diff --git a/lib/fox_sim.f90 b/lib/fox_sim.f90
index ca903813b..45a17c413 100644
--- a/lib/fox_sim.f90
+++ b/lib/fox_sim.f90
@@ -14,6 +14,7 @@ program fox_sim
   character*6 MyCall
   character*4 MyGrid
   character*8 arg
+  character*1 c1,c2,c3,c4
   integer ntot(MAXSIG),irate(MAXSIG),ntimes(MAXSIG)
   logical logit
   common/dxpfifo/nc,isnr,xcall,xgrid
@@ -53,14 +54,32 @@ program fox_sim
 
 ! Read a file with calls and grids; insert random S/N values.
 ! This is used in place of an operator-selected FIFO
-  open(10,file='xcall.txt',status='old')
+!  open(10,file='xcall.txt',status='old')
   do i=1,NCALLS
-     read(10,1000) xcall(i),xgrid(i)
-1000 format(a6,7x,a4)
+!     read(10,1000) xcall(i),xgrid(i)
+!1000 format(a6,7x,a4)
+     j=mod(i-1,26)
+     c1=char(ichar('A')+j)
+     k=mod((i-1)/26,26)
+     c2=char(ichar('A')+k)     
+     n=mod((i-1)/260,10)
+     c3=char(ichar('0')+n)     
+     xcall(i)='K'//c2//c3//c1//c1//c1
+
+     j=mod(i-1,18)
+     c1=char(ichar('A')+j)
+     k=mod((i-1)/18,18)
+     c2=char(ichar('A')+k)     
+     n=mod((i-1)/10,10)
+     c4=char(ichar('0')+n)     
+     n=mod((i-1)/100,10)
+     c3=char(ichar('0')+n)     
+     xgrid(i)=c1//c2//c3//c4
+     
      call random_number(x)
      isnr(i)=-20+int(40*x)
   enddo
-  close(10)
+!  close(10)
 
 ! Write headings for the summary file
   minutes=nseq/4
diff --git a/lib/fox_tx.f90 b/lib/fox_tx.f90
index 1eec64086..9a72b3909 100644
--- a/lib/fox_tx.f90
+++ b/lib/fox_tx.f90
@@ -16,8 +16,11 @@ subroutine fox_tx(maxtimes,fail,called,gcalled,hm,fm,ntimes,log,logit)
        g4(4:4).ge.'0' .and. g4(4:4).le.'9' .and. g4(1:4).ne.'RR73'
 
   logit=.false.
+  n=len(trim(hm))
+  g4=""
+  if(n.gt.8) g4=hm(n-3:n)
   call random_number(r)
-  if(r.lt.fail) hm=""                       !Fox failed to copy
+  if(r.lt.fail .and. .not.isgrid(g4)) hm=""        !Fox failed to copy
 
   i2=len(trim(hm))
   if(i2.gt.10) then
@@ -59,13 +62,19 @@ subroutine fox_tx(maxtimes,fail,called,gcalled,hm,fm,ntimes,log,logit)
 
   if(hm.eq.'') then
      if(fm(1:3).ne.'CQ ') then
-        if(ntimes.lt.maxtimes) then
+!        if(ntimes.lt.maxtimes) then
            ntimes=ntimes+1
-        else
+!        else
+!           ntimes=1
+! If FIFO is empty we should call CQ in this slot
+!           call dxped_fifo(cy,gy,isnry)
+!           call random_number(r)
+!           isnr=nint(-20+40*r)
+!           write(fm,1010) cy,gy,isnr
            write(fm,1010) called,MyCall,isent
 1010       format(a6,1x,a6,i4.2)
            if(fm(15:15).eq.' ') fm(15:15)='+'
-        endif
+!        endif
      endif
   endif