Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-004
What kind of emission would your FM transmitter produce if its microphone failed to work?
- AAn amplitude-modulated carrier
- BA phase-modulated carrier
- CAn unmodulated carrier
- DA frequency-modulated carrier
Correct answer: C — An unmodulated carrier. From the official ISED question bank, verified word for word.
Why
If the microphone fails, no voice or audio signal reaches the transmitter to change the radio wave, so the device simply sends out a steady tone with no information attached. 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