Advanced Qualification · A-007 Feedlines and matching · A-007-003-010
Une antenne Yagi utilise une adaptation "gamma". La tige "gamma" réglable est connectée :
- Aau centre de l'élément alimenté
- Bau condensateur variable
- Cau conducteur central de la ligne coaxiale
- Dà un point réglable du réflecteur
Correct answer: B — au condensateur variable. Question tirée de la banque officielle d'ISDE.
Why
The adjustable gamma rod connects to the variable capacitor because this capacitor cancels out the extra inductive reactance created by the gamma match, allowing the antenna to resonate properly with the transmitter. 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