SQ4CEP pisze:
Sam wyszukałem
Brief Description of the FT8 Protocol
————————————-
WSJT-X Version 1.8.0 includes a new mode called FT8, developed by K9AN
and K1JT. The mode name “FT8” stands for “Franke and Taylor, 8-FSK
modulation”. FT8 uses 15-second T/R sequences and provides 50% or
better decoding probability down to -20 dB on an AWGN channel. An
auto-sequencing facility includes an option to respond automatically
to the first decoded reply to your CQ. FT8 QSOs are 4 times faster
than those made with JT65 or JT9. FT8 is an excellent mode for HF
DXing and for situations like multi-hop E_s on 6 meters, where deep
QSB may make fast and reliable completion of QSOs desirable.
Some important characteristics of FT8:
– T/R sequence length: 15 s
– Message length: 75 bits + 12-bit CRC
– FEC code: LDPC(174,87)
– Modulation: 8-FSK, tone spacing 6.25 Hz
– Constant-envelope waveform
– Occupied bandwidth: 50 Hz
– Synchronization: 7×7 Costas arrays at start, middle, and end
– Transmission duration: 79*1920/12000 = 12.64 s
– Decoding threshold: -20 dB, several dB lower with AP decoding
– Multi-decoder finds and decodes all FT8 signals in passband
– Optional auto-sequencing and auto-reply to a CQ response
– Operational behavior similar to JT9, JT65
Sam wyszukałem
Brief Description of the FT8 Protocol
————————————-
WSJT-X Version 1.8.0 includes a new mode called FT8, developed by K9AN
and K1JT. The mode name “FT8” stands for “Franke and Taylor, 8-FSK
modulation”. FT8 uses 15-second T/R sequences and provides 50% or
better decoding probability down to -20 dB on an AWGN channel. An
auto-sequencing facility includes an option to respond automatically
to the first decoded reply to your CQ. FT8 QSOs are 4 times faster
than those made with JT65 or JT9. FT8 is an excellent mode for HF
DXing and for situations like multi-hop E_s on 6 meters, where deep
QSB may make fast and reliable completion of QSOs desirable.
Some important characteristics of FT8:
– T/R sequence length: 15 s
– Message length: 75 bits + 12-bit CRC
– FEC code: LDPC(174,87)
– Modulation: 8-FSK, tone spacing 6.25 Hz
– Constant-envelope waveform
– Occupied bandwidth: 50 Hz
– Synchronization: 7×7 Costas arrays at start, middle, and end
– Transmission duration: 79*1920/12000 = 12.64 s
– Decoding threshold: -20 dB, several dB lower with AP decoding
– Multi-decoder finds and decodes all FT8 signals in passband
– Optional auto-sequencing and auto-reply to a CQ response
– Operational behavior similar to JT9, JT65
Stasiek, czy rozumiesz w ogóle coś z tego, co wkleiłeś?
Mam tu tylko dwa konta, to oraz „Michal Czarkowski sq4ctp”. Inne z podobnym nickiem nie są moje – to nie ja…
Kłamca SP1AP: http://kf-ukf.iq24.pl/default.asp?grupa=163238&temat=479342
„Mnie tu nie ma”:http://kf-ukf.iq24.pl/podglad_posta.asp?id_komentarza=2587677
Stachu SP95094KA: „Moim synem nie jestem - to fakt. Ale w wieku mego wnuka.”
Stachu SP9-5094KA:„Ja na ten przykład jestem muł i ciężko mi jakikolwiek żart zrozumieć. Bo to jednak trza mieć lotny umysł.”
Stachu czyli Srasiek_Reden: „Ja jestem gupek, to nie wiem i nie powiem tym samym”
Stachu czyli Srasiek_Reden: „Moje nasłuchy stacji od pasma 160 metrów po pasmo 70 cm i to wszelkimi możliwymi emisjami emitowane sygnały - to ściema.”
Kłamca SP1AP: http://kf-ukf.iq24.pl/default.asp?grupa=163238&temat=479342
„Mnie tu nie ma”:http://kf-ukf.iq24.pl/podglad_posta.asp?id_komentarza=2587677
Stachu SP95094KA: „Moim synem nie jestem - to fakt. Ale w wieku mego wnuka.”
Stachu SP9-5094KA:„Ja na ten przykład jestem muł i ciężko mi jakikolwiek żart zrozumieć. Bo to jednak trza mieć lotny umysł.”
Stachu czyli Srasiek_Reden: „Ja jestem gupek, to nie wiem i nie powiem tym samym”
Stachu czyli Srasiek_Reden: „Moje nasłuchy stacji od pasma 160 metrów po pasmo 70 cm i to wszelkimi możliwymi emisjami emitowane sygnały - to ściema.”