Basic Qualification · B-003 Station assembly, practice and safety · B-003-003-005
In a superheterodyne receiver, which stage rejects signals on adjacent channels?
- AProduct detector
- BIF filter
- CMixer
- DLimiter
Correct answer: B — IF filter. From the official ISED question bank, verified word for word.
Why
The IF filter is the stage that rejects signals on adjacent channels because it sits after the mixer and is designed to pass only the specific intermediate frequency while blocking nearby frequencies. 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