Automatic Link Establishment
, commonly known as ALE
, is the worldwide de facto standard for digitally initiating and
sustaining HF radio
communications. ALE is a feature in an HF communications radio transceiver system, that enables the
radio station to make contact, or initiate a circuit, between itself and another HF radio station or network of stations.
The purpose is to provide a reliable rapid method of calling and connecting during constantly changing HF ionospheric propagation,
reception interference, and shared spectrum use of busy or congested HF channels.
The Official Home of HF ALC
Automatic Link Establishment on Wikipedia