Hi Petr, You'll have to use timed commands for starting your transmissions. This can be done in GRC, but requires writing some code to issue the commands. Usually I find it easier to add the commands to the generated Python if I'm not changing the application very often.
Here's a C++ example that shows timed stream commands. You'd need to use these for both the transmit and reception side. https://github.com/EttusResearch/uhd/blob/master/host/examples/test_timed_commands.cpp#L111 Regards, Derek On 10/04/2019 14:18, Horký Petr wrote: > > Dear GNU Radio users, > > I have a simple program, Signal source (square) -> USRP SINK USRP > SOURCE - > TIME SINK. > > If I plot Tx/Rx signals in a /Time sink/, I see, that there is a time > differnce, which is OK. But each time I start the program, the time > difference changes (As shown in a picture in attachements). > > What can I do? I tried to change Sync, Clock rate, Clock Source, Time > source....everything. But still the delay is changing each time I > execute my program. > > > If the delay was not random I could just substract that. This causes > me problems in every radar program, since I need precise time > measurements. > > > Regards > > Petr > > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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