[USRP-users] Phase drift issue of N310

Damon qiu.guowang007 at gmail.com
Thu Mar 14 16:37:57 EDT 2019

Hi Marcus,

The UHD Version is v3.14.0.0-rc1.

Best regards,


>> 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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