Hello Andy, The LO source is for an external or internal RF source and is fed directly to the mixers. You are looking for the set_clock_source call which will allow you to set the USRP to use an external 10 MHz reference.
Regards, Derek On Thu, Jan 25, 2018 at 7:53 PM, Andrew Thommesen via USRP-users < usrp-users@lists.ettus.com> wrote: > 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 > > > Sent from Outlook <http://aka.ms/weboutlook> > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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