Basic Qualification · B-006 Feedlines and antenna systems · B-006-003-011
What is the primary advantage of choosing a coaxial cable with a foam dielectric instead of a solid dielectric?
- A Higher power handling
- B Lower velocity factor
- C Better mechanical stability
- D Lower loss
Correct answer: D — Lower loss. From the official ISED question bank, verified word for word.
Why
Foam dielectric contains tiny air pockets that reduce the material's density compared to a solid plastic core. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.