FT4
From Signal Identification Wiki
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| 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 contesting communication protocol developed by Joe Taylor (K1JT) and Steve Franke (K9AN) descended from FT8. |
| 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.
Samples[edit]
| Typical FT4 activity on amateur radio band (USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables), about 3 kHzKiloHertz (kHz) 10^3 Hz BW) |
FT4 sample recorded directly from WSJT-X |
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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
