New Mexico DTRS

[ShyFlyer]

When I am at home (Colorado), I never had an issue monitoring the Douglas North site (Colorado DTRS) with my 436. While mobile, any simulcast site was just a pain in the...well, you know. When I lived in ABQ, City Simulcast was sometimes an issue, but not as bad.

Having an SDS100 now, the performance is by far better. I had considered a G5 but it didn't fit my needs.

One thing the radio engineers can do is block talkgroups on sites.

One would hope that the engineers create "travel" talkgroups like many agencies have on the CO-DTRS. However, that doesn't stop talkgroups being dragged where they should be as evidenced by the emails I get with admonitions on doing so when there are "events" in the DEN metro with agencies from all over the state participating (LODD funerals, etc).

 

[Rad-1]

Ok Gotcha Abqscan. That link you sent really demonstrates the benefits.
If it also allows VHF and UHF reception I might order one and test it out. I am inclined to wait until the system is up and fully functional though before I pull the trigger on something pricey like that. If any of it goes the big E won’t matter what we monitor with.

 

[ChrisABQ]

I use my 436 and I'm located only a half mile from the nearest tower. I do see new antennas on the tower, so my hope is that the new system will be on it. Being so close, I'm not really expecting the distortion issue because of distance and the fact I don't use it for mobile.

 

[abqscan]

I use my 436 and I'm located only a half mile from the nearest tower. I do see new antennas on the tower, so my hope is that the new system will be on it. Being so close, I'm not really expecting the distortion issue because of distance and the fact I don't use it for mobile.

To get technical, P25 simulcast systems use a different type of modulation (Linear Simulcast Modulation) to help with the time delay interference issues and this is what causes the majority of issues for scanners. The simulcast reception issues scanners have isn't from a lack of signal, but getting the singal multiple times just nano-seconds apart which causes distructive interfence in the radio. The SDS100/200 are the only scanners designed to properly decode LSM. The Unication G4/5 are also designed to decode this moduation.

As the video shows I posted before, the scanners had full signal, they just couldn't decode the 1s and 0s properly. This document helps describe the different modulations and why 0.000025 of a second matters!

https://www.taitradio.com/__data/assets/pdf_file/0007/156076/White-Paper_P25-SimulcastCoverage.pdf

Check these out too!

https://36m2mc1k7ahftbzer1nb9dbt-wpengine.netdna-ssl.com/wp-content/uploads/2018/10/Coverage_low-res_4-14.pdf

https://www.wirelessinnovation.org/assets/Proceedings/2011/2011-6b-taylor-presentation.pdf

StackPath

 

[CurtisPayne145]

hey guys, just moved to Albuquerque and wanna program my scanner so i can listen and i know that they're gonna be on the P25 system, just trying to gather some info is APD, AFR, BCSO, BCFD all unencrypted or encrypted on that system?

 

[abqscan]

It sounds like the dispatch channnels will be in the clear. Make sure you have a scanner that supports TDMA on P25.

 

[CurtisPayne145]

ok i just wanna confirm that's all dispatch channels for all 4 agencies?

 

[abqscan]

ABQ Police is the only confirmed agency so far. We have heard BCFD distpach in the clear but, we know that can easly be changed with a click of a mouse.

 

[CurtisPayne145]

i don't plan on monitoring those myself, the BCFD question is for my friend lol, i only intend on monitoring my new favorite department ABQ PD & FD and hopefully AFR & BCSO as well, thanks brother! i appreciate it.

 

[Rad-1]

Welcome to Abq CurtisPayne145. They haven’t made the switch to the new system yet. Still on the EDACS ProVoice. Think they are still building out and testing on the NM DTRS. BCFD Dispatch was active prior to the holiday. Heard some testing again today on TG 1091 TDMA

 

[CurtisPayne145]

Thanks Rad so far enjoying my move, now the only problem i have is trying to get accustomed to the new time zone as i'm from Virginia lol

 

[Rad-1]

Thanks Rad so far enjoying my move, now the only problem i have is trying to get accustomed to the new time zone as i'm from Virginia lol

Yep I understand. Takes a while to get used to the time zone difference. Happy monitoring! Should be an interesting year with the switch over to the NM DTRS and new Phase 2 TG’s coming online.

 

[ChrisABQ]

Rad, what information do you have for Site 0A (10)? I found a control channel on 769.15625 and seem to think it's to the South or East. Can you receive it and possibly obtain a frequency list?

 

[ChrisABQ]

Plugged in Site 10A primary control channel 769.15625 in SDRTrunk and located secondary control channels of 769.94375, 770.20625 and 770.93125 NAC 850

 

[CorwinScansNM]

Plugged in Site 10A primary control channel 769.15625 in SDRTrunk and located secondary control channels of 769.94375, 770.20625 and 770.93125 NAC 850

Looking forward to this new info to be submitted to the Radio Reference Database which I check daily. Great work guys! Keep it up.

 

[Rad-1]

Hi Chris.
The only info I have for site-10A is the primary control channel 769.15625 confirmed which I pulled from my Pro96com log when I logged
Site-111 and you identified as the County911Center (Abq-NE). I wasn’t able to log site-10A from my location in East Downtown. Too far away from the site apparently to grab on to the control channel data. I don’t think this site is south as I would pick it up from my location. It might be extreme west side or NW by Rio Rancho maybe? Sweet! you got the alt control channels for it though.

 

[Rad-1]

Gentleman,
I decided to do some war driving this afternoon to try and identify Site-110 (10A). It appears to be the Nob Hill (ABQ-SE) site located at Burton Park. Here is the log from Pro96com:

FileVersion:8
-TowerInfo
#This section is here for information only. With the exception
#of the Call Sign(s), This data is not Read back into the program at all.
System ID : 854
System Name :
WACN : BEE00
Tower Number (Decimal): 1-10
Tower Number (Hex) : T010A
Tower Description :
Control Capabilities : Data,Voice,Registration
Flavor : Phase 2
Call Sign(s) : WPTZ778
Timestamp : Fri Jan 1 17:52:02 2021

-Tables
#Format: Table ID,Base Freq,Spacing,Input Offset,Assumed/Confirmed,BandWidth,Slots
00,851.00625,0.00625,-45.00000,"Confirmed",0.01250,1
01,762.00625,0.00625,30.00000,"Confirmed",0.01250,1
02,851.01250,0.01250,-45.00000,"Confirmed",0.01250,2
03,762.00625,0.01250,30.00000,"Confirmed",0.01250,2
04,935.01250,0.01250,-39.00000,"Confirmed",0.01250,1
05,935.01250,0.01250,-39.00000,"Confirmed",0.01250,2

-Frequencies
#Format: Channel,Usage,Frequency(/Slot),Input Channel,Input Frequency(/Slot),Input Explicit(1/0),Hit Count
"01-1144","c",769.15625,"01-1144",799.15625,0,0
"01-1270","a",769.94375,"01-1270",799.94375,0,0
"01-1312","a",770.20625,"01-1312",800.20625,0,0
"01-1428","a",770.93125,"01-1428",800.93125,0,0
"01-2008","v",774.55625,"01-2008",0.00000,0,1
"01-2048","i",774.80625,"01-2048",804.80625,0,2

-Neighbors
#Format: TowerID,TowerIDHex,System ID,Channel,Frequency,Tower Name
104,"T0104",854,"01-1146",769.16875,""
105,"T0105",854,"01-1194",769.46875,""
106,"T0106",854,"01-1152",769.20625,""
111,"T010B",854,"01-1192",769.45625,""

 

[ChrisABQ]

Great job Rad! Just seemed to be stronger in that direction, thanks for confirming.

 

[ChrisABQ]

I have been logging activity on this site today. Here is the frequencies thus far:
Site 10A Frequency list:
769.15625c
769.94375a
770.20625a
770.93125a
773.08125
773.28125
773.53125
773.80625
774.55625
774.80625
774.05625
774.30625

 

[Rad-1]

The 10A site appears to be active with voice traffic already. I heard D5 audio on it