# Receivers

### Explanation of question 21

Fig. 22.3 is a block diagram of part of an SSB receiver. The output at X should be connected to

1. an RF mixer
2. an audio amplifier
3. a local oscillator
4. a beat frequency oscillator

The answer is :- 2 The output from the product detector will be at audio frequency. This is fed to the audio amplifier.

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