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What does it mean when we say signal is 20% modulated or 40% modulated? Need detailed explanation. Also i want to know what happens when signal is overmodulated?

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  • \$\begingroup\$ The accepted answer is also incorrect about overmodulation, and this is a product of using a nice simulation, and no understanding. gbarry gave a correct answer. \$\endgroup\$
    – Henry Crun
    Apr 18, 2018 at 8:37

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If carrier (RF) signal is 10V, when the audio modulation is 0V, then 20% modulation means 12V (RF) on +ve modulation peaks and 8V (RF) on negative (audio) modulation peaks.

Overmodulation ,means that on negative modulation peaks the carrier goes hits 0

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