diff --git a/lib/genqra64.f90 b/lib/genqra64.f90
index 4931342eb..babe7d692 100644
--- a/lib/genqra64.f90
+++ b/lib/genqra64.f90
@@ -4,15 +4,17 @@ subroutine genqra64(msg0,ichk,msgsent,itone,itype)
 
   use packjt
   character*22 msg0
-  character*22 message          !Message to be generated
-  character*22 msgsent          !Message as it will be received
-  integer itone(84)
-  character*3 cok               !'   ' or 'OOO'
+  character*22 message            !Message to be generated
+  character*22 msgsent            !Message as it will be received
+  integer itone(85)               !QRA64 uses only 84
+  character*3 cok                 !'   ' or 'OOO'
   logical old_qra_sync
   integer dgen(13)
   integer sent(63)
+  integer b11(11)                 !Barker 11 code
   integer icos7(0:6)
-  data icos7/2,5,6,0,4,1,3/     !Defines a 7x7 Costas array
+  data icos7/2,5,6,0,4,1,3/       !Defines a 7x7 Costas array
+  data b11/1,1,1,0,0,0,1,0,0,1,0/ !Barker 11 definition
   save
 
   if(msg0(1:1).eq.'@') then
@@ -39,18 +41,31 @@ subroutine genqra64(msg0,ichk,msgsent,itone,itype)
      call chkmsg(message,cok,nspecial,flip)
      call packmsg(message,dgen,itype)    !Pack message into 72 bits
      call unpackmsg(dgen,msgsent)        !Unpack to get message sent
-     if(ichk.ne.0) go to 999             !Return if checking only
+     if(ichk.eq.1) go to 999             !Return if checking only
      call qra64_enc(dgen,sent)           !Encode using QRA64
 
-     nsync=10
-     inquire(file='old_qra_sync',exist=old_qra_sync)
-     if(old_qra_sync) nsync=1
-
-     itone(1:7)=nsync*icos7              !Insert 7x7 Costas array in 3 places
-     itone(8:39)=sent(1:32)
-     itone(40:46)=nsync*icos7
-     itone(47:77)=sent(33:63)
-     itone(78:84)=nsync*icos7
+     if(ichk.eq.66) then
+! Experimental QRA66 (FST66?) mode
+        j=0
+        k=0
+        do i=1,85
+           if(mod(i,4).eq.1) then
+              j=j+1                      !Index for next sync symbol
+              if(j.eq.12) j=1
+              itone(i)=b11(j)            !Insert a sync symbol
+           else
+              k=k+1
+              itone(i)=sent(k) + 2
+           endif
+        enddo
+     else
+! Original QRA64 mode
+        itone(1:7)=10*icos7              !Insert 7x7 Costas array in 3 places
+        itone(8:39)=sent(1:32)
+        itone(40:46)=10*icos7
+        itone(47:77)=sent(33:63)
+        itone(78:84)=10*icos7
+     endif
   endif
 
 999 return