Basic Qualification · B-006 Feedlines and antenna systems · B-006-001-010
What factors determine the characteristic impedance of an open-wire transmission line?
- A The distance between the centres of the conductors and the diameter of the conductors
- B The distance between the centres of the conductors and the length of the line
- C The radius of the conductors and the frequency of the signal
- D The frequency of the signal and the length of the line
Correct answer: A — The distance between the centres of the conductors and the diameter of the conductors. From the official ISED question bank, verified word for word.
Why
The characteristic impedance of an open-wire line depends entirely on its physical shape: how far apart the wires sit and how thick they are. 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.