Basic Qualification · B-006 Feedlines and antenna systems · B-006-009-011
Une antenne affiche un gain de 4,1 dBi. Quel est son gain par rapport à une antenne dipôle demi-onde?
- A4,1 dB
- B3,0 dB
- C1,1 dB
- D2,0 dB
Correct answer: D — 2,0 dB. Question tirée de la banque officielle d'ISDE.
Why
A gain of 4.1 dBi means the antenna is 4.1 decibels stronger than an isotropic radiator, which radiates equally in all directions. 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