What are the output parameters of your Rb reference? Signal amplitude and shape, etc.
Sent from my iPhone > On Sep 1, 2020, at 11:18 AM, Christopher Flood via USRP-users > <[email protected]> wrote: > > > Hi all, > > Sorry if this is coming through twice - I sent it once before I subscribed to > the list, but didn't know if it went through or not! (I didn't see it in the > archives...) > > ------- > > I'm having some trouble using an external reference with the Ettus N310. The > reference I am using is a FS725 Rubidium Frequency Standard. > > To test the difference between the internal clock and the external reference, > I transmitted a 10MHz signal from the Ettus N310 with and without the > external reference. Using just the internal clock of the SDR, the 10MHz > signal slowly wanders with respect to the 10MHz signal from the Rubidium > Frequency Standard as seen on an oscilloscope. This is to be expected since > the stability of the internal clock in the SDR is worse than the Rubidium > Frequency Standard. > > However, when I connect the 10MHz signal from the Rubidium to the external > reference of the N310 and tell the N310 to use the external reference, the > 10MHz signal that the N310 generates wanders much faster with respect to the > 10MHz signal from the Rubidium. This is opposite of what I believe should > happen, assuming the N310 is truly using the external reference signal. > > Have any of you experienced this or have any tips as to what might be going > on? > > Thanks! > > -Chris > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com _______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
