subroutine decoder(ntrSeconds,ndepth,nRxLog,c00) ! Decoder for JT9. parameter (NMAX=1800*12000) !Total sample intervals per 30 minutes parameter (NDMAX=1800*1500) !Sample intervals at 1500 Hz rate parameter (NSMAX=22000) !Max length of saved spectra character*22 msg character*33 line character*80 fmt real*4 ccfred(NSMAX) integer*1 i1SoftSymbols(207) integer*2 id2 integer ii(1) complex c0(NDMAX),c00(NDMAX) common/jt9com/ss0(184,NSMAX),savg(NSMAX),id2(NMAX),nutc0,ndiskdat, & ntr,nfqso,newdat,npts80,nfb,ntol,kin,nsynced,ndecoded common/jt9comB/ss(184,NSMAX),c0 common/tracer/limtrace,lu logical first data first/.true./ save if(first) then limtrace=0 lu=12 open(12,file='timer.out',status='unknown') open(14,file='wsjtx_rx.log',status='unknown',position='append') first=.false. endif call timer('decoder ',0) if(newdat.ne.0) then ss=ss0 c0=c00 nutc=nutc0 npts8=npts80 endif ntrMinutes=ntrSeconds/60 newdat=1 nsynced=0 ndecoded=0 limit=1000 if(ndepth.ge.2) limit=20000 if(ndepth.ge.3) limit=100000 nsps=0 if(ntrMinutes.eq.1) then nsps=6912 df3=1500.0/2048.0 fmt='(i4.4,i4,i5,f6.1,f8.0,f6.1,3x,a22,5x,i6)' else if(ntrMinutes.eq.2) then nsps=15360 df3=1500.0/2048.0 fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22,5x,i6)' else if(ntrMinutes.eq.5) then nsps=40960 df3=1500.0/6144.0 fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22,5x,i6)' else if(ntrMinutes.eq.10) then nsps=82944 df3=1500.0/12288.0 fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22,5x,i6)' else if(ntrMinutes.eq.30) then nsps=252000 df3=1500.0/32768.0 fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22,5x,i6)' endif if(nsps.eq.0) stop 'Error: bad TRperiod' !Better: return an error code### kstep=nsps/2 tstep=kstep/12000.0 call timer('sync9 ',0) call sync9(ss,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipk) ! Get sync, approx freq call timer('sync9 ',1) open(13,file='decoded.txt',status='unknown') rewind 13 if(iand(nRxLog,2).ne.0) rewind 14 if(iand(nRxLog,1).ne.0) then ! Write date and time to lu 14 endif fgood=0. df8=1500.0/(nsps/8) sbest=0. 10 continue ii=maxloc(ccfred(ia:ib)) i=ii(1) + ia - 1 f=(i-1)*df3 if((i.eq.ipk .or. ccfred(i).ge.3.0) .and. abs(f-fgood).gt.10.0*df8) then call timer('spec9 ',0) call spec9(c0,npts8,nsps,f,fpk,xdt,snr,i1SoftSymbols) call timer('spec9 ',1) call timer('decode9 ',0) call decode9(i1SoftSymbols,limit,nlim,msg) call timer('decode9 ',1) sync=ccfred(i) - 2.0 if(sync.lt.0.0) sync=0.0 nsync=sync if(nsync.gt.10) nsync=10 nsnr=nint(snr) drift=0.0 if(ccfred(i).gt.sbest .and. fgood.eq.0.0) then sbest=ccfred(i) write(line,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift if(nsync.gt.0) nsynced=1 endif if(msg.ne.' ') then write(13,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,msg write(14,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,msg,nlim fgood=f nsynced=1 ndecoded=1 endif endif ccfred(i-10:i+10)=0. if(maxval(ccfred(ia:ib)).gt.3.0) go to 10 if(fgood.eq.0.0) then write(13,1020) line write(14,1020) line 1020 format(a33) endif call flush(13) call flush(14) close(13) call timer('decoder ',1) call timer('decoder ',101) return end subroutine decoder