Hi Mark, I've added back on the list, it's useful to keep everyone in sync with progress.
The WX FFT only takes one input but the QT Frequency Sync has a configurable number of inputs. In general the QT GUIs are being promoted over WX. Regards, Derek On Tue, Aug 1, 2017 at 7:40 PM, Mark Koenig < mark.koe...@iubelttechnologies.com> wrote: > Thank you for the reply Derek. > > > > I set up a flow diagram in GNU radio companion with the USRP Source having > 2 outputs and I want to route that to a WX GUI FFT sink, which accepts only > one input. Do I add an “add” block between the USRP source and GUI FFT > Sink or a different block? > > > > Thanks > > > > Mark > > > > *From: *Derek Kozel <derek.ko...@ettus.com> > *Date: *Tuesday, August 1, 2017 at 11:11 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 > > > > 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 > > > > >
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