Crazy Danish Hacker – GSM Sniffing 3 – Identifying downlinks
Episode 3: identifying GSM downlink frequencies. Using a spectrum viewer to scan the GSM 900 and 1800 bands and pick out active downlink channels used by nearby cell towers.
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Crazy Danish Hacker – GSM Sniffing 4 – GQRX Installation and usage
Episode 4: installing and using GQRX, an open-source SDR receiver front-end. First hands-on look at the GSM band with an RTL-SDR dongle.
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Crazy Danish Hacker – GSM Sniffing 5 – Kalibrate RTL
Episode 5: using kalibrate-rtl to detect GSM base stations and measure the frequency offset of the RTL-SDR dongle. A calibration step required before serious sniffing work.
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Crazy Danish Hacker – GSM Sniffing 6 – Locating cell towers
Episode 6: locating nearby GSM cell towers by decoding their broadcast identifiers. Combining kalibrate output with public cell tower databases to map the local RF environment.
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Crazy Danish Hacker – GSM Sniffing 7 – Installing GR GSM
Episode 7: installing gr-gsm on Linux. Building the GNU Radio-based GSM decoding toolset from source: dependencies, compilation, first sanity check.
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