Basic Qualification · B-003 Station assembly, practice and safety · B-003-001-009
Quand un émetteur HF avec un amplificateur final à semi-conducteurs est utilisé, quel dispositif de la station pourrait devoir être réglé lors de changement de fréquence?
- ALa charge fictive
- BLe bloc d'accord d'antenne
- CLe filtre passe-bas
- DLe ROS-mètre
Correct answer: B — Le bloc d'accord d'antenne. Question tirée de la banque officielle d'ISDE.
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.
Drill B-003 — free, no account