Basic Qualification · B-003 Station assembly, practice and safety · B-003-004-004
In a basic three-stage CW transmitter, what does the key do?
- A It reduces key chirps
- B It controls the amplitude of the carrier
- C It switches the oscillator on and off
- D It reduces key clicks
Correct answer: B — It controls the amplitude of the carrier. From the official ISED question bank, verified word for word.
Why
In a continuous wave transmitter, the radio wave is always being generated, so the Morse code signal is created by turning that steady wave on and off. 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.