Basic Qualification · B-003 Station assembly, practice and safety · B-003-002-003
An FM transmitter's modulator:
- Aas no effect on the frequency of the oscillator
- Balters the radio's output signal amplitude
- Cproduces amplitude changes in the oscillator
- Daffects the frequency of the oscillator
Correct answer: D — affects the frequency of the oscillator. From the official ISED question bank, verified word for word.
Why
In frequency modulation, the modulator varies the pitch of the carrier wave by directly changing how fast the oscillator vibrates, which is why it affects the frequency of the oscillator. 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