Hi Andrey Sviyazov.
The following commands are executed on the normal board
./kal -s GSM900 -v -R A:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 19506.878626
chan: 11 (937.2MHz - 13.389kHz) power: 53673.23
chan: 14 (937.8MHz + 4Hz) power: 64031.10
chan: 16 (938.2MHz + 30Hz) power: 37823.70
chan: 43 (943.6MHz + 2Hz) power: 77249.29
chan: 50 (945.0MHz - 24Hz) power: 29420.52
./kal -s GSM900 -v -R B:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 28406.616263
chan: 11 (937.2MHz - 6.120kHz) power: 53776.77
chan: 14 (937.8MHz - 59Hz) power: 76683.83
chan: 16 (938.2MHz + 28.945kHz) power: 46724.84
chan: 43 (943.6MHz + 38.130kHz) power: 65350.20
chan: 50 (945.0MHz - 21Hz) power: 29930.09
The following commands are executed on another board seeming to be abnormal
./kal -s GSM900 -v -R A:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 4486.504362
chan: 5 (936.0MHz - 15Hz) power: 6734.70
chan: 12 (937.4MHz + 50Hz) power: 9339.20
chan: 83 (951.6MHz - 13Hz) power: 6462.91
./kal -s GSM900 -v -R B:0
kal: Scanning for GSM-900 base stations.
channel detect threshold: 27671.315417
chan: 5 (936.0MHz + 24Hz) power: 29673.93
chan: 12 (937.4MHz + 40Hz) power: 69096.60
chan: 83 (951.6MHz - 4Hz) power: 46394.73
./kal -c 1004 -R A:0
kal: Calculating clock frequency offset.
Using E-GSM-900 channel 1004 (931.0MHz)
average [min, max] (range, stddev)
+ 2Hz [-80, 79] (159, 44.543312)
overruns: 0
not found: 34
./kal -c 1004 -R B:0
kal: Calculating clock frequency offset.
Using E-GSM-900 channel 1004 (931.0MHz)
average [min, max] (range, stddev)
+ 1Hz [-13, 19] (32, 8.658517)
overruns: 0
not found: 0
Best Regards.