diff --git a/CMakeLists.txt b/CMakeLists.txt
index dd0860c60..79c8302e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -462,6 +462,7 @@ set (wsjt_FSRCS
   lib/ft8/genft8.f90
   lib/genmsk_128_90.f90
   lib/genmsk40.f90
+  lib/fsk4hf/genft2.f90
   lib/fsk4hf/genft4.f90
   lib/genqra64.f90
   lib/ft8/genft8refsig.f90
diff --git a/lib/fsk4hf/ft4d.f90 b/lib/fsk4hf/ft4d.f90
index 22c81cec8..ba5a717ef 100644
--- a/lib/fsk4hf/ft4d.f90
+++ b/lib/fsk4hf/ft4d.f90
@@ -106,7 +106,7 @@ program ft4d
         ibest=-1
         sybest=-99.
         dfbest=-1.
-        do if=-60,+60
+        do if=-30,+30
            df=if
            a=0.
            a(1)=-df
@@ -115,7 +115,7 @@ program ft4d
               csync1=0.
               cterm=1
               do ib=1,12
-                 i1=(ib-1)*10+is
+                 i1=(ib-1)*20+is
                  if(s12(ib).eq.0) then
                     csync1=csync1+sum(cb(i1:i1+19)*conjg(c0(0:19)))*cterm
                     cterm=cterm*cc0