Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-010
Your antenna tuner does not have a balanced output and you wish to use window line to feed an HF antenna. What device should you use between the tuner and the transmission line?
- A Autotransformer
- B Balun
- C Transmission line stub
- D Quarter-wave transformer
Correct answer: B — Balun. From the official ISED question bank, verified word for word.
Why
A Balun is the correct device because it converts the unbalanced signal from your tuner into a balanced signal that window line requires, preventing unwanted current from flowing on the outside of the 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.