Sensitivities of the wider submodes are degraded by amounts that depend on Doppler spread and other details of the propagation path. Submodes B, C, and D have larger tone spacings and occupied bandwidths by factors of 2, 4, and 8, respectively.
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Submodes are given full names like FST4-60A, where 60 indicates 60-second sequences and A impliesminimum tone spacing. Do not confuse FST4 with FT4 - a digital mode with 7.5 s T/R sequences designed for HF and VHF contesting.The measured sensitivities are based on simulations on the additive white Gaussian noise (AWGN) channel, and depend on oscillatorĭrifts and path Doppler spreads being smaller than the tone spacing over the full transmission length. In all cases, message formatsĭisplayed to the user are the same as in the other 50-bit and 77-bit modes in WSJT-X.īasic parameters of the A submodes are given in the following table. With WSPR-like messages the modeĭesignation becomes FST4W and the A submode is always used. The underlying message payloads contain either 77 bits (the standard payload for FT4, FT8, and MSK144) or 50 bits (the standard for quasi-beacon, WSPR-style messages). Information-carrying symbols (2 bits each) interspersed with 40 synchronizing symbols. Transmissions consist of a sequence of 120
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Forward error correction uses a low density parity check (LDPC) code with 240 information and parity bits. Submodes A, B, C, and D provide different tone spacings, to allow for use with a variety of propagation types and Doppler spreads. Purposes better than older modes in WSJT-X, and without the strict time- and frequency-lockingįST4 uses 4-GFSK modulation and offers T/R sequence lengths of 15, 30, 60, 120, 300, 900, and 1800 We expect that FST4 will serve some of its intended … but other uses will surely be found, as well. ▪ EME on VHF and UHF bands with T/R sequences both shorter and longer than 60 s ▪ QSOs with very weak signals on the LF and MF bands ▪ WSPR-like, quasi-beacon transmissions on LF and MF bands Than most older modes in WSJT-X and are close to the theoretical limits for the same information Their fundamental sensitivities are better Have a wide range of capabilities and potential applications. Version 2.3 of WSJT-X introduces a new family of digital modes we designate FST41 Steve Franke, K9AN Bill Somerville, G4WJS and Joe Taylor, K1JT