Basic Qualification · B-006 Feedlines and antenna systems · B-006-001-007
Quel est le principal facteur influençant le facteur de vélocité d'un câble coaxial?
- AL'utilisation d'un blindage rigide ou tressé
- BLe matériau diélectrique
- CLe matériau du conducteur central
- DLa dimension et l'espacement des conducteurs
Correct answer: B — Le matériau diélectrique. Question tirée de la banque officielle d'ISDE.
Why
The speed at which a radio signal travels through a coaxial cable depends mostly on the insulating material, called the dielectric, that sits between the inner wire and the outer shield. 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