This is correct as far as I know. Although I don’t have an N320 in my lab, it 
uses an up conversion scheme for lower frequencies. That scheme does not 
participate in the LO sharing. 

Sent from my iPhone

> On Jul 18, 2019, at 11:17 AM, Sammy Welschen via USRP-users 
> <[email protected]> wrote:
> 
> I have to acquire phase coherent data on multiple channels using USRP 
> N310/320 devices.
> 
> Am I correct in assuming that for frequencies below 450 MHz, there is no way 
> to remove random phase differences between channels due to the additional 
> frequency shift involved (shown for example in the block diagram  
> http://www.ettus.com/wp-content/uploads/2019/03/N320BlockDiagram.png)? As I 
> understand it, by using the same LO signal for all channels I could remove 
> the differences for frequencies above 450 MHz, but this is of no use for 
> frequencies below 450 MHz due to this the additional stage.
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