Advanced Qualification · A-007 Feedlines and matching · A-007-003-008
A Yagi antenna uses a gamma match. The coaxial braid connects to:
- A the variable capacitor
- B the adjustable gamma rod
- C the centre of the reflector
- D the centre of the driven element
Correct answer: D — the centre of the driven element. From the official ISED question bank, verified word for word.
Why
In a Yagi antenna with a gamma match, the coaxial cable's outer shield (braid) connects directly to the centre of the driven element, which is the part of the antenna that actually receives or sends the radio signal. 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.