Advanced Qualification · A-007 Feedlines and matching · A-007-003-009
Une antenne Yagi utilise une adaptation "gamma". Le centre de l'élément alimenté est connecté :
- Aau conducteur central de la ligne coaxiale
- Bà la tige "gamma" réglable
- Cau condensateur variable
- Dà la tresse de la ligne coaxiale
Correct answer: D — à la tresse de la ligne coaxiale. Question tirée de la banque officielle d'ISDE.
Why
In a gamma match, the outer shield of your coaxial cable, known as the braid, connects directly to the centre of the driven element, while the inner conductor attaches to the adjustable gamma rod. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.
Drill A-007 — free, no account