Basic Qualification · B-006 Feedlines and antenna systems · B-006-013-003
Quelle est la longueur approximative de l'élément alimenté d'une antenne "quad" syntonisée à 21,4 MHz?
- A3,57 mètres
- B14,30 mètres
- C7,01 mètres
- D10,93 mètres
Correct answer: B — 14,30 mètres. Question tirée de la banque officielle d'ISDE.
Why
A quad antenna's driven element forms a square loop, so its total wire length must equal one full wavelength. 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