[USRP-users] Phase Alignment of Multiple X310s

Marcus D. Leech mleech at ripnet.com
Mon Nov 6 17:11:48 EST 2017


On 11/06/2017 04:57 PM, Sarah Tran via USRP-users wrote:
>
> Hi everyone!
>
> I was wondering if anyone knew if it was possible to phase align more 
> than 2 X310s (with UBX daughterboard) to form a coherent array? I know 
> that 2x2 MIMO is possible using a single X310, but I want to be able 
> to sync 4 of them. I thought I read somewhere that it was dependent on 
> the daughterboard, but I can’t find that thread anywhere.
>
> Thanks for all the help!
>
Yes, use an external 10MHz reference and 1PPS source, like the 
Octoclock, or Octoclock-G, or similar.

Also, see this App note:

https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices

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