there is now a test sample (bit file) with speech at
Please only add samples to this page if you have the full
agreement for publishing from all involved parties (e.g.
operator of the network, people speaking during the capture).
This is not the place to share captures which were made
from someone else without their knowledge.
Dieter Spaar, Germany spaar(a)mirider.augusta.de
i found your brilliant project yesterday and asked me, if it is possible to
use a signal from a radioscanner discriminator output for your omso-tetra
In your Picture
it seems to me, that I only need PCM Samples from my radioscanner.
Thus I think i can stream the discriminator output via soundcard
(PCM-Samples) into a linux pipe and use this pipe for your omso-tetra tool.
Is this possible?
Or is my radioscanner not possible to "stream" the correct channel pattern?
Hi thank you for your comment.
What do you think about the following thought:
I take two old radioscanners each has 12.5 kHz channel pattern
("Kanalraster") , Tetra uses 25 kHz.
Then I make for each scanner a FM modulation in Software or on FPGA and
after a signal addition. Now i should have the modulated Pi/4-DQPSK signal
back. Or haven’t I?
I can't understand why tetra-rx won't work with my configuration :
AR5000 -->output 10.7 Mhz -->DJX11 in IQ mode then sound card
I have a nice graph as same as using DJX11 but no decode
This previous configuration is working with standard windows SDR software
Attached is a patch that fixes some global ugliness. The dependencies
are a bit iffy, so you need a make clean after applying this.
This fix needs to be in place before you decode multiple carriers. I
would like to suggest that tetra-rx.c be changed so that it can receive
multiplexed streams of input. Byte values of 0 / 1 will be the primary
stream, but other values can be used to encode the multiplexed streams.
The easiest method is to use the high order bits of the input as a
"stream id", and dynamically create new state structs as they appear in
Does this sound like a decent solution ?