Basic Qualification · B-006 Feedlines and antenna systems · B-006-007-008
Lorsqu'une station mobile utilise une antenne verticale pour émettre des signaux VHF, la réception de ces signaux sera meilleure avec:
- Aune antenne horizontale à plan de sol
- Bune antenne dipôle horizontale
- Cune antenne verticale à plan de sol
- Dune longueur quelconque de fil
Correct answer: C — une antenne verticale à plan de sol. Question tirée de la banque officielle d'ISDE.
Why
A vertical ground-plane antenna matches the vertical whip on your mobile station because both radiate signals with the same polarization, meaning the electric field points up and down. 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