> 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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
