http://hflink.com/alehamradio/
http://www.n2ckh.com/PC_ALE_FORUM/
https://ion2g.app/
https://www.sigidwiki.com/wiki/Automatic_Link_Establishment_(2G_ALE)
http://www.hflink.com/garec/garec2007/index_files/v3_document.htm