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

From: Josh Blum
Subject: Re: [Discuss-gnuradio] scope display bug? distortion of sine wave at high frequency
Date: Tue, 11 Aug 2009 15:42:53 -0700
User-agent: Thunderbird (X11/20090608)

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


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.







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