Hi Alejandro, Phase sync is not possible with CBX <https://kb.ettus.com/CBX#Phase_Synchronization>. Time sync and freq sync should work, but keep in mind the following:
- The actual freq transmitted is a function of the quantized LO setting and the more finely quantized DUC setting. The final value is not necessarily "exactly" what you ask for. So, the delta between your 2 signals may not be exactly 80 MHz (perhaps off by a fraction of a hertz because of the quantizations). - The two transmissions do not share the same LO. Each channel has its own PLL that is locked to the 10 MHz ref, but there will be some variability between the two PLL Rob On Thu, Mar 5, 2020 at 10:29 AM ALEJANDRO BLANCO PIZARRO via USRP-users < [email protected]> wrote: > Dear USRP community, > > I am trying to send 160MHz WiFI signal by a x310. Unfortunately, I do not > have the UBX which allows bandwidth of 160MHz, so I am using two CBX of > 120MHz each one. > > We properly split the 160MHz wifi signal into two 80MHz signals. Our aim > is to send each 80MHz signal by one of the CBX so that we can transmit the > whole bandwidth. We transmit each signal in two 80MHz WiFi channels > (contiguous channels). > > The issue is that we are using a commercial router as a receiver and it > cannot detect the 160MHz signal (80 + 80). I am wondering if the two CBX of > the x310 are completely synchronized or not. From my point of view, the > clock and the PLL should be the same for the two CBX but, is there > something that I am missing? Because the central frequencies are not the > same for the transmission, so I do not know if this creates synchronization > or carrier frequency offset issues. > > I do really appreciate any information you can provide about time, > frequency and phase synchronization of the two daughterboards using > different central frequencies. > > Best, > Alejandro > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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