[USRP-users] GPSDO Support
john.malsbury at ettus.com
Mon Jun 4 11:57:42 EDT 2012
If you follow the instructions here, and burn the EEPROM, the USRP will
be configured to select the GPSDO 10 MHz and 1 PPS by default. As
indicated in the installation instructions provided with the GPSDO, you
will have to move a jumper that will connect the GPSDO 10 MHz, and
disconnect the external 10 MHz reference. You should not need to do
anything with the .hdl code.
Have I properly understood your questions?
On 6/3/2012 2:39 PM, Simon HB9DRV wrote:
> Hi Marcus,
> Thanks -- it's the internal GPSDO I'll be using. The oscillator phase
> noise is very good.
> Simon Brown, HB9DRV
> http://dit-dit-dit.com <http://dit-dit-dit.com/>
> You are standing at the end of a road before a small brick building.
> Around you is a forest.
> A small stream flows out of the building and down a gully. The sunspot
> count is 285.
> *From:*Marcus D. Leech [mailto:mleech at ripnet.com]
> *Sent:* 03 June 2012 18:37
> *To:* Simon HB9DRV
> *Cc:* usrp-users at lists.ettus.com
> *Subject:* Re: [USRP-users] GPSDO Support
> Via UHD.dll or flipping switches? It looks like I'll be buying one
> anyway, the phase noise spec is very good.
> Searching the UHD.dl source code I see this which indicates that
> it's used automagically:
> "By default, if a GPSDO is detected at startup, the USRP will be
> configured to use it as a frequency and time reference. The
> internal VITA timestamp will be initialized to the GPS time, and
> the internal oscillator will be phase-locked to the 10MHz GPSDO
> reference. If the GPSDO is not locked to satellites, the VITA time
> will not be initialized."
> That is only, as far as I know, for the "in skin" internal GPSDO.
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> USRP-users mailing list
> USRP-users at lists.ettus.com
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