Is it important to have PPS signal aligned with reference 10 MHz signal. In my case they come from different sources.
thanks, Dmitry? пн, 18 июн. 2018 г. в 17:37, Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com>: > On 06/18/2018 10:28 AM, Дмитрий Михайличенко via USRP-users wrote: > > The frequency is around 600 MHz. I also tried higher frequencies. The > offset is visible on picture attached. > > thanks, > Dmitry > > If you look here: > > https://kb.ettus.com/UBX > > You can see that for frequencies below 1GHz, you have to use a 20MHz > daughterboard clock for UBX to achieve synchronization. > I don't know if SBX will work correctly with a 20MHz daughterboard > clock, so you can't have "mixed" UBX + SBX on the same > X310. > > Also, integer-N tuning can help maintain better phase synchronization > characteristics: > > https://files.ettus.com/manual/structuhd_1_1tune__request__t.html > > > пн, 18 июн. 2018 г. в 14:50, Дмитрий Михайличенко <mdm...@gmail.com>: > >> Hi, >> >> I have a couple of X310 each of them has UBX+SBX cards. The devices are >> synchronized by external 10MHz + PPS signal. But in my test I see random >> phase delay between all channels that varies between test runs. The test >> creates multi usrp device, sets up time and tunes to the same frequency >> using timed command, then it captures some buffers. The same external >> signal is supplied to all antenna ports. Is it expected to have random >> delay between channels? Is there any way to have constant phase delay from >> run to run? >> >> thanks, >> Dmitry >> > > > _______________________________________________ > USRP-users mailing > listUSRP-users@lists.ettus.comhttp://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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