Mark, There is an Ettus UHD-only utility called kitchen_sink that can do multiple channels to file (either one file interleaved or multiple individual files, I believe). This is not in the examples folder but in "uhd/tools/kitchen_sink". This does not automatically compile with the overall build of uhd and examples, but you can create a build folder and compile this individually. The command line options are numerous so it is a bit complex, but it can do the job of recording multiple of channels of incoming data to file.
Rob On Tue, Aug 1, 2017 at 11:10 AM, Derek Kozel via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi Mark, > > Unfortunately you're up against the limits of the included examples. There > are no UHD only examples which store multiple channels of samples to a > file. The rx_multi_samples shows the steps involved in setting up the > channels, but doesn't implement the functionality shown in > rx_samples_to_file to write to a file. > > Yes, uhd_fft can be used to view multiple channels. GNU Radio's framework > makes it easy to implement the more advanced application layer features. > The arguments will be almost the same as for rx_multi_samples to file. > Check out the help message for uhd_fft to see all the options. Simply > supplying the frequency of interest and the same --channels 0,1 should show > you plots of both channel's spectrum and time series data. > > To save data from both channels you will need to construct a flowgraph in > GNU Radio. There are some examples supplied with gr-uhd which demonstrate > the basics of connecting and configuring the USRP source. If you have > trouble let us know here or on the GNU Radio mailing list. > > Regards, > Derek > > On Tue, Aug 1, 2017 at 3:14 PM, Mark Koenig <mark.koenig@ > iubelttechnologies.com> wrote: > >> Thanks Derek. >> >> >> >> I was setting up rx_multi_samples the following way: >> >> >> >> ./rx_samples –args=”addr=192.168.40.2” –nsamps=10000000 –rate=100e6 >> –sync=now –subdev=”A:0 B:0” –channels=”0,1” >> >> >> >> I see a lot of verbose output, like: >> >> >> >> Received Packet: 1996 samples, 1 full secs, 0.500000 frac secs >> >> >> >> But, I don’t get any file outputs or anything else. The collection ends >> and I am left wondering what just happened. Can I use uhd_fft to look at >> the MIMO stream? >> >> >> >> Also, there is no place to enter a frequency to collect, should there be? >> >> >> >> Mark >> >> >> >> *From: *Derek Kozel <derek.ko...@ettus.com> >> *Date: *Tuesday, August 1, 2017 at 10:08 AM >> *To: *Mark Koenig <mark.koe...@iubelttechnologies.com> >> *Cc: *"usrp-users@lists.ettus.com" <usrp-users@lists.ettus.com> >> *Subject: *Re: [USRP-users] Trying to verify Rx MIMO operation of x310 >> >> >> >> Hello Mark, >> >> rx_samples_to_file will only receive a single channel. It is a minimal >> example. >> >> Try: >> >> rx_multi_samples --channels 0,1 >> >> This will receive two channels, a pair of UBXs only has one RX channel >> per daughterboard so UHD can infer the sub device specification. The >> default sample rate is 100 MS/s so both channels will fit into a single 10 >> GigE connection. Make sure to follow the advice of any warnings printed to >> improve the throughput of your network interface card. >> >> If you have an external 1PPS source you can add `--sync pps --secs 0.1` >> to the above parameters to synchronize the two channels. The example >> currently forces an external source when synchronizing. If you >> remove/comment out line 98 and recompile it will use the internal source. >> >> Regards, >> >> Derek >> >> >> >> >> >> >> On Tue, Aug 1, 2017 at 2:46 PM, Mark Koenig via USRP-users < >> usrp-users@lists.ettus.com> wrote: >> >> I currently have an x310 with a ubx-40 in each of slots A and B. I have >> one 10Gig Ethernet connection hooked up, and would like to receive on both >> channels A and B. >> >> >> >> I tried using the “rx_multi_samples” function, but I didn’t get a good >> feeling I was collecting on both channels. I tried using the >> “rx_samples_to_file” function, but didn’t see a coherent collection on A >> and B, when setting the subdev to “A:0 B:0”. >> >> Finally, I tried the “uhd_fft”, and saw collection in channel A, but >> nothing from channel B, while setting subdev=”A:0 B:0”. >> >> >> >> Am I doing something incorrectly, or is there another function I should >> try? >> >> >> >> Thanks >> >> >> >> Mark >> >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >> > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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