Basic Qualification · B-003 Station assembly, practice and safety · B-003-010-011
Laquelle des bandes passantes suivantes serait optimale pour la réception en CW?
- ADe 750 Hz à 850 Hz
- BDe 2 100 Hz à 2 300 Hz
- CDe 300 Hz à 2 700 Hz
- DDe 100 Hz à 1 100 Hz
Correct answer: A — De 750 Hz à 850 Hz. Question tirée de la banque officielle d'ISDE.
Why
CW signals are Morse code tones, and the human ear hears them best when the tone is around 750 to 850 hertz. 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