Plain-language answer: ALE frequency scanning means a receiver cycles through a coordinated channel list, dwelling long enough to detect and decode ALE calls or soundings.
Why it matters
Scan order, dwell time, channel count, and radio tuning speed must align with the calling waveform or calls will be missed.
Put it into practice
Use the common channel plan, verify scan rate and tune time, remove unusable channels, and test calls across the complete list.
The common mistake
Adding many channels without checking whether the scan cycle still meets the calling protocol.
System boundary
Current channel authorization, waveform specifications, radio and tuner manuals, electrical code, exact antenna configuration, and tested interoperability control. A stored match or automation result does not prove radiated efficiency or network readiness.
