What is the Tx gain of your WBX? What is the Rx gain of your SBX?
What is the power your signal is going out at in dbm? Assuming: 10MHz reference and 1PPS cables are all same length. Both USRPs have been recently calibrated with utilities. Splitters change phase, although I am not sure that it would make things vary as your graph illustrates... > On June 7, 2018 at 10:03 AM Kenneth Collier via USRP-users > <[email protected]> wrote: > > Hello All, > > I have an X310/WBX-120 transmitting a 500kHz tone @ 1.6GHz through a > power divider to RF A Rx and RF B Rx on an X310/SBX-120. The 10MHz reference > for both devices is sourced from an Octoclock-G using its internal reference. > The PPS reference for both devices is also sourced from the Octoclock-G which > is connected to an active GPS antenna. The sample rate is 2.5 MS/s. I am > using UHD version 3.11.1.0-0-gad6b0935. > > My hope is that the list can provide some insight on whether or not the > variation vs time that I'm seeing when comparing the phase between the signal > received on the two ports of the X310 is expected. There is very little drift > but the phase variation oscillates within a few degrees (~+/-2deg). Please > see the attached plot for reference. Here the mean phase difference is 4 > degrees with a standard deviation of .5 degrees. I am using integer-N tuning > on both Tx and Rx since the phase deviations are noticeably worse using > fractional-N tuning. > > Thanks in advance for your feedback. > > Ken > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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