Basic Qualification · B-006 Feedlines and antenna systems · B-006-003-009
Quel type de conducteur extérieur offre le meilleur blindage sur du câble coaxial?
- AUne gaine tressée simple
- BUne double gaine tressée
- CUn blindage rigide
- DUn feuillard d'aluminium
Correct answer: C — Un blindage rigide. Question tirée de la banque officielle d'ISDE.
Why
A solid shield acts like a continuous metal tube around the inner wire, leaving no gaps for radio signals to leak in or out. 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