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FST4SIM(1) WSJT-X Manual FST4SIM(1) NAME fst4sim, qra64sim - Generate simulated QRA64, FST4, and FST4W mode signals. SYNOPSIS qra64sim msg A-E Nsigs fDop DT Nfiles SNR fst4sim msg TRsec f0 DT h fDop del Nfiles SNR W DESCRIPTION fst4sim can be used to generate FST4 and FST4W signals with user-specified message content, mode parameters, and SNR values. ARGS msg A valid QRA64, FST4, or FST4W message enclosed in quotation marks. A-E QRA64 sub-mode designator. Nsigs Number of signals to simulate, distributed even across a 2000 Hz band- width. TRsec A valid T/R period duration (s). f0 Integer signal frequency offset (Hz). DT Decimal signal time offset (s). h A valid modulation index. fDop Decimal Doppler frequency spread (Hz). del Decimal Watterson model delay (ms). nfiles Number of files to generate. snr Add Guassian noise to simulate SNR in 2500 Hz bandwidth. W Hint to break ties between ambiguous messages 0 as 77-bit (FST4), 1 as 50-bit (FST4W). Generated files are 12000 Hz sample rate, 16-bit unsigned format, mono PCM .WAV files suitable for replay using WSJT-X either vie the GUI wsjtx(1) or using the command line slow mode decoder jt9(1). Files are named 000000_nnnnnn.wav (000000_nnnn.wav for QRA64), where nnnnnn or nnnn incre- ments from zero. AUTHOR Joe Taylor, K1JT. COPYING fcal is Copyright (C) 2001 - 2019 by Joseph H. Taylor, Jr., K1JT, with con- tributions from additional authors. WSJT-X is Open Source software, li- censed under the GNU General Public License (GPLv3). This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FIT- NESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. AsciiDoc 2.7.0-rc7 08/04/2026 FST4SIM(1)
NAME | SYNOPSIS | DESCRIPTION | ARGS | AUTHOR | COPYING
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