fst4sim, qra64sim - Generate simulated QRA64, FST4, and FST4W mode signals.

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 bandwidth.

       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 Gaussian 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 increments from zero.

       Joe Taylor, K1JT.

fcal is Copyright © 2001 - 2019 by Joseph H. Taylor, Jr., K1JT, with contributions from additional
       authors. WSJT-X is Open Source software, licensed 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 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
       License for more details.

AsciiDoc 2.7.0                                     02/18/2025                                         FST4SIM(1)

fst4sim can be used to generate FST4 and FST4W signals with user-specified message content, mode
       parameters, and SNR values.

       fst4sim, qra64sim - Generate simulated QRA64, FST4, and FST4W mode signals.

qra64sim msg A-E Nsigs fDop DT Nfiles SNR

       fst4sim msg TRsec f0 DT h fDop del Nfiles SNR W