[USRP-users] GPSDO on N210 problem

Marcus D. Leech mleech at ripnet.com
Mon Apr 22 12:15:43 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

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