mirror of https://github.com/pavel-demin/ft8d.git
set sample rate to 4000
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e9551b7f10
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@ -12,7 +12,7 @@ subroutine baseline(s,nfa,nfb,sbase)
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real*8 x(1000),y(1000),a(5)
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real*8 x(1000),y(1000),a(5)
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data nseg/10/,npct/10/
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data nseg/10/,npct/10/
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df=6000.0/NFFT1 !3.125 Hz
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df=4000.0/NFFT1 !3.125 Hz
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ia=max(1,nint(nfa/df))
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ia=max(1,nint(nfa/df))
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ib=nint(nfb/df)
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ib=nint(nfb/df)
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do i=ia,ib
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do i=ia,ib
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@ -2,8 +2,8 @@ subroutine ft8_downsample(dd,newdat,f0,c1)
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! Downconvert to complex data sampled at 200 Hz ==> 32 samples/symbol
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! Downconvert to complex data sampled at 200 Hz ==> 32 samples/symbol
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parameter (NMAX=15*6000,NSPS=960)
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parameter (NMAX=15*4000,NSPS=640)
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parameter (NFFT1=96000,NFFT2=3200) !96000/30 = 3200
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parameter (NFFT1=64000,NFFT2=3200) !64000/20 = 3200
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logical newdat
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logical newdat
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complex c1(0:NFFT2-1)
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complex c1(0:NFFT2-1)
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@ -20,13 +20,13 @@ subroutine ft8_downsample(dd,newdat,f0,c1)
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newdat=.false.
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newdat=.false.
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endif
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endif
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if(f0.lt.3000.0) then
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if(f0.lt.2000.0) then
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f=f0+3000.0
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f=f0+2000.0
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else
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else
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f=f0-3000.0
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f=f0-2000.0
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endif
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endif
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df=6000.0/NFFT1
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df=4000.0/NFFT1
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baud=6000.0/NSPS
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baud=4000.0/NSPS
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i0=nint(f/df)
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i0=nint(f/df)
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ft=f+8.0*baud
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ft=f+8.0*baud
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it=min(nint(ft/df),NFFT1)
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it=min(nint(ft/df),NFFT1)
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@ -3,10 +3,10 @@ parameter (KK=87) !Information bits (75 + CRC12)
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parameter (ND=58) !Data symbols
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parameter (ND=58) !Data symbols
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parameter (NS=21) !Sync symbols (3 @ Costas 7x7)
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parameter (NS=21) !Sync symbols (3 @ Costas 7x7)
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parameter (NN=NS+ND) !Total channel symbols (79)
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parameter (NN=NS+ND) !Total channel symbols (79)
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parameter (NSPS=960) !Samples per symbol at 6000 S/s
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parameter (NSPS=640) !Samples per symbol at 4000 S/s
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parameter (NZ=NSPS*NN) !Samples in full 15 s waveform (75,840)
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parameter (NZ=NSPS*NN) !Samples in full 15 s waveform (50,560)
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parameter (NMAX=15*6000) !Samples in iwave (90,000)
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parameter (NMAX=15*4000) !Samples in iwave (60,000)
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parameter (NFFT1=2*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
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parameter (NFFT1=2*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
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parameter (NSTEP=NSPS/4) !Rough time-sync step size
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parameter (NSTEP=NSPS/4) !Rough time-sync step size
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parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)
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parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)
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parameter (NDOWN=30) !Downsample factor
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parameter (NDOWN=20) !Downsample factor
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2
ft8b.f90
2
ft8b.f90
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@ -76,7 +76,7 @@ subroutine ft8b(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,lapon,lapcqonly, &
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max_iterations=30
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max_iterations=30
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nharderrors=-1
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nharderrors=-1
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fs2=6000.0/NDOWN
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fs2=4000.0/NDOWN
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dt2=1.0/fs2
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dt2=1.0/fs2
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twopi=8.0*atan(1.0)
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twopi=8.0*atan(1.0)
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delfbest=0.
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delfbest=0.
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12
ft8d.f90
12
ft8d.f90
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@ -25,14 +25,14 @@ program ft8d
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nfiles=nargs
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nfiles=nargs
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twopi=8.0*atan(1.0)
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twopi=8.0*atan(1.0)
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fs=6000.0 !Sample rate
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fs=4000.0 !Sample rate
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dt=1.0/fs !Sample interval (s)
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dt=1.0/fs !Sample interval (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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tt=NSPS*dt !Duration of "itone" symbols (s)
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ts=2*NSPS*dt !Duration of OQPSK symbols (s)
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ts=2*NSPS*dt !Duration of OQPSK symbols (s)
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baud=1.0/tt !Keying rate (baud)
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baud=1.0/tt !Keying rate (baud)
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txt=NZ*dt !Transmission length (s)
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txt=NZ*dt !Transmission length (s)
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nfa=-2000
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nfa=-1600
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nfb=+2000
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nfb=+1600
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nfqso=0
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nfqso=0
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do ifile=1,nfiles
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do ifile=1,nfiles
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@ -62,14 +62,14 @@ program ft8d
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if((ndecodes-n2).eq.0) cycle
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if((ndecodes-n2).eq.0) cycle
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lsubtract=.false.
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lsubtract=.false.
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endif
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endif
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call sync8(dd,nfa+3000,nfb+3000,syncmin,nfqso+3000,s,candidate,ncand,sbase)
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call sync8(dd,nfa+2000,nfb+2000,syncmin,nfqso+2000,s,candidate,ncand,sbase)
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do icand=1,ncand
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do icand=1,ncand
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sync=candidate(3,icand)
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sync=candidate(3,icand)
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f1=candidate(1,icand)
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f1=candidate(1,icand)
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xdt=candidate(2,icand)
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xdt=candidate(2,icand)
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xbase=10.0**(0.1*(sbase(nint(f1/3.125))-40.0))
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xbase=10.0**(0.1*(sbase(nint(f1/3.125))-40.0))
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nsnr0=min(99,nint(10.0*log10(sync) - 25.5)) ! ### empirical ###
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nsnr0=min(99,nint(10.0*log10(sync) - 25.5)) ! ### empirical ###
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call ft8b(dd,newdat,nQSOProgress,nfqso+3000,nftx,ndepth,lft8apon, &
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call ft8b(dd,newdat,nQSOProgress,nfqso+2000,nftx,ndepth,lft8apon, &
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lapcqonly,napwid,lsubtract,nagain,iaptype,mycall12,mygrid6, &
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lapcqonly,napwid,lsubtract,nagain,iaptype,mycall12,mygrid6, &
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hiscall12,bcontest,sync,f1,xdt,xbase,apsym,nharderrors,dmin, &
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hiscall12,bcontest,sync,f1,xdt,xbase,apsym,nharderrors,dmin, &
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nbadcrc,iappass,iera,msg37,xsnr)
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nbadcrc,iappass,iera,msg37,xsnr)
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@ -93,7 +93,7 @@ program ft8d
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endif
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endif
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write(*,1004) nutc,ipass,iaptype,iappass, &
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write(*,1004) nutc,ipass,iaptype,iappass, &
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nharderrors,dmin,hd,min(sync,999.0),nint(xsnr), &
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nharderrors,dmin,hd,min(sync,999.0),nint(xsnr), &
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xdt,nint(f1-3000+dialfreq),message
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xdt,nint(f1-2000+dialfreq),message
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1004 format(i6.6,3i2,i3,3f6.1,i4,f6.2,i9,1x,a22)
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1004 format(i6.6,3i2,i3,3f6.1,i4,f6.2,i9,1x,a22)
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endif
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endif
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enddo
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enddo
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@ -1,18 +1,18 @@
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subroutine genft8refsig(itone,cref,f0)
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subroutine genft8refsig(itone,cref,f0)
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complex cref(79*960)
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complex cref(79*640)
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integer itone(79)
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integer itone(79)
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real*8 twopi,phi,dphi,dt,xnsps
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real*8 twopi,phi,dphi,dt,xnsps
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data twopi/0.d0/
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data twopi/0.d0/
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save twopi
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save twopi
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if( twopi .lt. 0.1 ) twopi=8.d0*atan(1.d0)
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if( twopi .lt. 0.1 ) twopi=8.d0*atan(1.d0)
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xnsps=960.d0
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xnsps=640.d0
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dt=1.d0/6000.d0
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dt=1.d0/4000.d0
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phi=0.d0
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phi=0.d0
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k=1
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k=1
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do i=1,79
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do i=1,79
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dphi=twopi*(f0*dt+itone(i)/xnsps)
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dphi=twopi*(f0*dt+itone(i)/xnsps)
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do is=1,960
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do is=1,640
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cref(k)=cmplx(cos(phi),sin(phi))
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cref(k)=cmplx(cos(phi),sin(phi))
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phi=mod(phi+dphi,twopi)
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phi=mod(phi+dphi,twopi)
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k=k+1
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k=k+1
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@ -9,7 +9,7 @@ subroutine subtractft8(dd,itone,f0,dt)
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use timer_module, only: timer
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use timer_module, only: timer
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parameter (NMAX=15*6000,NFRAME=960*79)
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parameter (NMAX=15*4000,NFRAME=640*79)
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parameter (NFFT=NMAX,NFILT=1400)
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parameter (NFFT=NMAX,NFILT=1400)
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real*4 window(-NFILT/2:NFILT/2)
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real*4 window(-NFILT/2:NFILT/2)
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complex dd(NMAX)
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complex dd(NMAX)
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@ -20,12 +20,12 @@ subroutine subtractft8(dd,itone,f0,dt)
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common/heap8/cref(NFRAME),camp(NMAX),cfilt(NMAX),cw(NMAX)
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common/heap8/cref(NFRAME),camp(NMAX),cfilt(NMAX),cw(NMAX)
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save first
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save first
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if(f0.lt.3000.0) then
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if(f0.lt.2000.0) then
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f=f0+3000.0
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f=f0+2000.0
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else
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else
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f=f0-3000.0
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f=f0-2000.0
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endif
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endif
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nstart=dt*6000+1
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nstart=dt*4000+1
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call genft8refsig(itone,cref,f)
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call genft8refsig(itone,cref,f)
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camp=0.
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camp=0.
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do i=1,nframe
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do i=1,nframe
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@ -22,8 +22,8 @@ subroutine sync8(dd,nfa,nfb,syncmin,nfqso,s,candidate,ncand,sbase)
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! Compute symbol spectra, stepping by NSTEP steps.
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! Compute symbol spectra, stepping by NSTEP steps.
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savg=0.
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savg=0.
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tstep=NSTEP/6000.0
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tstep=NSTEP/4000.0
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df=6000.0/NFFT1 !3.125 Hz
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df=4000.0/NFFT1 !3.125 Hz
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fac=1.0/300.0
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fac=1.0/300.0
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do j=1,NHSYM
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do j=1,NHSYM
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ia=(j-1)*NSTEP + 1
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ia=(j-1)*NSTEP + 1
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@ -2,7 +2,7 @@ subroutine sync8d(cd0,i0,ctwk,itwk,sync)
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! Compute sync power for a complex, downsampled FT8 signal.
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! Compute sync power for a complex, downsampled FT8 signal.
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parameter(NP2=2812,NDOWN=30)
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parameter(NP2=2812,NDOWN=20)
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complex cd0(3125)
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complex cd0(3125)
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complex csync(0:6,32)
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complex csync(0:6,32)
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complex csync2(32)
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complex csync2(32)
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@ -19,7 +19,7 @@ subroutine sync8d(cd0,i0,ctwk,itwk,sync)
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! Set some constants and compute the csync array.
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! Set some constants and compute the csync array.
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if( first ) then
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if( first ) then
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twopi=8.0*atan(1.0)
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twopi=8.0*atan(1.0)
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fs2=6000.0/NDOWN !Sample rate after downsampling
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fs2=4000.0/NDOWN !Sample rate after downsampling
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dt2=1/fs2 !Corresponding sample interval
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dt2=1/fs2 !Corresponding sample interval
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taus=32*dt2 !Symbol duration
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taus=32*dt2 !Symbol duration
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baud=1.0/taus !Keying rate
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baud=1.0/taus !Keying rate
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