W dniu 21.09.2017 o 19:16, Piotr Krysik via USRP-users pisze: > W dniu 21.09.2017 o 17:19, mle...@ripnet.com pisze: >> You talk about board-mounted GPSDOs in each of your B210s, but then >> talk about using an Octoclock-G. >> >> In the Octoclock-G example, you are explicitly selecting "external" >> for your refclock and time source? >> >> It is fully-expected that no two GPSDOs will precisely agree on >> frequency and phase, and will have some amount of mutual phase-noise. >> Even when fed with the same antenna. >> > I explicitly written that I configured USRPs to take PPS and 10MHz ref > from external inputs. We just happen to have board mounted GPSDOs in all > USRPs B210 that we have, but in this example they were not used for > synchronization. > > -- > Piotr Krysik > > Also take into account that I'm not comparing phase signals observed by two different USRPs. What I have shown is for single channel of one USRP in which such jumps are observed (I'm comparing phase of digitally generated sinusoid with phase of recorded one). Same thing, however, can be observed when recording signal with two USRPS in situation where one have board mounted GPSDO and another one doesn't (with simple unwrap(angle(x1.*conj(x2))) where x1 and x2 are signal vectors). Both USRPs synchronized with use of Octoclock-G.
To make the matter simpler to gasp I will check if the same problem can be observed on one USRP B210 with board mounted GPSDO - without any additional hardware. -- Piotr Krysik _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
