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Nowlan, Sean

Tue, Nov 29, 2011 11:34 PM

Hi all,

For some reason I can't get an N200 to lock to the 10 MHz reference clock from the installed GPSDO module. Calling "get_mboard_sensor("gps_locked", 0)" returns a message indicating that GPS is locked, but "get_mboard_sensor("ref_locked", 0)" indicates "unlocked." I ran a program for 2 hours in which I called both sensors every 10 seconds in the presence of a good GPS signal. I also verified that the jumper was set correctly when the GPSDO module was installed. Any other ideas?

Thanks,
Sean

Hi all, For some reason I can't get an N200 to lock to the 10 MHz reference clock from the installed GPSDO module. Calling "get_mboard_sensor("gps_locked", 0)" returns a message indicating that GPS is locked, but "get_mboard_sensor("ref_locked", 0)" indicates "unlocked." I ran a program for 2 hours in which I called both sensors every 10 seconds in the presence of a good GPS signal. I also verified that the jumper was set correctly when the GPSDO module was installed. Any other ideas? Thanks, Sean

JB

Josh Blum

Wed, Nov 30, 2011 2:39 AM

On 11/29/2011 06:34 PM, Nowlan, Sean wrote:

Hi all,

For some reason I can't get an N200 to lock to the 10 MHz reference
clock from the installed GPSDO module. Calling
"get_mboard_sensor("gps_locked", 0)" returns a message indicating
that GPS is locked, but "get_mboard_sensor("ref_locked", 0)"
indicates "unlocked." I ran a program for 2 hours in which I called
both sensors every 10 seconds in the presence of a good GPS signal. I
also verified that the jumper was set correctly when the GPSDO module
was installed. Any other ideas?

If this is latest master, the readback for ref lock was disconnected in
the fpga for accidental/timing reasons. I should have it back soon.

-josh

On 11/29/2011 06:34 PM, Nowlan, Sean wrote: > Hi all, > > For some reason I can't get an N200 to lock to the 10 MHz reference > clock from the installed GPSDO module. Calling > "get_mboard_sensor("gps_locked", 0)" returns a message indicating > that GPS is locked, but "get_mboard_sensor("ref_locked", 0)" > indicates "unlocked." I ran a program for 2 hours in which I called > both sensors every 10 seconds in the presence of a good GPS signal. I > also verified that the jumper was set correctly when the GPSDO module > was installed. Any other ideas? > If this is latest master, the readback for ref lock was disconnected in the fpga for accidental/timing reasons. I should have it back soon. -josh

HK

Haris KREMO

Wed, Nov 30, 2011 4:57 AM

Did you move jumper J510? I have N210s and since I moved the jumper I
see "E" LED on all the time. To be honest I did not check the sensor state.

http://www.ettus.com/downloads/gpsdo-kit.pdf

Hope it helps,

H.

On 11/30/2011 8:34 AM, Nowlan, Sean wrote:

Hi all,

For some reason I can't get an N200 to lock to the 10 MHz reference
clock from the installed GPSDO module. Calling
"get_mboard_sensor("gps_locked", 0)" returns a message indicating that
GPS is locked, but "get_mboard_sensor("ref_locked", 0)" indicates
"unlocked." I ran a program for 2 hours in which I called both sensors
every 10 seconds in the presence of a good GPS signal. I also verified
that the jumper was set correctly when the GPSDO module was installed.
Any other ideas?

Thanks,

Sean

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Did you move jumper J510? I have N210s and since I moved the jumper I see "E" LED on all the time. To be honest I did not check the sensor state. http://www.ettus.com/downloads/gpsdo-kit.pdf Hope it helps, H. On 11/30/2011 8:34 AM, Nowlan, Sean wrote: > > Hi all, > > For some reason I can't get an N200 to lock to the 10 MHz reference > clock from the installed GPSDO module. Calling > "get_mboard_sensor("gps_locked", 0)" returns a message indicating that > GPS is locked, but "get_mboard_sensor("ref_locked", 0)" indicates > "unlocked." I ran a program for 2 hours in which I called both sensors > every 10 seconds in the presence of a good GPS signal. I also verified > that the jumper was set correctly when the GPSDO module was installed. > Any other ideas? > > Thanks, > > Sean > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

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GPSDO 10 MHz reference clock won't lock