The Basic lessons · Station assembly, practice and safety · B-003-003

Inside the Superheterodyne Receiver

This lesson explains how a superheterodyne receiver processes radio signals, detailing the specific job of each stage from the antenna to the speaker. You will learn why certain parts must be quiet, how frequency conversion works, and where volume and noise control happen.

This lesson is part of SignalPrep Pro. The subsection's 10 exam questions are free to practise: practise B-003-003.

What this subsection asks

• In a superheterodyne receiver, which stage is called the front-end?
• In a VHF superheterodyne receiver, which stage must be designed to produce very little noise?
• In a superheterodyne receiver, which stage allows detection to function at a single frequency regardless of the received frequency?
• In a superheterodyne receiver, which stage sets the received frequency?
• In a superheterodyne receiver, which stage rejects signals on adjacent channels?
• In a superheterodyne receiver, which stage provides the final signal power to drive the detector?
• In an FM receiver, what is the purpose of the limiter?
• In an FM receiver, what is the purpose of the discriminator?
• In a receiver, which stage is controlled by the volume control?
• In an FM receiver, which stage includes a squelch circuit?