Hi Nick, Thanks for the info. Sure, I would have to take the analog parts into account too. I was hoping to know the latency at microseconds level at least. I do not have an oscilloscope. Wouldn't it be possible to know the minimum latency introduced by the digital filters at least?
Regards On Sun, Feb 2, 2020, 23:16 Nick Foster <bistrom...@gmail.com> wrote: > You will also have latency introduced by the ADCs themselves, as well as > baseband analog filters if applicable. If you need very accurate > calibration of arrival time, it is best to generate an accurately timed > calibration signal using a GPS reference. You could continue to use your > TX/RX loopback test, adding an oscilloscope to measure the time between the > PPS rising edge and the RF output to determine TX latency. > > On Sun, Feb 2, 2020, 1:41 AM YENDstudio . via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi, >> >> I want to know the actual timestamp of TX and RX signals at the RF >> antenna. For this I have add/subtract the group delay introduced by digital >> filters in the TX and the RX paths from the UHD timestamp. Through loopback >> test, I am able to calculate the aggregate delay, but cannot know the TX >> delay and the RX delay separately. The UHD driver has APIs to get the list >> of filters used in the signal paths. But my calculated values do not match >> with the loopback delay I measured. Could someone help me with this? I am >> using USRPB200 set with 30.72 MHz master clock rate and 1.92 MHz sampling >> rate. >> >> Regards! >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >
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