Radio Principles

Receiver Block Diagram

The following block diagram is representative of a small portable AM receiver. It is recommended that you print this diagram before reading the next section.

There are several types of receiver, but all work on two base principles. These are the TRF and superheterodyne types. The TRF is popular where the presence of the receiver is not to be easily detected, but the overwhelming majority of receivers and all of those for general consumer use are superheterodyne. In consequence the following diagram is of the latter.