diff --git a/libm65/synctst.f90 b/libm65/synctst.f90
new file mode 100644
index 000000000..b91373004
--- /dev/null
+++ b/libm65/synctst.f90
@@ -0,0 +1,84 @@
+program synctst
+
+! Tests JT65B2 sync patterns
+
+  parameter (LAGMAX=20)
+  real ccf0(0:LAGMAX),ccf2(0:LAGMAX),ccf3(0:LAGMAX)
+  character*12 arg
+  integer npr(126),np0(126),np1(126),npr2(126)
+  data npr/1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0,  &
+           0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1,  &
+           0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1,  &
+           0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1,  &
+           1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1,  &
+           0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1,  &
+           1,1,1,1,1,1/
+
+  nargs=iargc()
+  if(nargs.ne.1) then
+     print*,'Usage: synctst iters'
+     go to 999
+  endif
+  call getarg(1,arg)
+  read(arg,*) iters
+
+  worst=0.
+  do lag=0,LAGMAX
+     nsum=0
+     do i=1,126-lag
+        nsum=nsum + npr(i)*npr(lag+i)
+     enddo
+     ccf0(lag)=2.0*nsum/(126.0-lag)
+     if(lag.ge.1 .and. ccf0(lag).gt.worst) worst=ccf0(lag)
+  enddo
+
+  best2=1.0
+  do iter=1,iters
+
+10   np0=0
+     np1=0
+     n0=0
+     do i=1,126
+        if(npr(i).eq.1) then
+           call random_number(r)
+           if(r.lt.0.5) then
+              np0(i)=1
+              n0=n0+1
+           else
+              np1(i)=1
+           endif
+        endif
+     enddo
+     if(n0.ne.31 .and. n0.ne.32) go to 10
+
+     worst2=0.
+     do lag=0,LAGMAX
+        nsum=0
+        do i=1,126-lag
+           nsum=nsum + np0(i)*np0(lag+i) + np1(i)*np1(lag+i)
+        enddo
+        ccf2(lag)=2.0*nsum/(126.0-lag)
+        if(lag.ge.1 .and. ccf2(lag).gt.worst2) then
+           worst2=ccf2(lag)
+           lagbad=lag
+        endif
+     enddo
+     if(worst2.lt.best2) then
+        best2=worst2
+        lagbest=lagbad
+        n0best=n0
+        ccf3=ccf2
+        npr2=np0 + 2*np1           
+     endif
+  enddo
+
+  do lag=0,LAGMAX
+     write(13,1100) lag,ccf0(lag),ccf3(lag)
+1100 format(i3,2f10.3)
+  enddo
+
+  print*,worst,best2,n0best,lagbest
+  write(*,1110) npr2
+1110 format((8x,20(i1,',')))
+
+999 end program synctst
diff --git a/libm65/synctst2.f90 b/libm65/synctst2.f90
new file mode 100644
index 000000000..34893f96e
--- /dev/null
+++ b/libm65/synctst2.f90
@@ -0,0 +1,91 @@
+program synctst2
+
+! Tests JT65B2 sync patterns
+
+  parameter (LAGMAX=20)
+  real ccf0(0:LAGMAX),ccf1(0:LAGMAX),ccf2(0:LAGMAX),ccf3(0:LAGMAX)
+  character arg*12,line*64
+  integer*8 n8
+  integer npr(126),np0(126),np1(126),npr1(126),npr2(126)
+  data npr/1,0,0,1,1,0,0,0,1,1,1,1,1,1,0,1,0,1,0,0,  &
+           0,1,0,1,1,0,0,1,0,0,0,1,1,1,0,0,1,1,1,1,  &
+           0,1,1,0,1,1,1,1,0,0,0,1,1,0,1,0,1,0,1,1,  &
+           0,0,1,1,0,1,0,1,0,1,0,0,1,0,0,0,0,0,0,1,  &
+           1,0,0,0,0,0,0,0,1,1,0,1,0,0,1,0,1,1,0,1,  &
+           0,1,0,1,0,0,1,1,0,0,1,0,0,1,0,0,0,0,1,1,  &
+           1,1,1,1,1,1/
+
+  data npr2/1,0,0,1,2,0,0,0,2,1,1,2,2,2,0,2,0,2,0,0,  &
+            0,1,0,2,1,0,0,1,0,0,0,2,1,1,0,0,1,1,2,2,  &
+            0,2,2,0,2,1,1,1,0,0,0,1,2,0,1,0,2,0,1,1,  &
+            0,0,2,2,0,1,0,1,0,2,0,0,2,0,0,0,0,0,0,1,  &
+            1,0,0,0,0,0,0,0,1,2,0,2,0,0,2,0,2,1,0,1,  &
+            0,2,0,1,0,0,2,2,0,0,1,0,0,2,0,0,0,0,1,1,  &
+            1,2,1,2,1,2/
+
+  data n8/x'4314f4725bb357e0'/
+
+  write(*,1102) n8
+  write(line,1102) n8
+1102 format(b63)
+  read(line,1104) npr1(1:63)
+1104 format(63i1)
+  npr1(64:126)=npr1(1:63)
+
+  worst=0.
+  do lag=0,LAGMAX
+     nsum=0
+     do i=1,126-lag
+        nsum=nsum + npr(i)*npr(lag+i)
+     enddo
+     ccf0(lag)=2.0*nsum/(126.0-lag)
+     if(lag.ge.1 .and. ccf0(lag).gt.worst) worst=ccf0(lag)
+  enddo
+  
+
+  worst1=0.
+  do lag=0,LAGMAX
+     nsum=0
+     do i=1,126-lag
+        nsum=nsum + npr1(i)*npr1(lag+i)
+     enddo
+     ccf1(lag)=(63.0/64.0)*2.0*nsum/(126.0-lag)
+     if(lag.ge.1 .and. ccf1(lag).gt.worst1) worst1=ccf1(lag)
+  enddo
+  ccf1=ccf1/ccf1(0)
+  worst1=worst1/ccf1(0)
+
+  np0=0
+  np1=0
+  n0=0
+  do i=1,126
+     if(npr2(i).eq.1) then
+        np0(i)=1
+        n0=n0+1
+     else if(npr2(i).eq.2) then
+        np1(i)=1
+     endif
+  enddo
+  
+  worst2=0.
+  do lag=0,LAGMAX
+     nsum=0
+     do i=1,126-lag
+        nsum=nsum + np0(i)*np0(lag+i) + np1(i)*np1(lag+i)
+     enddo
+     ccf2(lag)=2.0*nsum/(126.0-lag)
+     if(lag.ge.1 .and. ccf2(lag).gt.worst2) then
+        worst2=ccf2(lag)
+        lagbad=lag
+     endif
+  enddo
+
+  do lag=0,LAGMAX
+     write(13,1100) lag,ccf0(lag),ccf1(lag),ccf2(lag)
+1100 format(i3,3f10.3)
+  enddo
+
+  print*,worst,worst1,worst2,n0,lagbad
+
+
+999 end program synctst2
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 7f0050f2f..1bdab40ba 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,4 +1,4 @@
-//-------------------------------------------------------------- MainWindow
+//--------------------------------------------------------------- MainWindow
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include "devsetup.h"