diff --git a/map65/libm65/synctest.f90 b/map65/libm65/synctest.f90
index 893e659de..5f57ec71d 100644
--- a/map65/libm65/synctest.f90
+++ b/map65/libm65/synctest.f90
@@ -8,25 +8,36 @@ program synctest
   real candidate(MAX_CANDIDATES,5)             !snr1,f0,xdt0,ipol,flip
   character*8 arg
 
-  open(50,file='50.a',form='unformatted',status='old')
+  nargs=iargc()
+  if(nargs.ne.5) then
+     print*,'Usage:   synctest iutc nfa nfb nts_jt65 nts_q65'
+     print*,'Example: synctest 1814  23  83      2        1'
+     go to 999
+  endif
   call getarg(1,arg)
   read (arg,*) iutc
-  
-  do ifile=1,999
-     read(50,end=999) nutc,npol,ss(1:npol,:,:),savg(1:npol,:)
+  call getarg(2,arg)
+  read (arg,*) nfa
+  call getarg(3,arg)
+  read (arg,*) nfb
+  call getarg(4,arg)
+  read (arg,*) nts_jt65
+  call getarg(5,arg)
+  read (arg,*) nts_q65
+
+  open(50,file='50.a',form='unformatted',status='old')
+  do ifile=1,9999
+     read(50,end=998) nutc,npol,ss(1:npol,:,:),savg(1:npol,:)
      if(nutc.eq.iutc) exit
   enddo
   close(50)
 
   call init_timer('timer.out')
   call timer('synctest',0)
-  
-  print*,nutc,npol
-  nfa=23        !144.100
-  nfb=83        !144.16
-  nts_jt65=2    !JT65B tone spacing
-  nts_q65=1     !Q65-60A tone spacing
+
+  call timer('get_cand',0)
   call  get_candidates(ss,savg,nfa,nfb,nts_jt65,nts_q65,candidate,ncand)
+  call timer('get_cand',1)
 
   do k=1,ncand
      snr1=candidate(k,1)
@@ -38,25 +49,22 @@ program synctest
 1010 format(i3,4f10.3,2i3,f8.3)
   enddo
 
-999 call timer('synctest',1)
+998 call timer('synctest',1)
   call timer('synctest',101)
   call fini_timer()
 
-end program synctest
+999 end program synctest
 
-subroutine get_candidates(ss,savg,nfa,nfb,nts_q65,nts_jt65,candidate,ncand)
+subroutine get_candidates(ss,savg,nfa,nfb,nts_jt65,nts_q65,candidate,ncand)
 
   use wideband2_sync
-  use timer_module, only: timer
   parameter (MAX0=1000,MAX_CANDIDATES=20)
   real ss(4,322,NFFT),savg(4,NFFT)
   real candidate(MAX_CANDIDATES,5)             !snr1,f0,xdt0,ipol,flip
   integer indx(NFFT)
   logical skip
 
-  call timer('wb_sync ',0)
   call wb2_sync(ss,savg,nfa,nfb)
-  call timer('wb_sync ',1)
 
   df3=96000.0/NFFT
   ia=nint(1000*nfa/df3)
@@ -74,8 +82,11 @@ subroutine get_candidates(ss,savg,nfa,nfb,nts_q65,nts_jt65,candidate,ncand)
      j=indx(iz+1-i) + ia - 1
      f0=0.001*j*df3
      snr1=sync_dat(j,2)
-     if(snr1.lt.3.0) exit
+     if(snr1.lt.5.0) exit
      flip=sync_dat(j,5)
+     if(flip.ne.0.0 .and. nts_jt65.eq.0) cycle
+     if(flip.eq.0.0 .and. nts_q65.eq.0) cycle
+     if(sync_dat(j,6).lt.3.0) cycle
      bw=nts_q65*108.0
      if(flip.ne.0) bw=nts_jt65*177.0
      skip=.false.
@@ -83,7 +94,6 @@ subroutine get_candidates(ss,savg,nfa,nfb,nts_q65,nts_jt65,candidate,ncand)
         diffhz=1000.0*(f0-candidate(n,2))
         if(diffhz.gt.-10.0 .and. diffhz.lt.bw) skip=.true.
      enddo
-     if(sync_dat(j,6).lt.3.0) skip=.true.
      if(skip) cycle
      k=k+1
      xdt0=sync_dat(j,3)
diff --git a/map65/libm65/wideband2_sync.f90 b/map65/libm65/wideband2_sync.f90
index 99725cfd1..0551f91fc 100644
--- a/map65/libm65/wideband2_sync.f90
+++ b/map65/libm65/wideband2_sync.f90
@@ -17,7 +17,7 @@ subroutine wb2_sync(ss,savg,nfa,nfb)
   real savg(4,NFFT)
   logical first
   integer isync0(22)
-  integer jsync0(63)
+  integer jsync0(63),jsync1(63)
 ! Q65 sync symbols
   data isync0/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
   data jsync0/                                                         &
@@ -25,15 +25,14 @@ subroutine wb2_sync(ss,savg,nfa,nfb)
        33, 34, 37, 38, 39, 40, 42, 43, 45, 46, 47, 48, 52, 53, 55, 57, &
        59, 60, 63, 64, 66, 68, 70, 73, 80, 81, 89, 90, 92, 95, 97, 98, &
        100,102,104,107,108,111,114,119,120,121,122,123,124,125,126/
+  data jsync1/                                                         &
+       2,  3,  6,  7,  8, 15, 17, 19, 20, 21, 23, 26, 27, 29, 30, 31,  &
+       35, 36, 41, 44, 49, 50, 51, 54, 56, 58, 61, 62, 65, 67, 69, 71, &
+       72, 74, 75, 76, 77, 78, 79, 82, 83, 84, 85, 86, 87, 88, 91, 93, &
+       94, 96, 99,101,103,105,106,109,110,112,113,115,116,117,118/
   data first/.true./
   save first
 
-  do j=322,1,-1
-     if(sum(ss(1,j,1:NFFT)).gt.0.0) exit
-  enddo
-  jz=j
-
-
   tstep=2048.0/11025.0        !0.185760 s: 0.5*tsym_jt65, 0.3096*tsym_q65
   if(first) then
      fac=0.6/tstep
@@ -42,10 +41,17 @@ subroutine wb2_sync(ss,savg,nfa,nfb)
      enddo
      do i=1,63
         jsync0(i)=2*(jsync0(i)-1) + 1
+        jsync1(i)=2*(jsync1(i)-1) + 1
      enddo
      first=.false.
   endif
 
+  do j=322,1,-1
+     if(sum(ss(1,j,1:NFFT)).gt.0.0) exit
+  enddo
+  jz=j
+
+
   df3=96000.0/NFFT
   ia=nint(1000*nfa/df3)          !Flat frequency range for WSE converters
   ib=nint(1000*nfb/df3)
@@ -93,6 +99,19 @@ subroutine wb2_sync(ss,savg,nfa,nfb)
               flip=1.0
            endif
 
+           ccf=0.
+           do j=1,63
+              k=jsync1(j) + lag
+              ccf=ccf + ss(ipol,k,i+1) + ss(ipol,k+1,i+1)
+           enddo
+           ccf=ccf - savg(ipol,i+1)*2*63/float(jz)
+           if(ccf.gt.ccfmax) then
+              ipolbest=ipol
+              lagbest=lag
+              ccfmax=ccf
+              flip=-1.0
+           endif
+
         enddo  ! lag
      enddo  !ipol