Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-002
What kind of transmission line has two wires side-by-side embedded in insulating material?
- A Open-wire line
- B Window line
- C Coaxial cable
- D Waveguide
Correct answer: B — Window line. From the official ISED question bank, verified word for word.
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
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.