Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-008
What modulation method is most closely related to frequency modulation?
- A Multiplex modulation
- B Amplitude modulation
- C Pulse modulation
- D Phase modulation
Correct answer: D — Phase modulation. From the official ISED question bank, verified word for word.
Why
Phase modulation is the correct choice because it changes the timing of the radio wave's peaks, which is a property closely linked to how frequency modulation shifts the wave's speed. 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.