Basic Qualification · B-003 Station assembly, practice and safety · B-003-010-007
Lors de la réception d'un signal modulé, quel est l'effet indésirable d'une bande passante trop étroite au récepteur?
- AUne réduction de l'intensité du signal
- BUn rapport signal sur bruit plus faible
- CUne perte d'information
- DUne réduction de la plage dynamique
Correct answer: C — Une perte d'information. Question tirée de la banque officielle d'ISDE.
Why
If a receiver's bandwidth is set too narrow, it acts like a funnel that is too small to let the entire signal through, cutting off the outer edges where important details of the modulation live. 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