What would cause your FM transmission audio to be distorted on voice peaks?

The audio distortion in FM transmission during voice peaks is commonly caused by over-modulation, which occurs when the audio signal exceeds the transmitter's modulation limits. When someone talks too loudly into the microphone, the levels can spike, causing the transmitter to produce distorted output. This is particularly noticeable in FM transmissions where the modulation index becomes too high, leading to a loss of fidelity and clarity in the audio signal.

In contrast, having an inverted repeater offset, needing to talk louder, or an excessively high transmit power typically do not directly cause distortion during voice peaks. An inverted repeater offset affects the ability to access the repeater but does not impact audio quality in the same way. Similarly, needing to talk louder suggests that the input level is too low rather than too high, which would not lead to distortion. High transmit power could lead to other issues like interference but would not inherently distort the audio signal due to voice peaks like over-modulation from talking too loudly would.