Basic Qualification · B-006 Feedlines and antenna systems · B-006-011-004
Quelle est la longueur approximative de l'élément réflecteur d'une antenne Yagi syntonisée à 28,1 MHz?
- A2,67 mètres
- B5,34 mètres
- C10,68 mètres
- D2,54 mètres
Correct answer: B — 5,34 mètres. Question tirée de la banque officielle d'ISDE.
Why
A Yagi antenna's reflector is slightly longer than a half-wave dipole, which for 28.1 MHz calculates to roughly 5.18 metres. 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