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<mailto: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<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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