Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-007
What device can be installed to feed a balanced antenna with an unbalanced transmission line?
- A A balun
- B A triaxial transformer
- C A wave trap
- D A loading coil
Correct answer: A — A balun. From the official ISED question bank, verified word for word.
Why
A balun, short for balanced to unbalanced, is the device designed to connect a balanced antenna, which has two equal sides, to an unbalanced transmission line like coaxial cable, which has one centre conductor and an outer shield. 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.