Basic Qualification · B-003 Station assembly, practice and safety · B-003-003-004
Dans un récepteur superhétérodyne, quel étage détermine la fréquence reçue?
- ALe filtre de fréquence intermédiaire
- BL'oscillateur de battement
- CL'oscillateur local
- DL'amplificateur radiofréquence
Correct answer: C — L'oscillateur local. Question tirée de la banque officielle d'ISDE.
Why
The local oscillator generates a signal that mixes with the incoming radio wave to create a fixed intermediate frequency, effectively deciding which station you hear by tuning to a specific 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