Thank Ron, The problem is the maximum supported frequency of the oscilloscope is 1GHz, while the generated frequency is 500 MHz to 6 GHz. Then the Oscilloscope can not capture the waveform with a good enough resolution.
I would like to close this question and thank you very much for your useful information. Best Vào Th 6, 15 thg 11, 2019 vào lúc 21:46 Ron Economos via USRP-users < [email protected]> đã viết: > Try reducing the gain in the UHD Sink block. At full output, the waveform > will be compressed. > > You can also set your Signal Source frequency to zero. > > Ron > On 11/15/19 07:05, Van-Dung PHAM wrote: > > Dear @Ron, > > Thank you for your kindly reply > > As you said, I change the frequency to 50MHz-6GHz, and I the Oscilloscope > I got the correct frequency as I want > > However, the shape of the signal isn't really sinus. The maximum sampling > rate of my oscilloscope is 5 GSa/s > > Do you think the sample rate could change the shape of the sine waveform? > (I set the samp_rate=50MHz) > > Best, > > Van-Dung > > > Vào Th 6, 15 thg 11, 2019 vào lúc 13:30 Malik Saad via USRP-users < > [email protected]> đã viết: > >> Dear, >> >> You can change the signal waveform (fro signal source) from sine to >> cosine. >> >> On Fri, Nov 15, 2019 at 9:25 PM Ron Economos via USRP-users < >> [email protected]> wrote: >> >>> You can't have a center frequency of 1 kHz in your UHD Sink block. The >>> frequency range of the B200 is 50 MHz to 6 GHz. >>> >>> If you change the center frequency to 50 MHz, you should see a 50.001 >>> MHz signal. >>> >>> Be sure to terminate the output of the B200 with 50 ohms. With Gain Type >>> = Normalized, Gain Value = 1 and Amplitude = 1 in the Signal Source, you'll >>> be transmitting at maximum power. >>> >>> Ron >>> On 11/15/19 00:44, Van-Dung PHAM via USRP-users wrote: >>> >>> Dear all, >>> >>> I am a newbie in this domain. I want to generate a cosine waveform in >>> the output of usrp-B200 (TX/RX). So I make it as the following picture >>> [image: image.png] >>> But what I got in the oscilloscope is not a cosine/sine waveform. I >>> don't know where I have a mistake. >>> >>> Thank you very much for your answers >>> >>> >>> >>> >>> _______________________________________________ >>> USRP-users mailing >>> [email protected]http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >>> _______________________________________________ >>> USRP-users mailing list >>> [email protected] >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >> _______________________________________________ >> USRP-users mailing list >> [email protected] >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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