Advanced Qualification · A-007 Feedlines and matching · A-007-003-011
Une antenne Yagi utilise une adaptation "gamma". Le condensateur variable est connecté :
- Aau centre de l'élément alimenté
- Bà la tresse de la ligne coaxiale
- Cà la tige "gamma" réglable
- Dà un point réglable sur le directeur
Correct answer: C — à la tige "gamma" réglable. Question tirée de la banque officielle d'ISDE.
Why
The variable capacitor in a gamma match connects directly to the adjustable gamma rod, which acts as a movable tap point to fine-tune the antenna's impedance. 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