Basic Qualification · B-003 Station assembly, practice and safety · B-003-010-001
Quelle série ci-dessous montre des modes d'émissions de la largeur de bande la plus étroite jusqu'à la plus large?
- APhonie BLU, CW et phonie FM
- BCW, phonie BLU et phonie FM
- CCW, phonie FM et phonie BLU
- DPhonie FM, phonie BLU et CW
Correct answer: B — CW, phonie BLU et phonie FM. Question tirée de la banque officielle d'ISDE.
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
Station assembly, practice and safety is section B-003 of the Basic exam: 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