Question

The function of an amplitude limitter in an FM-receiver is

• A. to reduce the amplitude of the signal to suit IF amplifier.
• B. to amplify low frequency signal.
• C. to eliminate any change in amplitude of receiver FM signal.
• D. None of the above.

Answer 1

The correct option is C to eliminate any change in amplitude of receiver FM signal.

The limiter removes from the carrier all amplitude variations which may caused by changes in the transmission path, by man-made static or natural static. This suppression of amplitude variation is necessary because FM-receives, a vary large improvement in $\frac{S}{N}$ results from this.