DMR & NXDN in SC

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I thought I would email you and let you know I found another frequency for Dist 5. I was in Clemson this past Friday and did some searching. I found 461.9750 also being used by the busses. Same TG as the one you posted. I heard the name Glenwood School once.

Shajoe44,
Do you have color code or slot information for 461.9750? I checked my inbox and spam folder I never got your email.
 
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Below is a list of DMR channels I discovered recently which can be heard loud and clear from Greenville County.

461.5125
Color Code 12
Slot 1 TG 1

462.4000
Color Code 12
Slot 1 TG 2001
Slot 2 TG 2002 Talking about the ice machine for first shift??

453.4750
Color Code 7
Slot 1 TG 101

464.6125
Color Code 13
Slot 1 TG 113

451.9375
Color Code 11
Slot 1 TG 1
Slot 1 TG 5

The school district of Oconee County uses DMR for school bus communications with both slots in use. This is what I found from their DMR system:

451.6125
Color Code 11
Slot 1 TG 400
Slot 2 TG 500

452.3625
Color Code 10
Slot 1 TG 300
Slot 2 TG 100

The two frequencies above came from the callsign WQCP343. There are other frequencies listed but I haven't been able to catch any activity on them just yet.


I also found new talkgroups for DMR channels I already had in my scanner and those are....

Slot 2 TG 5000 - Simpsonville First Baptist Church
Slot 1 TG 7000 - Laurens Campus GHS Hospital
Slot 1 TG 3000 - North Greenville Campus GHS Hospital
 

apx7000xe

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Found a new Carolina Fleettalk site. Broadcasting as Site 4, CC is 460.025 LCN403. Other site LCNs are 485, 577, 658, and 703. Site neighbors are 6, 9, 10, and 15. I cannot find anyone licensed for NXDN emissions on this frequency in SC, NC, or GA. I have the site at around -95dbm on the base antenna in the Lake Hartwell area (Lavonia). No other site in the DB seems reasonably close enough for this RSSI level and none of the 4 sites list this as a frequency. Any ideas?
 

IcomIcR20

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Found a new Carolina Fleettalk site. Broadcasting as Site 4, CC is 460.025 LCN403. Other site LCNs are 485, 577, 658, and 703. Site neighbors are 6, 9, 10, and 15. I cannot find anyone licensed for NXDN emissions on this frequency in SC, NC, or GA. I have the site at around -95dbm on the base antenna in the Lake Hartwell area (Lavonia). No other site in the DB seems reasonably close enough for this RSSI level and none of the 4 sites list this as a frequency. Any ideas?
That is an interesting catch considering we have identified a Site 4 on all four "sub-systems" that make up the L219 FleetTalk system. Either a new sub-system has been activated, or this Site 4 replaces one of the old Site 4s. I see a new Site 5 was recently added to the DB, and a Site 5 already exists on the current sub-systems, so maybe a new network is indeed coming online.

I cannot find any matching license for that frequency either, but this is also not surprising for this system. There are several FleetTalk sites that I have been inexplicably unable to find any license for. Heaven knows I spent way too much time looking for them when I was invested (perhaps too invested) in mapping out this system a few years ago. I can understand not being able to find licenses for sites using paging frequencies (454.xxx for example), but licenses for a few sites using something like 451.xxx were nowhere to be found, even when I knew exactly which tower it was transmitting from.
 
Last edited:

brian

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Perhaps someone with more detailed knowledge of NXDN trunking can shed light, but I'm less convinced that there are distinct "systems", each with up to 30 sites, that are networked together. Seems more like it's one big system, and that site numbers (RANs) can be reused/duplicated within the system.

I am convinced that our guesses as to sites that are grouped together (1xx, 2xx, 3xx, etc) are very much guess and are not accurate. We are definitely into a 5th "system" as we have some site numbers that are duplicated 5 times.

Maybe someone can explain the technical architecture of NXDN trunked systems and how sites might be grouped together.
 

brian

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I'm pretty sure that in the case of Fleettalk, the Site number and RAN are the same for each site. Perhaps that's no true for every NXDN trunked system.
 

IcomIcR20

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Brian is correct in that the RAN matches the site number for all FleetTalk sites that I have monitored.

I have from a very good source that FleetTalk does (or at least did at one time) indeed have the sites grouped similarly to the way that we have them grouped in the DB. A number of years ago, the networks were officially named "NC SITE," "SC SITE," "VA SITE," and "COSTAL." It should be noted that those were only loose classifications as many of the sites listed under the "VA SITE" network were in North Carolina, for instance. However, I am not knowledgeable enough about NEXEDGE systems to speak to all of the technical intricacies of how the FleetTalk system is implemented.
 

RaleighGuy

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In the trunking world of NXDN, Ran = site number
Since there are only 63 RAN codes available, are you saying there can only be 63 sites? I agree the RAN is or maybe a part of the site number, but not THE site number. If so how can FleetTalk have sites in the hundreds.

Capture0.PNG


Q05:How many RAN (Radio Access Number) codes are available?
A05:Up to 63 RAN codes are available.

RAN (Random Access Number) is similar to a CTCSS encode for analog systems. It unlocks the squelch on the repeater while you transmit to permit access to the repeater. There are 63 codes.
 

Searay

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Since there are only 63 RAN codes available, are you saying there can only be 63 sites? I agree the RAN is or maybe a part of the site number, but not THE site number. If so how can FleetTalk have sites in the hundreds.

View attachment 153578


Q05:How many RAN (Radio Access Number) codes are available?
A05:Up to 63 RAN codes are available.

RAN (Random Access Number) is similar to a CTCSS encode for analog systems. It unlocks the squelch on the repeater while you transmit to permit access to the repeater. There are 63 codes.
An NXDN trunking system can be configured as "Local" or "Regional". "Local" will allow a maximum of 30 sites and "Regional" will allow a maximum of 48 sites. System are linked together via a system bridge to allow roaming across multiple system.
 

IcomIcR20

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Since there are only 63 RAN codes available, are you saying there can only be 63 sites? I agree the RAN is or maybe a part of the site number, but not THE site number. If so how can FleetTalk have sites in the hundreds.

View attachment 153578
Those are not the actual site numbers. The highest site number on the L219 FleetTalk system is 30. However, since there are duplicate site numbers due to the fact that there are way more than 30 sites on the system, they are listed in the DB in this way to differentiate the sites. Both Site 105 and Site 205 would show as Site 5 when using DSD+, for example. As mentioned, FleetTalk is configured as a "local" NEXEDGE system, so there are multiple "sub-systems" with up to 30 sites in each network.

From the DB entry:
Site numbers will be as shown below to indicate which specific system the site belongs to. Note that this format is not exactly consistent with site information as shown by some decoding software packages or radios.

North Carolina North Central and Viginia System: Site 1xx

North Carolina South Central System: Site 2xx

South Carolina Upstate/Midlands/Pee Dee: Site 3xx

South Carolina Lowcountry: Site 4xx
 

RaleighGuy

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Those are not the actual site numbers. The highest site number on the L219 FleetTalk system is 30. However, since there are duplicate site numbers due to the fact that there are way more than 30 sites on the system, they are listed in the DB in this way to differentiate the sites. Both Site 105 and Site 205 would show as Site 5 when using DSD+, for example. As mentioned, FleetTalk is configured as a "local" NEXEDGE system, so there are multiple "sub-systems" with up to 30 sites in each network.

From the DB entry:

Thanks for the explanation, now I have a better understanding of how they are set up, but the intended purpose of the 63 possible RAN codes was as PL/Color code/NAC using them as site numbers just makes it easier.
 

Searay

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Those are not the actual site numbers. The highest site number on the L219 FleetTalk system is 30. However, since there are duplicate site numbers due to the fact that there are way more than 30 sites on the system, they are listed in the DB in this way to differentiate the sites. Both Site 105 and Site 205 would show as Site 5 when using DSD+, for example. As mentioned, FleetTalk is configured as a "local" NEXEDGE system, so there are multiple "sub-systems" with up to 30 sites in each network.

From the DB entry:
Those are not the actual site numbers.

"Correct, they will show as 1-30"

The highest site number on the L219 FleetTalk system is 30. However, since there are duplicate site numbers due to the fact that there are way more than 30 sites on the system, they are listed in the DB in this way to differentiate the sites. Both Site 105 and Site 205 would show as Site 5 when using DSD+, for example. As mentioned, FleetTalk is configured as a "local" NEXEDGE system, so there are multiple "sub-systems" with up to 30 sites in each network.

"Correct as well, some of them are listed in the incorrect system (ie sub system) though"
 

IcomIcR20

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"Correct as well, some of them are listed in the incorrect system (ie sub system) though"
Yes, I am sure some are listed on the wrong system since there is really no sure-fire way to tell which sites go with which sub-systems, especially in South Carolina where they are often mixed together. We tried our best when mapping out this system, but there were a few sites we had to guess about. Throwing yet another sub-system into the mix now just complicates things even further. In North Carolina and Virgina the sub-systems seem to be geographically separated more clearly.
 

apx7000xe

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Big news regarding the new site. The control channel is not licensed but I have found all of the voice channels for the site as well as LCN’s. They are licensed to Pickens County WRZH814 Presumably for their new public safety system. The LCNs for the site are
403- 460.025 CC
408- 460.0875
485- 461.050
577- 462.200
658- 463.2125
703- 463.775
This does not seem to be a normal FleetTalk site. I’m not seeing standard Fleettalk talk groups on this site.
Seen talkgroups are- 3, 320, 582, 11541(ENCRYPTED) OTA Aliases show Medic, 11551(ENCRYPTED) OTA Aliases show medic, 11553, 11554, 11571, 11671, and 13021. I have been parked on the site for several days and these are the only seen groups over the past 24 hours.
 
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