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] <mailto:[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] <mailto:[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.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




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