Hi all, Marcus, I continue trying to generate the square signal as a clock but now by means of a FPGA.
The square signal, that I generated, has *a period of 100 ns and a Vpp of 0.65 V (in attached). *These values are correct in order to feed a USRP? Thanks in advance. Best regards, Alejandro 2018-04-06 16:28 GMT+02:00 Marcus D. Leech <mle...@ripnet.com>: > On 04/06/2018 10:16 AM, ALEJANDRO BLANCO PIZARRO wrote: > > Hi Marcus, > > Thanks a lot! What GPSDO do you recommend? We need to buy one. > > Best regards, > Alejandro > > Most Ettus customers with more than a single USRP tend to use the > Octoclock-G: > > https://www.ettus.com/product/details/OctoClock-G > > > > > 2018-04-06 16:00 GMT+02:00 Marcus D. Leech <mle...@ripnet.com>: > >> On 04/06/2018 08:29 AM, ALEJANDRO BLANCO PIZARRO wrote: >> >> Hi all, Marcus, >> >> Thanks for the answer, it was really useful. Now, I am trying to generate >> the 10Mhz signal using a vector signal generator, but the signal is nor >> really pure because the signal generator bandwidth is only 60MHz. Also, the >> Vpp of the signal is 1.4 V, is it correct? >> >> If someone can see the signal (in attached) and tell me if I can use it >> as an external clock, it will be really helpful. >> >> Best regards, >> Alejandro >> >> What is the stability of your vector signal generator? I suspect that >> it's much worse than the on-board clocks. >> >> You'd do better to use an external GPSDO to feed to your two X310. >> >> >> >> 2018-04-05 16:34 GMT+02:00 Marcus D. Leech via USRP-users < >> usrp-users@lists.ettus.com>: >> >>> On 04/05/2018 06:20 AM, ALEJANDRO BLANCO PIZARRO via USRP-users wrote: >>> >>>> Dear community, >>>> >>>> I would like to add an external clock to two USRP in order to have the >>>> same clock discarding possible synchronization issues. The desirable >>>> frequency of the clock would be 184 MHz (compatible with LTE). >>>> >>>> And I was wondering about what will be the possible solutions: >>>> >>>> --> It is possible to use a sine signal with a desirable frequency as >>>> an external clock? In this case what will the amplitude of the signal be? >>>> Unfortunately, I do not have a PWM generator in order to use it as a clock. >>>> >>>> --> It is possible to use another USRP as an external clock using a >>>> transmit basic daughterboard ? >>>> >>>> Thanks you so much in advance. >>>> >>>> Best regards, >>>> Alejandro >>>> >>>> X310 supports an external clock already, via the 10MHz front-panel >>> input. The master clock (which can be 184.32Mhz, to support LTE) is then >>> derived >>> from that. Just feed a 10Mhz clock to all your X310s. >>> >>> See: >>> >>> https://kb.ettus.com/Synchronization_and_MIMO_Capability_wit >>> h_USRP_Devices >>> >>> >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >> >> >> > >
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