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Answer by Andy aka for Help interpreting strange spectrum
The peak above the red line is clearly the 30 kHz sine signal but, what are all those peaks below the red line? They are clearly not harmonics of my signal... There are peaks even at frequencies below...
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Answer by Ale..chenski for Help interpreting strange spectrum
The multitude of spurious frequencies in your FF transform are reflections of undersampled higher harmonics of your signal. These are aliases, as you rightfully noted. See this EDN article for better...
View ArticleAnswer by analogsystemsrf for Help interpreting strange spectrum
I see 30/60/90 KHz.I see 15, 45, 75 KHz.I see baseband trash, at dc - 4KHz, with 10 spectral lines of spacing 500Hertz, that get modulated at -65dB down, probably as Amplitude Modulation or Frequency...
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Help interpreting strange spectrum
I am sampling a sinusoidal signal with an oscilloscope and viewing its spectrum using the FFT mode. The signal in time domain is this:and I am getting this spectrum:The peak above the red line is...
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