Thanks Marcus. A quick follow-up question:
Should the length of my ethernet cables (to the GigE switch from each of the USRPs that I am trying to synchronize) match so that I get time-aligned I/Q samples ? Thanks! On Mon, Jul 18, 2016 at 12:20 PM, Marcus Müller <[email protected]> wrote: > They always align at the beginning. The file size difference is really > just because due to the nature of general purpose hardware and GNU Radio's > scheduling, there's no guarantee all blocks have written the same amount of > data when you kill the flow graph. > > Am 18. Juli 2016 17:46:13 MESZ, schrieb avinash kalyanaraman < > [email protected]>: >> >> Thanks Martin. >> >> Is there any particular reason why I see different file sizes for the >> former (file-sink) case? I ctrl+c the hand edited python file to stop >> sample collection. The file sinks are unbuffered. Since they are of >> different sizes, is there a way to know which samples align in time ? >> >> Thanks! >> >> On Fri, Jul 15, 2016 at 5:30 PM, Martin Braun <[email protected]> >> wrote: >> >>> This'll work. However, the uhd_rx_cfile utility that comes with GNU >>> Radio will do that for you. >>> >>> Cheers, >>> M >>> >>> On 07/15/2016 11:33 AM, avinash kalyanaraman wrote: >>> > Hi all, >>> > >>> > I want to analyze the I/Q samples of 3 synchronized USRPs (connected to >>> > an Octoclock G). I have synchronized the USRPs according to >>> > http://files.ettus.com/manual/page_sync.html (i.e. I hand-modified the >>> > python file generated by GRC). >>> > >>> > I am feeding the output of my USRP Source block (with 3 channels and 3 >>> > motherboards) to three file sink blocks. Would this be enough to save >>> my >>> > synchronized I/Q samples ? >>> > >>> > I notice that the size of the three files (storing the I/Q samples) >>> > aren't the same after my run. >>> > >>> > Attached is also a screenshot of the GRC file. >>> > >>> > Thanks! >>> > >>> > -- >>> > Avinash >>> > >>> > >>> > _______________________________________________ >>> > Discuss-gnuradio mailing list >>> > [email protected] >>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> > >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> [email protected] >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> >> >> > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > -- Avinash
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