Basic Qualification · B-003 Station assembly, practice and safety · B-003-002-001
What does the microphone produce in an FM transmitter?
- A A radio frequency signal driving the power amplifier
- B An electrical signal driving the speech amplifier
- C An electrical signal driving the oscillator
- D A radio frequency signal driving the speech amplifier
Correct answer: B — An electrical signal driving the speech amplifier. From the official ISED question bank, verified word for word.
Why
A microphone converts sound waves into a weak electrical signal that must be strengthened before it can change the frequency of a radio wave. 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.