Wikipedia states below
Joe Taylor, K1JT, announced on June 29, 2017 the availability of a new mode in the WSJT-X software, FT8.[14] FT8 stands for "Franke-Taylor design, 8-FSK modulation" and was created by Joe Taylor, K1JT and Steve Franke, K9AN. It is described as being designed for "multi-hop Es where signals may be weak and fading, openings may be short, and you want fast completion of reliable, confirmable QSO's".
According to J. Taylor, the important characteristics of FT8 are:
- T/R sequence length: 15 s
- Message length: 75 bits + 12-bit CRC
- FEC code: LDPC(174,87)
- Modulation: 8-FSK, keying rate = tone spacing = 6.25 Hz
- Waveform: Continuous phase, constant envelope
- Occupied bandwidth: 50 Hz
- Synchronization: three 7x7 Costas arrays (start, middle, end of Tx)
- Transmission duration: 79*1920/12000 = 12.64 s
- Decoding threshold: -20 dB (perhaps -24 dB with a priori decoding, TBD)
- Operational behavior: similar to HF usage of JT9, JT65
- Multi-decoder: finds and decodes all FT8 signals in passband
- Auto-sequencing after manual start of QSO I have worked psk31 and jt65 now i am working ft8 i had been away for four years with health issues and depression that is another post for another day. Ft8 that was that strange noise i was hearing i did know what a dx cluster was calling it. So I went on the hunt of software being aatight wad i got a great free from WSJT great work. I enjoy it..
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