When using an HF transmitter with a solid-state final amplifier, which station component may need to be adjusted when changing frequency?

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

Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.

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