Tetra decoding

[tsapers]

SO good to see you are still around sq5bpf!
Can confirm I have been using telive successfully on clean install of Debian9 64bit and using the telive auto install and all working fine.
Running on desktop with 4gb RAM and Intel® Core™ i3-2120 CPU @ 3.30GHz × 4
Have just been running 1channel.

Just have these questions:
1) How are you guys using multiple SDR dongles (receivers)?
2) If I use more than one channel (3/4/6/etc) what should I be setting the other frequencies to?

I sometimes get a squeeky garbled sound when running more than one channel. I also get it sometimes when running 1 channel, but suspect that is due to some comms being encrypted although mutessi=1

Here is an idea of what I am getting(attached):

Any ideas?

 

[grosminet]

Front end

Some years ago , I asked the same question .

Recent sdr front end software like CubicSDR or Gqrx has IQ ready output . Gqrx has I/Q and UDP output

all major SDR's are compatible with this front end . It is less CPU consuming than standard GRC gnuradio
supported by telive .

I tried some tests with both software and I didn't succeed .

Some can test based on what is running very well :

Funcube pro + (using QTHID) --> telive

 

[oz1jua]

StrTelive

Added version 0.20 StrTelive. New version can also start Telive with FIFO files. https://github.com/oz1jua/StrTelive

 

[grosminet]

Some years ago , I asked the same question .

Recent sdr front end software like CubicSDR or Gqrx has IQ ready output . Gqrx has I/Q and UDP output

all major SDR's are compatible with this front end . It is less CPU consuming than standard GRC gnuradio
supported by telive .

I tried some tests with both software and I didn't succeed .

Some can test based on what is running very well :

Funcube pro + (using QTHID) --> telive

Well Windows solution arrive with Sdrsharp and TETRA plug In . Nice job . It is the answer of my 3 years old question !!

 

[hsuanwang]

I have tried the plugin of Tetra decoder for SDR# but there are some people have the same problem wioth me. We can't see the decoder show up in SDR# and there's the same crash message when close SDR#. Please refer this:
https://www.rtl-sdr.com/tetra-decoder-plugin-for-sdr-now-available/comment-page-1/#comment-89305

Someone could help us to check that? Thank you...

 

[ale462013]

try this!

I have tried the plugin of Tetra decoder for SDR# but there are some people have the same problem wioth me. We can't see the decoder show up in SDR# and there's the same crash message when close SDR#. Please refer this:
https://www.rtl-sdr.com/tetra-decoder-plugin-for-sdr-now-available/comment-page-1/#comment-89305

Someone could help us to check that? Thank you...

You have to copy both ''SDRSharp.Tetra.dll'' and ''libtetradec.dll'' in your SDR# directory. Set in WFM and 25k bandwidth. Disable filter audio and set the sample rate to 2.4 MSPS max.

Set the right gain and click demodulator

 

[hamradionl]

Work 100% only WIN-10 work as good as in Linux, Not working fully in others WIN
With RTL you need at least -40dBm SSI to get clear audio, lower give to many noise cause to many bit errors and decoder will not work proper.

Thanks for the help C

 

[Ubbe]

With RTL you need at least -40dBm SSI to get clear audio, lower give to many noise cause to many bit errors and decoder will not work proper.

There's no forward error correction so there must be a very clean signal without noise to be able to decode properly.

/Ubbe

 

[Ubbe]

All status messages so far has been 65024.

"65024 - reply when the called device acknowledges receiving a status message"
https://forums.radioreference.com/v...coding-software/302347-tetra-decoding-77.html

/Ubbe

 

[hamradionl]

There's no forward error correction so there must be a very clean signal without noise to be able to decode properly. /Ubbe

Thats what i say

 

[oz1jua]

only 1 channel

If this windows plugin only decodes 1 channel 4 TMDA slots then it is not as good as Telive on Linux.
Telive on linux can decode up to 12-16 channel with a powerful PC.

 

[grahampaull]

If this windows plugin only decodes 1 channel 4 TMDA slots then it is not as good as Telive on Linux.
Telive on linux can decode up to 12-16 channel with a powerful PC.

They are working on it. According their forums they are wanting to bring the whole TELive across to Windows.

The developer is relying on people sending him IQ recordings as far as I know so he is limited as he doesn't have access to any big networks.

Sent from my SM-G950F using Tapatalk

 

[oz1jua]

Plugin for SDRSharp

I have it up and running fine with a AirSpy with both 2.5 and 10 Mhz bandwith. It is bad that it only support 64 Bit Windows.
But that is the same with Telive for Linux 64 Bit.
But i dont think that it give me the same output.
I do not see any different from ISSI and GSSI so I can tell the different.
I had hope that this is some that has been added as explained in documentation.
If it is added how can I se the different. Any Clue ?

 

[hsuanwang]

You have to copy both ''SDRSharp.Tetra.dll'' and ''libtetradec.dll'' in your SDR# directory. Set in WFM and 25k bandwidth. Disable filter audio and set the sample rate to 2.4 MSPS max.

Set the right gain and click demodulator

Of cause we took these files to SDR# folder but the problem still shows. I have tried on Win7-X64/Win8.1. Maybe I have to get a Win10 to check... Thank you for your advice.

 

[Matof35]

Telive Raspberry PI3

Hello to the community!

I explain my problem to you. I would like to transform my Raspberry PI3 into a TETRA receiver.
So I installed a Raspbian 8 Jessie distribution, with a VNC and SSH server. I followed the tutorial provided by sq5bpf to install telive

Everything is going well. I can start "SQ5BPF TETRA 1.9", as well as gnuradio-companion with telive_1ch_slow_udp. I detect many TETRA signals.
On the other hand, when I want to run receiver1udp, I get this message: "./receiver1udp: line 29: 42000+: error syntax: operand expected (error token is" + ")".

I wanted to know if it was possible to turn his Raspberry TETRA receiver. If so, I would like to know if you had already had this error and if you have a solution to my problem.

Thank you in advance for your answers !

 

[oz1jua]

Hello to the community!

I explain my problem to you. I would like to transform my Raspberry PI3 into a TETRA receiver.
So I installed a Raspbian 8 Jessie distribution, with a VNC and SSH server. I followed the tutorial provided by sq5bpf to install telive

Everything is going well. I can start "SQ5BPF TETRA 1.9", as well as gnuradio-companion with telive_1ch_slow_udp. I detect many TETRA signals.
On the other hand, when I want to run receiver1udp, I get this message: "./receiver1udp: line 29: 42000+: error syntax: operand expected (error token is" + ")".

I wanted to know if it was possible to turn his Raspberry TETRA receiver. If so, I would like to know if you had already had this error and if you have a solution to my problem.

Thank you in advance for your answers !

Have you try the same with FIFO files.

 

[Matof35]

What do you mean ?

 

[oz1jua]

What do you mean ?

Have you tried using FIFO files instead of using UDP.
I've seen FIFO run more reliably. And then it can be
that this error you experience with receiver1udp does not come if you instead using FIFO files.
/tmp/fifo1
/tmp/fifo2 etc.

You will of course have to use receiver1 instead of receiver1udp and associated GRC files that
output to /tmp/fifo1.......

That is why I in StrTelive added the option to run Telive with fifo. Becouse i have seen FIFO run better i many cases.
The only draw back I se to use FIFO is that you have to start receiver before you start GNU Radio. (GRC File).

 

[ale462013]

Hi i found this. Anyone can help with DSD+?

https://forums.radioreference.com/a...62992d1519647646-tetra-decoding-dsd-tetra.jpg

sorry for my bad english.

 

[Matof35]

Hello oz1jua,

I followed your tutorial well. I have no more error using receiver1. On the other hand, decoding does not work. Here is the gnu-radio log:

Generation: "/home/pi/tetra/telive/gnuradio-companion/receiver_pipe/top_block.py"

Running: "/home/pi/tetra/telive/gnuradio-companion/receiver_pipe/top_block.py"

linux; GNU C ++ version 4.9.1; Boost_105500; UHD_003.007.003-0-unknown

Using the Volk machine: neon_hardfp_orc
gr-osmosdr 0.1.3 (0.1.3) gnuradio 3.7.5
built-in source types: osmosdr file fcd rtl rtl_tcp uhd miri hackrf bladerf rfspace airspy
Using the device # 0 Generic RTL2832U SN: 77771111153705700
Found Rafael Micro R820T tuner
The exact sampling frequency is: 2000000.052982 Hz
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
>>> Done