Basic Qualification · B-006 Feedlines and antenna systems · B-006-001-008
The characteristic impedance of an open-wire transmission line depends, in part, on the diameter of its conductors. What other dimension determines its characteristic impedance?
- A Distance to metal structures
- B Spacing of the conductors
- C Length of the line
- D Height above ground
Correct answer: B — Spacing of the conductors. From the official ISED question bank, verified word for word.
Why
The characteristic impedance of an open-wire line is set by how the wire diameter and the gap between the two wires interact to store electrical energy. 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.