diff --git a/WSJT-X_Users_Guide.docx b/WSJT-X_Users_Guide.docx
index 736e7b8fe..34517ad96 100644
Binary files a/WSJT-X_Users_Guide.docx and b/WSJT-X_Users_Guide.docx differ
diff --git a/lib/decoder.f90 b/lib/decoder.f90
index 4e4d65af5..d1bd5f4dd 100644
--- a/lib/decoder.f90
+++ b/lib/decoder.f90
@@ -11,6 +11,7 @@ subroutine decoder(ss,c0,nstandalone)
   character*20 datetime
   real*4 ccfred(NSMAX)
   real*4 red2(NSMAX)
+  real*4 red3(NSMAX)
   logical ccfok(NSMAX)
   logical done(NSMAX)
   integer*1 i1SoftSymbols(207)
@@ -67,14 +68,18 @@ subroutine decoder(ss,c0,nstandalone)
   lag1=-(2.5/tstep + 0.9999)
   lag2=5.0/tstep + 0.9999
   call timer('sync9   ',0)
-  call sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipk)
+  call sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,red3,ipk)
   call timer('sync9   ',1)
-  red2lim=1.6
-  schklim=2.2
+
+  nsps8=nsps/8
+  df8=1500.0/nsps8
+  dblim=db(864.0/nsps8) - 26.2
 
   do nqd=1,0,-1
      limit=1000
      ccflim=4.0
+     red2lim=1.6
+     schklim=2.2
      if(ndepth.eq.2) then
         limit=10000
         ccflim=3.5
@@ -83,28 +88,25 @@ subroutine decoder(ss,c0,nstandalone)
         limit=100000
         ccflim=2.5
      endif
+     ccfok=.false.
 
      if(nqd.eq.1) then
         limit=100000
-        ccflim=2.0
+        ccfok(ia:ib)=.true.
+!        ccflim=2.0
+!        red2lim=-20.
+!        schklim=1.0
         nfa1=nfqso-ntol
         nfb1=nfqso+ntol
-     else
-        nfa1=nfa
-        nfb1=nfb
-     endif
-
-     ia=max(1,nint((nfa1-1000)/df3))
-     ib=min(NSMAX,nint((nfb1-1000)/df3))
-     ccfok=.false.
-     if(nqd.eq.1) then
-        ccfok(ipk)=.true.
-        do i=ia,ib
-           ccfok(i)=ccfred(i).gt.ccflim .and. red2(i).gt.red2lim
-        enddo
+        ia=max(1,nint((nfa1-1000)/df3))
+        ib=min(NSMAX,nint((nfb1-1000)/df3))
         ia1=ia
         ib1=ib
      else
+        nfa1=nfa
+        nfb1=nfb
+        ia=max(1,nint((nfa1-1000)/df3))
+        ib=min(NSMAX,nint((nfb1-1000)/df3))
         do i=ia,ib
            ccfok(i)=ccfred(i).gt.ccflim .and. red2(i).gt.red2lim
         enddo
@@ -113,9 +115,6 @@ subroutine decoder(ss,c0,nstandalone)
 
      nRxLog=0
      fgood=0.
-     nsps8=nsps/8
-     df8=1500.0/nsps8
-     dblim=db(864.0/nsps8) - 26.2
 
      do i=ia,ib
         f=(i-1)*df3
@@ -145,9 +144,9 @@ subroutine decoder(ss,c0,nstandalone)
               nsnr=nint(snrdb)
               ndrift=nint(drift/df3)
               
-!              write(38,3002) nutc,nqd,nsnr,i,freq,ccfred(i),red2(i),     &
-!                   schk,nlim,msg
-!3002          format(i4.4,i2,i5,i6,f8.1,3f6.1,i9,2x,a22)
+              write(38,3002) nutc,nqd,nsnr,i,freq,ccfred(i),red2(i),     &
+                   red3(i),schk,nlim,msg
+3002          format(i4.4,i2,i4,i5,f7.1,f5.1,f6.1,2f5.1,i8,1x,a22)
 
               if(msg.ne.'                      ') then
                  if(nqd.eq.0) ndecodes0=ndecodes0+1
@@ -168,7 +167,8 @@ subroutine decoder(ss,c0,nstandalone)
                  call flush(6)
               endif
            else
-!              write(38,3002) nutc,nqd,-99,i,freq,ccfred(i),red2(i),schk,0
+              write(38,3002) nutc,nqd,-99,i,freq,ccfred(i),red2(i),red3(i),  &
+                   schk,0
            endif
         endif
      enddo
@@ -186,11 +186,11 @@ subroutine decoder(ss,c0,nstandalone)
   if(nstandalone.eq.0) call timer('decoder ',101)
 
   call system_clock(iclock,iclock_rate,iclock_max)
-!  write(39,3001) nutc,nfreqs1,nfreqs0,ndecodes1,ndecodes0+ndecodes1,       &
-!       float(iclock-iclock0)/iclock_rate
-!3001 format(5i8,f10.3)
-!  call flush(38)
-!  call flush(39)
+  write(39,3001) nutc,nfreqs1,nfreqs0,ndecodes1,ndecodes0+ndecodes1,       &
+       float(iclock-iclock0)/iclock_rate
+3001 format(5i8,f10.3)
+  call flush(38)
+  call flush(39)
 
   return
 end subroutine decoder
diff --git a/lib/fillcom.f90 b/lib/fillcom.f90
index adb76710b..16e45b0fc 100644
--- a/lib/fillcom.f90
+++ b/lib/fillcom.f90
@@ -12,7 +12,7 @@ subroutine fillcom(nutc0,ndepth0)
   npts8=74736
   nfa=1000
   nfb=2000
-  ntol=10
+  ntol=3
   kin=1024
   nzhsym=173
   nsave=0
diff --git a/lib/softsym.f90 b/lib/softsym.f90
index 2981f6f31..c89671e3a 100644
--- a/lib/softsym.f90
+++ b/lib/softsym.f90
@@ -11,8 +11,6 @@ subroutine softsym(c0,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt,freq,drift,   &
   integer*1 i1SoftSymbolsScrambled(207)
   integer*1 i1SoftSymbols(207)
   include 'jt9sync.f90'
-  data freq0/-999.0/,drift0/-999.0/
-  save freq0,drift0
 
   nspsd=16
   ndown=nsps8/nspsd
@@ -28,14 +26,6 @@ subroutine softsym(c0,npts8,nsps8,newdat,fpk,syncpk,snrdb,xdt,freq,drift,   &
   freq=fpk - a(1)
   drift=-2.0*a(2)
 
-  if(abs(freq-freq0).lt.0.1 .and. abs(drift-drift0).lt.0.1) then
-     schk=0.
-     go to 999
-  endif
-  freq0=freq
-  drift0=drift
-  newdat=0
-
   call twkfreq(c3,c5,nz3,fsample,a)   !Correct for deltaF, fDot, fDDot
 
 ! Compute soft symbols (in scrambled order)
diff --git a/lib/sync9.f90 b/lib/sync9.f90
index 8bd3c2958..580cb472e 100644
--- a/lib/sync9.f90
+++ b/lib/sync9.f90
@@ -1,4 +1,4 @@
-subroutine sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipkbest)
+subroutine sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,red3,ipkbest)
 
   parameter (NSMAX=22000)            !Max length of saved spectra
   real ss(184,NSMAX)
@@ -9,6 +9,7 @@ subroutine sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipkbest)
   real smo(-5:25)
   real sq(NSMAX)
   real red2(NSMAX)
+  real red3(NSMAX)
   include 'jt9sync.f90'
 
   ipk=0
@@ -26,19 +27,34 @@ subroutine sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipkbest)
         if(ss1(j).gt.3.0) ss1(j)=3.0
      enddo
 
+     call pctile(ss1,nzhsym,45,sbase)
+     ss1=ss1-sbase
+     sq0=dot_product(ss1(1:nzhsym),ss1(1:nzhsym))
+     rms=sqrt(sq0/(nzhsym-1))
+
      smax=0.
+     smax2=0.
      do lag=lag1,lag2                !DT = 2.5 to 5.0 s
         sum1=0.
+        sq2=sq0
+        nsum=nzhsym
         do j=1,16                    !Sum over 16 sync symbols
            k=ii2(j) + lag
-           if(k.ge.1 .and. k.le.nzhsym) sum1=sum1 + ss1(k)
+           if(k.ge.1 .and. k.le.nzhsym) then
+              sum1=sum1 + ss1(k)
+              sq2=sq2 - ss1(k)*ss1(k)
+              nsum=nsum-1
+           endif
         enddo
         if(sum1.gt.smax) then
            smax=sum1
            ipk=i 
         endif
+        rms=sqrt(sq2/(nsum-1))
+        if(sum1/rms.gt.smax2) smax2=sum1/rms
      enddo
      ccfred(i)=smax                        !Best at this freq, over all lags
+     red3(i)=0.1*smax2 - 1.0
      if(smax.gt.sbest) then
         sbest=smax
         ipkbest=ipk
@@ -48,14 +64,13 @@ subroutine sync9(ss,nzhsym,lag1,lag2,ia,ib,ccfred,red2,ipkbest)
   call pctile(ccfred(ia),ib-ia+1,50,xmed)
   if(xmed.le.0.0) xmed=1.0
   ccfred=2.0*ccfred/xmed 
-!  ccfred=4.0*(ccfred/xmed - 1.0)
 
   savg=0.
   do j=1,nzhsym
      savg(ia:ib)=savg(ia:ib) + ss(j,ia:ib)
   enddo
-  df=1500.0/2048.0                          ! 0.732422
-  df9=12000.0/6912.0                        ! 1.736111
+!  df=1500.0/2048.0                          ! 0.732422
+!  df9=12000.0/6912.0                        ! 1.736111
   savg(ia:ib)=savg(ia:ib)/nzhsym
   smo(0:20)=1.0/21.0
   smo(-5:-1)=-(1.0/21.0)*(21.0/10.0)
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 5a39e3a08..84ede35d4 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1227,7 +1227,7 @@ void MainWindow::decode()                                       //decode()
   jt9com_.nfa=g_pWideGraph->getFmin();
   jt9com_.nfb=g_pWideGraph->getFmax();
 
-  jt9com_.ntol=10;
+  jt9com_.ntol=3;
   if(jt9com_.nutc < m_nutc0) m_RxLog |= 1;  //Date and Time to all65.txt
   m_nutc0=jt9com_.nutc;
   jt9com_.nrxlog=m_RxLog;