Waveform source amplitude is too high. Turn it down to <0.4. On Tue, Jun 18, 2019 at 9:31 AM Simona Sibio via USRP-users < [email protected]> wrote:
> Hi Michael, > > thank you for your interest. > > I have two N200 and each one have two daughterboard UBX-40; the > transmitters are connected by coaxial cable to an oscilloscope > (Rhode&Schwarz RTO2064) to check the waveform. > The version of UHD is 3.13.0. > > I tried to send a constant signal using the flowgraph (Screenshot from > 2019-06-18 14-56-57) in attachment on GNU radio Companion 3.7.13.4, and on > the oscilloscope I saw this "IMG_6586". > Also, I tried to generate a constant signal in Simulink model (16-42-17 & > 16-14-04) on Matlab R2019a but, on the oscilloscope, I saw this "IMG_6584". > > I tried to send a sine signal with the Simulink model in attachment > (16-46-10) and, on the oscilloscope, I saw this "IMG_6583". > Also I tried to generate the sine signal with GNU radio (17-08-58) and I > saw this "IMG_6588". > > It is possible to see how the amplitude and frequency change in every > case, I need to obtain an accurate signal because I have to measure the > amplitude and phase in a particular point in the circuit. > And in the previous email, I added that the problem increases when I lower > the carrier frequency. All these measures were taken with a carrier > frequency at 3 GHz, but if I change the fc at 1 GHz the shape is worst, > e.g. IMG_6589. > > Thank you in advance. > > Best Regards, > > Simona > > > Il giorno mar 18 giu 2019 alle ore 15:34 Michael Dickens < > [email protected]> ha scritto: > >> Hi Simona - Can you please educate us as to a few items? >> >> * your setup: you have an N200 + some daughterboard (which one) + some >> spectrum analyzer (which one), connected ?somehow? -> are you doing actual >> wireless Tx -> Rx, or do you have a cable hooked up between the N200 & >> spectrum analyzer? >> >> * what waveform you're trying to generate, and what is the actual >> flowgraph you're using for GNU Radio? how are you generating the waveform >> in MATLAB? >> >> * which version of GNU Radio and UHD are you trying to use? >> >> * which version of MATLAB and it's UHD are you trying to use? >> >> The above might help someone to diagnose your issue ... without it, we >> can make some guesses but not much in the way of specifics. >> >> Please remember to "reply all", so that others can see your response and >> be able to chime in to provide help. - MLD >> >> On Tue, Jun 18, 2019, at 8:42 AM, Simona Sibio via USRP-users wrote: >> >> Dear Sir/Madam, >> >> I am Simona Sibio, a student in Heriot Watt University. >> I am working with USRPs both on Matlab and on Gnuradio, and with both >> softwares I have the same problem: the shape (generated by >> N200+daughterboard 10 MHz to 6 GHz) is not accurate, in attacched some >> photos. >> At 1 GHz, the shape is worst than when the carrier frequency is 3GHz. >> It is not possible to measure the amplitude and frequency because, also >> at 3 GHz, it is not stable. >> Could you help me? >> >> Thank you in advance. >> >> Best Regards, >> >> Simona >> >> >> _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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