kalibrate-rtl
Calculate local oscillator frequency offset using GSM base stations
Platforms: Linux · Last verified September 6, 2026
Kalibrate, or kal, can scan for GSM base stations in a given frequency band and can use those GSM base stations to calculate the local oscillator frequency offset.
Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.
Getting started
Install on Kali Linux with `sudo apt install kalibrate-rtl`. See the official Kali tool page and upstream homepage linked above for full usage and configuration details.