Basic Qualification · B-006 Feedlines and antenna systems · B-006-001-002
The characteristic impedance of a transmission line is determined by the:
- A physical dimensions and relative positions of the conductors
- B length of the line
- C frequency at which the line is operated
- D load placed at the end of the line
Correct answer: A — physical dimensions and relative positions of the conductors. From the official ISED question bank, verified word for word.
Why
Characteristic impedance is set by how the two wires inside a cable are built, specifically their thickness, the distance between them, and the material separating them. 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.