Basic Qualification · B-006 Feedlines and antenna systems · B-006-003-010
Si votre emplacement est fréquemment affecté par des conditions de givrage, quel type de ligne de transmission serait le plus approprié?
- ALa ligne bifilaire
- BLe câble coaxial
- CLa ligne ouverte, dite "en échelle"
- DLa ligne bifilaire ajourée ("window line")
Correct answer: B — Le câble coaxial. Question tirée de la banque officielle d'ISDE.
Why
Coaxial cable is the best choice because its outer shield completely encloses the inner conductor, keeping ice and moisture away from the signal path. 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