It involves a network of radios which transmit a coded signal on each
of a number of frequencies in a list, while listening for signals from
other radios. The idea is to facilitate communication among people who
don't know anything about propagation, by just trying and finding
frequencies that work. It is used by the military and other government
agencies and there is limited use by hams. There is a free piece of
PC software that implements it with ham transceivers; otherwise it may
be built into the radios.

To learn more than you want to know about ALE go to
http://groups/yahoo.com/group/hflink

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jhhaynes at earthlink dot net