[USRP-users] UBX synchronization

Michael West michael.west at ettus.com
Mon Oct 19 11:40:03 EDT 2015


Hi Piotr,

Yes, the UBX phase synchronization has been working since that release.  We
always recommend using the latest release of UHD, which is currently 3.9.1.

Regards,
Michael

On Sat, Oct 17, 2015 at 8:53 AM, Piotr Krysik via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hi all,
>
> The changelog of UD 3.8.3 mentions this:
> * UBX: Fixed phase synchronization issues       (Related changes: Change
> X300
> daughterboard frequency, increase       N210 FIFO depth)
>
>
> Does it mean that phase synchronization of multiple UBX daughter-boards
> is officially supported since that version?
>
> Best Regards,
> Piotr Krysik
>
> W dniu 05.03.2015 o 00:52, Michael West via USRP-users pisze:
> > Hi Brandon,
> >
> > The UBX uses the MAX2871 synthesizer which has a phase resync feature
> > by means of configuring the MUX pin and asserting a rising edge on
> > it.  This is unlike the ADF4351 synthesizer which has the resync
> > feature built-in and automatically resynchronizes the phase after
> > tuning.  Because of that, the phase resync feature for the UBX is
> > actually still in development and we plan to have it available in UHD
> > 3.8.3.  Once available, it will offer the same level of phase
> > synchronization as the SBX board.  That means that the relative phase
> > offset should remain consistent across tunings and power cycles, so
> > phase calibration should become much simpler.
> >
> > Regards,
> > Michael E. West
> >
> > On Wed, Mar 4, 2015 at 12:27 PM, Cochenour, Brandon M CIV NAWCAD,
> > 4.5.6 via USRP-users <usrp-users at lists.ettus.com
> > <mailto:usrp-users at lists.ettus.com>> wrote:
> >
> >     Yes, I assumed they were all sharing the same reference and
> >     coherent, but it was the "alignment" part that maybe suggested a
> >     way to tune/do phase resync/etc..  Maybe I'm reading too much into
> >     it.  http://www.ettus.com/content/files/UBX_Spec_Sheet.pdf
> >
> >
> >     It's always a bit of a pain with the WBX to have the ambiguity
> >     between Tx and Rx...or the unknown phase difference between radios
> >     even if all phase locked to a common reference.  Was hoping that
> >     the UBX was going to eliminate a bunch of extra calibration
> >     procedures...
> >
> >
> >
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> >
> >
> >
> >
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>
>
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