Thank you for the assistance. I tried to change the amplitude but the amplitude and frequency are not accurate in the oscilloscope yet. If I lower the amplitude, the S/N is lowered then it is worst.
Best Regards, Simona Il giorno mar 18 giu 2019 alle ore 18:33 Nick Foster <[email protected]> ha scritto: > 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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