![]() The central frequency of the signal can be changed by moving fc slider. The window of the program contains amplitude spectrum of the signal drawn in real-time. It can be started by running from a terminal: This program uses cheap RTL-SDR receivers as a source of the signal. After installation of gr-gsm there are three python executables that will be installed: It is improved replacement of the old Airprobe - the program that lets you receive and decode GSM control messages from timeslot 0 on the broadcasting channel of a BTS. At this moment there is one application that is ready out of the box. There are many possible applications of gr-gsm. The whole process should look something like Figure Don’t forget to add ‘gain’ value again, move back to the frequency field and start pressing the UP/DOWN arrows on your keyboard to start scrolling the frequencies in 200Khz steps until you start seeing some data in your console window. airprobe_rtlsdr.py or load the airprobe_c file using gnuradio-companion and set one of the channel frequencies you just found in the frequency field. Once you know the GSM channels frequencies, you can start gr-gsm by running the python script.
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