Basic Qualification · B-003 Station assembly, practice and safety · B-003-005-001
In an SSB/CW receiver, what is the purpose of the antenna?
- ASeparate signals from atmospheric noise
- BConvert electromagnetic waves into electrical currents
- CProtect the receiver from overload
- DPolarize signals received via sky-wave propagation
Correct answer: B — Convert electromagnetic waves into electrical currents. From the official ISED question bank, verified word for word.
Why
An antenna acts as the essential first step in any radio receiver by catching invisible radio waves traveling through the air and turning them into tiny electrical currents that the rest of the circuit can process. 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