diff --git a/lib/decoder.f90 b/lib/decoder.f90
index 6499ac673..3c5aad72b 100644
--- a/lib/decoder.f90
+++ b/lib/decoder.f90
@@ -200,6 +200,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
 
   if(params%nmode.eq.66) then        !NB: JT65 = 65, Q65 = 66.
 ! We're in Q65 mode
+     open(17,file=trim(temp_dir)//'/red.dat',status='unknown')
      call timer('dec_q65 ',0)
      call my_q65%decode(q65_decoded,id2,params%nutc,params%ntr,        &
           params%nsubmode,params%nfqso,params%ntol,params%ndepth,      &
diff --git a/lib/q65_sync.f90 b/lib/q65_sync.f90
index 2d042802d..8e5481d73 100644
--- a/lib/q65_sync.f90
+++ b/lib/q65_sync.f90
@@ -151,11 +151,12 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
         f0=nfqso + (ipk-1)*df
         xdt=jpk*dtstep
         imsg_best=imsg
+        ccf1=ccf(-ia:ia,jpk)
      endif
   enddo  ! imsg
 
-  ia=i0+ipk-64
-  ib=ia+LL-1
+  i1=i0+ipk-64
+  i2=i1+LL-1
   j=j0+jpk-7
   n=0
   do k=1,85
@@ -164,7 +165,7 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
         cycle
      endif
      n=n+1
-     if(j.ge.1 .and. j.le.jz) s3(-64:LL-65,n)=s1(ia:ib,j)
+     if(j.ge.1 .and. j.le.jz) s3(-64:LL-65,n)=s1(i1:i2,j)
   enddo
 
   nsubmode=0
@@ -191,7 +192,12 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
 !             irc,trim(decoded)
 !3055    format(i6,i3,6f8.2,i5,2x,a)
 !        close(55)
-        go to 900
+        base=(sum(ccf1(-ia:-ia+9)) + sum(ccf1(ia-9:ia)))/20.0
+        ccf1=ccf1-base
+        smax=maxval(ccf1)
+        if(smax.gt.10.0) ccf1=10.0*ccf1/smax
+        go to 200
+!        go to 900
      endif
   enddo
 
@@ -214,31 +220,44 @@ subroutine q65_sync(nutc,iwave,nmax,mode_q65,codewords,ncw,nsps,nfqso,ntol, &
   ijpk=maxloc(ccf)
   ipk=ijpk(1)-ia-1
   jpk=ijpk(2)-53-1
+
   f0=nfqso + ipk*df
   xdt=jpk*dtstep
   sq=0.
   nsq=0
-  do j=lag1,lag2
-     if(abs(j-jpk).gt.6) then
-        sq=sq + ccf(ipk,j)**2
-        nsq=nsq+1
-     endif
+  do i=-ia,ia
+     do j=lag1,lag2
+        if(abs(j-jpk).gt.8 .and. abs(i-ipk).gt.ia/2) then
+           sq=sq + ccf(i,j)**2
+           nsq=nsq+1
+        endif
+     enddo
   enddo
   rms=sqrt(sq/nsq)
   smax=ccf(ipk,jpk)
   snr1=smax/rms
-  call zplot_q65(ccf(-ia:ia,lag1:lag2),ia,lag1,lag2,rms,dtstep,ntol,emedelay)
+  ccf1=ccf(-ia:ia,jpk)/rms
+  if(snr1.gt.10.0) ccf1=(10.0/snr1)*ccf1
+
+200 do i=-ia,ia
+     freq=nfqso + i*df
+     write(17,1100) freq,ccf1(i)
+1100 format(2f10.3)
+  enddo
+  close(17)
   
+  if(ia.le.60) call zplot_q65(ccf(-ia:ia,lag1:lag2),ia,lag1,lag2,   &
+       rms,dtstep,ntol,smax,emedelay)
 900 return
 end subroutine q65_sync
 
-subroutine zplot_q65(ccf,ia,lag1,lag2,rms,dtstep,ntol,emedelay)
+subroutine zplot_q65(ccf,ia,lag1,lag2,rms,dtstep,ntol,smax,emedelay)
 
   real ccf(-ia:ia,lag1:lag2)
-  character*1 line(70),mark(0:6)
-  character*35 blanks
+  character*1 line(130),mark(0:6)
+  character*60 blanks
   data mark/' ',' ','.','-','+','X','#'/
-  data blanks/'                                   '/
+  data blanks/'                                                  '/
 
 !  open(35,file='ccf.dat',status='unknown',access='stream')
 !  write(35) ia,lag1,lag2,rms,dtstep
@@ -246,14 +265,16 @@ subroutine zplot_q65(ccf,ia,lag1,lag2,rms,dtstep,ntol,emedelay)
 !  close(35)
   open(34,file='ccf.txt',status='unknown')
   write(34,1000) -ntol,blanks(1:ia-2),0,blanks(1:ia-2),ntol
-1000 format(5x,i3,a,i1,a,i3)
+1000 format(4x,i4,a,i1,a,i3)
+  fac=1.0
+  if(smax/rms.gt.7.0) fac=7.0*rms/smax
   k=0
   do j=lag2,lag1,-1
      t=j*dtstep
      if(emedelay.eq.0.0 .and. abs(t).gt.1.0) cycle
      do i=-ia,ia
         k=i+ia+2
-        n=ccf(i,j)/rms
+        n=fac*ccf(i,j)/rms
         if(n.lt.0) n=0
         if(n.gt.6) n=6
         line(k)=mark(n)
@@ -261,7 +282,7 @@ subroutine zplot_q65(ccf,ia,lag1,lag2,rms,dtstep,ntol,emedelay)
      line(1)='|'
      line(k+1)='|'
      write(34,1010) t,line(1:k+1)
-1010 format(f5.2,1x,72a1)
+1010 format(f5.2,1x,132a1)
   enddo
   close(34)
 
diff --git a/widgets/mainwindow.cpp b/widgets/mainwindow.cpp
index 1f9ed0198..b10a25a39 100644
--- a/widgets/mainwindow.cpp
+++ b/widgets/mainwindow.cpp
@@ -3305,7 +3305,7 @@ void MainWindow::to_jt9(qint32 n, qint32 istart, qint32 idone)
 void MainWindow::decodeDone ()
 {
   if(m_mode!="FT8" or dec_data.params.nzhsym==50) m_nDecodes=0;
-  if(m_mode=="QRA64") m_wideGraph->drawRed(0,0);
+  if(m_mode=="QRA64" or m_mode=="Q65") m_wideGraph->drawRed(0,0);
 
   if(m_mode=="Q65" and m_msgAvgWidget!=NULL) {
     if(m_msgAvgWidget->isVisible()) {
@@ -6442,7 +6442,8 @@ void MainWindow::on_actionQ65_triggered()
 //###  ui->sbSubmode->setMaximum(4);
   ui->sbSubmode->setMaximum(7);
   ui->sbSubmode->setValue(m_nSubMode);
-  m_wideGraph->setMode(m_mode);
+  QString fname {QDir::toNativeSeparators(m_config.temp_dir().absoluteFilePath ("red.dat"))};
+  m_wideGraph->setRedFile(fname);
   m_wideGraph->setMode(m_mode);
   m_wideGraph->setModeTx(m_modeTx);
   m_wideGraph->setPeriod(m_TRperiod,6912);
diff --git a/widgets/plotter.cpp b/widgets/plotter.cpp
index 2f774f5b6..a225581fd 100644
--- a/widgets/plotter.cpp
+++ b/widgets/plotter.cpp
@@ -224,7 +224,7 @@ void CPlotter::draw(float swide[], bool bScroll, bool bRed)
 
     if(i==iz-1) {
       painter2D.drawPolyline(LineBuf,j);
-      if(m_mode=="QRA64") {
+      if(m_mode=="QRA64" or m_mode=="Q65") {
         painter2D.setPen(Qt::red);
         painter2D.drawPolyline(LineBuf2,ktop);
       }
@@ -269,33 +269,28 @@ void CPlotter::draw(float swide[], bool bScroll, bool bRed)
     painter2D.drawText(x1-4,y,"73");
   }
 
-    if(bRed) {
-      std::ifstream f;
-      f.open(m_redFile.toLatin1());
-      if(f) {
-        int x,y;
-        float freq,sync;
-        float slimit=6.0;
-        QPen pen0(Qt::red,1);
-        painter1.setPen(pen0);
-        for(int i=0; i<99999; i++) {
-          f >> freq >> sync;
-          if(f.eof()) break;
-          x=XfromFreq(freq);
-          y=(sync-slimit)*3.0;
-          if(y>0) {
-            if(y>15.0) y=15.0;
-            if(x>=0 and x<=m_w) {
-              painter1.setPen(pen0);
-              painter1.drawLine(x,0,x,y);
-            }
-          }
-        }
-        f.close();
+  if(bRed and m_bQ65_Sync) {
+    int k=0;
+    std::ifstream f;
+    f.open(m_redFile.toLatin1());
+    if(f) {
+      int x,y;
+      float freq,sync;
+      for(int i=0; i<99999; i++) {
+        f >> freq >> sync;
+        if(f.eof()) break;
+        x=XfromFreq(freq);
+        y=m_h2*(0.9 - 0.09*gain2d*sync) - m_plot2dZero;
+        LineBuf2[k].setX(x);
+        LineBuf2[k].setY(y);
+        k++;
       }
-//      m_bDecodeFinished=false;
+      f.close();
+      QPen pen0(Qt::red,2);
+      painter2D.setPen(pen0);
+      painter2D.drawPolyline(LineBuf2,k);
     }
-
+  }
   update();                                    //trigger a new paintEvent
   m_bScaleOK=true;
 }
diff --git a/widgets/plotter.h b/widgets/plotter.h
index ac13b5408..1aeacf811 100644
--- a/widgets/plotter.h
+++ b/widgets/plotter.h
@@ -80,6 +80,8 @@ public:
   void setRxBand(QString band);
   void setReference(bool b) {m_bReference = b;}
   bool Reference() const {return m_bReference;}
+  void setQ65_Sync(bool b) {m_bQ65_Sync = b;}
+  bool Q65_Sync() const {return m_bQ65_Sync;}
   void drawRed(int ia, int ib, float swide[]);
   void setVHF(bool bVHF);
   void setRedFile(QString fRed);
@@ -113,6 +115,7 @@ private:
   bool    m_bLinearAvg;
   bool    m_bReference;
   bool    m_bReference0;
+  bool    m_bQ65_Sync;
   bool    m_bVHF;
   bool    m_bSingleDecode;
 
diff --git a/widgets/widegraph.cpp b/widgets/widegraph.cpp
index a369f6296..75064f776 100644
--- a/widgets/widegraph.cpp
+++ b/widgets/widegraph.cpp
@@ -75,10 +75,12 @@ WideGraph::WideGraph(QSettings * settings, QWidget *parent) :
     ui->widePlot->setCumulative(m_settings->value("Cumulative",true).toBool());
     ui->widePlot->setLinearAvg(m_settings->value("LinearAvg",false).toBool());
     ui->widePlot->setReference(m_settings->value("Reference",false).toBool());
+    ui->widePlot->setQ65_Sync(m_settings->value("Q65_Sync",false).toBool());
     if(ui->widePlot->current()) ui->spec2dComboBox->setCurrentIndex(0);
     if(ui->widePlot->cumulative()) ui->spec2dComboBox->setCurrentIndex(1);
     if(ui->widePlot->linearAvg()) ui->spec2dComboBox->setCurrentIndex(2);
     if(ui->widePlot->Reference()) ui->spec2dComboBox->setCurrentIndex(3);
+    if(ui->widePlot->Q65_Sync()) ui->spec2dComboBox->setCurrentIndex(4);
     int nbpp=m_settings->value("BinsPerPixel",2).toInt();
     ui->widePlot->setBinsPerPixel(nbpp);
     ui->sbPercent2dPlot->setValue(m_Percent2DScreen);
@@ -135,6 +137,7 @@ void WideGraph::saveSettings()                                           //saveS
   m_settings->setValue ("Cumulative", ui->widePlot->cumulative());
   m_settings->setValue ("LinearAvg", ui->widePlot->linearAvg());
   m_settings->setValue ("Reference", ui->widePlot->Reference());
+  m_settings->setValue ("Q65_Sync", ui->widePlot->Q65_Sync());
   m_settings->setValue ("BinsPerPixel", ui->widePlot->binsPerPixel ());
   m_settings->setValue ("StartFreq", ui->widePlot->startFreq ());
   m_settings->setValue ("WaterfallPalette", m_waterfallPalette);
@@ -321,6 +324,7 @@ void WideGraph::on_spec2dComboBox_currentIndexChanged(int index)
   ui->widePlot->setCumulative(false);
   ui->widePlot->setLinearAvg(false);
   ui->widePlot->setReference(false);
+  ui->widePlot->setQ65_Sync(false);
   ui->smoSpinBox->setEnabled(false);
   switch (index)
     {
@@ -337,6 +341,9 @@ void WideGraph::on_spec2dComboBox_currentIndexChanged(int index)
     case 3:                     // Reference
       ui->widePlot->setReference(true);
       break;
+    case 4:
+      ui->widePlot->setQ65_Sync(true);
+      break;
     }
   replot();
 }
@@ -480,7 +487,7 @@ void WideGraph::on_gain2dSlider_valueChanged(int value)               //Gain2
   ui->widePlot->setPlot2dGain(value);
   if(ui->widePlot->scaleOK ()) {
     ui->widePlot->draw(swide,false,false);
-    if(m_mode=="QRA64") ui->widePlot->draw(swide,false,true);
+    if(m_mode=="QRA64" or m_mode=="Q65") ui->widePlot->draw(swide,false,true);
   }
 }
 
@@ -489,7 +496,7 @@ void WideGraph::on_zero2dSlider_valueChanged(int value)               //Zero2
   ui->widePlot->setPlot2dZero(value);
   if(ui->widePlot->scaleOK ()) {
     ui->widePlot->draw(swide,false,false);
-    if(m_mode=="QRA64") ui->widePlot->draw(swide,false,true);
+    if(m_mode=="QRA64" or m_mode=="Q65") ui->widePlot->draw(swide,false,true);
   }
 }
 
diff --git a/widgets/widegraph.ui b/widgets/widegraph.ui
index b0165e040..d78757444 100644
--- a/widgets/widegraph.ui
+++ b/widgets/widegraph.ui
@@ -335,6 +335,11 @@
           <string>Reference</string>
          </property>
         </item>
+        <item>
+         <property name="text">
+          <string>Q65_Sync</string>
+         </property>
+        </item>
        </widget>
       </item>
       <item row="0" column="2">