Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-004
What is the purpose of a balun?
- A Shunt common-mode current to ground
- B Balance antenna impedance
- C Connect balanced and unbalanced systems
- D Increase antenna gain
Correct answer: C — Connect balanced and unbalanced systems. From the official ISED question bank, verified word for word.
Why
A balun, short for balanced to unbalanced, exists to join two different kinds of circuits: a balanced line like ladder line and an unbalanced line like coaxial cable. 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.