Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-004
Quel genre d'émission sera produite par votre émetteur FM si le microphone ne fonctionne pas?
- AUne porteuse modulée en fréquence
- BUne porteuse modulée en amplitude
- CUne porteuse modulée en phase
- DUne porteuse non modulée
Correct answer: D — Une porteuse non modulée. Question tirée de la banque officielle d'ISDE.
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