Re: [Discuss-gnuradio] scope display bug? distortion of sine wave at high frequency

[Josh Blum]

what is the sample rate of your signal source? If its samp_rate, which 
defaults to 32KHz, then the plots attached make perfect sense.

-Josh

Milo Wong wrote:
> Hi all,
>
> I found sine waves will be terribly distorted when they are generated at
> relatively high frequency(above 5khz) from signal source in GRC. I set the
> sampl_rate of scope sink to 2Ghz(high enough, I think), and there are always
> spikes on generated sine wave. This problem is especially distinct when
> generated sine wave reaches 20Khz and the waveform displayed on scope sink
> is almost "saw wave". There will be nothing to dispaly if I keep on
> increasing frequency to 1Mhz. Is there anybody who met this problem before?
> or it might only be the display problem in GRC? I guess it might be the
> problem of scope sink which could not achieve that high sweep (sampling)
> rate even I set it correctly.
>
> Attached are snapshot of generated sine waves at different frequencies:
>
>
> Your comments will be very much appreciated.
>
> Thanks,
>
> Milo
>
>
>
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