>> >> I have just been corrected by one of my colleagues at Ettus. >> >> While there is an up conversion stage for frequencies below 450Mhz, the LO >> for that stage is fixed frequency, and derived from the sample clock and >> coherent across channels. >> >> So there should be no random phase offset among channels even below 450Mhz >> when LO sharing. >> >>> This is correct as far as I know. Although I don’t have an N320 in my lab, >>> it uses an up conversion scheme for lower frequencies. That scheme does not >>> participate in the LO sharing. >>> >>> Sent from my iPhone >>> >>> >>> On Jul 18, 2019, at 11:17 AM, Sammy Welschen via USRP-users >>> <usrp-users@lists.ettus.com> wrote: >>> >>> I have to acquire phase coherent data on multiple channels using USRP >>> N310/320 devices. >>> >>> >>> >>> Am I correct in assuming that for frequencies below 450 MHz, there is no >>> way to remove random phase differences between channels due to the >>> additional frequency shift involved (shown for example in the block diagram >>> http://www.ettus.com/wp-content/uploads/2019/03/N320BlockDiagram.png)? As >>> I understand it, by using the same LO signal for all channels I could >>> remove the differences for frequencies above 450 MHz, but this is of no use >>> for frequencies below 450 MHz due to this the additional stage. >>> >>> _______________________________________________ >>> 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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