abnormal calibration with kalibrate-bladerf
Posted: Sat Jun 02, 2018 4:26 am
Hi all,
Do my bladeRF broken?
Why run kalibrate-bladeRF, here's the ouput:
./kal -c 94 -w -g 100 -F 52M
Actual filter bandwidth = 1500 kHz
rxvga1 = 27 dB
rxvga2 = 30 dB
kal: Calculating clock frequency offset.
Using GSM-900 channel 94 (953.8MHz)
================
DAC: 0x8000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.317kHz [-67330, -67206] (124, 30.143723)
overruns: 0
not found: 1164
================
DAC: 0x4000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67314] (17, 2.940094)
overruns: 0
not found: 0
================
DAC: 0x2000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67318] (12, 2.511768)
overruns: 0
not found: 0
================
DAC: 0x1000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.326kHz [-67330, -67318] (12, 2.892969)
overruns: 0
not found: 0
================
DAC: 0x0800
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.328kHz [-67330, -67322] (8, 2.389806)
overruns: 0
not found: 0
================
DAC: 0x0400
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.318kHz [-67330, -67194] (136, 26.687473)
overruns: 0
not found: 0
================
DAC: 0x0200
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.325kHz [-67330, -67276] (54, 7.178903)
overruns: 0
not found: 0
================
DAC: 0x0100
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.316kHz [-67334, -67231] (103, 25.575899)
overruns: 0
not found: 0
================
DAC: 0x0080
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.326kHz [-67330, -67301] (29, 4.006910)
overruns: 0
not found: 0
================
DAC: 0x0040
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.325kHz [-67330, -67260] (70, 10.612233)
overruns: 0
not found: 0
================
DAC: 0x0020
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67310] (21, 3.355923)
overruns: 0
not found: 0
================
DAC: 0x0010
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.324kHz [-67330, -67231] (99, 16.735897)
overruns: 0
not found: 0
================
DAC: 0x0008
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67322] (8, 2.496314)
overruns: 0
not found: 0
================
DAC: 0x0004
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.321kHz [-67330, -67239] (91, 20.828142)
overruns: 0
not found: 12
================
DAC: 0x0002
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.314kHz [-67330, -67202] (128, 31.364693)
overruns: 0
not found: 0
================
DAC: 0x0001
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.297kHz [-67330, -67194] (136, 46.877815)
overruns: 0
not found: 22
================
DAC: 0x0001
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.297kHz [-67330, -67186] (145, 47.290295)
overruns: 0
not found: 16
================
DAC: 0x0001
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.305kHz [-67330, -67186] (145, 41.804253)
overruns: 0
not found: 3
Found lowest offset of -67296.937500Hz at 953.800000MHz (-70.556655 ppm) using DAC trim 0x1
Saving contents to bladeRF flash
Q: Why the fequency offset so large, -70ppm is really a bigger value.
Do my bladeRF broken?
Why run kalibrate-bladeRF, here's the ouput:
./kal -c 94 -w -g 100 -F 52M
Actual filter bandwidth = 1500 kHz
rxvga1 = 27 dB
rxvga2 = 30 dB
kal: Calculating clock frequency offset.
Using GSM-900 channel 94 (953.8MHz)
================
DAC: 0x8000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.317kHz [-67330, -67206] (124, 30.143723)
overruns: 0
not found: 1164
================
DAC: 0x4000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67314] (17, 2.940094)
overruns: 0
not found: 0
================
DAC: 0x2000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67318] (12, 2.511768)
overruns: 0
not found: 0
================
DAC: 0x1000
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.326kHz [-67330, -67318] (12, 2.892969)
overruns: 0
not found: 0
================
DAC: 0x0800
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.328kHz [-67330, -67322] (8, 2.389806)
overruns: 0
not found: 0
================
DAC: 0x0400
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.318kHz [-67330, -67194] (136, 26.687473)
overruns: 0
not found: 0
================
DAC: 0x0200
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.325kHz [-67330, -67276] (54, 7.178903)
overruns: 0
not found: 0
================
DAC: 0x0100
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.316kHz [-67334, -67231] (103, 25.575899)
overruns: 0
not found: 0
================
DAC: 0x0080
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.326kHz [-67330, -67301] (29, 4.006910)
overruns: 0
not found: 0
================
DAC: 0x0040
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.325kHz [-67330, -67260] (70, 10.612233)
overruns: 0
not found: 0
================
DAC: 0x0020
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67310] (21, 3.355923)
overruns: 0
not found: 0
================
DAC: 0x0010
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.324kHz [-67330, -67231] (99, 16.735897)
overruns: 0
not found: 0
================
DAC: 0x0008
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.327kHz [-67330, -67322] (8, 2.496314)
overruns: 0
not found: 0
================
DAC: 0x0004
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.321kHz [-67330, -67239] (91, 20.828142)
overruns: 0
not found: 12
================
DAC: 0x0002
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.314kHz [-67330, -67202] (128, 31.364693)
overruns: 0
not found: 0
================
DAC: 0x0001
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.297kHz [-67330, -67194] (136, 46.877815)
overruns: 0
not found: 22
================
DAC: 0x0001
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.297kHz [-67330, -67186] (145, 47.290295)
overruns: 0
not found: 16
================
DAC: 0x0001
....................
....................
....................
....................
....................
average [min, max] (range, stddev)
- 67.305kHz [-67330, -67186] (145, 41.804253)
overruns: 0
not found: 3
Found lowest offset of -67296.937500Hz at 953.800000MHz (-70.556655 ppm) using DAC trim 0x1
Saving contents to bladeRF flash
Q: Why the fequency offset so large, -70ppm is really a bigger value.