diff --git a/lib/fsk4hf/Makefile b/lib/fsk4hf/Makefile
index 340dd4952..9372821bc 100644
--- a/lib/fsk4hf/Makefile
+++ b/lib/fsk4hf/Makefile
@@ -18,7 +18,7 @@ CFLAGS = -O2 -I.
 %.o: %.F90
 	${FC} ${FFLAGS} -c $<
 
-all:	fsk4sim
+all:	wsprlf
 
 OBJS0 = testpsk.o four2a.o bpfilter.o nonlinear.o tweak1.o spectrum.o smo.o
 testpsk: $(OBJS0)
@@ -40,7 +40,11 @@ OBJS4 = fsk4sim.o four2a.o wavhdr.o gran.o tweak1.o
 fsk4sim: $(OBJS4)
 	$(FC) -o fsk4sim $(OBJS4) -lfftw3f
 
+OBJS5 = wsprlf.o four2a.o
+wsprlf:	$(OBJS5)
+	$(FC) -o wsprlf $(OBJS5) -lfftw3f
+
 .PHONY : clean
 
 clean:
-	$(RM) *.o testpsk testfsk fsk2sim fsk4sim
+	$(RM) *.o testpsk testfsk fsk2sim fsk4sim wsprlf
diff --git a/lib/fsk4hf/wsprlf.f90 b/lib/fsk4hf/wsprlf.f90
new file mode 100644
index 000000000..803f3c027
--- /dev/null
+++ b/lib/fsk4hf/wsprlf.f90
@@ -0,0 +1,111 @@
+program wsprlf
+
+  parameter (NN=121)                    !Total symbols
+!  parameter (NSPS=28672)                !Samples per symbol
+  parameter (NSPS=28800)                !Samples per symbol
+  parameter (NZ=NSPS*NN)                !Samples in waveform
+  parameter (NFFT=11*NSPS)
+
+  character*8 arg
+  complex c(0:NZ-1)
+  complex ct(0:NFFT-1)
+  real*8 twopi,f0,dt,phi,dphi
+  real s(0:NZ-1)
+  real h0(0:NSPS/2)
+  real h1(0:NSPS/2)
+  real p(0:NFFT-1)
+  real tmp(NN)
+  integer id(NN)
+
+  nargs=iargc()
+  if(nargs.ne.2) then
+     print*,'Usage: wsprlf f0 t1'
+     goto 999
+  endif
+  call getarg(1,arg)
+  read(arg,*) f0
+  call getarg(2,arg)
+  read(arg,*) t1
+
+  call random_number(tmp)          !Generate random data
+  id=0
+  where(tmp.ge.0.5) id=1
+  id(1)=0
+
+  n1=nint(t1*NSPS)
+  twopi=8.d0*atan(1.d0)
+
+  do i=0,2*n1-1
+     if(i.le.n1-1) then
+        h0(i)=0.5*(1.0-cos(0.5*i*twopi/n1))
+     else
+        h1(i-n1)=0.5*(1.0-cos(0.5*i*twopi/n1))
+     endif
+  enddo
+  if(t1.eq.0.0) h0=1
+  if(t1.eq.0.0) h1=1
+
+  s=1.
+  s(0:n1-1)=h0(0:n1-1)           !Leading edge of 1st pulse
+  do j=2,NN                      !Leading edges
+     if(id(j).ne.id(j-1)) then
+        ia=(j-1)*NSPS + 1
+        ib=ia+n1-1
+        s(ia:ib)=h0(0:n1-1)
+     endif
+  enddo
+  do j=1,NN-1                    !Trailing edges
+     if(id(j+1).ne.id(j)) then
+        ib=j*NSPS
+        ia=ib-n1+1
+        s(ia:ib)=h1(0:n1-1)
+     endif
+  enddo
+  ib=NN*NSPS-1
+  ia=ib-n1+1
+  s(ia:ib)=h1(0:n1-1)           !Trailing edge of last pulse
+
+  dt=1.d0/12000.d0
+  ts=dt*NSPS
+  baud=12000.0/NSPS
+  write(*,1000) baud,ts
+1000 format('Baud:',f6.3,'  Tsym:',f6.3)
+  phi=0.
+  dphi=twopi*f0*dt
+  i=-1
+  do j=1,NN
+     x=1.
+     if(id(j).eq.1) x=-1.
+     do k=1,NSPS
+        i=i+1
+        phi=phi+dphi
+        if(phi.gt.twopi) phi=phi-twopi
+        c(i)=x*s(i)*cmplx(cos(phi),sin(phi))
+        t=i*dt
+        sym=t/ts
+        if(sym.ge.10.0 .and. sym.le.20.0) write(13,3001) t,   &
+             sym,s(i),c(i)
+3001    format(5f12.6,i10)
+     enddo
+  enddo
+
+  p=0.
+  do iblk=1,11
+     ia=(iblk-1)*NFFT
+     ib=ia+NFFT-1
+     ct=c(ia:ib)
+     call four2a(ct,NFFT,1,-1,1)
+     do i=0,NFFT-1
+        p(i)=p(i) + real(ct(i))**2 + aimag(ct(i))**2
+     enddo
+  enddo
+     
+  p=cshift(p,NFFT/2)/maxval(p)
+  df=12000.0/NFFT
+  do i=0,NFFT-1
+     f=i*df - 6000.0
+     write(14,1020) f,p(i),10.0*log10(p(i)+1.e-12)
+1020 format(f12.4,2e12.3)
+  enddo
+
+999 end program wsprlf