On Tue, Jan 19, 2021 at 07:28 PM, Rafael Diniz wrote:

What is the emission type / signal characteristics of this "FT8"?

*FT8* messages are transmitted using 8-tone continuous-phase frequency
shift keying (CPFSK). Each transmitted tone or channel symbol conveys
three bits.

from 
https://physics.princeton.edu/pulsar/k1jt/FT4_FT8_QEX.pdf
<https://physics.princeton.edu/pulsar/k1jt/FT4_FT8_QEX.pdf>

73
Evan
AC9TU