Hi,

I am using an Ettus X310 with a twin RX card. How do I configure this card to 
use an external 10MHz clock? In GNU Radio I have changed the LO source of the 
RFNoC radio block to external, but this results in strange behavior:


If I inject a CW tone into the twin RF and observe the output on a GUI GUI 
Frequency sink I get the expected output when the LO source is internal. When I 
switch to external the tone is no longer visible but I get a small DC offset.


Can anyone explain this? There is a 10dBm 10MHz sinusoid connected to the Ref 
In.


Thanks,


Andy


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