[USRP-users] GPSDO on N210 problem

Sam mite mite.engr11 at gmail.com
Wed Apr 24 02:42:10 EDT 2013


> On 04/22/2013 03:25 AM, Sam mite wrote:
> >
> >
> >     On 04/15/2013 12:28 AM, Sam mite wrote:
> >     > Hi,
> >     >
> >     > I am trying to setup GPS on my N210. The problem is that
> >     Detecting internal
> >     > GPSDO returns *"not found"* as shown below. Whereas it also says
> >     that *gpsdo:
> >     > internal.  *What is wrong ? I am on ubnutu Gnuradio 3.6.3rc0. My
> UHD
> >     > version is  UHD_003.005.000-26-gb65a3924
> >     >
> >
> >     The gpsdo internal is just an entry in the device's eeprom to tell it
> >     that it should look for the GPSDO. So, I think you are looking at a
> >     communication issue. Double check that the power and serial cables
> >     appear to be plugged in correctly.
> >
> >     -josh
> >
> >
> > After  checking the cable, and following the post installation
> > instruction for N series, now the GPS has been detected. But now when
> > I run  following command
> >
> > /uhd_usrp_source= uhd.usrp_source(device_addr="addr=192.168.10.2",
> >             stream_args=uhd.stream_args(
> >                 cpu_format="fc32",
> >                 channels=range(1),
> >             ),
> >         )
> > /
> >
> > /print uhd_usrp_source.get_mboard_sensor("gps_time").to_int()/
> >
> >
> >  I am getting the following error
> >
> > return _uhd_swig.uhd_usrp_source_sptr_get_mboard_sensor(self, *args,
> > **kwargs)
> > RuntimeError: LookupError: Path not found in tree:
> > /mboards/0/sensors/gps_time
> >
> > Also sometime I get following:
> >
> > UHD Warning:
> >     get_time: ValueError: get_nmea(): no GPRMC message found
> >
> >
> > what could be wrong ?  Thanks for help
> >
> > --
> >
> > Best Regards,
> >
> > Sam
> Just to eliminate "silly stuff", do you know that your GPS antenna is
> working?  Is it an active antenna?
>
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
>

Hi Marcus,

Yes, GPS antenna is working fine because I get this when I connect same
antenna to other GPSDO kit and USRP.

GPS lock status: locked
GPS_GPRMC: $GPRMC,081949.00,A,3342.8120,N,7301.4976,E,0.0,0.0,220413,,*0C
GPS_GPGGA:
$GPGGA,081949.00,3342.8120,N,7301.4976,E,2,11,0.9,591.0,M,-40.7,M,,*7C

It means, antenna is fine. right?

-- 

Best Regards,

Sam
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