Multi device synchronization isn’t supported on 2901. Sharing the minimal flow graph that shows your error issue would be useful.
Sent from my iPhone > On Feb 5, 2024, at 9:24 PM, Ramesh, Eshan <e...@gatech.edu> wrote: > > > Hi, > > I'm trying to use a common reference signal to sync two > USRP-2901s. I'm using gnuradio with the default USRP sink and source > blocks, and we're using an external signal generator into the "REF IN" > port. > > If we use the same USRP for the transmitter and receiver (but on > different subdevs (RF channels)), when the reference signal is not > present, we see an error as expected: > > "usrp_sink :warning: Sensor 'ref_locked' failed to lock within timeout on > motherboard 0." > > Turning on the reference signal generator gets rid of this error. > > However, when we try to use two USRPs connected to the same reference > signal, the error does not appear even if the signal is off. Setting > one radio's clock source to be "internal" and the other's "external", > and then modifying the reference signal frequency seems to have no > effect, so I think the radios are not really synced. I would expect > that I'd see a frequency difference if the reference signal frequency was > slightly incorrect in a loopback scenario. > > Is there a reason why the error does not appear when using multiple > USRPs even though there is no reference signal, and the radios remain > seemingly unsynchronized? > > Thanks, > Eshan Ramesh > > > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com
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