[USRP-users] Internal reference signal USRP X-series

Martin Braun martin.braun at ettus.com
Fri Feb 22 18:17:09 EST 2019


You can feed the OctoClock from the X310, and then use the OctoClock's
output to drive the N210. All devices will be synchronized, in frequency,
and the N210s will be synchronized in time, but the X310 and N210s will not
be synchronized in time. However, that timing offset you might able to
calibrate out, I wouldn't expect it to drift.

-- M

On Tue, Feb 19, 2019 at 5:11 AM Maria Jesus Cañavate Sanchez via USRP-users
<usrp-users at lists.ettus.com> wrote:

> Hi Marcus,
>
> Thank you very much for your answer!
>
> I need to synchronise the following devices:
>
> - 4 USRPs N-200
>
> - 1 USRP X-310
>
> So I thought of using the internal reference and PPS signal from the
> X-310 as the input of the Octoclock (not the G) to be able to
> synchronise everything for a MIMO set-up and other purposes.
>
> Do you think it is a good approach?
>
> Best regards,
>
> Maria Jesus
>
> On 19/02/2019 12:32, Marcus D. Leech via USRP-users wrote:
> > On 02/19/2019 06:08 AM, Maria Jesus Cañavate Sanchez via USRP-users
> > wrote:
> >> Hi there!
> >>
> >> I wanted to ask if the USRP X-310 includes an oscillator to create an
> >> internal 10MHz reference and 1 PPS signal, even if they are not that
> >> accurate, or if the only way to provide these internal signals is by
> >> adding the "Board Mounted GPSDO (OCXO)".
> > Yes, the X-310 includes internal oscillators that are actually good
> > enough for a lot of applications.
> >
> >>
> >> Another thing I wanted to ask is if the Octoclock-G includes a GPS
> >> antenna in the same kit or if that must be bought separately to be
> >> able to lock it to the GPS signal.
> >>
> >> Thank you very much in advance!
> > I don't think it includes a GPS antenna, but it is compatible with
> > most active GPS antennae out there.  There are dozens and dozens from
> > which
> >   to choose in the market, readily available on Amazon and the like.
> >
> >
> >>
> >> Best regards,
> >>
> >> Maria Jesus
> >>
> >>
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> >
> >
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