Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-002
Quel type de ligne de transmission est fait de deux conducteurs tenus côte à côte par un matériau isolant?
- AUn guide d'ondes
- BUne ligne ouverte
- CUne ligne bifilaire ajourée ("window line")
- DUn câble coaxial
Correct answer: C — Une ligne bifilaire ajourée ("window line"). Question tirée de la banque officielle d'ISDE.
Why
Window line fits the description because it uses two parallel wires held apart by a plastic strip with regular gaps, or "windows," that embed the wires in insulation while keeping them side-by-side. 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