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Please notice the bottom half of the graphic user interface - where it says 'Spectrum'.


Now please notice the narrow, tall green line at 1khz; that is the signal w/o any distortion around it.  That is because I turned down the volume on the radio low enough to get the noise around it to settle down.  Experiment until you get a similar picture.  If you can't; then either you are doing something wrong or your sig/gen is just too unstable or even generating too much internal noise to make the SINAD program work as designed.