TETRA GPS

[Spartanman]

Hi again guys,

I have the TTT installed on my pc. Im trying to "follow" TETRA devices in the LRRP map, but i dont see nothing. I know this sistem is used in my area at certain point, but i dont find any units or devices. Someone knows something more about this sistem and about how to operate it?

Sorry for my english haha.

Have a good day!

 

[oe5kbo]

Hi again guys,

I have the TTT installed on my pc. Im trying to "follow" TETRA devices in the LRRP map, but i dont see nothing. I know this sistem is used in my area at certain point, but i dont find any units or devices. Someone knows something more about this sistem and about how to operate it?

Sorry for my english haha.

Have a good day!

hallo wenn Sie Erfolg haben mit Ihrer Technik gps auf einer Karte darzustellen, könne Sie mich darüber informieren danke

 

[Ubbe]

Im trying to "follow" TETRA devices in the LRRP map, but i dont see nothing.

First you have to receive the LRRP data. Do you see it in any of the windows? Many times the LRRP data are not sent out to the mobiles, there's no reason for it, and are not repeated out and then you cannot receive it from the system.

If you see the data it can also be coded in a special way that also include other data from the mobile and will then not follow the LRRP standard and it could also be encrypted. Can you do a screen shoot when you receive the LRRP data?

/Ubbe

 

[Spartanman]

First you have to receive the LRRP data. Do you see it in any of the windows? Many times the LRRP data are not sent out to the mobiles, there's no reason for it, and are not repeated out and then you cannot receive it from the system.

If you see the data it can also be coded in a special way that also include other data from the mobile and will then not follow the LRRP standard and it could also be encrypted. Can you do a screen shoot when you receive the LRRP data?

/Ubbe

Simply i don´t understand how ttt works and i dont know if i have installed well. What screenshot do yo need ? ill post it

 

[dave3825]

He is asking for a screen shot of DSDPlus showing that it is seeing gps data.

Something like this that came from another thread.

 

[Spartanman]

He is asking for a screen shot of DSDPlus showing that it is seeing gps data.

Something like this that came from another thread.

View attachment 138159

Oh, ok. To show that i have to open only de dsd plus interface or with the tetra demodulator? I am a litle bit lost on working with this

 

[dave3825]

You first have to know there is gps data for LRRP to process. IF your using the tetra demodulator, then you're using sdr# or sdr++?

 

[Spartanman]

You first have to know there is gps data for LRRP to process. IF your using the tetra demodulator, then you're using sdr# ?

Yes, i use tetra demodulator plugin with sdr. What do i have to open to see if there is gps data?

 

[dave3825]

DSDPlus will show gps data but I do not believe DSDPlus will decode Tetra.

 

[Spartanman]

DSDPlus will show gps data but I do not believe DSDPlus will decode Tetra.

to decode tetra i use the tetra demodulator plugin. But how can i use the DSD to show the gps data?

 

[dave3825]

I do not believe DSDPlus will decode the Tetra

 

[Spartanman]

I do not believe DSDPlus will decode the Tetra

View attachment 138160

Yeah, i dont think that. Im asking how can i see wit DSD if there is any gps data. I mean, how can i open the screen you have shown

 

[dave3825]

I do not think you can because DSDPlus does not decode Tetra. If you use tetra demodulator plugin and send the signal to DSDPlus, it's not going to know how to process or decode the Tetra signal.

Unless someone knows of a way to take the decoded Tetra from the plugin and get it into LRRP.

 

[Spartanman]

 

[Spartanman]

thats what im trying to do

 

[dave3825]

Ok, that makes sense. DSDPlus is not being used. The program in this thread looks to be feeding LRRP

https://www.rtl-sdr.com/forum/viewtopic.php?f=3&t=2452

I would start at the beginning of the thread and read it fully as it has changed over the last few years. I do not have tetra near me to even try it, I also only speak English so the video posted is difficult to understand.

 

[thewraith2008]

If you are not seeing the GPS messages (with LAT/LON) in the Network Info window of TETRA demodulator, then TTT does not have anything to use to pass on to LRRP so it can plot them.

Many times the LRRP data are not sent out to the mobiles, there's no reason for it, and are not repeated out and then you cannot receive it from the system.

As Ubbe has already mentioned, MS GPS messages are not always returned to the BS downlink.

 

[Spartanman]

If you are not seeing the GPS messages (with LAT/LON) in the Network Info window of TETRA demodulator, then TTT does not have anything to use to pass on to LRRP so it can plot them.


As Ubbe has already mentioned, MS GPS messages are not always returned to the BS downlink.

here?