[USRP-users] Phase drift issue of N310

Marcus D. Leech patchvonbraun at gmail.com
Thu Mar 14 09:52:39 EDT 2019


On 03/14/2019 03:56 AM, Piotr Krysik via USRP-users wrote:
> Hi Ali,
>
> The daughterboards have their own clock generators, but they are not
> exactly 'independent'. At least they don't have to be, as they share the
> same reference clock. Look at the block diagram:
>
> https://kb.ettus.com/images/9/9d/USRP_N310_N300_DB_Schematic.pdf
>
> and "Ref Clock" block. I don't have N310 and I know that reality can be
> a bit far from expectations (i.e. look at my "What makes sense and what
> doesn't in the way carrier frequency is set for TwinRX currently?" post).
>
> But maybe the daughterboards can be configured to use that reference clock.
>
>
> Best Regards,
> Piotr Krysik
>
>
The LMK clock generator uses the reference clock from the mainboard, so 
there should not be any mutual phase-jitter/drift issues.  I can test this
   on my N310 in the coming day or two.

What version of UHD is in use?





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