1996 mkdir kalibrate
1997 cd kalibrate/
1998 git clone https://github.com/steve-m/kalibrate-rtl
2000 cd kalibrate-rtl/
2002 less README
2003 ./bootstrap
2004 ./configure
2005 make
2007 cd src/
2009 ./kal
2010 ./kal -s GSM900
Found 1 device(s):
0: Generic RTL2832U (e.g. hama nano)
Using device 0: Generic RTL2832U (e.g. hama nano)
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Scanning for GSM-900 base stations.
GSM-900:
chan: 72 (949.4MHz + 18.936kHz) power: 172769.47
chan: 83 (951.6MHz - 15.994kHz) power: 180280.54
2011 ./kal -c 72 #### Note that not using -e here leads to inaccurate results.
Found 1 device(s): #### See the next example for proper usage.
0: Generic RTL2832U (e.g. hama nano)
Using device 0: Generic RTL2832U (e.g. hama nano)
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Calculating clock frequency offset.
Using GSM-900 channel 72 (949.4MHz)
average [min, max] (range, stddev)
+ 17.588kHz [16590, 18719] (2129, 424.765808)
overruns: 0
not found: 113
average absolute error: -18.526 ppm
2018 ./kal -e -52 -c 83 -v ### Here the initial error is set to -52 ppm a value suggested based off
Found 1 device(s): ### LTE Cell Scanner and keenerd rtl_test results. But apparently just
0: Generic RTL2832U (e.g. hama nano) ### guessing works too. You have to get the FCCH-peak in the 270k
### bandwidth for GSM reception. If the initial error is too large
Using device 0: Generic RTL2832U (e.g. hama nano) ### and uncorrected the peak might be outside the range.
Found Rafael Micro R820T tuner
Exact sample rate is: 270833.002142 Hz
kal: Calculating clock frequency offset.
Using GSM-900 channel 83 (951.6MHz)
offset 1: -16280.91
offset 2: -14628.91
offset 3: -16121.81
offset 4: -16232.36
offset 5: -15499.85
offset 6: -16057.75
offset 7: -16061.89
offset 8: -15724.05
offset 9: -16140.40
offset 10: -15567.01
offset 11: -16990.69
offset 12: -16427.62
offset 13: -17941.18
offset 14: -16587.76
offset 15: -16605.32
offset 16: -16128.01
offset 17: -18540.40
offset 18: -17188.02
offset 19: -15987.50
offset 20: -12743.42
offset 21: -16160.04
offset 22: -16162.10
offset 23: -14313.80
offset 24: -15438.90
offset 25: -15846.99
offset 26: -16747.90
offset 27: -19116.90
offset 28: -15687.89
offset 29: -15466.79
offset 30: -14348.93
offset 31: -15944.11
offset 32: -16106.31
offset 33: -14329.30
offset 34: -17024.78
offset 35: -16357.36
offset 36: -16275.75
offset 37: -22596.53
offset 38: -16132.14
offset 39: -16088.75
offset 40: -16256.12
offset 41: -16133.17
offset 42: -13698.05
offset 43: -11377.60
offset 44: -16126.97
offset 45: -16429.69
offset 46: -15881.09
offset 47: -17529.99
offset 48: -15668.26
offset 49: -16101.15
offset 50: -16133.17
offset 51: -15836.66
offset 52: -16864.64
offset 53: -16022.63
offset 54: -16133.17
offset 55: -15995.76
offset 56: -16186.90
offset 57: -16287.11
offset 58: -17677.73
offset 59: -16191.03
offset 60: -12085.31
offset 61: -16153.84
offset 62: -15828.40
offset 63: -16177.60
offset 64: -15584.57
offset 65: -14298.31
offset 66: -17359.52
offset 67: -16865.67
offset 68: -14212.56
offset 69: -17597.14
offset 70: -14665.07
offset 71: -15873.85
offset 72: -16114.58
offset 73: -16281.95
offset 74: -13565.81
offset 75: -14272.48
offset 76: -14738.43
offset 77: -16058.79
offset 78: -16776.82
offset 79: -15500.89
offset 80: -16062.92
offset 81: -16422.46
offset 82: -16136.27
offset 83: -16644.58
offset 84: -16059.82
offset 85: -16287.11
offset 86: -16036.06
offset 87: -16154.87
offset 88: -14685.74
offset 89: -16711.74
offset 90: -17473.17
offset 91: -16364.60
offset 92: -15458.53
offset 93: -15965.80
offset 94: -16846.04
offset 95: -19664.47
offset 96: -15726.11
offset 97: -16290.21
offset 98: -16140.40
offset 99: -16511.31
offset 100: -15690.99
average [min, max] (range, stddev)
- 16.064kHz [-17188, -14349] (2839, 527.594788)
overruns: 0
not found: 622
average absolute error: -35.119 ppm