diff --git a/CMakeLists.txt b/CMakeLists.txt
index 376401c46..9726caee0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -377,6 +377,7 @@ set (wsjt_FSRCS
   lib/options.f90
   lib/packjt.f90
   lib/77bit/packjt77.f90
+  lib/qra66_decode.f90
   lib/readwav.f90
   lib/timer_C_wrapper.f90
   lib/timer_impl.f90
@@ -575,6 +576,7 @@ set (wsjt_FSRCS
   lib/symspec65.f90
   lib/sync4.f90
   lib/sync64.f90
+  lib/sync66.f90
   lib/sync65.f90
   lib/ft4/getcandidates4.f90
   lib/ft4/get_ft4_bitmetrics.f90
diff --git a/lib/decoder.f90 b/lib/decoder.f90
index a3269aef9..4faae181b 100644
--- a/lib/decoder.f90
+++ b/lib/decoder.f90
@@ -9,6 +9,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
   use ft8_decode
   use ft4_decode
   use fst4_decode
+  use qra66_decode
 
   include 'jt9com.f90'
   include 'timer_common.inc'
@@ -37,6 +38,10 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
      integer :: decoded
   end type counting_fst4_decoder
 
+  type, extends(qra66_decoder) :: counting_qra66_decoder
+     integer :: decoded
+  end type counting_qra66_decoder
+
   real ss(184,NSMAX)
   logical baddata,newdat65,newdat9,single_decode,bVHF,bad0,newdat,ex
   integer*2 id2(NTMAX*12000)
@@ -54,6 +59,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
   type(counting_ft8_decoder) :: my_ft8
   type(counting_ft4_decoder) :: my_ft4
   type(counting_fst4_decoder) :: my_fst4
+  type(counting_qra66_decoder) :: my_qra66
 
   !cast C character arrays to Fortran character strings
   datetime=transfer(params%datetime, datetime)
@@ -69,6 +75,7 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
   my_ft8%decoded = 0
   my_ft4%decoded = 0
   my_fst4%decoded = 0
+  my_qra66%decoded = 0
   
 ! For testing only: return Rx messages stored in a file as decodes
   inquire(file='rx_messages.txt',exist=ex)
@@ -187,6 +194,16 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
      go to 800
   endif
 
+  if(params%nmode.eq.66) then
+! We're in QRA66 mode
+     call timer('decqra66',0)
+     call my_qra66%decode(qra66_decoded,id2,params%nutc,params%nfa,         &
+          params%nfb,params%nfqso,params%ndepth,logical(params%lapcqonly),  &
+          mycall,hiscall,hisgrid)
+     call timer('decqra66',1)
+     go to 800
+  endif
+
   if(params%nmode.eq.240) then
 ! We're in FST4 mode
      ndepth=iand(params%ndepth,3)
@@ -759,4 +776,65 @@ contains
    return
  end subroutine fst4_decoded
 
+ subroutine qra66_decoded (this,nutc,sync,nsnr,dt,freq,decoded,nap,   &
+       qual,ntrperiod,fmid,w50)
+
+    use qra66_decode
+    implicit none
+
+    class(qra66_decoder), intent(inout) :: this
+    integer, intent(in) :: nutc
+    real, intent(in) :: sync
+    integer, intent(in) :: nsnr
+    real, intent(in) :: dt
+    real, intent(in) :: freq
+    character(len=37), intent(in) :: decoded
+    integer, intent(in) :: nap
+    real, intent(in) :: qual
+    integer, intent(in) :: ntrperiod
+    real, intent(in) :: fmid
+    real, intent(in) :: w50
+
+    character*2 annot
+    character*37 decoded0
+    character*70 line
+
+    decoded0=decoded
+    annot='  '
+    if(nap.ne.0) then
+       write(annot,'(a1,i1)') 'a',nap
+       if(qual.lt.0.17) decoded0(37:37)='?'
+    endif
+
+    if(ntrperiod.lt.60) then
+       write(line,1001) nutc,nsnr,dt,nint(freq),decoded0,annot
+1001   format(i6.6,i4,f5.1,i5,' ` ',1x,a37,1x,a2)
+       write(13,1002) nutc,nint(sync),nsnr,dt,freq,0,decoded0
+1002   format(i6.6,i4,i5,f6.1,f8.0,i4,3x,a37,' FST4')
+    else
+       write(line,1003) nutc,nsnr,dt,nint(freq),decoded0,annot
+1003   format(i4.4,i4,f5.1,i5,' ` ',1x,a37,1x,a2,2f7.3)
+       write(13,1004) nutc,nint(sync),nsnr,dt,freq,0,decoded0
+1004   format(i4.4,i4,i5,f6.1,f8.0,i4,3x,a37,' FST4')
+    endif
+
+    if(fmid.ne.-999.0) then
+       if(w50.lt.0.95) write(line(65:70),'(f6.3)') w50
+       if(w50.ge.0.95) write(line(65:70),'(f6.2)') w50
+    endif
+
+    write(*,1005) line
+1005 format(a70)
+
+    call flush(6)
+    call flush(13)
+
+    select type(this)
+    type is (counting_qra66_decoder)
+       this%decoded = this%decoded + 1
+    end select
+
+   return
+ end subroutine qra66_decoded
+
 end subroutine multimode_decoder
diff --git a/lib/jt9.f90 b/lib/jt9.f90
index a08a20cb2..3c017ac18 100644
--- a/lib/jt9.f90
+++ b/lib/jt9.f90
@@ -26,7 +26,7 @@ program jt9
        fhigh=4000,nrxfreq=1500,ndepth=1,nexp_decode=0,nQSOProg=0
   logical :: read_files = .true., tx9 = .false., display_help = .false.,     &
        bLowSidelobes = .false.
-  type (option) :: long_options(29) = [ &
+  type (option) :: long_options(30) = [ &
     option ('help', .false., 'h', 'Display this help message', ''),          &
     option ('shmem',.true.,'s','Use shared memory for sample data','KEY'),   &
     option ('tr-period', .true., 'p', 'Tx/Rx period, default SECONDS=60',     &
@@ -51,6 +51,7 @@ program jt9
     option ('fft-threads', .true., 'm',                                      &
         'Number of threads to process large FFTs, default THREADS=1',        &
         'THREADS'),                                                          &
+    option ('qra66', .false., '3', 'QRA66 mode', ''),                        &
     option ('jt4', .false., '4', 'JT4 mode', ''),                            &
     option ('ft4', .false., '5', 'FT4 mode', ''),                            &
     option ('jt65', .false.,'6', 'JT65 mode', ''),                           &
@@ -86,7 +87,7 @@ program jt9
   TRperiod=60.d0
 
   do
-     call getopt('hs:e:a:b:r:m:p:d:f:w:t:987654WqTL:S:H:c:G:x:g:X:Q:',      &
+     call getopt('hs:e:a:b:r:m:p:d:f:w:t:9876543WqTL:S:H:c:G:x:g:X:Q:',      &
           long_options,c,optarg,arglen,stat,offset,remain,.true.)
      if (stat .ne. 0) then
         exit
@@ -123,6 +124,8 @@ program jt9
            mode = 164
         case ('Q')
            read (optarg(:arglen), *) nQSOProg
+        case ('3')
+           mode = 66
         case ('4')
            mode = 4
         case ('5')