Basic Qualification · B-006 Feedlines and antenna systems · B-006-004-002
What is the major advantage of open-wire transmission line?
- A It can be operated at high SWR without excessive loss
- B It can be located near metal objects without problems
- C It has low impedance, which facilitates matching to a transceiver
- D It does not radiate RF energy, which could cause interference to nearby equipment
Correct answer: A — It can be operated at high SWR without excessive loss. From the official ISED question bank, verified word for word.
Why
Open-wire transmission lines, also known as ladder line, use widely spaced conductors that minimize energy loss even when the standing wave ratio (SWR) is very high. 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.