About: http://webisa.webdatacommons.org/449019094

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Packet radio used by hams uses AFSK, as did early dial up modems you talk about, and both are a manner of transmitting a digital signal over an analog channel.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org