FIG

Loud High Note

Soft High Note

In the case of Frequency Modulation there is no such inherent limit to the modulation permissible. Complete modulation is that frequency shift agreed upon by the engineers as 100% modulation and all transmitters and receivers have to be designed to operate satisfactorily with this frequency deviation (swing). Most FM transmitters of good design will actually modulate without distortion far above 100%. The limit of modulation is usually to be found in the FM receiver selectivity and limiter action, which will be explained in another section.

Time

Time

Loud Low Note

Soft Low Note

Loud High Note

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