# Re: B200 clock calibration **URL:** \ **Category:** GNU Radio\ **Created:** [May 14, 2014, 7:13pm UTC](https://www.ruby-forum.com/t/re-b200-clock-calibration/241143 "2014-05-14T19:13:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [May 14, 2014, 7:13pm UTC](https://www.ruby-forum.com/t/re-b200-clock-calibration/241143/1 "2014-05-14T19:13:37Z")
> 2 kHz offset is within tolerance for 1900 MHz. Locking to a stable 10 > MHz reference, generally an OCXO or GPSDO, is the recommended > approach. I applied external 10MHz reference, the best I had at hand. Now kalibrate says I have about 200Hz offset at 900MHz and 420Hz at 1800MHz, but phones still do not want to register to OpenBTS. A few phones that did not see the network before, are now seeing the network. They see the network, but they say “no access” when I try to register. I configured OpenBTS to allow everything to register with no restrictions. The same computer was working with B100 a few weeks ago without any problems. I now have a few B200 but none of them works. They all behave the same way. Is there a point in going for a more accurate clock ? I am already below 500Hz at 1900MHz. Did anyone get OpenBTS working on B200 ? In the log I see regular “Sample buffer: Overrun”. Can I do anything about it? There is no sign in OpenBTS log that a phone is trying to register. May 14 13:33:29 lenovo-Edge transceiver: ERR 139674597304064 13:33:29.0 UHDDevice.cpp:780:readSamples: Sample buffer: Overrun May 14 13:33:30 lenovo-Edge transceiver: ERR 139674597304064 13:33:30.9 UHDDevice.cpp:780:readSamples: Sample buffer: Overrun May 14 13:34:29 lenovo-Edge transceiver: ERR 139674597304064 13:34:29.0 UHDDevice.cpp:780:readSamples: Sample buffer: Overrun May 14 13:35:29 lenovo-Edge transceiver: ERR 139674597304064 13:35:29.0 UHDDevice.cpp:780:readSamples: Sample buffer: Overrun May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 UHDDevice.cpp:737:readSamples: Requested timestamp = 792.358 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251049728 14:42:40.0 Transceiver.cpp:774:driveTransmitFIFO: radio clock 5:1319506 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 Transceiver.cpp:358:pullRadioVector: looking for TSC at time: 1:1319505 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 Transceiver.cpp:358:pullRadioVector: looking for TSC at time: 2:1319505 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 Transceiver.cpp:358:pullRadioVector: looking for TSC at time: 3:1319505 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 UHDDevice.cpp:737:readSamples: Requested timestamp = 792.36 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251049728 14:42:40.0 Transceiver.cpp:774:driveTransmitFIFO: radio clock 7:1319506 May 14 14:42:40 transceiver: last message repeated 2 times May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 UHDDevice.cpp:772:readSamples: Received timestamp = 792.357 May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 Transceiver.cpp:358:pullRadioVector: looking for TSC at time: 4:1319505 ---
**Author:** ![rlorimor](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/96bed5/32.png) [@rlorimor](https://www.ruby-forum.com/u/rlorimor)\ **Post date:** [May 14, 2014, 11:11pm UTC](https://www.ruby-forum.com/t/re-b200-clock-calibration/241143/2 "2014-05-14T23:11:26Z")
On 05/14/2014 01:12 PM, Robert L. wrote: > May 14 14:42:40 lenovo-Edge transceiver: DEBUG 140528251016960 14:42:40.0 > Transceiver.cpp:358:pullRadioVector: looking for TSC at time: 3:1319505 At this point, this is very-likely a question for the OpenBTS forums, not here. – Marcus L. Principal Investigator Shirleys Bay Radio Astronomy Consortium > **[Live Draw HK Tercepat | Result HK | HK Pools | Live HK | HK Prize Hari Ini](https://www.sbrac.org)** > > Temukan live draw hk tercepat melalui halaman hk pools yang resmi dan dapatkan result hk prize melalui live hk secara langsung di situs kami.