Basic Qualification · B-003 Station assembly, practice and safety · B-003-003-007
In an FM receiver, what is the purpose of the limiter?
- A Suppress local oscillator harmonics
- B Prevent overdriving the IF amplifier
- C Maintain constant input level to the mixer
- D Remove amplitude variations from the received signal
Correct answer: D — Remove amplitude variations from the received signal. From the official ISED question bank, verified word for word.
Why
FM signals carry information in frequency changes, not in signal strength, so any sudden bumps in volume are just noise. 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.