Basic Qualification · B-003 Station assembly, practice and safety · B-003-003-003
In a superheterodyne receiver, which stage allows detection to function at a single frequency regardless of the received frequency?
- A IF filter
- B Discriminator
- C Mixer
- D Limiter
Correct answer: C — Mixer. From the official ISED question bank, verified word for word.
Why
The Mixer is the stage that shifts any incoming radio signal to a fixed intermediate frequency, allowing the rest of the receiver to process it at that single, unchanging value. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.