FT4

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FT4
Ft42.png
Frequencies 14.08 MHz,3.575 MHz,7.0475 MHz,10.14 kHz,18.104 MHz,21.14 MHz,24.919 MHz,28.18 MHz,50.318 MHz,144.17 MHz
Frequency Range 10.14 kHz - 144.17 MHz
Mode USB
Modulation GFSK
ACF
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.

Frequencies[edit]

  • 3575 kHzKiloHertz (kHz) 10^3 Hz
  • 7047.5 kHzKiloHertz (kHz) 10^3 Hz
  • 10140 kHzKiloHertz (kHz) 10^3 Hz
  • 14080 kHzKiloHertz (kHz) 10^3 Hz
  • 18104 kHzKiloHertz (kHz) 10^3 Hz
  • 21140 kHzKiloHertz (kHz) 10^3 Hz
  • 24919 kHzKiloHertz (kHz) 10^3 Hz
  • 28180 kHzKiloHertz (kHz) 10^3 Hz
  • 50318 kHzKiloHertz (kHz) 10^3 Hz
  • 144170 kHzKiloHertz (kHz) 10^3 Hz

Decoding Software[edit]

Hobby Level Software
Professional Software

Additional Links[edit]