diff --git a/qmap/libqmap/decode0.f90 b/qmap/libqmap/decode0.f90
index a11c2dccd..4870c1f13 100644
--- a/qmap/libqmap/decode0.f90
+++ b/qmap/libqmap/decode0.f90
@@ -22,7 +22,7 @@ subroutine decode0(dd,ss,savg)
 
   nQDecoderDone=0
   if(newdat.ne.0) then
-     nz=96000*nhsym/5.3833
+     nz=96000*nhsym*0.15
      hist=0
      do i=1,nz
         j1=min(abs(dd(1,i)),32768.0)
diff --git a/qmap/libqmap/q65_sync.f90 b/qmap/libqmap/q65_sync.f90
index 1157cce5e..7c0a1a0c4 100644
--- a/qmap/libqmap/q65_sync.f90
+++ b/qmap/libqmap/q65_sync.f90
@@ -15,9 +15,9 @@ subroutine q65_sync(ss,i0,nts_q65,sync_ok,snr,xdt)
   data first/.true./
   save first,isync
 
-  tstep=2048.0/11025.0        !0.185760 s: 0.5*tsym_jt65, 0.3096*tsym_q65
+  tstep=0.15                      !0.5*tsym_Q65-30x, 0.25*tsys_Q65-60x
   if(first) then
-     fac=0.6/tstep            !3.230
+     fac=0.6/tstep
      do i=1,22                                !Expand the Q65 sync stride
         isync(i)=nint((isync(i)-1)*fac) + 1
      enddo
diff --git a/qmap/libqmap/symspec.f90 b/qmap/libqmap/symspec.f90
index 574dc8b63..0ef92d759 100644
--- a/qmap/libqmap/symspec.f90
+++ b/qmap/libqmap/symspec.f90
@@ -38,7 +38,7 @@ subroutine symspec(k,ndiskdat,nb,nbslider,nfsample,    &
      enddo
   endif
 
-  hsym=2048.d0*96000.d0/11025.d0      !Samples per JT65 half-symbol
+  hsym=0.15d0*96000.d0                 !Samples per Q65-30x half-symbol
 
   if(k.lt.k0) then
      ts=1.d0 - hsym
diff --git a/qmap/mainwindow.cpp b/qmap/mainwindow.cpp
index d89390a44..8ebe2b627 100644
--- a/qmap/mainwindow.cpp
+++ b/qmap/mainwindow.cpp
@@ -705,9 +705,10 @@ void MainWindow::diskDat()                                   //diskDat()
   //These may be redundant??
   m_diskData=true;
   datcom_.newdat=1;
-  hsym=2048.0*96000.0/11025.0;         //Samples per JT65 half-symbol
-  for(int i=0; i<304; i++) {           // Do the half-symbol FFTs
-    int k = i*hsym + 2048.5;
+  hsym=0.15*96000.0;                   //Samples per Q65-30x half-symbol or Q65-60x quarter-symbol
+  for(int i=0; i<380; i++) {           // Do the half-symbol FFTs
+    int k = i*hsym + 0.5;
+    if(k > 56*96000) break;
     dataSink(k);
     qApp->processEvents();             // Allow the waterfall to update
   }
diff --git a/qmap/mainwindow.h b/qmap/mainwindow.h
index e5551c8ec..2709278ac 100644
--- a/qmap/mainwindow.h
+++ b/qmap/mainwindow.h
@@ -113,7 +113,7 @@ private:
   qint32  m_modeQ65;
   qint32  m_dB;
   qint32  m_fetched=0;
-  qint32  m_hsymStop=302;
+  qint32  m_hsymStop=371;
   qint32  m_nTransmitted=0;
   qint32  m_nDoubleClicked=0;