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ptrkrysik / gr-gsm

Gnuradio blocks and tools for receiving GSM transmissions
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gsgsm_scanner with R820T，nothing display #508

Open jasonblackj opened 4 years ago

jasonblackj commented 4 years ago

Hi, I use the grgsm_scanner with R820T，but no station display and grgsm_livemon works. I also try to use different samp_rate but it doesn't work. please help me.

My OS：kali 2.0(physical machine) Library ：libosmocore+gr-osmosdr(installed)

Here's the output: root@xxx:/home/gr-gsm/apps# grgsm_scanner -b GSM900 -g 20 --samp-rate=0.8e6 -v -d

Args= [INFO] [UHD] linux; GNU C++ version 8.2.0; Boost_106700; UHD_3.13.1.0-3

RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

[WARNING] SoapySSDPEndpoint failed join group udp://239.255.255.250:1900 setsockopt(IP_ADD_MEMBERSHIP) [19: No such device]

setsockopt(IPV6_ADD_MEMBERSHIP) [19: No such device] Found Rafael Micro R820T tuner gr-osmosdr 0.1.4 (0.1.4) gnuradio 3.7.13.4 built-in source types: file osmosdr fcd rtl rtl_tcp uhd miri hackrf bladerf rfspace airspy airspyhf soapy redpitaya freesrp Using device #0 Realtek RTL2838UHIDIR SN: 00000001 Found Rafael Micro R820T tuner [R82XX] PLL not locked! Invalid sample rate: 800000 Hz Allocating 15 zero-copy buffers Args=

velichkov commented 4 years ago

Hi @jasonblackj,

I use the grgsm_scanner with R820T，but no station display and grgsm_livemon works.

Are you sure that there are GSM C0 Cells in the GSM900 band in the area where you are scanning? Do you have a suitable antenna attached to your RTL dongle? In case you are inside of a big building try moving near a window or outside where the signal is stronger.

I also try to use different samp_rate but it doesn't work. please help me.

My OS：kali 2.0(physical machine) Library ：libosmocore+gr-osmosdr(installed)

How did you install gnuradio and gr-gsm and which versions?

Here's the output: root@xxx:/home/gr-gsm/apps# grgsm_scanner -b GSM900 -g 20 --samp-rate=0.8e6 -v -d

Args= [INFO] [UHD] linux; GNU C++ version 8.2.0; Boost_106700; UHD_3.13.1.0-3

RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

[WARNING] SoapySSDPEndpoint failed join group udp://239.255.255.250:1900 setsockopt(IP_ADD_MEMBERSHIP) [19: No such device]

setsockopt(IPV6_ADD_MEMBERSHIP) [19: No such device]

To suppress the above errors you can run grgsm_scanner with --args=rtl parameter.