Basic Qualification · B-003 Station assembly, practice and safety · B-003-006-002
In a single-sideband transmitter, why is the speech amplifier needed?
- AMicrophones usually have a low power output
- BTo match the balanced modulator's output impedance
- CThe sideband filter requires a large audio signal to work
- DTo improve signal fidelity
Correct answer: A — Microphones usually have a low power output. From the official ISED question bank, verified word for word.
Why
Microphones capture your voice as very weak electrical signals that are too faint to drive the transmitter's next stages effectively. 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