MRRS System (MTA PD)

Alarms50

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Jan 26, 2003
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Ossining, NY
True. I wish, but DES will likely never let that happen; they are very protective of their system. But that's another rabbit hole discussion for later, lol.

I bet we will see every PD agency in the county go to MRRS at some point before they join A66 and DES will be left to figure out what they did wrong.

Westchester County is "protective" of it's system because it needs to provide a level of service to it's subscribers (Fire, EMS, BeeLine bus, WCPD, etc.), whether during "normal" operations, or during times when the system is stressed (weather events, emergencies, etc.). With the limited number of channels available in the system (and there being no channels/frequencies available to expand the system) there have been calculations produced that during times of stress, the system will start producing "bonks" to subscribers. This is something that, during emergencies you do not want that to happen. There is research going on to possibly expand the capacity of the system, and it may happen sooner than expected, but there is a LOT of work being done "behind the scenes" that is not available for publication right now.

So. the key reason, is that there are not enough channels available in the current configuration to provide consistent service even during times of heavy usage (which is what the system is required to do so that all communications can get through, even in heavy usage times).
 

SCFDCOMM

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I have been all over the Island with the 436 (month and a half ago) and did not receive it in Nassau. I get a full scale hits on Rt 27 in North Patchogue (Suffolk) but lose it when trying to hunt it down a mile and all directions. Get full scale @ William Floyd pkwy out in Mastic (Suffolk) but could not pin point it. Was not coming from Mastic rail. Checked Ronkonkoma rail and could not obtain a signal. Went North up to Hauppauge and could not obtain a signal. Checked Patchogue rail and determined Zone 1 is transmitting from there.

Running 2 instances of SDRT, one on Zone 1 and the other on 161. In 24 hours 161 had 10 gps locations broadcast and Zone 1 had close to 50.


Zone 1. Nothing East of Ronkonkoma

View attachment 170314



161 Has hits East of Ronkonkoma with nothing West of Garden City (Nassau) and nothing past Port Chester.

View attachment 170315



If only someone on Long Island had a KrackenRf ;)
The SRD you're using imprints data hits on a google map? What software and add on are you using?
 

dave3825

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The SRD you're using imprints data hits on a google map? What software and add on are you using?


Since that post I received a bunch of PM's asking about it and was just coming to post.

SDRTrunk Nightly build is decoding the gps data (on MRRS) and plotting it on the map in the map tab. There are some radios on MRRS Zone 1 and site 161 that transmit invalid location data and will show in the events window. These no longer show up on the map as of 10/2 I believe.

If anyone is doing events filtering, GPS in Data calls needs to be checked.

1728491667731.png
 

SCFDCOMM

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Since that post I received a bunch of PM's asking about it and was just coming to post.

SDRTrunk Nightly build is decoding the gps data (on MRRS) and plotting it on the map in the map tab. There are some radios on MRRS Zone 1 and site 161 that transmit invalid location data and will show in the events window. These no longer show up on the map as of 10/2 I believe.

If anyone is doing events filtering, GPS in Data calls needs to be checked.

View attachment 170499
Thank you for the info. Can this run with only one SDR dongle just for CC decoding? I ask because I believe I've read that some programs require two. I have no interest in decoding voice.
 

dave3825

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The gps data is not transmitted on the cc, so if the dongle does not cover the spread of the site your on, you will miss some gps data.
 

seagravebuff60

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Thank you for the info. Can this run with only one SDR dongle just for CC decoding? I ask because I believe I've read that some programs require two. I have no interest in decoding voice.
Yeah, the program in his screenshots is SDR Trunk. IMO, it's great, but there is no way to customize the map's UI fully. Zones 2 and 3 also carry GPS data. I'm not 100% sure if DSD+ does the same.

The number of dongles depends on what site you are monitoring. For example, if you are Monitoring Zone 3, Take the highest Frequency of the Site (773.03125) and subtract that from the lowest frequency of the site (769.90625), and you will get the spread of the site, which is 3.125 MHz for Zone 3. So one RTL-SDR (2.4 Spread) won't cover it. I use My SDRPlay to monitor Zone 2 with an SDR Trunk and an RTL to monitor it in UT.

However, if you want to monitor only the CC and are not interested in GPS data and voice calls, I suggest using Unitrunker to log the system activity. Unitrunker outperforms DSD+ and SDR Trunk combined regarding logging and tracking info such as RIDs, TGs, Neighbors, site activity, etc.
 

dave3825

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Zones 2 and 3 also carry GPS data. I'm not 100% sure if DSD+ does the same.

DSDPlus is not picking it up like SDRT.


2024.10.10 11:51:18 [F8S1-4V]]
2024.10.10 11:51:18 MAC_IDLE Null Information
2024.10.10 11:51:18 MAC_IDLE Group Voice Channel Grant Update PRI4 TG=9094 ch=9-386
2024.10.10 11:51:18 MAC_ACTIVE Locn: INVALID DATA
2024.10.10 11:51:18 [F0S1-4V]]
 

ericg123

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Dec 13, 2007
Messages
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Location
Westchester County, New York
I have a Uniden BCD325P2 scanner and have this system programed into the scanner but can't get Voice on it for zone 3 Westchester Police departments. I have it programmed like my SDS100 scanner which receives Westchester City, towns & village police just fine. I do not know if my 325P2 scanner is able to decode the voice or is it something else going on. for example, I just received I Harrison PD on SDS100 But not on my 325P2. I would like some help with this. thank you.
 

k2hz

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Rochester, NY
I have a Uniden BCD325P2 scanner and have this system programed into the scanner but can't get Voice on it for zone 3 Westchester Police departments. I have it programmed like my SDS100 scanner which receives Westchester City, towns & village police just fine. I do not know if my 325P2 scanner is able to decode the voice or is it something else going on. for example, I just received I Harrison PD on SDS100 But not on my 325P2. I would like some help with this. thank you.
See the numerous posts on here about 325P2 and other non SDS or Unication scanners issues with P25 simulcast. Basically the scanner is not designed to properly receive P25 LSM simulcast.
 

GTR8000

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Oct 4, 2007
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BEE00
I have a Uniden BCD325P2 scanner and have this system programed into the scanner but can't get Voice on it for zone 3 Westchester Police departments. I have it programmed like my SDS100 scanner which receives Westchester City, towns & village police just fine. I do not know if my 325P2 scanner is able to decode the voice or is it something else going on. for example, I just received I Harrison PD on SDS100 But not on my 325P2. I would like some help with this. thank you.
Already asked and answered last month.

 

Tank67

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Aug 25, 2018
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New York
FDMA TG 1000 has started showing up on the Metro simulcast with encryption. Seeing NYSP and I believe MTA Police UIDs (7720### and 420####).

Also saw TG 1992 for a brief moment
 
Last edited:

dave3825

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Zone 1 stopped using 774.28125 in July. September they started using 774.09375.

1729902651734.png

Sdrtrunk not showing it in details but showing in now playing.





1729901596469.png

Code:
Network
  WACN:91FE8[597992] SYSTEM:26E[622] NAC:015[21] LRA:15[21]

Current Site
  SYSTEM:26E[622] NAC:015[21] RFSS:15[21] SITE:15[21] LRA:15[21]  STATUS:ACTIVE RFSS NETWORK CONNECTION
  PRI CONTROL CHANNEL:1-193 DOWNLINK:770206250 UPLINK:800206250
  SEC CONTROL CHANNEL:1-311 DOWNLINK:770943750 UPLINK:800943750
  SEC CONTROL CHANNEL:1-727 DOWNLINK:773543750 UPLINK:803543750
  SEC CONTROL CHANNEL:1-771 DOWNLINK:773818750 UPLINK:803818750
  CURRENT DATA CHANNEL:0-0 DOWNLINK:851000000 UPLINK:851000000
  AVAILABLE SERVICES:[EXTENDED_SERVICES, EXTENDED_SERVICES_EXTENSION, NETWORK_ACTIVE, GROUP_VOICE, INDIVIDUAL_VOICE, INDIVIDUAL_DATA, UNIT_REGISTRATION, GROUP_AFFILIATION, GROUP_AFFILIATION_QUERY, ENCRYPTION_SETTINGS, USER_STATUS, USER_MESSAGE, UNIT_STATUS, USER_STATUS_QUERY, UNIT_STATUS_QUERY, EMERGENCY_ALARM]  SUPPORTED SERVICES:[EXTENDED_SERVICES, EXTENDED_SERVICES_EXTENSION, NETWORK_ACTIVE, GROUP_VOICE, INDIVIDUAL_VOICE, INDIVIDUAL_DATA, UNIT_REGISTRATION, GROUP_AFFILIATION, GROUP_AFFILIATION_QUERY, ENCRYPTION_SETTINGS, USER_STATUS, USER_MESSAGE, UNIT_STATUS, USER_STATUS_QUERY, UNIT_STATUS_QUERY, EMERGENCY_ALARM]
Neighbor Sites
  SYSTEM:26D[621] NAC:015[21] RFSS:01[1] SITE:01[1] LRA:01[1] CHANNEL:0-83 DOWNLINK:852037500 UPLINK:807037500 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
  SYSTEM:26E[622] NAC:015[21] RFSS:51[81] SITE:51[81] LRA:51[81] CHANNEL:1-189 DOWNLINK:770181250 UPLINK:800181250 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
  SYSTEM:26E[622] NAC:015[21] RFSS:A1[161] SITE:A1[161] LRA:A1[161] CHANNEL:1-65 DOWNLINK:769406250 UPLINK:799406250 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
 
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