Basic Qualification · B-003 Station assembly, practice and safety · B-003-012-011
The automatic level control (ALC) in an SSB transmitter:
- A limits the input audio peaks so that the transmitter is not overdriven
- B reduces transmitter audio feedback
- C increases the occupied bandwidth
- D reduces system noise
Correct answer: A — limits the input audio peaks so that the transmitter is not overdriven. From the official ISED question bank, verified word for word.
Why
Automatic level control acts like a volume limiter for your microphone signal, cutting down loud audio spikes before they reach the transmitter. 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.