Functioning JTMSK decoder, within stand-alone program msk.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/jtms3@2519 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

jtms3.iss

@@ -1,6 +1,6 @@
 [Setup]
 AppName=JTMS3
-AppVerName=JTMS3 Version 0.2 r2516
+AppVerName=JTMS3 Version 0.2 r2517
 AppCopyright=Copyright (C) 2001-2012 by Joe Taylor, K1JT
 DefaultDirName=c:\JTMS3
 DefaultGroupName=JTMS3

jtms3.pro

@@ -6,10 +6,10 @@
 
 QT       += core gui network
 CONFIG   += qwt thread
-#CONFIG   += console
+CONFIG   += console
 
 TARGET = jtms3
-VERSION = 0.1
+VERSION = 0.2
 TEMPLATE = app
 
 win32 {

libm65/Makefile.MinGW

@@ -17,7 +17,7 @@ CFLAGS = -I. -fbounds-check
 %.o: %.F90
 	${FC} ${FFLAGS} -c $<
 
-all:    libm65.a ms3.exe t1.exe
+all:    libm65.a msk.exe 
 
 OBJS1 = trimlist.o display.o getdphi.o pctile.o ccf65.o \
 	decode1a.o sort.o filbig.o fil6521.o afc65b.o \
@@ -32,15 +32,17 @@ OBJS1 = trimlist.o display.o getdphi.o pctile.o ccf65.o \
 	geocentric.o moon2.o toxyz.o dot.o dcoord.o f77_wisdom.o \
 	gen65.o chkmsg.o ptt.o astrosub.o astro0.o recvpkt.o symspec.o \
 	iqcal.o iqfix.o timf2.o s3avg.o genjtms3.o analytic.o \
-	db.o specjtms.o genmsk.o
+	db.o specjtms.o genmsk.o mskdf.o tweak1.o syncmsk.o \
+	lenmsk.o decodemsk.o ping.o makepings.o alignmsg.o match.o \
+	rtping.o jtmsk.o hipass.o setupmsk.o foldmsk.o 
 
 libm65.a: $(OBJS1)
 	ar cr libm65.a $(OBJS1) 
 	ranlib libm65.a
 
-OBJS3 = ms3.o 
+OBJS3 = msk.o 
-ms3.exe: $(OBJS3) libm65.a
+msk.exe: $(OBJS3) libm65.a
-	$(FC) -o ms3.exe $(OBJS3) libm65.a ../libfftw3f_win.a \
+	$(FC) -o msk.exe $(OBJS3) libm65.a ../libfftw3f_win.a 
 
 OBJS2 = JT65code.o
 JT65code.exe: $(OBJS2) libm65.a

libm65/analytic.f90

@@ -2,9 +2,10 @@ subroutine analytic(d,npts,nfft,s,c)
 
 ! Convert real data to analytic signal
 
+  parameter (NFFTMAX=128*1024)
   real d(npts)
   real s(npts)
-  complex c(npts)
+  complex c(NFFTMAX)
 
   nh=nfft/2
   fac=2.0/nfft

libm65/decodemsk.f90

@@ -0,0 +1,39 @@
+subroutine decodemsk(cdat,npts,cw,i1,nchar,s2,msg)
+
+! DF snd sync have been established, now decode the message
+
+  complex cdat(npts)
+  complex cw(168,0:63)                  !Complex waveforms for codewords
+  real s2(0:63,400)
+  character msg*400
+  complex z,zmax
+  character cc*64
+!                    1         2         3         4         5         6
+!          0123456789012345678901234567890123456789012345678901234567890123
+  data cc/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ./?-                 _     @'/
+
+  msg=' '
+  do j=1,nchar                         !Find best match for each character
+     ia=i1 + (j-1)*168
+     smax=0.
+     do k=0,40
+        kk=k
+        if(k.eq.40) kk=57
+        z=0.
+        do i=1,168
+           z=z + cdat(ia+i)*conjg(cw(i,kk))
+        enddo
+        ss=abs(z)
+        s2(k,j)=ss
+        if(ss.gt.smax) then
+           smax=ss
+           zmax=z
+           kpk=kk
+        endif
+     enddo
+     msg(j:j)=cc(kpk+1:kpk+1)
+     if(kpk.eq.57) msg(j:j)=' '
+  enddo
+
+  return
+end subroutine decodemsk

libm65/foldmsk.f90

@@ -0,0 +1,50 @@
+subroutine foldmsk(s2,msglen,nchar,mycall,msg,msg29)
+
+! Fold the 2-d "goodness of fit" array s2 modulo message length, 
+! then decode the folded message.
+
+  real s2(0:63,400)
+  real fs2(0:63,29)
+  integer nfs2(29)
+  character mycall*12
+  character msg*400,msg29*29
+  character cc*64
+!                    1         2         3         4         5         6
+!          0123456789012345678901234567890123456789012345678901234567890123
+  data cc/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ./?-                 _     @'/
+
+  fs2=0.
+  nfs2=0
+  do j=1,nchar                           !Fold s2 into fs2, modulo msglen
+     jj=mod(j-1,msglen)+1
+     nfs2(jj)=nfs2(jj)+1
+     do i=0,40
+        fs2(i,jj)=fs2(i,jj) + s2(i,j)
+     enddo
+  enddo
+
+  msg=' '
+  do j=1,msglen
+     smax=0.
+     do k=0,40
+        if(fs2(k,j).gt.smax) then
+           smax=fs2(k,j)
+           kpk=k
+        endif
+     enddo
+     if(kpk.eq.40) kpk=57
+     msg(j:j)=cc(kpk+1:kpk+1)
+     if(kpk.eq.57) msg(j:j)=' '
+  enddo
+
+  msg29=msg(1:msglen)
+
+  call alignmsg('  ',2,msg29,msglen,idone)
+  if(idone.eq.0) call alignmsg('CQ',  3,msg29,msglen,idone)
+  if(idone.eq.0) call alignmsg('QRZ', 3,msg29,msglen,idone)
+  if(idone.eq.0) call alignmsg(mycall,4,msg29,msglen,idone)
+  if(idone.eq.0) call alignmsg(' ',   1,msg29,msglen,idone)
+  msg29=adjustl(msg29)
+
+  return
+end subroutine foldmsk

libm65/genmsk.f90

@@ -65,7 +65,6 @@ subroutine genmsk(msg28,iwave,nwave)
   f0=48000.d0/nsps
   dfgen=0.5d0*f0
   foffset=1500.d0 - f0
-  print*,f0,dfgen,foffset
   t=0.d0
   k=0
   phi=0.d0
@@ -95,5 +94,9 @@ subroutine genmsk(msg28,iwave,nwave)
   if(isrch.eq.0) iwave(k+1:)=0
   nwave=k
 
+!  call makepings(iwave,nwave)
+!  write(71) iwave
+!  call flush(71)
+
   return
 end subroutine genmsk

libm65/jtmsk.f90

@@ -0,0 +1,86 @@
+subroutine jtmsk(dat,npts,cfile6,t2,mswidth,ndb,nrpt,Nfreeze,       &
+     ntol,MouseDF,pick)
+
+! Decode a JTMS ping
+
+  parameter (NZ=30*48000)
+  real dat(npts)                        !Raw data
+  complex cdat(NZ)                      !Analytic form of signal
+  character*6 cfile6                    !FileID
+  logical pick
+  character*12 mycall,hiscall
+  real s(NZ)                            !Power spectrum
+  real s2(0:63,400)
+  real r(60000)
+  complex cw(168,0:63)                   !Complex waveforms for all codewords
+  complex cwb(168)                       !Complex waveform for <space>
+  logical first
+  character msg*400,msg29*29
+  character*90 line
+  common/ccom/nline,tping(100),line(100)
+  data first/.true./
+  save first,cw,cwb
+  save cdat                             !Fix its address, for four2
+
+  if(first) call setupmsk(cw,cwb)       !Calculate waveforms for codewords
+  first=.false.
+
+  nsps=24                               !Samples per symbol
+  f0=1000.0                             !Nominal frequency for bit=0
+  n=log(float(npts))/log(2.0) + 1.0
+  nfft1=2**n                            !FFT length
+  call analytic(dat,npts,nfft1,s,cdat)  !Convert to analytic signal
+
+  call mskdf(cdat,npts,t2,nfft1,f0,nfreeze,mousedf,ntol,     &
+       dfx,snrsq2)                      !Get DF
+  print*,'b',dfx,snrsq2
+  sq2lim=7.0
+  if(pick) sq2lim=5.0
+  if(snrsq2.lt.sq2lim) go to 900           !Reject non-JTMS signals
+
+  call tweak1(cdat,npts,-dfx,cdat)      !Mix to standard frequency
+
+! DF is known, now establish character sync.
+
+  call syncmsk(cdat,npts,cwb,r,i1)       !Get character sync
+
+  call lenmsk(r,npts,msglen)             !Find message length
+  
+  s2=0.
+  nchar=(npts-168+1-i1)/168
+  if(nchar.gt.400) nchar=400
+
+  call decodemsk(cdat,npts,cw,i1,nchar,s2,msg)   !Decode the message
+  print*,'B',i1,msglen,nchar
+  print*,msg(1:nchar)
+
+!  ia=1
+!  if(nchar.ge.40) ia=min(nchar/3,nchar-28)    
+!  ib=min(ia+28,nchar)                   !Can better limits ia, ib be found?
+!  print*,'A',ia,ib,nchar
+!  print*,msg(1:nchar)
+!  msg29=adjustl(msg(ia:ib))
+  msg=adjustl(msg)
+  ib=min(nchar,45)
+  ndf=nint(dfx)
+  nchk=max(20,nint(1.5*msglen))
+
+  if(msglen.eq.0 .or. nchar.lt.nchk .or. pick) then
+     if(nline.le.99) nline=nline+1
+     tping(nline)=t2
+     write(line(nline),1110) cfile6,t2,mswidth,ndb,nrpt,ndf,msg(1:45)
+1110 format(a6,f5.1,i5,i3,1x,i2.2,i5,5x,a45)
+  endif
+
+  if(msglen.gt.0 .and. nchar.ge.nchk) then
+     call foldmsk(s2,msglen,nchar,mycall,msg,msg29)   !Decode folded message
+     if(nline.le.99) nline=nline+1
+     tping(nline)=t2
+     write(line(nline),1120) cfile6,t2,mswidth,ndb,nrpt,ndf,msg29
+1120 format(a6,f5.1,i5,i3,1x,i2.2,i5,5x,a29,11x,'*')
+   endif
+
+900 continue
+
+  return
+end subroutine jtmsk

libm65/lenmsk.f90

@@ -0,0 +1,56 @@
+subroutine lenmsk(r,npts,msglen)
+
+! Determine length of the user message in a JTMS ping.
+
+  real r(60000)
+  real acf(4872)
+  integer np(9)
+  data np/5,7,9,11,13,17,19,23,29/      !Permissible message lengths
+  save acf                              !Why necessary?  (But don't remove!)
+
+  msglen=0                              !Use ACF to find msg length
+  if(npts.ge.8*168) then
+     r=r-sum(r(1:npts))/npts
+     acfmax=0.
+     acf0=dot_product(r(1:npts),r(1:npts))
+     kz=min(nint(0.75*npts),29*168)
+     do k=8,kz
+        fac=float(npts)/(npts-k)
+        acf(k)=fac*dot_product(r(1:npts),r(1+k:npts+k))/acf0
+     enddo
+     call hipass(acf(8),kz-7,50)
+
+     do k=8,kz                          !Find acfmax, kpk
+        if(acf(k).gt.acfmax) then
+           acfmax=acf(k)
+           kpk=k
+        endif
+     enddo
+
+     sumsq=0.
+     n=0
+     do k=8,kz                          !Find rms, skipping around kpk
+        if(abs(k-kpk).gt.10) then
+           sumsq=sumsq+acf(k)**2
+           n=n+1
+        endif
+     enddo
+     rms=sqrt(sumsq/n)
+     acf=acf/rms                        !Normalize the acf
+
+     amax2=0.
+     acflim=3.5
+     do i=1,9
+        k=168*np(i)                     !Check only the permitted lengths
+        if(k.gt.kz) go to 10
+        if(acf(k).gt.acflim .and. acf(k).gt.amax2) then  
+           amax2=acf(k)                 !Save best value >3.5 sigma
+           msglen=np(i)                 !Save message length
+           kpk2=k
+        endif
+     enddo
+10   continue
+  endif
+
+  return
+end subroutine lenmsk

libm65/msk.f90

@@ -0,0 +1,59 @@
+program msk
+
+! Starting code for a JTMSK decoder.
+
+  parameter (NSMAX=30*48000)
+  character*80 infile
+  character*6 cfile6
+  character*12 arg
+  real dat(NSMAX)
+  real x(NSMAX)
+  complex cx(0:NSMAX/2)
+  integer hdr(11)
+  integer*2 id
+  common/mscom/id(NSMAX),s1(215,703),s2(215,703)
+
+  nargs=iargc()
+  if(nargs.lt.1) then
+     print*,'Usage: msk <snr>'
+     go to 999
+  endif
+  call getarg(1,arg)
+  read(arg,*) snr
+
+  open(71,file='dat.71',form='unformatted',status='old')
+  read(71) id
+  cfile6='123400'
+
+  npts=30*48000
+  kstep=2048
+  minsigdb=6
+  mousedf=0
+  ntol=200 
+
+  call random_number(x)
+  nfft=NSMAX
+  call four2a(x,nfft,1,-1,0)
+  df=48000.0/nfft
+  ia=nint(300.0/df)
+  ib=nint(2800.0/df)
+  cx(:ia)=0.
+  cx(ib:)=0.
+  call four2a(cx,nfft,1,1,-1)
+  x(1)=0.
+  sq=0.
+  do i=1,NSMAX
+     sq=sq + x(i)**2
+  enddo
+  rms=sqrt(sq/NSMAX)
+  x=x/rms
+  sig=(10.0**(0.05*snr))/32768.0
+  dat=sig*id + x
+
+  k=0
+  do iblk=1,npts/kstep
+     k=k+kstep
+     call rtping(dat,k,cfile6,MinSigdB,MouseDF,ntol)
+  enddo
+
+999 end program msk

libm65/msk0.f90

@@ -0,0 +1,49 @@
+program msk
+
+! Starting code for a JTMSK decoder.
+
+  parameter (NSMAX=30*48000)
+  character*80 infile
+  character*6 cfile6
+  real dat(NSMAX)
+  integer hdr(11)
+  integer*2 id
+  common/mscom/id(NSMAX),s1(215,703),s2(215,703)
+
+  nargs=iargc()
+  if(nargs.lt.1) then
+     print*,'Usage: msk file1 [file2 ...]'
+     print*,'       Reads data from *.wav files.'
+     go to 999
+  endif
+
+  npts=30*48000
+  kstep=2048
+  minsigdb=6
+  mousedf=0
+  ntol=200 
+
+  do ifile=1,nargs
+     call getarg(ifile,infile)
+     open(10,file=infile,access='stream',status='old',err=998)
+     read(10) hdr
+     read(10) id
+     close(10)
+     hdr(1)=hdr(2)
+     i1=index(infile,'.wav')
+     cfile6=infile(i1-6:i1-1)
+     dat=id
+
+     k=0
+     do iblk=1,npts/kstep
+        k=k+kstep
+        call rtping(dat,k,cfile6,MinSigdB,MouseDF,ntol)
+     enddo
+  enddo
+
+  go to 999
+
+998 print*,'Cannot open file:'
+  print*,infile
+
+999 end program msk

libm65/mskdf.f90

@@ -0,0 +1,75 @@
+subroutine mskdf(cdat,npts,t2,nfft1,f0,nfreeze,mousedf,ntol,dfx,snrsq2)
+
+! Determine DF for a JTMS signal.  Also find ferr, a measure of
+! frequency differerence between 1st and 2nd harmonic.  
+! (Should be 0.000)
+
+  parameter (NZ=128*1024)
+  complex cdat(npts)
+  integer ntol
+  real sq(NZ)
+  real ccf(-2600:2600)                  !Correct limits?
+  real tmp(NZ)
+  complex c(NZ)
+  data nsps/8/
+  save c
+
+  df1=48000.0/nfft1
+  nh=nfft1/2
+  fac=1.0/(nfft1**2)
+
+  do i=1,npts
+     c(i)=fac*cdat(i)**2
+  enddo
+  c(npts+1:nfft1)=0.
+  call four2a(c,nfft1,1,-1,1)
+
+! In the "doubled-frequencies" spectrum of squared cdat:
+  fa=2.0*(f0-400)
+  fb=2.0*(f0+400)
+  j0=nint(2.0*f0/df1)
+  ja=nint(fa/df1)
+  jb=nint(fb/df1)
+  jd=nfft1/nsps
+
+  do j=1,nh+1
+     sq(j)=real(c(j))**2 + aimag(c(j))**2
+!     if(j*df1.lt.6000.0) write(54,3009) j*df1,sq(j),db(sq(j))
+!3009 format(3f12.3)
+  enddo
+
+  ccf=0.
+  do j=ja,jb
+     ccf(j-j0-1)=sq(j)+sq(j+jd)
+  enddo
+
+  call pctile(ccf(ja-j0-1),tmp,jb-ja+1,50,base)
+  ccf=ccf/base
+
+  if(NFreeze.gt.0) then
+     fa=2.0*(f0+MouseDF-ntol)
+     fb=2.0*(f0+MouseDF+ntol)
+  endif  
+  ja=nint(fa/df1)
+  jb=nint(fb/df1)
+
+!  rewind 51
+  smax=0.
+  do j=ja,jb
+     k=j-j0-1
+     if(ccf(k).gt.smax) then
+        smax=ccf(k)
+        jpk=j
+     endif
+     f=0.5*k*df1
+!     write(51,3002) f,ccf(k)
+!3002 format(2f12.3)
+  enddo
+!  call flush(51)
+
+  fpk=(jpk-1)*df1  
+  dfx=0.5*fpk-f0
+  snrsq2=smax
+
+  return
+end subroutine mskdf

libm65/ping.f90

@@ -0,0 +1,42 @@
+subroutine ping(s,nz,dtbuf,slim,wmin,pingdat,nping)
+
+! Detect pings and make note of their start time, duration, and peak strength.
+
+  real*4 s(nz)
+  real*4 pingdat(3,100)
+  logical inside
+
+  nping=0
+  peak=0.
+  inside=.false.
+  snrlim=10.0**(0.1*slim) - 1.0
+  sdown=10.0*log10(0.25*snrlim+1.0)
+
+  i0=0                                 !Silence compiler warnings.
+  tstart=0.0
+  do i=2,nz
+     if(s(i).ge.slim .and. .not.inside) then
+        i0=i
+        tstart=i0*dtbuf
+        inside=.true.
+        peak=0.
+     endif
+     if(inside .and. s(i).gt.peak) then
+        peak=s(i)
+     endif
+     if(inside .and. (s(i).lt.sdown .or. i.eq.nz)) then
+        if(i.gt.i0) then
+           if(dtbuf*(i-i0).ge.wmin) then
+              if(nping.le.99) nping=nping+1
+              pingdat(1,nping)=tstart
+              pingdat(2,nping)=dtbuf*(i-i0)
+              pingdat(3,nping)=peak
+           endif
+           inside=.false.
+           peak=0.
+        endif
+     endif
+  enddo
+
+  return
+end subroutine ping

libm65/rtping.f90

@@ -0,0 +1,103 @@
+subroutine rtping(dat,k,cfile6,MinSigdB,MouseDF,ntol)
+
+!subroutine rtping(dat,jz,nz,MinSigdB,MinWidth,NFreeze,DFTolerance,    &
+!     MouseDF,istart,pick,cfile6,mycall,hiscall,mode,ps0)
+
+! Decode Multi-Tone FSK441 mesages.
+
+  parameter (NSMAX=30*48000)
+  parameter (NZMAX=NSMAX/2048)
+  real dat(NSMAX)                !Raw audio data
+  logical pick
+  character*6 cfile6
+  real sig(NZMAX)                !Sq-law detected signal, sampled at 43 ms
+  real sigdb(NZMAX)              !Signal in dB, sampled at 43 ms
+  real work(NZMAX)
+  real pingdat(3,100)
+!  character msg*40,msg3*3
+  character*90 line
+  common/ccom/nline,tping(100),line(100)
+  data nping0/0/
+  save
+
+  slim=MinSigdB
+!  nf1=-ntol
+!  nf2=ntol
+  dt=1.0/48000.0
+  kstep=2048
+!  pick=.false.
+  istart=1
+  jz=k
+
+! Find signal power
+  j=k/kstep
+  sig(j)=dot_product(dat(k-kstep+1:k),dat(k-kstep+1:k))/kstep
+  if(j.lt.10) return
+
+! Remove baseline, compute signal level in dB 
+  call pctile (sig,work,j,50,base1)
+  do i=1,j
+     sigdb(i)=db(sig(i)/base1)
+     if(j.eq.703) write(13,3001) i,sig(i),sigdb(i)
+3001 format(i5,2e12.3)
+  enddo
+
+  dtbuf=kstep*dt
+  wmin=0.040
+  call ping(sigdb,j,dtbuf,slim,wmin,pingdat,nping)
+
+! If this is a "mouse pick" and no ping was found, force a pseudo-ping 
+! at center of data.
+!  if(pick.and.nping.eq.0) then
+!     if(nping.le.99) nping=nping+1
+!     pingdat(1,nping)=0.5*jz*dt
+!     pingdat(2,nping)=0.16
+!     pingdat(3,nping)=1.0
+!  endif
+
+  do iping=1,nping
+! Find starting place and length of data to be analyzed:
+     tstart=pingdat(1,iping)
+     width=pingdat(2,iping)
+     peak=pingdat(3,iping)
+!     mswidth=10*nint(100.0*width)
+     jj=(tstart-0.02)/dt
+     if(jj.lt.1) jj=1
+     jjz=nint((width+0.02)/dt)+1
+     jjz=min(jjz,jz+1-jj)
+
+! Compute average spectrum of this ping.
+!     call spec441(dat(jj),jjz,ps,f0)
+
+! Decode the message.
+!     msg=' '
+!     call longx(dat(jj),jjz,ps,DFTolerance,noffset,msg,msglen,bauderr)
+
+! Assemble a signal report:
+     nwidth=0
+     if(width.ge.0.04) nwidth=1     !These might depend on NSPD
+     if(width.ge.0.12) nwidth=2
+     if(width.gt.1.00) nwidth=3
+     nstrength=6
+     if(peak.ge.11.0) nstrength=7
+     if(peak.ge.17.0) nstrength=8
+     if(peak.ge.23.0) nstrength=9
+!     nrpt=10*nwidth + nstrength
+     t2=tstart + dt*(istart-1)
+
+     jjzz=min(jjz,2*48000)       !Max data size 2 s 
+!###
+     jjzz=14400
+     jj=jj-200
+!###
+
+     if(nping.gt.nping0) then
+        print*,'a',jj,jjzz,jj*dt,jjzz*dt,t2,width
+        call jtmsk(dat(jj),jjzz,cfile6,t2,mswidth,int(peak),nrpt,      &
+             nfreeze,DFTolerance,MouseDF,pick)
+        nping0=nping
+     endif
+  enddo
+
+  return
+end subroutine rtping

libm65/setupmsk.f90

@@ -0,0 +1,51 @@
+subroutine setupmsk(cw,cwb)
+
+! Calculate the JTMS character waveforms.
+
+  complex cw(168,0:63)
+  complex cwb(168)
+  integer nb(7)
+!  real*8 twopi,dt,f0,f1
+  character cc*64
+!                   1         2         3         4         5         6
+!          0123456789012345678901234567890123456789012345678901234567890123
+  data cc/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ./?-                 _     @'/
+
+  nsps=24
+  twopi=8.d0*atan(1.d0)
+  dt=1.d0/48000.d0                     !Sample interval
+  f0=1000.d0
+  f1=2000.d0
+  dphi0=twopi*dt*f0
+  dphi1=twopi*dt*f1
+
+  do i=0,63
+     k=0
+     m=0
+     do n=5,0,-1                          !Each character gets 6+1 bits
+        k=k+1
+        nb(k)=iand(1,ishft(i,-n))
+        m=m+nb(k)
+     enddo
+     k=k+1
+     nb(k)=iand(m,1)                      !Insert parity bit
+
+     phi=0.
+     j=0
+     do k=1,7                             !Generate the waveform
+        if(nb(k).eq.0) then
+           dphi=dphi0
+        else
+           dphi=dphi1
+        endif
+        do ii=1,nsps
+           j=j+1
+           phi=phi+dphi
+           cw(j,i)=cmplx(cos(phi),sin(phi))
+        enddo
+     enddo
+  enddo
+  cwb=cw(1:168,57)
+
+  return
+end subroutine setupmsk

libm65/syncmsk.f90

@@ -0,0 +1,38 @@
+subroutine syncmsk(cdat,npts,cwb,r,i1)
+
+! Establish character sync within a JTMS ping.
+
+  complex cdat(npts)                    !Analytic signal
+  complex cwb(168)                      !Complex waveform for 'space'
+  real r(60000)
+  real tmp(60000)
+  integer hist(168),hmax(1)
+  complex z
+
+  r=0.
+  jz=npts-168+1
+  do j=1,jz
+     z=0.
+     ss=0.
+     do i=1,168
+        ss=ss + abs(cdat(i+j-1))          !Total power
+        z=z + cdat(i+j-1)*conjg(cwb(i))   !Signal matching <space>
+     enddo
+     r(j)=abs(z)/ss                       !Goodness-of-fit to <space>
+!     write(52,3001) j/168.0,r(j),cdat(j)
+!3001 format(4f12.3)
+  enddo
+
+  ncut=99.0*float(jz-10)/float(jz)
+  call pctile(r,tmp,jz,ncut,rlim)
+  hist=0
+  do j=1,jz
+     k=mod(j-1,168)+1
+     if(r(j).gt.rlim) hist(k)=hist(k)+1
+  enddo
+
+  hmax=maxloc(hist)
+  i1=hmax(1)
+
+  return
+end subroutine syncmsk

mainwindow.cpp

@@ -1309,7 +1309,7 @@ void MainWindow::ba2msg(QByteArray ba, char message[])             //ba2msg()
 {
   bool eom;
   eom=false;
-  for(int i=0;i<22; i++) {
+  for(int i=0;i<28; i++) {
     if((int)ba[i] == 0) eom=true;
     if(eom) {
       message[i]=32;
@@ -1317,7 +1317,7 @@ void MainWindow::ba2msg(QByteArray ba, char message[])             //ba2msg()
       message[i]=ba[i];
     }
   }
-  message[22]=0;
+  message[28]=0;
 }
 
 void MainWindow::on_txFirstCheckBox_stateChanged(int nstate)        //TxFirst