Basic Qualification · B-003 Station assembly, practice and safety · B-003-005-010
Dans un récepteur à ondes entretenues (CW) et à bande latérale unique, quel étage pourrait inclure un filtre passe-bande audio?
- AL'amplificateur de fréquence intermédiaire
- BLe filtre de fréquence intermédiaire
- CLe limiteur
- DL'amplificateur audiofréquence
Correct answer: D — L'amplificateur audiofréquence. Question tirée de la banque officielle d'ISDE.
Why
The AF amplifier, which boosts the sound signal after it has been converted from radio frequency, is the stage where an audio band-pass filter sits to shape the final sound you hear. 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