On 06/27/2018 11:31 AM, Rob Kossler via USRP-users wrote: > Hi, > I am getting some unexpected behavior from my N310 using the example > 'tx_waveforms' utility and stock FPGA image using 'rfnoc-devel'. If I > simply switch to 'maint', things behave as expected. Here are the issues... > > 1. With 'rfnoc-devel', it is necessary for me to specify a subdev spec > (A:0 A:1 B:0 B:1) in order to access all 4 channels. Otherwise, I > can only see 2 channels. This is not a big problem, but wanted to > mention it because it appears that the default subdev spec is not > correct. With 'maint', all 4 channels are available with default > subdev spec.
Rob, this is now fixed (on master, which has all the RFNoC stuff). > 2. With 'rfnoc-devel', I get unexpected TX output power levels on the > various channels when using the example program 'tx_waveforms' with > the 'constant' waveform which produces a single tone at the carrier > frequency (see table below). Thanks for bringing this up, also, thanks for providing the graph in the other thread. On master, this is now fixed. > 3. With 'rfnoc-devel', I can only run 1 channel at a time. If I specify > more than one channel (e.g., '--channels=0,1'), I get an error > message that the PPS is not detected (even though using 'internal') > and the example program crashes. With 'maint', multiple channels > work fine. Even on the same commit hash, I don't see that issue. Can you please check current HEAD of master again? I'd really like to get you unstuck here, but I don't see a clear path forward. It's very interesting this is not an issue on maint. -- M > > The table below shows the measured RF power levels (dBm) for a single > tone output at 2400 MHz. The tx_gain setting was 45 (20 dB below > maximum) and there was about 31dB external attenuation. So, for a > measured power of -28 dBm, this implies that the maximum usrp output > power is +23dBm (-28 + 20 + 31). > > Channel maint rfnoc-devel > 0 -27.8 -27.8* (some trials ~-67) > 1 -27.9 -66.6* (some trials ~-27) > 2 -27.6 -39.9* (some trials ~-67) > 3 -27.6 -54.6* (consistent) > > Details: > > * maint hash: ad6b0935 > * rfnoc-devel hash: 1f8463cc > * command line: tx_waveforms --rate 20e6 --freq 2400e6 --gain 45 > --channels <ch> > * os: ubuntu 16.04 > > Thank you. > Rob > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > _______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
