Thank you Marcus for help! Now I' m using Usrp with SCFDMA chain. I set_time_now and start_time_now :
uhd_usrp_source.set_time_now (uhd.time_spec_t(time.time())) uhd_usrp_source.set_start_time(uhd.time_spec_t(time.time()+0.6)) uhd_usrp_sink.set_start_time(uhd.time_spec_t(time.time()+0.6)) and I haven't time shift. But I see a lot of "L" (late packet) printed and some "U" (underflow). How can solve the problem? I have tried to use low sample rate but after few seconds L and U appear. Thanks Leo 2015-09-02 16:41 GMT+02:00 Leonard Foxes <[email protected]>: > Hi everyone! > > > I’m new to Gnuradio e USRP. I use a USRP N210 with WBX daughterboards and > loop back cable to connect TX e RX. I have tested USRP with a simple > flowgraph (sine , usrp_sink , usrp_source) and I have observed that the > output signal from usrp_source block is time shifted. I mean, the usefull > output signal starts after 0.0105 seconds. How can avoid this? I have tried > to use “issued_stream_cmd”, setting time_spec=0.0105 s but nothing has > changed. > > > I want to use this USRP in a more complex project and I need to remove > this initial time-shift. > > > I attach a plot of input and output signal and my flowgraph. > > > Thanks in advance for help, > > > Leo >
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