Help finding band plan, MilCom UHF P25

[drsouth]

Has the control channel changed at all on this system?

MIke

no sir, still the same. cc 407.9625
What makes this system hard to scan is the erroneous data that the system outputs. i.e. 851.00625 which is meaningless to this system.

Just like you said in the beginning mike, I just used two scanners (one digital to listen to the voice channels, and one discriminator "tap" for the unitrunker program. As the talkgroups keyed, I could correlate the voice channels to the LCN's, where I made out the list above. It's only changed once that I can see. I posted the first LCN list just before I moved, and was unable to monitor it for a few weeks. They've shifted the LCN's down one slot, changed the talk groups around some, and seem to be running smoothly now.

I've not listened in too much lately, been unpacking, but I have been able to better ID some of the groups:

1 Maverick (AGE)
2 Golf (unknown, maybe transit or crew ops)
3 Blue (Specialists)
4 Gold (Crew Chiefs)
6 ?
10 ?
12 Security Forces
16 Fire Rescue
25 ?
26 ?
27 ?
38 ?
45 ?

 

[mikey60]

Ok, using your listing I'll take a stab at programming for the Pro-96/2096. If you look at the tower file, you'll notice that the identifier tables listed are assumed tables (i.e. the control channel isn't transmitting any tables.) These assumed tables are used for instances like what happened with the Detroit system during the SuperBowl when the tables were not being transmitted.

With the following data:
0:407.962500 6.250
1:407.762500 6.250
2:407.562500 6.250
3:407.362500 6.250
4:407.162500 6.250
5:406.962500 6.250
6:406.762500 6.250
7:406.562500 6.250
8:406.362500 6.250
9:406.162500 6.250

For the Pro-96/2096, this system will require two banks to monitor (there are 10 identifier tables used, and these radios only support 6 per bank).

Bank 1:
CH Lo Ch Hi Offset Base Spacing
0 4095 0 407.9625 Anything, Not Used
4096 8191 4096 407.7625 "
8192 12287 8192 407.562500
12288 16383 12288 407.362500
16384 20479 16384 407.162500
20480 24575 20480 406.962500

Bank 2
CH Lo Ch Hi Offset Base Spacing
24576 28671 24576 406.762500 Anything
28672 32767 28672 406.562500
32768 36863 32768 406.362500
36864 40959 36864 406.162500

Note: In this scheme, the spacing data is not used. You may enter any standard value you like in that field. Make sure you program in the control channel frequency in each bank. You could program in all of the frequencies if you want to be able to pick up any control channel changes. Unlike standard EDACS, the order frequencies are entered doesn't matter since the radio is using the tables above to get the actual frequencies.

Mike

 

[drsouth]

Thanks for helping bridge the gap Mike, I didn't know how to present the data to be useful for the pro-96/2096 users.

David

 

[Smith29180]

Ok I have just found the problem that is causeing me to go gray .First programing problem Didnt have CC on 0 and two had Ctss/dcs search on.Thanks for the patience and help to all
Ron

 

[SCPD]

Hey all, brining this back from the dead..... I see you are saying this is a MA/COM EDACS system, but I heard through the grapevine its an EF Johnson TRS. I am going to try to load up my PRO-96 to check it out.

 

[SCPD]

I think you're right. EFJ P25 uses an channel numbering scheme similar to EDACS which limits them to 1 channels. MA/COM's P25 offering doesn't do this.

 

[drsouth]

I'm not sure what the system is, but I can say that all the handhelds used on the system are Motorola XTS2500I's UHF R1. All of the flghtline supers have model iii's, most of the SF's have model ii's and iii's. and the rest have model i.5's (no pushbuttons on the face, but have a large LCD.

They are using the same two towers they used for their original UHF simplex and VHF (flightline) simplex. They just added more panel antennas.

Dave

 

[SCPD]

I think you're right. EFJ P25 uses an channel numbering scheme similar to EDACS which limits them to 1 channels. MA/COM's P25 offering doesn't do this.

Ouch. Typo ... that should read "limits them to 16 channels." It's possible for someone to configure a Motorola system to behave this way. I suspect the controller and related infrastructure is EFJ.

 

[BigredX]

I'm not sure what the system is, but I can say that all the handhelds used on the system are Motorola XTS2500I's UHF R1. All of the flghtline supers have model iii's, most of the SF's have model ii's and iii's. and the rest have model i.5's (no pushbuttons on the face, but have a large LCD.

They are using the same two towers they used for their original UHF simplex and VHF (flightline) simplex. They just added more panel antennas.

Dave

Actually the system is in fact an EF Johnson P25 system. Most of the subscribers are XTS 5000' with some XTL 5000 mobiles and EFJ 5300 control stations. And they broadcast off of one new tower on base.