kalibrate-rtl Package Description
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.
Source: https://github.com/steve-m/kalibrate-rtl
kalibrate-rtl Homepage | Kali kalibrate-rtl Repo
- Author: Joshua Lackey, Steve Markgraf
- License: Other
Tools included in the kalibrate-rtl package
kal – Calculate local oscillator frequency offset using GSM base stations
[email protected]:~# kal -h
kalibrate v0.4.1-rtl, Copyright (c) 2010, Joshua Lackey
modified for use with rtl-sdr devices, Copyright (c) 2012, Steve Markgraf
Usage:
GSM Base Station Scan:
kal <-s band indicator> [options]
Clock Offset Calculation:
kal <-f frequency | -c channel> [options]
Where options are:
-s band to scan (GSM850, GSM-R, GSM900, EGSM, DCS, PCS)
-f frequency of nearby GSM base station
-c channel of nearby GSM base station
-b band indicator (GSM850, GSM-R, GSM900, EGSM, DCS, PCS)
-g gain in dB
-d rtl-sdr device index
-e initial frequency error in ppm
-v verbose
-D enable debug messages
-h help
kal Usage Example
Scan for GSM base stations in the GSM-850 band (-s GSM850), then use channel 128 (-c 128) to get the frequency offset:
[email protected]:~# kal -s GSM850
Found 1 device(s):
0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Scanning for GSM-850 base stations.
GSM-850:
chan: 128 (869.2MHz - 3.988kHz) power: 486634.32
chan: 143 (872.2MHz - 3.760kHz) power: 56331.63
[email protected]:~# kal -c 128
Found 1 device(s):
0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Calculating clock frequency offset.
Using GSM-850 channel 128 (869.2MHz)
average [min, max] (range, stddev)
- 4.093kHz [-4102, -4083] (20, 5.314593)
overruns: 0
not found: 0
average absolute error: 4.709 ppm