diff --git a/lib/fsk4hf/ft8_downsample.f90 b/lib/fsk4hf/ft8_downsample.f90
index 98544b969..791914166 100644
--- a/lib/fsk4hf/ft8_downsample.f90
+++ b/lib/fsk4hf/ft8_downsample.f90
@@ -2,7 +2,7 @@ subroutine ft8_downsample(dd,newdat,f0,c1)
 
 ! Downconvert to complex data sampled at 200 Hz ==> 32 samples/symbol
 
-  parameter (NMAX=15*12000)
+  parameter (NMAX=15*12000,NSPS=1920)
   parameter (NFFT1=192000,NFFT2=3200)      !192000/60 = 3200
   
   logical newdat
@@ -21,7 +21,7 @@ subroutine ft8_downsample(dd,newdat,f0,c1)
   endif
 
   df=12000.0/NFFT1
-  baud=12000.0/1920.0
+  baud=12000.0/NSPS
   i0=nint(f0/df)
   ft=f0+8.0*baud
   it=min(nint(ft/df),NFFT1/2)
diff --git a/lib/fsk4hf/ft8_params.f90 b/lib/fsk4hf/ft8_params.f90
index 48018b00c..8441fdb42 100644
--- a/lib/fsk4hf/ft8_params.f90
+++ b/lib/fsk4hf/ft8_params.f90
@@ -7,4 +7,5 @@ parameter (NSPS=1920)                 !Samples per symbol at 12000 S/s
 parameter (NZ=NSPS*NN)                !Samples in full 15 s waveform (151,680)
 parameter (NMAX=15*12000)             !Samples in iwave (180,000)
 parameter (NFFT1=2*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
-parameter (NHSYM=2*NMAX/NH1-1)        !Number of symbol spectra (1/2-symbol steps)
+parameter (NHSYM=2*NMAX/NH1-1)        !Number of symbol spectra (1/2-sym steps)
+parameter (NDOWN=60)                  !Downsample factor
diff --git a/lib/fsk4hf/ft8b.f90 b/lib/fsk4hf/ft8b.f90
index 789a0727a..0dc026de9 100644
--- a/lib/fsk4hf/ft8b.f90
+++ b/lib/fsk4hf/ft8b.f90
@@ -19,7 +19,7 @@ subroutine ft8b(dd0,newdat,nfqso,f1,xdt,nharderrors,dmin,nbadcrc,message,xsnr)
 
   max_iterations=40
   norder=2
-  fs2=12000.0/60.0
+  fs2=12000.0/NDOWN
   dt2=1.0/fs2
   twopi=8.0*atan(1.0)
   delfbest=0.
diff --git a/lib/fsk4hf/sync8d.f90 b/lib/fsk4hf/sync8d.f90
index eb7eeaf0f..d0d1c63b8 100644
--- a/lib/fsk4hf/sync8d.f90
+++ b/lib/fsk4hf/sync8d.f90
@@ -2,7 +2,7 @@ subroutine sync8d(cd0,i0,ctwk,itwk,sync)
 
 ! Compute sync power for a complex, downsampled FT8 signal.
 
-  parameter(NP2=2812)
+  parameter(NP2=2812,NDOWN=60)
   complex cd0(3125)
   complex csync(0:6,32)
   complex csync2(32)
@@ -19,10 +19,10 @@ subroutine sync8d(cd0,i0,ctwk,itwk,sync)
 ! Set some constants and compute the csync array.  
   if( first ) then
     twopi=8.0*atan(1.0)
-    fs2=12000.0/60.0                        !Sample rate after downsampling
+    fs2=12000.0/NDOWN                       !Sample rate after downsampling
     dt2=1/fs2                               !Corresponding sample interval
     taus=32*dt2                             !Symbol duration
-    baud=1.0/taus                             !Keying rate
+    baud=1.0/taus                           !Keying rate
     do i=0,6
       phi=0.0
       dphi=twopi*icos7(i)*baud*dt2