Basic Qualification · B-003 Station assembly, practice and safety · B-003-013-006
Quelle est la largeur de bande approximative d'une émission en modulation de fréquence avec une excursion de fréquence de 5 kHz?
- AMoins de 5 kHz
- BEntre 5 kHz et 10 kHz
- CPlus de 20 kHz
- DEntre 10 kHz et 20 kHz
Correct answer: D — Entre 10 kHz et 20 kHz. Question tirée de la banque officielle d'ISDE.
Why
A frequency modulated signal with 5 kHz deviation spreads its energy across a range wider than the deviation itself because the audio tone also adds to the total width. 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