It’s like the semantics of “pC clock” synch causing this. Try changing to “unknown PPS”
Sent from my iPhone > On Mar 31, 2021, at 10:43 AM, Lorenzo Bertizzolo > <[email protected]> wrote: > > > Hi all, > > I am experiencing a time synchronization issue internal to the USRP X310. > With the help of an oscilloscope, I measured an (apparently) constant delay > between the two X310 output TX ports of approximately 10~14 µs (picture > attached). > > I tried different bandwidths, both UHD 4 (UHD 4.0.0.0-25-g1a34ba8a) and UHD > 3.15 (UHD 3.15.0.0-62-g7a3f1516), and different X310 hardware, always > experiencing the same time delay. > > To track down this issue I simplified my flowgraph. It now feeds data to the > two UHD USRP sink channels from file, using `packet_len’ tags accordingly > (picture attached). > I verified thanks to the QT scope that the two streams enter the USRP Sink > with the two tags at the same time. > > Setup:USRP X310 / UBX daughterboards / Gnuradio 3.8 with UHD 4, Gnuradio 3.7 > with UHD 15 > > > It seems that either the USRP sink block or UHD are not sending out the > samples at the same time from the two X310 TX daughterboards. > Is there any misconfiguration in my setting that could be the root cause of > this issue? > > Thanks, > Lorenzo > <image001.png> > <image002.png> > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected]
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