| Revision as of 11:17, 2 June 2018 editFabC (talk | contribs)142 edits The protocol needs an his own article and not only to be part of the WSJT-X applications softwareTag: Removed redirect← Previous edit | Revision as of 11:41, 2 June 2018 edit undoOnel5969 (talk | contribs)Autopatrolled, Extended confirmed users, Page movers, New page reviewers, Pending changes reviewers, Rollbackers937,817 edits Reverted to revision 808159761 by Ctill (talk): Restore redirect - no need for a seperate article - all pertinent info is included in target. (TW)Tags: New redirect UndoNext edit → | ||
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| '''FT8''' is an is an ] ] protocol using ] (MFSK). 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 one of the authors, J. Taylor, the important characteristics of FT8 are: | |||
| * Transmit/Receive sequence length: 15 s | |||
| * Message length: 75 bits + 12-bit ] | |||
| * ] code: ](174,87) | |||
| * Modulation: 8-FSK, keying rate = tone spacing = 6.25 Hz | |||
| * Waveform: Continuous phase, constant envelope | |||
| * Occupied bandwidth: 50 Hz | |||
| * Synchronization: three 7x7 ] (start, middle, end of Tx) | |||
| * Transmission duration: 79*1920/12000 = 12.64 s | |||
| * Decoding threshold: -20 dB (perhaps -24 dB with ] decoding, TBD) | |||
| * Operational behavior: similar to ] usage of ], ] | |||
| * Multi-decoder: finds and decodes all FT8 signals in passband | |||
| * Auto-sequencing after manual start of QSO | |||
| Compared to the so called ''slow modes'' (JT9, JT65, QRA64), FT8 is a few dB less sensitive but allows completion of QSOs four times faster. Bandwidth is greater than JT9, but about 1/4 of JT65A and less than 1/2 QRA64. Compared with the ''fast modes'' (JT9E-H), FT8 is significantly more sensitive, has much smaller bandwidth, uses the vertical waterfall, and offers multi-decoding over the full displayed passband. Features not yet implemented include signal subtraction, two-pass decoding, and use of ''a priori'' (already known) information as it accumulates during a QSO."<ref>{{cite web|url=http://physics.princeton.edu/pulsar/K1JT/Release_Notes_1.8.0.txt|title=FT8|author=K1JT}}</ref> | |||
| =History= | |||
| FT8 was created by Joe Taylor, K1JT and Steve Franke, K9AN in mid-2017. Joe Taylor, K1JT, announced on June 29, 2017 the availability of a new mode in the WSJT-X software, FT8.<ref>{{cite web | |||
| |title=FT8 Mode is Latest Bright Shiny Object in Amateur Radio Digital World | |||
| |url=http://www.arrl.org/news/ft8-mode-is-latest-bright-shiny-object-in-amateur-radio-digital-world | |||
| |publisher=] (ARRL) | |||
| |date = 2017-08-01 | |||
| }}</ref> FT8 stands for "Franke-Taylor design, 8-FSK modulation" | |||
| =Application software= | |||
| The following application software packages support the FT8 protocol | |||
| <li> | |||
| ⚫ | |||
| </li> | |||
| =External links= | |||
| * | |||
| {{Digital modes}} | |||
| ] | |||
| ] | |||
Revision as of 11:41, 2 June 2018
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