See this link <https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices>which shows the phase sync capability for the various X310 daughterboards such as UBX, SBX, CBX, and WBX. Note that the CBX does not have phase sync and the WBX has a 180 deg ambiguity. Rob
On Thu, Jun 11, 2020 at 1:21 AM Hai Nguyen via USRP-users < usrp-users@lists.ettus.com> wrote: > Thank you very much for clearing that up. > > -Hai > > On Thu, Jun 11, 2020 at 1:11 AM Marcus D Leech <patchvonbr...@gmail.com> > wrote: > >> There are critical differences. The X310 was designed to provide a phase >> coherent infrastructure—with that coherence working across multiple units. >> >> The WBX and CBX both have phase resynch which helps tremendously. The >> TwinRx goes further and allows LO sharing, which provides even better >> fidelity of phase coherence. >> >> Sent from my iPhone >> >> On Jun 11, 2020, at 12:57 AM, Hai Nguyen <hai.n.nguyen...@gmail.com> >> wrote: >> >> >> Thank you Marcus. I feel it will be the same story if I use two X310s? >> I look a bit at the project gr-doa and as I understand it seems to just >> require the calibration once. I'm not sure if there is a critical >> difference between the WBX/CBX vs. TwinRX for this task though. >> >> >> On Thu, Jun 11, 2020 at 12:05 AM Marcus D Leech <patchvonbr...@gmail.com> >> wrote: >> >>> No. It is the nature of PLL synthesizers that they won’t land at the >>> same phase offset every time they’re tuned. >>> >>> In addition the DDC components in the FPGA aren’t necessarily going to >>> be at the same phase offset every time. >>> >>> You’ll need to have a phase calibration on every run. >>> >>> Sent from my iPhone >>> >>> > On Jun 11, 2020, at 12:01 AM, Hai Nguyen via USRP-users < >>> usrp-users@lists.ettus.com> wrote: >>> > >>> > >>> > Hello, >>> > >>> > I'm trying to do phase calibration for two B210s for a DoA >>> application. I use a known tone with splitter and equal-length cables. The >>> problem I'm having is, the phase difference between two corresponding >>> channels of the USRP (for example, RX2 of radio A) seems to change not just >>> between the resets of the USRPs, but also between the runs of the UHD >>> program. >>> > >>> > Is this possible to phase-calibrate the two B210s? >>> > >>> > Thank you and best regards, >>> > Hai >>> > _______________________________________________ >>> > USRP-users mailing list >>> > USRP-users@lists.ettus.com >>> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >> _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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