407.0125 Site: D01B - New Trucked System? in SoCal

[MtnBiker2005]

407.0125 Site D01B (Delta Zero One Bravo)

Was scanning the fed bands today. Notice this control channel.
I searched online on few sites(SoCalScan & SoCalFedCom) and couldn't find anything about it.

The signal was stronger as I was looking towards Riverside County. and maybe Orange County. Heard it around 1pm and checked again at 10:50pm tonight. Wouldn't think it be navy ship.

Hope someone has more information on this trunked system

Brian
San Diego County

P.S Sorry for the miss spelling in the title Oops!

 

[ChrisP]

407.0125 Site D01B (Delta Zero One Bravo)

Was scanning the fed bands today. Notice this control channel.
I searched online on few sites(SoCalScan & SoCalFedCom) and couldn't find anything about it.

The signal was stronger as I was looking towards Riverside County. and maybe Orange County. Heard it around 1pm and checked again at 10:50pm tonight. Wouldn't think it be navy ship.

Hope someone has more information on this trunked system

Brian
San Diego County

P.S Sorry for the miss spelling in the title Oops!

No information on this system seems to exist, Brian. I can't give you much more other than this frequency, 407.0125 MHz, has been used in several other Bureau of Prisons trunked systems. This may be a new system for a BoP facility. Keep listening and let us know what you find.

- Chris

PS - The d01b is the system ID, not the site number.

 

[MtnBiker2005]

The 2nd control channel for this system:

408.8125 D01B (Nov 21st till midnight)

 

[dste]

We seem to have a new D01A here in Seattle. Maybe the airport? It is running on 3 UHF CCs but no traffic.

 

[brandon]

408.8125 is heard but pretty weak at my location. Maybe transmitting from offshore or Orange/LA county but definitely not from March.

 

[ChrisP]

The 2nd control channel for this system:

408.8125 D01B (Nov 21st till midnight)

This frequency also used by Bureau of Prisons trunked systems in other locations.

- Chris

 

[ChrisP]

We seem to have a new D01A here in Seattle. Maybe the airport? It is running on 3 UHF CCs but no traffic.

Most likely the SeaTac Federal Detention Center has upgraded from it's conventional UHF to a trunked system. It's near the airport...

Can you post the control channels you've heard?

- Chris

 

[ChrisP]

408.8125 is heard but pretty weak at my location. Maybe transmitting from offshore or Orange/LA county but definitely not from March.

Could this be the Federal Correctional Institution on Terminal Island in LA?

http://www.bop.gov/locations/institutions/trm/index.jsp

It's the only BoP facility in the SoCal area I've never had any radio system info on. They may have upgraded to a trunked system.

- Chris

 

[dste]

Most likely the SeaTac Federal Detention Center has upgraded from it's conventional UHF to a trunked system. It's near the airport...

Can you post the control channels you've heard?

- Chris

406.6* 407.05* 407.325*

I noticed it working out the changes at McChord AFB. No users as of today. Being so close in SYSID these must be related somehow.

 

[ChrisP]

406.6* 407.05* 407.325*

I noticed it working out the changes at McChord AFB. No users as of today. Being so close in SYSID these must be related somehow.

Thanks!

- Chris

 

[MtnBiker2005]

The 3rd control channel for this system:

409. 4125 D01B (Heard 3:10am Friday, Nov 23rd till midnight)

Last report till next month.

 

[MtnBiker2005]

Update:

407.0125 D01B
408.8125 D01B
409.4125 D01B
409.2125 D01B - Sunday Control Channel Dec 9th.

Should have more info by end of this week.

 

[Mick]

For 409.4125 I have it also as a CC for MDC L.A. SID CA0B:
http://www.radioreference.com/apps/db/?sid=5297

Update:

407.0125 D01B
408.8125 D01B
409.4125 D01B
409.2125 D01B - Sunday Control Channel Dec 9th.

Should have more info by end of this week.

 

[Mike_G_D]

D01b

This thread is relatively old but I haven't seen any updated info on this system. I have been trying to track down this system and figure out the band plan for some time now. It comes in at my location very sporadically (tropo, I think). However, I think I have just cracked the setup using a combination of Unitrunker, my PSR500, and Wayne H's trunked frequency Excel calculation tables.

Here is what I have:

SysID: D01B
CT: 116.13
Base: 406.2625MHz
Offset: 380
Step: 12.5KHz

I've noted control channels on 408.8125MHz, 409.2125MHz, and 409.4125MHz (rotating). I have heard voice communications (P25 CAI) on those frequencies (when, of course, they are not being used as CC's) as well as 410.525MHz and possibly 409.3125.

These frequencies work out to the correct channel numbers reported by Unitrunker using the above settings as follows:

Ch. 584 = 408.8125MHz
Ch. 616 = 409.2125MHz
Ch. 624 = 409.3125MHz (unsure here but the channel number is valid)
Ch. 632 = 409.4125MHz
Ch. 721 = 410.525MHz

I have not confirmed the 407.0125MHz CC at my location but have programmed it in after reading this thread just in case. If correct it would be channel 440 using the settings above.

I have noted the following talk groups in use:

32, 48, and 80.

The talk groups noted above do seem to be identical to the ones noted in the MDC LA CA0B system noted by Mick but the settings are definitely different (base and offset).

Sorry if all this is old news. I searched around and this thread was the best and most current info I could find.

-Mike

 

[Mike_G_D]

more on D01B

To add to the above - I have noted voice communications concerning inmates, kitchen staff, suicide watches, and hospitals. These seem to indicate a likely detention center affiliation.

Again, sorry if everybody else already knew this!

-Mike

 

[Mick]

This is very, very cool info! Thanks a lot! No one knows for certain where this is, your info on the base and offset is new, and it's not part of RR yet. So it's terrific having your info now.

I suspect it might be FCI Terminal Island, the low security facility housing male inmates.
http://www.bop.gov/locations/institutions/trm/index.jsp

To add to the above - I have noted voice communications concerning inmates, kitchen staff, suicide watches, and hospitals. These seem to indicate a likely detention center affiliation.

Again, sorry if everybody else already knew this!

-Mike

 

[Mike_G_D]

D01b

Thanks Mick! I am not getting it at all now - that's the problem where I am - it is sometimes there and sometimes not. The signal has deep long fades and at sporadic times will boom right in for some unknown period of time. That's tropo for ya!

So, when I happen to check it and it happens to be "in" I jump on the chance to dink with it! After a long (about 2 months or so) period of no signal here I finally got a good chance yesterday so I really worked on it. I was also testing the new Unitrunker release so it worked out well.

Now, I will add a caveat': I am NOT completely sure that my settings are complete. Because the signals at my location fluctuate so severely at times I tend to get very sporadic communications. But there also could be more to the settings - I am fairly new at the multiple tables systems so I am leaving open the possibility that this system might have more than one table...? I don't have the experience with such systems to properly evaluate how one would sound with incomplete table settings. What I came up with seems to work but, again, with the fades and extremely quick and terse voice transmissions that the users employ it was difficult to be absolutely sure. I hope someone closer to the actual site (Terminal Island if you are correct) with solid signal coverage could use my settings and either verify them or add to/fix them if they are wrong or incomplete. So consider them a starting point with verification necessary before we can stamp them with full approval! But that's what this site is partially for! I added what I could now someone else can better test and verify or add to.

All for now. I am glad I could add something! Just hope someone else can verify both the settings and the location!

-Mike

 

[WayneH]

I am NOT completely sure that my settings are complete. Because the signals at my location fluctuate so severely at times I tend to get very sporadic communications. But there also could be more to the settings - I am fairly new at the multiple tables systems so I am leaving open the possibility that this system might have more than one table...?

I would say based on 410.5250 falling in the first range that the system should only be one range. After that freq there isn't much left as far as leftover channel numbers for other ranges. The smart thing to do would have been to start a second range way before 410.5250.

 

[Mike_G_D]

D01B continued

Wayne,

Thanks! That confirms my understanding of how the multi-table system works (at least it seems to). I just wasn't sure enough to make a fully positive statement about the accuracy of my findings (added to the signal quality issues at y location). I tend to be rather cautious when it comes to technical conclusions.

Still would like to hear from someone close to Terminal Island to verify the setup and/or location!

Thanks again!

Busy monitoring the fires at the Camp Pendleton base and north Oceanside area right now.

-Mike

 

[MtnBiker2005]

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