Thank you very much for clearing that up. -Hai
On Thu, Jun 11, 2020 at 1:11 AM Marcus D Leech <[email protected]> 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 <[email protected]> > 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 <[email protected]> > 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 < >> [email protected]> 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 >> > [email protected] >> > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >
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