VHF Federal 4D5 System

[officer_415]

Starting a new thread in the statewide forums in the hopes that people outside the Bay Area can help nail down some of the unknown sites on this system. System seems to be designed for Northern California / Central Valley coverage:

US Immigration and Customs Enforcement (ICE) Trunking System, Various, Multi-State

US Immigration and Customs Enforcement (ICE) Trunking System Profile

www.radioreference.com

Previous discussion in the SF Bay Area forum:

173.7875 P25 Phase 2 Control Channel

I found a P25 Phase 2 control channel on 173.7875 with no voice activity yet. Using Pro96Com and UniTrunker, I see the following values for the system: System ID: 4D5 RFSS: 003 Site ID: 067 WACN: BEE00 Anyone have any idea who may be using this? I'm hearing this from the San Leandro hills.

forums.radioreference.com

 

[GTR8000]

Chances are this is another USMS system similar to the one we have in the NY Metro area. Although the USMS is the owner of the system, other federal agencies are also using the system and have their own talkgroups provisioned. Full time AES-256, to no surprise.

U.S. Marshals Service Trunking System, Regional, Multi-State

U.S. Marshals Service Trunking System Profile

www.radioreference.com

Edit...I take that back, it's not the USMS, but it is very similar to the one we have on this coast. Happy hunting!

 

[scannerboy02]

I saw some ICE budget request documents online a few weeks ago that made reference to a "TACCOM" system in the San Francisco area that, may be this system. It also mentioned systems in Atlanta, Boston, Denver, Miami, Tampa and New Orleans. The budget requests were for funding to expand the system to Puerto Rico and the Virgin Islands. It says the system "will minimize redundancies and/or communications gaps that exist between DHS components and other Federal, State, and local partners."

It's also possible this TACCOM is something completely different.

 

[ChrisP]

Scannerboy02, I concur with your conclusions.

I also have seen some information on the 4D5 system being managed by ICE and used by ICE, CBP and other DHS agencies in the region.

- Chris

 

[officer_415]

Site 71 - heard in Sacramento and Patterson
Site 72 - heard in Visalia
Site 79 - heard in Sacramento
Site 83 - heard in North Tahoe

 

[kg6nlw]

Site 70 (Mt. Saint Helena) is showing a new frequency of 173.550 as 10-3004 which has been submitted to the DB.

I have also seen a TG of 113 come up multiple times today with RID 6613038.

Regards,

-Frank C.

 

[officer_415]

I've updated the neighbor lists and locations for all the known sites, and I'd like to propose the following for the unknown sites:

Site 71 - Mt. Oso
Site 72 - San Benito Mountain
Site 79 - Mt. Bullion

I also believe Site 66 may be Black Mountain (SLO, next to the Paso Robles FAA radar site), and Site 83 may be Mt. Rose (NV, North Tahoe). If anyone in these areas can monitor and confirm, that would be awesome.

 

[kg6nlw]

Early this morning Site 70 had TG's 10 and 12 show up with similar RID's as before.

Regards,

-Frank C.

 

[kg6nlw]

Just a small update that I've noticed the last few days...This is all heard off the Mt Saint Helena site via DSD+FL

Mt Tam, Mt Diablo, Mt Vaca, Big Signal Peak (Mendo Co), and Site 84 all report ISOLATED/Site down status and then back up shortly thereafter. Site 84 shows "Info Outdated" as well.

Regards,

-Frank C.

 

[officer_415]

Site 84 all report ISOLATED/Site down status and then back up shortly thereafter. Site 84 shows "Info Outdated" as well.

Site 84 is Montara Mountain (San Mateo County)

 

[kg6nlw]

Site 84 is Montara Mountain (San Mateo County)

Good to know! These are just the findings I know.

Regards,

-Frank C.

 

[kg6nlw]

Various TG's and RID's have shown up on Mt Saint Helena the last few days, including TG 149. No actual talking, just affiliations or rejections.

Regards,

-Frank C.

 

[AM909]

I can report nothing heard in LA, OC, and parts of Riverside and San Bernardino. Unknown areas include anything north/east of the Inland Empire.

 

[AM909]

... and not most of the high-level sites in San Diego County, based on a survey a few weeks ago from up high in Fallbrook. Imperial County is an unknown as well.

 

[officer_415]

I can report nothing heard in LA, OC, and parts of Riverside and San Bernardino. Unknown areas include anything north/east of the Inland Empire.

Yeah it seems to be a NorCal system.

 

[officer_415]

Site 69 is back online.

 

[officer_415]

I'm fairly confident Site 83 is Mt. Rose. It's pretty weak in South Lake Tahoe, then very strong at higher elevation on Tahoe Mountain with good line of sight to Mt. Rose. Anything on the Placer County side of the lake should come booming into SLT.

 

[officer_415]

I just drove Highway 101 from the Bay Area to Santa Barbara and never picked up sites 85 or 66, so I’m not sure where they are.

85 might be on the coast (maybe Big Sur?) and 66 might be further inland.

 

[officer_415]

A friend picked up Site 66 from I-5 near Bakersfield, so it could be McKittrick Peak.

Site 85 is becoming a bigger mystery. It doesn't seem to be along the Highway 1 or 101 corridors. Neighbors are Loma Prieta, Fremont Peak, and Williams Hill.

 

[kg6nlw]

Site 85 isn't a neighbor to any North Bay sites that I'm aware of either.

Regards,

-Frank C.