Basic Qualification · B-003 Station assembly, practice and safety · B-003-011-006
Le code Morse est généralement transmis sur les ondes sous forme:
- Ad'une porteuse déplacée en phase
- Bd'une porteuse interrompue
- Cd'une série de claquements de manipulation
- Dd'une porteuse continue
Correct answer: B — d'une porteuse interrompue. Question tirée de la banque officielle d'ISDE.
Why
Morse code is sent by turning the radio signal on and off in a pattern of dots and dashes, which means the continuous wave is literally interrupted to create the message. 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