Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-001
Quel type de ligne de transmission comporte un fil central entouré d'un matériau isolant recouvert d'une gaine conductrice ou d'une tresse métallique?
- AUn guide d'ondes
- BUn câble coaxial
- CUne ligne bifilaire ajourée ("window line")
- DUne ligne ouverte, dite "en échelle"
Correct answer: B — Un câble coaxial. Question tirée de la banque officielle d'ISDE.
Why
Coaxial cable fits the description because it has a single centre wire surrounded by insulation and then enclosed by a metal shield that acts as the second conductor. 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