Basic Qualification · B-003 Station assembly, practice and safety · B-003-004-006
In a basic CW transmitter, what does the key do?
- A It switches the transmitted tone on and off
- B It makes and breaks the antenna connection
- C It switches the carrier on and off
- D It switches the carrier between two frequencies
Correct answer: C — It switches the carrier on and off. From the official ISED question bank, verified word for word.
Why
In a basic CW (continuous wave) transmitter, the key acts as a simple switch that turns the radio frequency carrier signal on and off to create the dots and dashes of Morse code. 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.