What is the primary purpose of the AFC mixer in FM receivers?

The primary purpose of the AFC (Automatic Frequency Control) mixer in FM receivers is to minimize noise. In FM (Frequency Modulation) systems, the quality of the received signal can be affected by various types of noise and interference. The AFC works by tracking the frequency of the incoming signal and adjusting the local oscillator within the receiver to maintain alignment with the signal. This constant adjustment helps to improve the signal-to-noise ratio, allowing the receiver to effectively filter out unwanted noise and enhance the clarity and quality of the audio output. By minimizing the noise, the AFC ensures that the listener receives a clearer and more stable signal.

While amplifying signals and creating harmonics are functions that can be performed in other parts of the receiver circuit, they are not the primary role of the AFC mixer. Similarly, converting frequency to amplitude is a function associated with demodulation rather than the specific purpose of the AFC in managing signal clarity and minimizing noise interference.