Basic Qualification · B-003 Station assembly, practice and safety · B-003-011-006
Morse code is usually transmitted by radio as:
- A a series of key clicks
- B a continuous carrier
- C a phase-shifted carrier
- D an interrupted carrier
Correct answer: D — an interrupted carrier. From the official ISED question bank, verified word for word.
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
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.