Basic Qualification · B-003 Station assembly, practice and safety · B-003-001-006
In an HF station, what device might allow the use of an antenna on a band it was not designed for?
- AAn antenna tuner
- BA low-pass filter
- CA high-pass filter
- DAn SWR meter
Correct answer: A — An antenna tuner. From the official ISED question bank, verified word for word.
Why
An antenna tuner matches the radio's output to the antenna's electrical needs, allowing you to safely transmit on bands the antenna was not originally built for by correcting the impedance mismatch. 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.
Drill B-003 — free, no account