On 14.05.2014 12:12, Robert Light wrote:
I try to get B200 to work with OpenBTS and I see some frequency offset in the
internal reference clock.
Does anyone know if the numbers I get from kalibrate, could cause phones not to
be able to register to OpenBTS?
What is the quickest and the cheapest way fix a problem with a clock? I
think B200 has TCVCXO, so is there a way to write some tuning voltage offset to
correct the frequency? Do a clock calibration? Does anyone know the exact
part nr of TCVCXO
mounted in B200?
UHD Warning:
The hardware does not support the requested RX sample rate:
Target sample rate: 0.270833 MSps
Actual sample rate: 0.271186 MSps
Robert,
as long as you see this warning, you'll get offsets. I don't know where
or how kal sets up the master clock, but you should put in a
master_clock_rate=13e6 somewhere in there.
M
kal: Scanning for GSM-900 base stations.
chan: 19 (938.8MHz + 1.915kHz) power: 2812.45
chan: 26 (940.2MHz + 1.900kHz) power: 14595.33
chan: 33 (941.6MHz + 1.913kHz) power: 18358.13
chan: 58 (946.6MHz + 1.930kHz) power: 9563.79
chan: 114 (957.8MHz + 1.957kHz) power: 1872.65
Using GSM-900 channel 19 (938.8MHz)
average [min, max] (range, stddev)
+ 1.896kHz [1855, 1943] (88, 19.746572)
overruns: 0
not found: 92
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