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  #1 (permalink)  
Old 01-30-2014, 7:36 PM
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Default New Federal TRS in NOVA 0000A-00A

After looking at Dave's blog post about a new Fed TRS active in the NoVa area; I programmed it into my PSR-500 and ran Pro96Com on it from my location.

Sys ID - 00A
WACN - 0000A
Tower - 101

Main CC - 170.46250
Alt CC - 171.17500
Alt CC - 172.35000
Alt CC - 173.51250

Blog post URL - DC Scanning: New VHF Federal Trunked System

Dave,

I am thinking that I get a little bit better of reception here in Dumfries than you do in Fredericksburg.
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Old 01-30-2014, 8:01 PM
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Seems I'm just barely able to receive it in Loudoun. For a while it showed a signal but no sysid. Now it is and I saw TG 10, encrypted.
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Old 01-31-2014, 3:01 PM
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I have been monitoring this system off and on for about 10 days, All the comms I have seen have always been encrypted. I have had no luck so far identifying who uses this system. Below is just some of the recent activity today.
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Old 02-03-2014, 8:28 AM
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Not picking it up here in Fairfax City using a roof antenna that's not too high in the air (approx 50'). I don't think it's originating in Fairfax County which is where it's being listed as in the database.
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Old 02-03-2014, 9:33 AM
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Yes, I'm not sure that it originates in Fairfax County either. I believe I got a fairly strong signal on the control channel when I was driving up 95 near Potomac Mills. So maybe it's coming from Prince William, or even Charles County, MD across the river.

Dave
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Old 02-03-2014, 8:45 PM
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FYI
Tried to run Unitrunker on 170.4625 but had no signal at all in Silver Spring with omni-directional in attic.
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Old 02-05-2014, 5:51 PM
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Default New Federal TRS in NOVA 0000A-00A

I see the system ID as 01F not 00A on my PSR-600. This (170.4625) P25 control channel is at the USCG comm facility tower on Telegraph Rd. (Same tower also has a separate functioning IWINS P25 trunk system.) I did not get a WACN but will use a different setup to take another look.
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Old 02-06-2014, 10:52 AM
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That's very interesting information dlwtrunked. Looking at the packets on that control channel I see the following


02/05 11:24:46 Multi-Block Network Status Broadcast 1 - SysID: 00A Follow: 1


02/05 11:24:46 Multi-Block Network Status Broadcast 2 - WACN: 0000A Control tx: 0-0677(170.46250) Control rx: 0-0077(162.96250) Cap: Data,Voice,Registration

I looked through all my logs and never saw 01f it was always 00A.
Some other packets that looked interesting

02/05 11:24:46 TDMA Sync Broadcast - *Invalid* 2000/00/00 00:01 (6108)

This looks to me like the date and time of the system has yet to be configured, which seems odd for the amount of money they probably spent on it unless this is just in the testing phase and not in full production mode.

02/05 11:24:46 Phase 2 TDMA Identifier Update - ID: 08 Base: 162.00000 Spacing: 0.01250 Bandwidth: 0.01250 TX Offset: -0.00000 Slots: 2

The above seems to be an indicator that this is a P25 phase II TDMA system. Can anyone with more experience looking at P25 phase II TDMA packets confirm what this indicates please?
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Old 02-06-2014, 3:36 PM
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Quote:
Originally Posted by Linuxcave View Post
02/05 11:24:46 Phase 2 TDMA Identifier Update - ID: 08 Base: 162.00000 Spacing: 0.01250 Bandwidth: 0.01250 TX Offset: -0.00000 Slots: 2

The above seems to be an indicator that this is a P25 phase II TDMA system. Can anyone with more experience looking at P25 phase II TDMA packets confirm what this indicates please?
This is comparable to both the Fairfax Co and Loudoun Co systems. And only Loudoun is actually Phase II.



Loudoun

TDMA Sync Broadcast - 2011/04/09 03:36 (3410l) -8
RFSS Status Broadcast - SysID: 373 Status: Connected Zone: 1 Site: 1 Control: 0-2865(868.91250) Cap: Data,Voice,Registration
Identifier Update - ID: 01 Base: 762.00625 Spacing: 0.00625 Bandwidth: 0.00625 TX Offset: 30.00000
Alternate Control Broadcast - Channel 1: 0-2825(868.66250) Cap: Backup control channel only Channel 2: 0-2843(868.77500) Cap: Backup control channel only
Data Channel Update - Status: C0 Channels: RX: 0-2571(867.07500)
Unknown Op=09 Mfg 90(Motorola) Binary Value: 00001100 10000000
TDMA (Motorola) Identifier Update - ID: 02 Base: 851.01250 Spacing: 0.01250 Bandwidth: 0.01250 TX Offset: -45.00000 Slots: 2



Fairfax

TDMA Sync Broadcast - 2011/04/09 03:23 (2400l) -8
Network Status Broadcast - WACN: BEE00 Control: 0-0841(856.26250) Cap: Data,Voice,Registration

RFSS Status Broadcast - SysID: 3C9 Status: Connected Zone: 1 Site: 2 Control: 0-0841(856.26250) Cap: Data,Voice,Registration

TDMA (Motorola) Identifier Update - ID: 02 Base: 851.01250 Spacing: 0.01250 Bandwidth: 0.01250 TX Offset: -45.00000 Slots: 2
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Old 02-06-2014, 3:55 PM
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Thank you for the information freqhopping!
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Old 02-11-2014, 7:07 AM
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Default RE: New Federal TRS in NOVA 0000A-00A

I rechecked, I mistook the NAC for the system ID while driving. Here is what I have:
P25 standard
Location: Telegraph Rd., Alexandria, VA
Local registration Area: 01
WACN: 0000A
Sys ID: 00A
NAC: 01F
Frequencies:
170.4625 (162.9625) current control
171.1750 (163.3500)
172.3500 (184.8250)
173.5125 (166.1500)

Last edited by dlwtrunked; 02-11-2014 at 7:08 AM.. Reason: typo
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Old 02-13-2014, 5:49 AM
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Missed another type ( poor lighting so missed it when read it). Should be
That should be:
P25 standard
Location: Telegraph Rd., Alexandria, VA
Local registration Area: 01
WACN: 0000A
Sys ID: 00A
NAC: 01F
Frequencies:
170.4625 (162.9625) current control
171.1750 (163.3500)
172.3500 (164.8250)
173.5125 (166.1500)
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