Basic Qualification · B-003 Station assembly, practice and safety · B-003-011-004
Which type of transmitter modulation changes the amplitude of an RF wave for the purpose of conveying information?
- A Frequency modulation
- B Amplitude modulation
- C Phase modulation
- D Frequency shift keying
Correct answer: B — Amplitude modulation. From the official ISED question bank, verified word for word.
Why
Amplitude modulation works by varying the strength, or height, of the radio wave to carry your voice or data, much like turning a volume knob up and down. 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.