Columbus DMR...

[INDY72]

Apparently they have put up an MotoTRBO TRS alongside the P25, and it is sharing some of the same freqs on the same lic.... As well as putting in the former conventional stuff from the school system.

We need some serious looking at the set up here.

I need the following info asap: If it is an CON PLUS, or CAP PLUS? All the freqs in use on the DMR side, and proper LCNs... If it is CON PLUS the SysID, and proper Site ID...
Also need a very close Unitrunker or Pro96Com run on the P25 to see if they cut it down to run both systems so they do not interfere with each other, need current data on all freqs on it etc.

 

[JasonTracy]

milf, I submitted what I've heard so far.

I've got a Whister TRX-1 and some SDR dongles, but only one that has a TCXO that is any good with Unitrunker.

If you can point me in the right direction on gathering some of this info, I'm happy to try to get more detail. I'm located only 1 mile from the FCC listed transmission site for this license and can see a strong signal to the control channel in SDR#.

I agree, it is very confusing.

If it helps, I can confirm that I do NOT see a continuous control channel for anything but the legacy P25 system, which still has active jail and juvenile center traffic.

I continue to record DMR traffic and have yet to hear any public safety traffic on the DMR system. Just city services and schools.

 

[INDY72]

I am unsure if the TRX will do it like the X36HP will, where you can monitor a freq conventionally on DMR and it will display DMR for conventional DMR, CON for Connect Plus, CAP for Capacity Plus, and T3 for Tier 3 systems. And monitor every one of the 800 Freqs manually to see if there is an MotoTRBO Control Chan on any of them. And run UT on the system on the P25 and verify the freqs in use, Site NAC etc... If this is an Capacity Plus, there will not be an CC so to speak.. But we will need to know all the freqs in use on it , and then find the LCNs .... And there should be a way for SDR and DSD to tell you what format the DMR is....

 

[del1964]

If you're referring to the Columbus City Services system, I monitored it briefly at lunch time here in Edinburgh and my SDS-100 showed it as a "CAP+" system. The only traffic I picked up was on 855.2125 and it was definitely a conversation about buses. Color Code 8. I ran very briefly LCN finder and got nothing. I'm running it again now but inside a building. I may hook up my airspy and run DSD on SDRSharp to see what I get if anything.

 

[del1964]

Running a "Discovery" session on the system with the SDS100. Display shows MotoTRBO and CAP+

 

[del1964]

Got a bite on SDRSharp with DSD+

Group call; TG=102 Ch=5
Group call; TG=136 Ch=4
...repeated
then,

Group call; TG=16 Ch=2 and my scanner showed this as "ColumBUS Transit Operations"


then,

Group call; TG=142 Ch=1

 

[del1964]

Getting something on 855.1625Mhz DSD+ shows it as "Sync: NXDN96 CB VOICE" and "Sync: +DMR"??? I should leave this to the experts or give me a better idea how I can check what you're looking for while I can use DSD+ and my SDS100 LOL's

 

[del1964]

Ok....the 855.1625 and 855.4375 are CUMMINS frequencies which are nearby my location. Those are Encrypted. I believe 855.8875 is also Cummins but its a different color code

 

[JasonTracy]

I'm 100% sure that the 855.8875 Frequency should NOT be in this "Columbus City Services" system. I agree with del1964 that it is all Cummins and encrypted. It is WQAH391.

All activity I've heard on this "Columbus City Services" DMR system is on 855.21250 and 855.46250 only. 855.21250 is on its own license, WPNQ936.

855.21250 is on WPJJ684, but it is on the same Cap+ DMR system as 855.21250, what we have called "Columbus City Services".

As for the remaining frequencies for WPJJ684:
859.46250 is the control frequency for the city P25 system. (NAC 1F1)
856.26250 voice traffic on city P25 system
856.46250 voice traffic on city P25 system
858.46250 voice traffic on city P25 system

857.46250 No traffic heard
855.73750 No traffic heard

I seem to recall during a public meeting a few years back that there were two channels on the city P25 system that were reserved for exclusive use of public safety, which can use this system as their backup if SAFE-T fails. Perhaps the two that are silent right now are those, but clearly we don't have enough detail to know what they are right now.

Finally, all traffic on "Columbus City Services" I've seen is color code 8.

Anything else I can help with on these?

 

[JasonTracy]

FYI, I just saw that someone added two more talk groups, 2 and 3.

I'm pretty sure these are not correct, as I heard someone refer to the channel they were on as "Ops 2" when using TG 3.

I'm also hearing far more school bus traffic on TG 2 and 3 than school traffic. My guess, right now, is that we have:

1 - Admin (Heard someone say this was the Administration channel that goes to all schools
2 - Ops1
3 - Ops2 (User of channel used this term) Mostly school bus, or school to bus traffic
4 - Trans 1 (User of channel used this term) Mostly school bus, or school to bus traffic
5 - Trans 2 (User of channel used this term) Mostly school bus, or school to bus traffic

It also appears that Schmidtt school as two TGs now, 11 and the previous 13.

Other than 4 and 5, which I already submitted, I'm not 100% on these, so I'd like to hold off adding them to the DB until confirmed.

 

[del1964]

I heard traffic saying this is Rockcreek Elementary to school bus blah blah blah. So, I waited until I heard that and it was ID 3. I'm not super familiar on how this all works but that's why I submitted that. ID 2 I heard Southside elementary to school bus blah blah blah. I also heard traffic on ID 11 and 1 but no confirmation on who / what they were. ????

 

[JasonTracy]

No worries, del1964. I'm new to this as well.

I've been figuring out the radio IDs as well, even though we don't use them on here.
As a general rule, I've found all of the buses are 1000 through 1199.
Schools seem to be in 100's after that, starting with 1300 for the central middle school. I know 1900 is Mt. Healthy.

What it appears to be is that some schools have intra-school channels, like the ones I've submitted already, that are just for person to person within the school.

The Ops1-2 and Trans1-2 are confusing. Last year, I never heard those Ops channels (TG 2 and 3), but this year, I'm hearing both school to bus and bus to bus on them. I'm not sure why they have 4 for the buses now, but I suspect that perhaps they're trying to reduce system-wide traffic and making smaller groups that are designed for each region.

That way, if Southside needs to reach a bus that services Southside, it doesn't have to hail them on Trans 1, which was previously the channel all school buses used as their primary.

Trans 2 (TG 5) was used as a alt channel for the bus drivers to have a longer conversation on without bothering everyone else. They would discuss whatever they needed to, then switch back to Trans 1. So far, that seems to be the same this year.