Basic Qualification · B-003 Station assembly, practice and safety · B-003-003-008
In an FM receiver, what is the purpose of the discriminator?
- AProvide most of the receiver's selectivity
- BRecover the original modulation from the carrier
- CSelect narrowband or wideband FM reception
- DRemove 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
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account