tetra April 2015

tetra@lists.osmocom.org

5 participants
4 discussions

Mixed C and Python Code
by martin 26 Aug '15

26 Aug '15

Hello, i want to ask why there is a mix of python and c code with lots of pipes in between. It is a design decision? Or was it some kind of easyer? Greetings Martin

2 1

4/24/2015 11:42:35 AM
by Graham Palmer 24 Apr '15

24 Apr '15

http://www.kino-popcorn.ru/bfn/kglavwzzgzlifsyxongtwoohxv.qclxkinuniflrgzvw… 4/24/2015 11:42:35 AM

1 0

Patch for GNUradio 3.7
by Timothée COCAULT 05 Apr '15

05 Apr '15

Hi, The scripts in src/demod/python/ don't work with GNUradio 3.7. Mike Jameson wrote a patch for UHD and I completed with a patch for osmo-sdr receivers : https://github.com/m0mik/osmo-tetra/commit/5429a1e3abf3e5c1aeadc0253169233f… https://github.com/Tim---/osmo-tetra/commit/374e651264dc2cbe02366b9affc2f5e… Unfortunately I don't have the hardware to test the other scripts but the modifications should be similar. Regards. Timothée.

1 0

tetra-demod.py chain pipe error
by Espectro Digital 03 Apr '15

03 Apr '15

Hello, I'm trying to receive tetra signal from rtl_sdr by tetra-demod.py, but I got this error: rtl_sdr -s 195312 -f 392.1M -|demod/python/tetra-demod.py -s 195312 -i /dev/stdin -o /dev/stdout|./float_to_bits /dev/stdin /dev/stdout|./tetra-rx /dev/stdin Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 000000xx Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner >>> gr_fir_ccc: using SSE sample rate: 195312 >>> gr_fir_ccf: using SSE Invalid sample rate: 195312 Hz WARNING: Failed to set sample rate. Tuned to 392100000 Hz. Tuner gain set to automatic. Reading samples in async mode... Signal caught, exiting! Signal caught, exiting! Short write, samples lost, exiting! EOF User cancel, exiting... FAQ: Q: Why don't you use osmosdr-tetra_demod_fft.py instead tetra-demod.py? A: osmosdr-tetra_demod_fft.py is a nightmare for tuning, I've never got to center a signal successfully, so I want to modify rtl_sdr for tunning with mouse wheel. Q: Why don't you modify osmosdr-tetra_demod_fft.py? A: Well, I have a large experience programming c, not idea of programming python. Q: Why don't you learn python? A: That's the last bullet in my belt, but i wanna try something faster :) Now a question for you all. Why is not there a C version of tetra demodulator? Thanks and regards.

2 4

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

tetra April 2015