Basic Qualification · B-003 Station assembly, practice and safety · B-003-006-009
In a single-sideband transmitter, which stage transposes the voice message from the audio spectrum to the radio spectrum?
- A Variable frequency oscillator
- B Fixed RF oscillator
- C Balanced modulator
- D Mixer
Correct answer: C — Balanced modulator. From the official ISED question bank, verified word for word.
Why
The balanced modulator is the stage that takes your voice signal and shifts it up from the audio range into the radio frequency range, which is essential for single-sideband transmission. 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.