Advanced Qualification · A-007 Feedlines and matching · A-007-003-009
A Yagi antenna uses a gamma match. The centre of the driven element connects to:
- A the adjustable gamma rod
- B a variable capacitor
- C the coaxial line braid
- D the coaxial line centre conductor
Correct answer: C — the coaxial line braid. From the official ISED question bank, verified word for word.
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 at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.