Basic Qualification · B-003 Station assembly, practice and safety · B-003-002-002
Le microphone dans un émetteur FM:
- Aest moins bruyant que les microphones AM ou BLU
- Ba une sonorité différente des autres microphones
- Ca une réponse en fréquence supérieure aux autres microphones
- Dtransforme des vibrations d'air en signal électrique
Correct answer: D — transforme des vibrations d'air en signal électrique. Question tirée de la banque officielle d'ISDE.
Why
A microphone works by turning the sound waves from your voice, which are tiny changes in air pressure, into an electrical signal that the radio can process. 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