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

Options

A. to reduce the amplitude ofthe 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 these

Explanation

### Step-by-Step Solution:

1. **Understanding Frequency Modulation (FM):**
- In FM, the information signal is used to vary the frequency of the carrier wave, rather than its amplitude. This makes FM less susceptible to noise and interference compared to amplitude modulation (AM).

2. **Role of the Amplitude Limiter:**
- An amplitude limiter is a device used in FM receivers to ensure that the amplitude of the received signal remains within a certain range. This is crucial because FM signals can experience variations in amplitude due to various factors.

3. **Reasons for Amplitude Variations:**
- Amplitude variations can occur due to:
- Man-made interference (e.g., electronic devices).
- Geographic factors (e.g., terrain affecting signal strength).
- Intermixing of other frequencies (cross-talk from nearby channels).

4. **Function of the Amplitude Limiter:**
- The primary function of the amplitude limiter is to eliminate unwanted amplitude variations in the received FM signal. It does this by clipping the peaks of the signal that exceed a certain threshold, ensuring that only the frequency variations (which carry the information) are preserved.

5. **Outcome of Using an Amplitude Limiter:**
- By removing unwanted amplitude variations, the amplitude limiter helps maintain the integrity of the frequency-modulated signal, allowing for clearer reception and better quality of the transmitted information.

### Final Answer:
The function of an amplitude limiter in an FM receiver is to eliminate any changes in amplitude of the received FM signal, ensuring that only the frequency variations, which carry the information, are preserved.