Basic Qualification · B-003 Station assembly, practice and safety · B-003-015-006

Which of these modes can work at the lowest signal-to-noise ratio as measured in a 2500 Hz bandwidth?

1. A PSK31
2. B RTTY
3. C CW
4. D FT8

Correct answer: D — FT8. From the official ISED question bank, verified word for word.

Why

FT8 works at the lowest signal-to-noise ratio because it uses advanced digital coding and long transmission times to pull signals out of heavy static that would drown out other modes. 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.

Drill B-003 — free, no account · All B-003 questions