ft8d/ft8_params.f90

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! LDPC (174,91) code
parameter (KK=91) !Information bits (77 + CRC14)
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parameter (ND=58) !Data symbols
parameter (NS=21) !Sync symbols (3 @ Costas 7x7)
parameter (NN=NS+ND) !Total channel symbols (79)
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parameter (NSPS=640) !Samples per symbol at 4000 S/s
parameter (NZ=NSPS*NN) !Samples in full 15 s waveform (50,560)
parameter (NMAX=15*4000) !Samples in iwave (60,000)
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parameter (NFFT1=2*NSPS) !Length of FFTs for symbol spectra
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parameter (NSTEP=NSPS/4) !Rough time-sync step size
parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)
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parameter (NDOWN=20) !Downsample factor
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parameter (MAXCAND=500)