Basic Qualification · B-006 Feedlines and antenna systems · B-006-002-007
Quel dispositif est utilisé pour relier une ligne de transmission asymétrique à une antenne symétrique?
- AUne bobine de charge
- BUn symétriseur ("balun")
- CUn transformateur triaxial
- DUn piège à onde
Correct answer: B — Un symétriseur ("balun"). Question tirée de la banque officielle d'ISDE.
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
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account