SignalPrep
Basic Qualification · B-006 Feedlines and antenna systems · B-006-011-011

Si le gain d'une antenne Yagi à six éléments est d'environ 10 dBi, quel serait le gain global de deux de ces antennes si elles étaient jumelées ("stacked")?

  1. A13 dBi
  2. B7 dBi
  3. C20 dBi
  4. D10 dBi

Correct answer: A — 13 dBi. Question tirée de la banque officielle d'ISDE.

Why

Stacking two identical antennas doubles the effective power in the desired direction, which adds exactly 3 decibels to the 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

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