WSJT-X/lib/fsk4hf/wsprcpm_params.f90

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parameter (KK=64) !Information bits (50 + CRC14) ?
parameter (ND=200) !Data symbols: LDPC (204,68), r=1/3, don't send last 4 bits
parameter (NS=16) !Sync symbols (16)
parameter (NN=NS+ND) !Total symbols (216)
parameter (NSPS0=6400) !Samples per symbol at 12000 S/s
parameter (NDOWN=32) !Downsample to 200 sa/symbol (375 Hz) for candidate selection
parameter (NSPS=NSPS0/NDOWN) !Samples per symbol
parameter (NZ=NSPS*NN) !Samples in baseband waveform
parameter (NZ0=NSPS0*NN) !Samples in waveform at 12000 S/s
parameter (NFFT1=4*NSPS,NH1=NFFT1/2)