Hi Leonard, you should try to use set_start_time(time_spec_t(x)) on both the USRP sink and source, but only after setting a device time using set_time_now() before, that should be sufficiently (>0.1s) earlier than x, before you start the flow graph.
Best regards, Marcus On 02.09.2015 16:41, Leonard Foxes wrote: > > 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 > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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