You cannot synchronize USRP devices by using a daisy-chain configuration. The 10 MHz reference and the 1 PPS on both USRP devices must be connected to a common 10 MHz reference and to a common 1 PPS signal. The OctoClock-G device can be used to generate these signals and to distribute them to 8 devices. Then, for each USRP device, in UHD or GNU Radio, set your clocking source and timing source to "external".
https://kb.ettus.com/OctoClock_CDA-2990 https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices --Neel Pandeya On Thu, 16 Jul 2020 at 05:00, Snehasish Kar via USRP-users < [email protected]> wrote: > Hello > > I am trying to time synchronize two USRPs. I have connected reference and > PPS trigger out of USRP A to reference and PPS trigger in of USRP B. In > USRP A i have set time and clock source to GPSDO and in USRP B I have set > time and clock source to external. But I when I try to compare > uhd::time_spec for both the boards I see there is a time mismatch. Please > help me understanding where I am going wrong. > > Regards > Snehasish > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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