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Most of the websites i have looked at, say that the frequency of middle C note is approximately 261.626 Hz. and that middle C on guitar is at the 5th string 3rd fret. but my tuner says the frequency at the 5th string 3rd fret is 130.81 Hz.
Since our modulating frequency to carrier frequency ratio (mc-ratio above) is 1.0, we get sidebands at harmonics of the carrier. If we use an mc-ratio of .25 and a carrier of 400: we end up with the same perceived pitch because the sidebands are still at multiples of 100 Hz. has inharmonic sidebands.