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?
- A Separate signals from atmospheric noise
- B Convert electromagnetic waves into electrical currents
- C Protect the receiver from overload
- D Polarize 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
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.