Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-007
How is a higher level of the modulating signal represented in an FM signal?
- ABy a larger excursion of the carrier frequency
- BBy a larger amplitude of the carrier
- CBy a larger pulse width in the transmitted wave train
- DBy a larger peak envelope power
Correct answer: A — By a larger excursion of the carrier frequency. From the official ISED question bank, verified word for word.
Why
In frequency modulation, the strength of the incoming audio signal does not change the volume of the radio wave but instead pushes the carrier frequency higher or lower. 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