SDS100/SDS200: Strange DMR repeater

[dazza0768]

Hi
In New Zealand I have found a couple of repeaters in my area that transmit DMR.
This is a strange setup as its only 1 frequency with a DMR TIER 3 format.
It has 1 frequency and when its not in use it has no data flow, its just dead.
When a user keys up the repeater it activates a TGID 9999 and the same frequency is then activated for chatting as if its a dmrt1 or dmrt2.
My full understanding is DMRT3 is for trunking but this frequency is not for trunking.
There are no control channels whatsoever for this repeater site, just a few analog and a couple of one frequency DMR channels and this weird one frequency DMR TIER 3 channel.

Has anyone seen this before?
The repeater details are 'TAIT TB7300 SLIMLINE DMR BASE STATION/REPEATER'. This has only 1 frequency programmed being 164.1625 and is formatted as DMRT3 but acts as a standard DMR TIER 2.

Yes I have searched for the control channel that doesn't exist.

This seems like a custom setup that a radio company has created for their customer.

I have trialed it in my USDS100 as Mototrbo and OFT with no luck as mototrbo want a full setup with a CC and VC and LCNs, OFT wants DMR only without the T3.
The only way I can use these freqs is by programming it as conventional.

 

[Ubbe]

Do you have DSDplus, preferable fastlane, as that are probable more up to date with new system types? It would show what's really going on.
Maybe it is some variation of T3 and you have to program it as such but you do not have the correct LCN number to be able to trunk track it. That could then also be the problem with OFT, that there's a LCN being transmitted that the OFT type cannot handle and the process stops.

TAIT's specs for that basestation says it can be used in all modes, conventional with one data+voice or 2x voice, T2 or T3. I wonder how the users radios would work if there was no continious control channel to lock on to in T3 mode. Better check with DSDplus what really are transmitted.

/Ubbe

 

[dazza0768]

Do you have DSDplus, preferable fastlane, as that are probable more up to date with new system types? It would show what's really going on.
Maybe it is some variation of T3 and you have to program it as such but you do not have the correct LCN number to be able to trunk track it. That could then also be the problem with OFT, that there's a LCN being transmitted that the OFT type cannot handle and the process stops.

TAIT's specs for that basestation says it can be used in all modes, conventional with one data+voice or 2x voice, T2 or T3. I wonder how the users radios would work if there was no continious control channel to lock on to in T3 mode. Better check with DSDplus what really are transmitted.

/Ubbe

I shall wipe the dust of my RTL-SDR lol

I have the correct LCN as NZ have them all listen in the band plan which is handy.

Somehow it uses a T3 format but acts like T2.
Very weird huh.
Will Lee what happens and will let you know.

 

[Ubbe]

Very weird huh.

I guess that T3 needs a controller that have all the TG's and such in a database, back in a control room type of thing. If that base are programmed as T3 and users as T2 I could imagine it could work like this in standby mode when it has no connection to a controller. When no connection to central office server it drops its control channel, to let users find another sites control channel, but if a user transmits on the frequency it starts its CC.

/Ubbe