Basic Qualification · B-003 Station assembly, practice and safety · B-003-006-007
Dans un émetteur à bande latérale unique, quel étage permet de régler la fréquence du signal émis?
- AL'oscillateur à fréquence variable
- BLe bloc d'accord d'antenne
- CLe filtre de bande latérale
- DLe modulateur équilibré
Correct answer: A — L'oscillateur à fréquence variable. Question tirée de la banque officielle d'ISDE.
Why
The Variable frequency oscillator sets the base radio wave that gets shifted to your chosen channel, so changing its speed directly moves your final transmit frequency. 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