Large SoCal NXDN System

Now that there has been an increase in members with NXDN capable radios, I have received several submissions for NXDN trunked systems.

While it appeared initially several of these were standalone systems, upon further research based on noting the same System ID and common TGs, appears they are part of a much broader SoCal system with couple dozen licenses in names of Mark Abrams, DK Automotive, Mobile Relay Associates, Summer Hansen, etc

I am hoping we can use this thread to work out additional details before I build the system for the Db.

Here is what we have so far:

System 31:

Site 1
506.325
506.35
506.575
506.65
507.6
507.85
508.1
508.675
508.7

Site 2
470.7
471.275
471.3
506.475
507.425
507.55
508.5
508.525
508.55
508.725
508.75

Site 3
471.475
472.35
472.375

Site 4
451.4
471.4
471.7

Site 5
451.9875
471.4875
471.55
471.575

Site 7
507.4375-control
508.35

Site 8
507.775
508.425-control

Site 10
472.225

Site 11
472.25
507.375
507.875-control
508.325
508.6
508.9

Site 12
451.95
452.675

Site 17
451.575

Site 26 - reported as San Savaine Peak in SB County
LCN800 471.25
LCN803 471.3125
LCN904 472.9875

Some common noted talkgroups are

54 - LA Co. Ambulance
98 - Ambulance
107 - LA Co./Northern OC Ambulance
168 - Trucking
187 - Bus line
190 - Bus line
209 - Private security company (ACS?)
243/244 - San Bernardino Freeway Service Patrol
245 - Tow


Would appreciate any additional input as to potential locations of noted sites, frequency LCN order, plus new sites, frequencies and talk groups.

Happy hunting!

Some more notes on MRA 31 System here and FCC License links that's used on the system.
http://www.scanriverside.com/forums/viewtopic.php?f=61&t=1090

Restricted Info wiki page.
RadioReference has restricted access to the public for all Mobile Relay Associates ("MRA") trunked system information stored in the RadioReference Database (RRDB).
http://wiki.radioreference.com/index.php/Restricted_Info

RadioReference receives a letter demanding removal of Mobile Relay Associates SMR
https://forums.radioreference.com/c...ding-removal-mobile-relay-associates-smr.html

RadioReference Formally Responds to MRA Demand to remove information
https://forums.radioreference.com/c...y-responds-mra-demand-remove-information.html

In the past on the forum on the other thread, one of the moderator said....

scannerfreak said:

Folks, I removed the LCN and talkgroup info per the sites current policy on this system.
Please refrain from posting further LCN and talkgroup info in the forums on this system. Also, please do not debate this issue. The site has made a decision on this and it's not open for debate
Thanks for your understanding

Click to expand...

Thanks MtnBiker2005.

Yes aware of MRA restriction, however the bulk of licenses for frequencies identified do not come back to MRA, so frankly I am not sure who it belongs to.

Mark Abrams
https://www.radioreference.com/apps/db/?fccCallsign=WQMJ785
https://www.radioreference.com/apps/db/?fccCallsign=WQLC474

DK Automotive
https://www.radioreference.com/apps/db/?fccCallsign=WQLA268
https://www.radioreference.com/apps/db/?fccCallsign=WQOM739

Hansen, Sumner
https://www.radioreference.com/apps/db/?fccCallsign=WQMJ767
https://www.radioreference.com/apps/db/?fccCallsign=WQXQ255
https://www.radioreference.com/apps/db/?fccCallsign=WQMH937
https://www.radioreference.com/apps/db/?fccCallsign=WQKV329

NATIONAL SCIENCE AND TECHNOLOGY NETWORK, INC
https://www.radioreference.com/apps/db/?fccCallsign=WQIP838
https://www.radioreference.com/apps/db/?fccCallsign=WPPH728
https://www.radioreference.com/apps/db/?fccCallsign=WQJS443
https://www.radioreference.com/apps/db/?fccCallsign=WPMM916

M2M Enterprises
https://www.radioreference.com/apps/db/?fccCallsign=WQYF769

While these MRA licences have potential links to this system so far:
https://www.radioreference.com/apps/db/?fccCallsign=KXK718
https://www.radioreference.com/apps/db/?fccCallsign=WPPZ602
https://www.radioreference.com/apps/db/?fccCallsign=WQBZ908
https://www.radioreference.com/apps/db/?fccCallsign=WQLA446
https://www.radioreference.com/apps/db/?fccCallsign=WQYB315


Regardless, however we still have many MRA systems built and kept current in the Db with submissions.
However as per policy have them set to "No Display". In LA County alone I have maintained 10 MRA LTRs over the years.

some of the MRA frequencies are indeed not licensed to them, the site at Rancho Cucamonga is one such
its listed as another company

Example on the Rancho Site
471.25 is M2M
472.9875 is Mobile Relay
471.3125 is Mobile Relay

and if you look at the licenses they occupy the same tower

then look at the letters and the contact info on the FCC ULS page

and in RR's defense its not like these sites are that hard to figure out, im finding that NXDN sites are pretty easy compared to DMR

LAflyer said:

Thanks MtnBiker2005.
Yes aware of MRA restriction, however the bulk of licenses for frequencies identified do not come back to MRA, so frankly I am not sure who it belongs to.

Click to expand...

Those names do come back to MRA per this letter on the FCC site.
Plus some of the licenses already changed the name to MRA... or under company owners name.
https://wireless2.fcc.gov/UlsEntry/...tachmentKey=18461096&attachmentInd=applAttach

FWIW, Mark Abrams is one of the owners of MRA.

Also, looking at the coverage maps on their website, it lists site names and numbers, which appear to jive nicely with what I have logged over the last several years with DSDPlus and Mtnbiker's logs.
It is not all-inclusive, but the major sites are shown.

Sent from my SM-G935V using Tapatalk

How to program these sites into a 436hp

Can someone provide some guidance on how to manually program these new NXDN systems into the Uniden 436hp? I got the upgrade, but am having difficulty determining how to (step-by-step) program a NXDN system into my scanner? I want to listen to the KABC sites, and some of these newly revealed systems to get my feet wet in the NXDN realm.

Thanks...

Here is another interesting read, which provides some history on the various licensees / potential ties to MRA.

https://wireless2.fcc.gov/UlsEntry/...tachmentKey=18479129&attachmentInd=applAttach

Mike

LZJSR said:

Can someone provide some guidance on how to manually program these new NXDN systems into the Uniden 436hp? I got the upgrade, but am having difficulty determining how to (step-by-step) program a NXDN system into my scanner? I want to listen to the KABC sites, and some of these newly revealed systems to get my feet wet in the NXDN realm.

Thanks...

Click to expand...

Select favorites list
Add new NXDN trunk system
Build each site with the assigned site frequencies including its LCN number and RAN code as shown in the DB
Add talkgroups or enable TG search.
KABC is a pretty quiet system unless something newsworthy is happening.

For unknowns, you have to find the site frequencies (may have the same RAN), build a site and use the LCN finder to determine the LCN numbers.


Sent from my SM-G935V using Tapatalk

MtnBiker2005 said:

Those names do come back to MRA per this letter on the FCC site.
Plus some of the licenses already changed the name to MRA... or under company owners name.
https://wireless2.fcc.gov/UlsEntry/...tachmentKey=18461096&attachmentInd=applAttach

Click to expand...

wow very interesting

Another Letter
https://www.fcc.gov/document/mobile-relay-associates-0
https://www.fcc.gov/document/mobile-relay-associates-4

they dont like to play by the rules

Thank you!