"Most of the work recently (like last 30 years) has been in very low baud rate systems. From memory, doesn't FT8 run at 5.86 baud? It uses multi channel fsk and

"Most of the work recently (like last 30 years) has been in very low baud rate systems. From memory, doesn't FT8 run at 5.86 baud? It uses multi channel fsk and some FEC weirdness to push a remarkable number of bits per symbol." It also makes communications possible where normal modes just don't work well. For example, six meter (50MHz) band contacts where the signal signal level is extremely weak and the opens very brief.