Basic Qualification · B-003 Station assembly, practice and safety · B-003-015-005
Why can dozens of FT8 communications occur simultaneously in the space needed for one single-sideband transmission?
- A Time interleaving of the transmissions
- B Formatting of the messages into packets
- C Message structure with limited contact information
- D Narrow bandwidth of an FT8 signal
Correct answer: D — Narrow bandwidth of an FT8 signal. From the official ISED question bank, verified word for word.
Why
FT8 signals use very little radio spectrum, often less than 50 hertz, whereas a standard single-sideband voice call needs about 2.4 kilohertz. 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.