Are you plotting a absolute magnitude or just the magnitude in real/imag axis ? If this is the magnitude for real or imag signal alone, then the result makes sense. Since the cable length and several factors will result in different projection value of the total magnitude in each real and imag axis. The amplitude is only the same for the absolute magnitude.
On Fri, Sep 28, 2018 at 10:18 AM Yun Li via USRP-users < usrp-users@lists.ettus.com> wrote: > I tried increasing LO power by 1dB and 2dB and 3dB. No noticable > difference. What is interesting is channel 2 and 3 are from same dboard. > But they are the ones that differ the most. > > Yun > > Marcus D. Leech via USRP-users <usrp-users@lists.ettus.com> 于2018年9月28日周五 > 下午12:58写道： > >> On 09/28/2018 12:45 PM, Yun Li via USRP-users wrote: >> >> Hi there, >> >> I am testing external LO on N310 (UHD_3.13.0.2-1-g78745bda). The setup is >> I have a X310 sending SINE waves to N310's channel 1,2,3 via a splitter. A >> signal generator sends 2x frequency 3dBm signal to N310's LO IN 0/1 and LO >> IN 2/3 via a splitter. According to the doc, there is supposed to be a 180 >> degree phase shift which I did observe in following plot. >> >> [image: image.png] >> >> But the question is why all 3 channels are now having very different >> amplitude. If I use internal LO, the amplitude of all 3 channels are the >> same. >> >> Thanks. >> Yun >> >> What happens if you increase the LO power by 1dB or so? >> >> >> >> _______________________________________________ >> 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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