Episode 5 · The Superheterodyne Receiver · Series 02: RF principles

How does one fixed filter serve every station?

A frame from the draft of episode 5, The Superheterodyne Receiver

Coming soon

Release: Nov 27, 2026
Length: 2:49
Subject: Receivers

What it covers

How a mixer moves a station to one fixed frequency, why that makes the image problem, and how the superheterodyne receiver solves it. With three real voices on real AM broadcast frequencies.

Operate it in the lab: Meet Me at 455

Chapters

0:00One filter for every station?
0:22What does multiplying do?
0:43A station moves as one piece
1:13The image problem
1:43The whole receiver
2:05A real band, a real receiver
2:34Why this design won

Frames from the draft

The Superheterodyne Receiver: One filter for every station? — 01 One filter for every station?

The Superheterodyne Receiver: What does multiplying do? — 02 What does multiplying do?

The Superheterodyne Receiver: A station moves as one piece — 03 A station moves as one piece

The Superheterodyne Receiver: The image problem — 04 The image problem

The Superheterodyne Receiver: The whole receiver — 05 The whole receiver

The Superheterodyne Receiver: A real band, a real receiver — 06 A real band, a real receiver

The Superheterodyne Receiver: Why this design won — 07 Why this design won