1. Adjust the microphone gain. The microphone gain controls the level of the signal from your microphone to the radio. If the microphone gain is too high, the signal will be over-modulated. To adjust the microphone gain, turn the MIC GAIN knob clockwise until the modulation indicator on the radio just begins to light.
2. Use a properly grounded antenna. A properly grounded antenna will help to prevent over-modulation by providing a good electrical connection to the radio.
3. Use a low-power transmitter. A low-power transmitter will produce less signal than a high-power transmitter, which can help to prevent over-modulation.
4. Speak clearly and at a moderate volume. When speaking into the microphone, speak clearly and at a moderate volume. This will help to prevent the signal from being distorted.
5. Use a speech compressor. A speech compressor can help to prevent over-modulation by reducing the dynamic range of the signal.
If you are experiencing over-modulation, try adjusting the microphone gain, using a properly grounded antenna, using a low-power transmitter, speaking clearly and at a moderate volume, and using a speech compressor. If you are still experiencing over-modulation, you may need to have your CB radio repaired.