ALE
From The RadioReference Wiki
Automatic Link Establishment
Provides HF radios the ability to automatically link using the best frequency.
See the ALE Networks Page for a partial listing of ALE networks and their frequencies in use
See the Signal Identification Wiki - ALE 2G for software and many other related links
A waterfall for this mode can be found here
Questions on this topic can be posted on the SW Data Decoding forum.
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