Advanced Qualification · A-005 Transmitters, modulation and processing · A-005-007-011
Automatic Level Control (ALC) is another name for:
- A AF clipping
- B RF compression
- C AF compression
- D RF clipping
Correct answer: B — RF compression. From the official ISED question bank, verified word for word.
Why
Automatic Level Control, or ALC, is essentially RF compression because it reduces the strength of the radio frequency signal when it gets too loud, preventing the transmitter from overdriving and distorting the output. The full explanation — and one for every question — is in Pro.
Practise this section
Transmitters, modulation and processing: AM, FM, SSB, keying, speech processing, and the numbers behind occupied bandwidth.