Can you post the flowgraph you're using again? If you changed transmit gain and amplitude, the result should have changed in amplitude, while the image you just sent has the fame magnitude the last one did.
On Wed, Jun 19, 2019, 5:03 AM Simona Sibio <[email protected]> wrote: > Thank you very much. > I tried to send a signal with this features, but the result is the same > (IMG_6590). > I tried with every amplitude and every gain (Screenshot from 2019). > Before, I thought that it was a problem of reference signal and I changed > it but the situation is not changed. > > Thank you in advance for your help. > > Best Regards, > > Simona > > Il giorno mar 18 giu 2019 alle ore 18:06 Nick Foster <[email protected]> > ha scritto: > >> Turn up the transmit gain on the USRP sink. Start with ~40dB and transmit >> amplitude 0.3. >> >> Nick >> >> On Tue, Jun 18, 2019 at 9:40 AM Simona Sibio <[email protected]> wrote: >> >>> 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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