

I've finally got enough RF level to confirm there's a P25 test tone signal on 143.085. It's looked like a P25 carrier on the display for weeks but was never strong enough to decode. Tonight the conditions have changed enough that it's confirmed.

 

[ATCTech]

Can you guys outside the GTHA check 143.085 for a P25 signal (1030 Hz test tone like the others)?
As I posted in the findings sub-forum this one has been lurking just close enough to the noise floor to be unconfirmed until tonight from my location.
It's not Hamilton (calls on that site clobber this one regularly) and is half the signal level of that site for me. And it's not Edgar as I see voice traffic on Fleetnet from that site now.

 

[gary123]

I am in Perth East today. The 143.085 carrier is coming off the Stratford tower Site 33. If get a few. I'll try and grab site info.

 

[gary123]

I meant to update ATCTechs post. 143.085 is located in Tavistock.

Andy: Slowly sites are being added and behind the scenes radios are being changed out. There is still a hardware shortage so its going to be a while yet before any transitioning occurs. The first sign of things moving on will the be the CC changing from the test mode (1030hz tone) to CC mode with a SID and other CC header packets.

 

[ATCTech]

Thanks Gary, a bit of a reach for me due to the Escarpment but with Woodstock also being do-able most of the time from here that makes perfect sense.

I have checked 140-144MHz 3 or 4 times a week and I've seen no activity beyond what I've reported in the other sub-forum for the last month.

 

[Andy_SDS100]

I meant to update ATCTech's post. 143.085 is located in Tavistock.

Andy: Slowly sites are being added and behind the scenes radios are being changed out. There is still a hardware shortage so its going to be a while yet before any transitioning occurs. The first sign of things moving on will the be the CC changing from the test mode (1030hz tone) to CC mode with a SID and other CC header packets.

So 143.085, would I put that under LMRN or FleetNet?

 

[ATCTech]

As with all of the noted active (on test) frequencies in the other sub-forum, 143.085 is being assigned on both systems but at different locations so the choice is yours. Expect to see all of the current FleetNet frequencies re-purposed to LMRN over time as available bandwidth is at a premium in that range with 15 kHz spacing.

 

[gary123]

It's a LMRN site. Kind of halfway between the Oxford and Stratford sites.

Again I concur with ATCTech. They are taking one freq from every FleetNet site and making it the new PSRN CC for that area. When they start transitioning they will change frequencies from FleetNet to LMRN use as needed.