Basic Qualification · B-006 Feedlines and antenna systems · B-006-013-004
Quelle est la longueur approximative de l'élément alimenté d'une antenne "quad" syntonisée à 14,3 MHz?
- A10,49 mètres
- B16,36 mètres
- C5,35 mètres
- D21,40 mètres
Correct answer: D — 21,40 mètres. Question tirée de la banque officielle d'ISDE.
Why
A quad antenna's driven element is a full wavelength loop, meaning its total wire length equals one complete wave at the operating frequency. 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