Hello, We have the exact same problem. My lab is waiting on some sfp+ cables so in a few days I will share our screenshots, code, and data binary files in order to provide this thread with a second example of this issue. For now, all I can say is this problem is not isolated to your N310 or Windows.
We have two N310's running with the same version of UHD (and GNUradio 3.7.13.4) on Linux kernel 4.18. By using amplitude sliders in GNUradio we found that there is a very small and strange gain "Goldilocks" zone around .002 that gives good results. Going higher starts to raise the noise floor until all signal definition is gone. Ali Dormiani UCSD Noiselab On Wed, Oct 10, 2018 at 11:33 AM Mathieu Lizée via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi, > > When using the UHD "tx_waveforms" example, I can see that the signal > emitted by my N310 USRP is saturated when it’s not supposed to be. > > Here's a snapshot of the signal when I set the amplitude to 0.003: > .\tx_waveforms.exe --rate 12.5e6 --nsamps 1250000000 --freq 1575.42e6 > --ampl 0.003 --otw sc16 --wave-type SINE --wave-freq 10e3 --channels 2 > > [image: tx_waveforms_3e-3_amp] > <https://user-images.githubusercontent.com/15334138/46685506-a7424700-cbc3-11e8-926e-b0da5f416652.png> > > Here's a snapshot of the signal when I set the amplitude to 0.03: > .\tx_waveforms.exe --rate 12.5e6 --nsamps 1250000000 --freq 1575.42e6 > --ampl 0.03 --otw sc16 --wave-type SINE --wave-freq 10e3 --channels 2 > > [image: tx_waveforms_3e-2_amp] > <https://user-images.githubusercontent.com/15334138/46685468-9265b380-cbc3-11e8-9ce7-42908cf9bf2e.png> > > As you can see from the pictures above, it seems that there's a saturation > in the signal when the amplitude is set to 0.03 (which is unexpected with > such a small amplitude). We have double-checked with a X300 device, and the > signal is normal in both cases. > > Do you have an idea of what could be wrong, or a suggestion to try on our > side? > > Technical Information: > > - Windows 10 > - USRP N310 > - UHD 3.13.0.3-rc1 > > > Thank you! > > -- > *Mathieu Lizee* > *Software Development Intern* > > *Skydel Solutions* > WeWork 5th Floor (Skydel) > 1275 Av des Canadiens-de-Montreal > Montreal, QC > H3B 0G4 > _______________________________________________ > 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
