Re: Question about phase synchronization with X310 and two UBX 40

[Paul Boven]

Hi,

There are UHD commands for sycnrhonizing your USRP to the octoclock, and 
then resetting the CORDIC on each at the same time, which should allow 
you to keep the same phase between them.

Please see: https://files.ettus.com/manual/page_sync.html

Regards, Paul Boven.

On 03/12/2019 08:14, Masatetsu Wake wrote:
> Hello all,
>
> My customer is using X310 with two UBX 40 daugther boards and would like 
> to know how he can synchronize the phase.
>
> Below is the some of the steps he is trying:
>
> 1.
> I add "dboard_clock_rate=20e6" to the "device arguments" field of
> the property for the UHD Source block, as the following URL
> shows.
> <<https://kb.ettus.com/UBX 
> <https://urldefense.com/v3/__https:/kb.ettus.com/UBX__;!!FbZ0ZwI3Qg!-iZCEFpd1GU9lieXJ1xUlTGGU5pT1_gVKZxwV5kBn_Bvh4NhUZaZoAVt9Oc4ZBXz$>>>
> 2.
> Octoclock is connected to all of the four receivers (X310),
> and "clock_source" and "time_source" are "external" in the
> UHD Source block.
> 3.
> Each channel adds phase bias (value is random) everytime the program starts.
>
> He would like the phase bias to be constant.
>
> My customer can not share his code since he needs approvl to send 
> program outside of the company.
>
> It is possible to share sample code (e.g. grc file) for phase 
> synchronization.
>
> Thank you,
>
> Masatetsu Wake
>
> Account Manager
>
> National Instruments Japan
>
> M +81.80.5174.9003
>
> address@hidden