Tetra decoding

[grahampaull]

Yip, exact thing happened to me, I ended up reinstalling everything, there is obviously an easier way to do this but I'm not sure how, I'm not the best at using Linux.


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[welshevo]

i was hoping that wouldnt be needed!!! arghh oh well here goes another install cheers dude

 

[grahampaull]

Just give it an hour to see if anyone replies with home help..


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[welshevo]

ah good thinking ! yep ill hold off for now and see what happens here....

 

[HvB]

No signal?

Hi all,

I trying to decode some signals that I am pretty sure are Tetra signals, I also get a nice signal in the FFT window, but nothing is happening in the receiver 1 terminal, neither in the Xterm window.

I have tried several possible Tetra frequencies, but nothing will produce any output or sounds.

/tetra/bin/tplay < testfile.acelp does play, so I guess the decoding works.

So, my question is, any idea what might be going wrong? I have a lot of experience with Linux and all source-code compiled nicely, so I have no clue....

Attached is a screenshot I made of one of the signals I try to decode in GnuRadio.

Thanks, HeinzVoerbakje

 

[sq5bpf]

I trying to decode some signals that I am pretty sure are Tetra signals,

this is not tetra. the signal is too narrow (it should have double the bandwidth). please use telive_1ch_simple.grc and see if there are any wider signals nearby, especially on lower frequencies (390-392MHz)

i'd try running DSD on it, and see if it decodes

btw are you sure the ppm is set correctly? i've never seen such a low value on R820T sticks

 

[sq5bpf]

a new version of osmo-tetra-sq5bpf is out, please upgrade

this one implements a proprietary Simple Location System message type 0x80 (used in Spain and maybe other countries, i don't know what company is behind it), and has some fixes.

as usual if you see anything interesting in telive.log, especially Location messages which are not decoded, then please send it to me, and include your approximate lattitude/longtitude.

 

[passie101]

Everything is working fine in TMO but on wene i tune to a DMO frequency.
I only get burst errors.
Is DMO also supported ?

 

[FR3500]

I guess you are in Europe;
on this band it can only be TETRAPOL
The bandwith seems to be matching (10 / 12.5 )
no decoder available, and highly encrypted

 

[sq5bpf]

Is DMO also supported ?

only TMO

 

[passie101]

and is DMO support on the "todo" list ?

 

[nekjah]

what is happening?

hello forumers,
Can some one explain to me what is happening to this thing?
There is no sound. Please give me some advise what to do.


Thanks

 

[sq5bpf]

and is DMO support on the "todo" list ?

it's not

 

[sq5bpf]

new toy for the weekend

a new version of telive is out. please update telive (and make sure osmo-tetra-sq5bpf is up to date)

the new version supports the exporting of location information to a kml file. the kml file can be opened with Google Earth etc.

short description:

- read the documentation
- run ./rxx
- see if any location information is present in telive.log
- if so, then /tetra/log/tetra1.kml should appear
- open /tetra/log/tetra1.kml in google earth and see if it works

- if everything works close tetra1.kml , and open example_google_earth.kml - this will refresh tetra1.kml every 5 seconds. this will provide an almost realtime of station locations on a map.

if you don't get any location information, then either none is transmitted, or it is not supported yet.
so far i've implemented LIP Short location report and Simple Location system coding scheme 0x80, which is a proprietary coding scheme used in Spain (vendor unknown). if you want more protocols, then send me samples from telive.log (along with an approximate location).

it is possible to serve tetra1.kml to remote machines via a web server. just modify example_google_earth.kml to reference the tetra1.kml via http. this might be especially useful for people running telive in a VM, because running google earth on the native operating systems will cause less load.

 

[sq5bpf]

Can some one explain to me what is happening to this thing?
There is no sound. Please give me some advise what to do.

wait for someone to start talking


you can also send us telive.log is you want (but disable alldump)


does sound work? can you play testfile.acelp ?

 

[fdnybuff18]

Any chance we would ever see a Windows based program to decode Tetra?

 

[sq5bpf]

Any chance we would ever see a Windows based program to decode Tetra?

sure. go to WAVECOM, the reference in data decoding and you can see w-code

also the documentation https://github.com/sq5bpf/telive/raw/master/telive_doc.pdf might help (around page 10)

 

[nekjah]

wait for someone to start talking


you can also send us telive.log is you want (but disable alldump)


does sound work? can you play testfile.acelp ?

how to get the telive.log?
No sound at all and how to play testfile.acelp?
btw, i have ho experience about ubuntu..please guide me something.
currently im using dvb dongle, already blacklist that thing.
is there any diff between fun dongle and dvb?

thx

 

[sq5bpf]

a new version of telive is out. this one should work around a crash, that happens more often with kml writing enabled and lots ot tetra traffic

 

[toffee]

I have some trouble finding answers to this fault. Is it because i use the rtlsdr in a usb 3 port? By the way, I don't have a usb 2 port on my computer so I tried using a usb 2.0 hub to check if that helped. Yes, I am a linux noob but trying my best to learn.

Using Volk machine: avx_32_mmx_orc
gr-osmosdr v0.0.2-76-gc7cb045f (0.0.3git) gnuradio 3.6.5.1
built-in source types: file fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy
Using device #0 Realtek RTL2838UHIDIR SN: 00000001
Found Rafael Micro R820T tuner
Exact sample rate is: 2000000,052982 Hz
[R82XX] PLL not locked!
[R82XX] PLL not locked!
>>> gr_fir_ccf: using SSE

(python2.7:2766): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
>>> Done


In the terminal that I enter "./receiver1 1" I get this:

~/osmo-tetra-sq5bpf/src $ ./receiver1 1
>>> gr_fir_ccf: using SSE
thread[thread-per-block[0]: <gr_block file_source (1)>]: [/home/henrik/gnuradio/gnuradio-core/src/lib/io/gr_file_source.cc] fseek failed