diff --git a/CMakeLists.txt b/CMakeLists.txt
index ca25c3a08..04776905e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -595,6 +595,21 @@ set (wsjt_FSRCS
   lib/wqencode.f90
   lib/wspr_downsample.f90
   lib/zplot9.f90
+  lib/fst280/bpdecode280_101.f90
+  lib/fst280/bpdecode280_74.f90
+  lib/fst280/decode280_101.f90
+  lib/fst280/decode280_74.f90
+  lib/fst280/encode280_101.f90
+  lib/fst280/encode280_74.f90
+  lib/fst280/fst280d.f90
+  lib/fst280/fst280sim.f90
+  lib/fst280/genfst280_wave.f90
+  lib/fst280/genfst280.f90
+  lib/fst280/get_ft280_bitmetrics.f90
+  lib/fst280/ldpcsim280_101.f90
+  lib/fst280/ldpcsim280_74.f90
+  lib/fst280/osd280_101.f90
+  lib/fst280/osd280_74.f90
   )
 
 # temporary workaround for a gfortran v7.3 ICE on Fedora 27 64-bit
@@ -1351,6 +1366,18 @@ target_link_libraries (ft4sim_mult wsjt_fort wsjt_cxx)
 add_executable (record_time_signal Audio/tools/record_time_signal.cpp)
 target_link_libraries (record_time_signal wsjt_cxx wsjt_qtmm wsjt_qt)
 
+add_executable (fst280d lib/fst280/fst280d.f90 wsjtx.rc)
+target_link_libraries (fst280d wsjt_fort wsjt_cxx)
+
+add_executable (fst280sim lib/fst280/fst280sim.f90 wsjtx.rc)
+target_link_libraries (fst280sim wsjt_fort wsjt_cxx)
+
+add_executable (ldpcsim280_101 lib/fst280/ldpcsim280_101.f90 wsjtx.rc)
+target_link_libraries (ldpcsim280_101 wsjt_fort wsjt_cxx)
+
+add_executable (ldpcsim280_74 lib/fst280/ldpcsim280_74.f90 wsjtx.rc)
+target_link_libraries (ldpcsim280_74 wsjt_fort wsjt_cxx)
+
 endif(WSJT_BUILD_UTILS)
 
 # build the main application
diff --git a/lib/fst280/gen_fst280wave.f90 b/lib/fst280/gen_fst280wave.f90
new file mode 100644
index 000000000..dcf11ff4d
--- /dev/null
+++ b/lib/fst280/gen_fst280wave.f90
@@ -0,0 +1,72 @@
+subroutine gen_fst280wave(itone,nsym,nsps,nwave,fsample,hmod,f0,icmplx,cwave,wave)
+
+  real wave(nwave)
+  complex cwave(nwave)
+  real, allocatable, save :: pulse(:)
+  real, allocatable :: dphi(:)
+  integer itone(nsym)
+  logical first
+  data first/.true./
+  save first,twopi,dt,tsym
+
+  if(first) then
+     allocate( pulse(3*nsps*fsample) )
+     twopi=8.0*atan(1.0)
+     dt=1.0/fsample
+     tsym=nsps/fsample
+! Compute the smoothed frequency-deviation pulse
+     do i=1,3*nsps
+        tt=(i-1.5*nsps)/real(nsps)
+        pulse(i)=gfsk_pulse(2.0,tt)
+     enddo
+     first=.false.
+  endif
+
+! Compute the smoothed frequency waveform.
+! Length = (nsym+2)*nsps samples, zero-padded
+  allocate( dphi(0:(nsym+2)*nsps-1) )
+  dphi_peak=twopi*hmod/real(nsps)
+  dphi=0.0 
+  do j=1,nsym        
+     ib=(j-1)*nsps
+     ie=ib+3*nsps-1
+     dphi(ib:ie) = dphi(ib:ie) + dphi_peak*pulse(1:3*nsps)*itone(j)
+  enddo
+
+! Calculate and insert the audio waveform
+  phi=0.0
+  dphi = dphi + twopi*(f0-1.5*hmod/tsym)*dt                          !Shift frequency up by f0
+  wave=0.
+  if(icmplx.eq.1) cwave=0.
+  k=0
+  do j=0,(nsym+2)*nsps-1
+     k=k+1
+     if(icmplx.eq.0) then
+        wave(k)=sin(phi)
+     else
+        cwave(k)=cmplx(cos(phi),sin(phi))
+     endif
+     phi=mod(phi+dphi(j),twopi)
+  enddo
+
+! Compute the ramp-up and ramp-down symbols
+  if(icmplx.eq.0) then
+     wave(1:nsps/2)=0.0
+     wave(nsps/2+1:nsps)=wave(nsps/2+1:nsps) *                                &
+          (1.0-cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
+     k1=(nsym+1)*nsps+1
+     wave(k1+nsps/2:)=0.0
+     wave(k1:k1+nsps/2-1)=wave(k1:k1+nsps/2-1) *                              &
+          (1.0+cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
+  else
+     cwave(1:nsps/2)=0.0
+     cwave(nsps/2+1:nsps)=cwave(nsps/2+1:nsps) *                               &
+          (1.0-cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
+     k1=(nsym+1)*nsps+1
+     cwave(k1+nsps/2:)=0.0
+     cwave(k1:k1+nsps/2-1)=cwave(k1:k1+nsps/2-1) *                              &
+          (1.0+cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
+  endif
+
+  return
+end subroutine gen_fst280wave