Basic Qualification · B-003 Station assembly, practice and safety · B-003-009-003
Sur une antenne Yagi à 3 éléments, quel est l'élément rayonnant le plus court?
- ALe réflecteur
- BL'élément alimenté
- CLe directeur
- DLa perche ("boom")
Correct answer: C — Le directeur. Question tirée de la banque officielle d'ISDE.
Why
In a three-element Yagi antenna, the director is the shortest radiating element because it is designed to be slightly shorter than the driven element to help focus the signal forward. 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