On 26/04/2019 18:51, Deisher, Michael wrote:
FT4 acoustic bandwidth is nearly twice that of FT8.
Hi Mike,
that is not correct. The FT4 signal is one-tone GFSK. At any point in
time there is only one tone with constant amplitude. In this respect the
difference between FT8 and FT4 is that FT8 uses 8 different frequencies
to encode symbols and FT4 uses just 4 different frequencies to encode
symbols.
I am not sure how "acoustic bandwidth" is relevant, whatever that is.
The baseband signal is used to modulate an RF carrier so the resulting
signal is not acoustic.
73
Bill
G4WJS.
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