I assumed that people kept using FSK because paths to Europe can have 20-30 Hz of Doppler spread.
73, John KD6OZH ----- Original Message ----- From: KH6TY To: digitalradio@yahoogroups.com Sent: Tuesday, March 09, 2010 19:08 UTC Subject: Re: [digitalradio] Re: 1976 FCC - Delete all Emission Types from Part 97 It is probably all of these things that keeps PSK63 from replacing RTTY for contesting, as well as there being no need for an interface since most transceivers have FSK built in these days. That is my best guess anyway. 73 - Skip KH6TY