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?
- ADistance to metal structures
- BSpacing of the conductors
- CLength of the line
- DHeight 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
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