Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-011
When more than one signal is present, the FM receiver is likely to demodulate only the strongest signal. What is this behaviour called?
- A Surrender effect
- B Capture effect
- C Overpower effect
- D Interference effect
Correct answer: B — Capture effect. From the official ISED question bank, verified word for word.
Why
When two FM signals arrive at once, the receiver locks onto the stronger one and completely ignores the weaker one, much like a person focusing on a loud voice while tuning out a whisper. 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.