Re: [Openbts-discuss] Running OpenBTS with GPSDO as external reference on USRP B210

[Simon P. <sim...@st...>]

Hi, it still seems like the problems are due to bad timing, please take a
 look at these graphs that I created from the physical measurements on the
channel. Pay special attention to the timing error graph, this one shows
that the timing error is constantly between -1.1 and -1.5 bit periods.

I should mention that the GPSDO seem to work fine when I run: sudo
 ./query_gpsdo_sensors, and the GPS-lock led is illuminated.

Do you guys think that the problem still is due to a bad clock? or do you
think it has to do with failed real time priorities?

2016-03-11 10:42 GMT+01:00 Simon Pålstam <sim...@st...>:

> Thank you so much for your help. The GPSDO seems to work fine, so the
> problem probably has to do with something else.
>
> 2016-03-10 12:20 GMT+01:00 Pierre Baudry <agm...@ag...>:
>
>> Hi,
>>
>> You can query the GPSDO running
>> /usr/local/lib/uhd/utils/query_gpsdo_sensors binary (if you built UHD
>> from source).
>>
>> The GPSDO will be automatically used (check for "-- Detecting internal
>> GPSDO.... Found an internal GPSDO" line in uhd_usrp_probe output)
>>
>> 2016-03-10 11:19 GMT+01:00 Simon Pålstam <sim...@st...>:
>> > Hi, I am trying to set up OpenBTS on a B210 and has run into problems
>> with
>> > cellphones that do not connect. I have think that the problem probably
>> has
>> > to do with a bad clock. To solve this problem I have now installed a
>> GPSDO
>> > on the B210 to use as external reference.
>> >
>> > Is there any configurations that I need to do in UHD or OpenBTS for the
>> > system to use the GPSDO? Or will it use GPSDO automatically after it is
>> > installed?
>> >
>> > I would also like to know if there is a way to confirm if the GPSDO is
>> > currently in use and if it is locked to GPS a satellite?
>> >
>> > Thanks for any help!
>> >
>> > /Simon
>> >
>> >
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>
>