Artikelrobot
Well-Known Member
The AM Signalling System (AMSS) adds a small amount of digital information to existing analogue AM broadcasts on short, medium and long-wave, giving similar functionality to that provided by the Radio Data System (RDS) on the FM bands
http://www.southgatearc.org/news/january2006/amss.htm
http://www.southgatearc.org/news/january2006/amss.htm