Advanced Qualification · A-007 Feedlines and matching · A-007-003-010
A Yagi antenna uses a gamma match. The adjustable gamma rod connects to:
- A the centre of the driven element
- B the variable capacitor
- C the coaxial line centre conductor
- D an adjustable point on the reflector
Correct answer: B — the variable capacitor. From the official ISED question bank, verified word for word.
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 at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.