# F.M., A.M. and S.S.B. transmitters

### Explanation of question 9

The audio bandwidth in an AM transmitter may be restricted by the use of

1. a high-pass filter in the modulating circuit
2. a low-pass filter in the modulating circuit
3. a resistor in the microphone circuit
4. magnetic saturation of a coil in the microphone circuit

The answer is :- 2 A low-pass filter in the modulating stage is used to limit the audio bandwidth to about 2.5 kHz.

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