On Jun 11, 7:34 am, "Robert11" wrote:
Hello,

Have been seeing more and more lists with frequencies of various sorts
tagged
with being "ALE".

I understand that this signifies Automatic Link Establishment.

Questions:

a. Should I be able to hear these on a normal HF receiver ?

Yes.


b. Are they AM as well as USB ? Or,...?

I believe ssb onnly.


c. Are they digital ?
(sometimes or all the times ?)

Voice and data.


Thanks.

Try googling for Automatic Link Establishment. There are several
excellent descriptions of how it works.