Receiver Block Diagram etc. (4c1, 4d1 & 4d2)

Item

Name

Description

1

Tuning and rf amplifier

·          Tuning selects just the signal we want to hear from all the many different radio signals being transmitted on different radio frequencies.

·          Tuning uses tuned circuits consisting of inductors (coils of wire) and capacitors.

·          The rf amplifier increases the signal received from the air by the antenna.

·          Antenna are connected to receivers by special wires known as feeders.

2

Detection

·          Detection is the process of recovering the original modulating signal. 

·          The process is sometimes known as de-modulation (reverse of modulation in the transmitter).

3

Audio Amplifier

·          The audio amplifier increases the detected audio signal to level that can be used with a loudspeaker.

4

Loudspeaker

·          Sometimes headphones are used in place of the loudspeaker.