git clone git://github.com/steve-m/kalibrate-rtl.git
cd kalibrate-rtl/
autoreconf -i
./configure
make -j2

sudo src/kal -s GSM900
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-900 base stations.
GSM-900:
        chan: 2 (935.4MHz + 34.969kHz)  power: 294945.00
        chan: 6 (936.2MHz + 35.137kHz)  power: 104544.58
        chan: 13 (937.6MHz + 893Hz)     power: 182453.84
        chan: 17 (938.4MHz + 1.901kHz)  power: 117400.49
        chan: 28 (940.6MHz + 34.969kHz) power: 219765.67
        chan: 33 (941.6MHz + 34.670kHz) power: 2027765.69
        chan: 36 (942.2MHz + 1.184kHz)  power: 578831.96
        chan: 44 (943.8MHz + 1.445kHz)  power: 2326516.45
        chan: 61 (947.2MHz + 33.797kHz) power: 62292.75
        chan: 72 (949.4MHz + 514Hz)     power: 112023.62
        chan: 85 (952.0MHz + 32.806kHz) power: 124627.05
        chan: 87 (952.4MHz + 33.751kHz) power: 445110.68
        chan: 98 (954.6MHz + 521Hz)     power: 493710.58
GSM-R-900:
        chan: 955 (921.2MHz + 36.073kHz)        power: 20033.53
        chan: 966 (923.4MHz + 2.709kHz) power: 24996.40
        chan: 972 (924.6MHz + 36.073kHz)        power: 49972.48
        chan: 973 (924.8MHz + 35.737kHz)        power: 42008.19
E-GSM-900:
        chan: 2 (935.4MHz + 35.200kHz)  power: 144475.43
        chan: 6 (936.2MHz + 35.274kHz)  power: 103695.17
        chan: 13 (937.6MHz + 1.039kHz)  power: 168682.63
        chan: 17 (938.4MHz + 2.056kHz)  power: 112587.91
        chan: 25 (940.0MHz + 34.629kHz) power: 139882.86
        chan: 28 (940.6MHz + 35.086kHz) power: 226052.93
        chan: 33 (941.6MHz + 34.820kHz) power: 2041621.02
        chan: 36 (942.2MHz + 1.366kHz)  power: 542051.93
        chan: 41 (943.2MHz - 17.789kHz) power: 519220.51
        chan: 44 (943.8MHz + 1.584kHz)  power: 2308363.96
        chan: 87 (952.4MHz + 33.873kHz) power: 325653.63
        chan: 96 (954.2MHz + 528Hz)     power: 978882.74
        chan: 98 (954.6MHz + 637Hz)     power: 450019.09
        chan: 976 (925.4MHz + 36.225kHz)        power: 83873.12
        chan: 979 (926.0MHz + 35.870kHz)        power: 1098823.57
        chan: 981 (926.4MHz + 35.932kHz)        power: 346551.86
        chan: 990 (928.2MHz + 2.644kHz) power: 1310491.78
        chan: 992 (928.6MHz + 1.809kHz) power: 355883.55
        chan: 1002 (930.6MHz + 35.297kHz)       power: 578027.08
        chan: 1010 (932.2MHz + 34.659kHz)       power: 782513.78
        chan: 1013 (932.8MHz + 2.052kHz)        power: 632884.25
        chan: 1021 (934.4MHz + 2.293kHz)        power: 832750.33