# Receivers

### Explanation of question 4

Fig. 22.1 is the block diagram of a t.r.f. receiver. The sequence X, Y, Z will be

1. detector, RF amplifier, AF amplifier
2. RF amplifier, detector, AF amplifier
3. detector, AF amplifier, AF amplifier
4. RF amplifier, AF amplifier, detector

The answer is :- 2 The first stage is the r.f. amplifier, selecting and amplifying the required signal. Next, the output is fed to the detector, where the r.f. signal is converted to an a.f. signal. This signal is then amplified by the a.f. amplifier and fed to a loudspeaker.

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