Basic Qualification · B-003 Station assembly, practice and safety · B-003-001-009
When using an HF transmitter with a solid-state final amplifier, which station component may need to be adjusted when changing frequency?
- A Antenna tuner
- B Low-pass filter
- C SWR meter
- D Dummy load
Correct answer: A — Antenna tuner. From the official ISED question bank, verified word for word.
Why
An antenna tuner matches the transmitter to the antenna system, and because antennas change how they behave at different frequencies, you must adjust the tuner when you switch bands to keep the signal flowing efficiently. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.