Basic Qualification · B-003 Station assembly, practice and safety · B-003-010-001
Which series of emission modes listed below is in order from the narrowest bandwidth to the widest bandwidth?
- A FM voice, SSB voice and CW
- B SSB voice, CW and FM voice
- C CW, SSB voice and FM voice
- D CW, FM voice and SSB voice
Correct answer: C — CW, SSB voice and FM voice. From the official ISED question bank, verified word for word.
Why
CW, or continuous wave, uses the least space because it sends simple on-off pulses. 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.