SignalPrep
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?

  1. A3,57 mètres
  2. B14,30 mètres
  3. C7,01 mètres
  4. 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.

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