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[Discuss-gnuradio] B200 clock calibration


From: Robert Light
Subject: [Discuss-gnuradio] B200 clock calibration
Date: Wed, 14 May 2014 12:12:34 +0200

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

 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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