Basic Qualification · B-003 Station assembly, practice and safety · B-003-003-008
In an FM receiver, what is the purpose of the discriminator?
- A Provide most of the receiver's selectivity
- B Recover the original modulation from the carrier
- C Select narrowband or wideband FM reception
- D Remove amplitude modulation from the received signal
Correct answer: B — Recover the original modulation from the carrier. From the official ISED question bank, verified word for word.
Why
The discriminator acts as the final detective in an FM receiver, listening to how the carrier wave's frequency wobbles and translating those changes back into the original sound or data you want to hear. 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.