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Frequencies 14.08 MHz
Frequency Range 14.08 MHz - 14.08 MHz
Mode USB
Modulation GFSK
Emission Designator
Bandwidth 83.3 Hz
Location Worldwide
Short Description FT4 is an amateur radio QSO communication protocol.
I/Q Raw Recording
Audio Sample

FT4 is an amateur radio contesting communication protocol developed by Joe Taylor (K1JT) and Steve Franke (K9AN) that is descended from FT8. The specifications for FT4 are available on the Princeton Physics website.

FT4 uses 4-GFSKGaussian Frequency-Shift Keying modulation, transmission takes 4.48s with a 7.5s timing window. GFSKGaussian Frequency-Shift Keying modulation is FSKFrequency-Shift Keying smoothed out with a Gaussian function to maximize power efficiency. FT4 transmissions can be decoded at S/N down to -17.5dB.

Common frequencies include: 7080kHz, 10140kHz, 14080kHz

Decoding Software[edit]

Hobby Level Software
Professional Software

Additional Links[edit]