Basic Qualification · B-006 Feedlines and antenna systems · B-006-011-005
Quel est un des effets d'allonger la perche ("boom") et d'ajouter des directeurs à une antenne Yagi?
- ALe gain augmente
- BLe rapport avant/arrière augmente
- CLa largeur du faisceau augmente
- DLa puissance admissible augmente
Correct answer: A — Le gain augmente. Question tirée de la banque officielle d'ISDE.
Why
Making a Yagi antenna longer by adding more directors focuses the radio signal into a tighter beam, which makes the signal stronger in that specific direction; this concentration of energy is called gain. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account