Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-003
Quel terme définit la variation de fréquence provoquée par la modulation dans un émetteur FM?
- AÉtalement de spectre
- BDéplacement
- CIndice de modulation
- DExcursion de fréquence
Correct answer: D — Excursion de fréquence. Question tirée de la banque officielle d'ISDE.
Why
In frequency modulation, the carrier wave's frequency moves up and down from its centre point based on the audio signal; this specific amount of movement is called deviation. 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