Plain-language answer: Automatic level control limits transmitter drive to keep output within the radio’s intended operating range.
Why operators care
On digital modes, excessive audio can drive ALC hard, flatten the waveform, and create splatter. Some radios permit a small ALC indication; others recommend none.
Set it up correctly
Follow the radio manual, set RF power first, raise interface audio gradually, and verify clean output with the radio’s meter and an independent receiver or analyzer.
The common mistake
Using the ALC meter as a target to maximize instead of a limit to respect.
Operating boundary
Current regulations, service documentation, satellite status, software versions, and the complete station’s continuous-duty limits control. Online reports are observations, not guaranteed link performance.
