First cut at setting up Fast/Normal/Deep parameters.

lib/ft8/bpdecode174_91.f90

@@ -1,4 +1,4 @@
-subroutine bpdecode174_91(llr,apmask,maxiterations,message77,cw,nharderror,iter)
+subroutine bpdecode174_91(llr,apmask,maxiterations,message77,cw,nharderror,iter,ncheck)
 !
 ! A log-domain belief propagation decoder for the (174,91) code.
 !
@@ -76,6 +76,7 @@ do iter=0,maxiterations
 !    write(*,*) iter,ncheck,nd,ncnt
     if( ncnt .ge. 5 .and. iter .ge. 10 .and. ncheck .gt. 15) then
       nharderror=-1
+
       return
     endif
   endif

lib/ft8/ft8b.f90

@@ -261,7 +261,7 @@ subroutine ft8b(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,nzhsym,lapon,     &
   else
      npasses=4
   endif
-  if(nzhsym.lt.50) npasses=3
+  if(nzhsym.lt.50) npasses=4
   
   do ipass=1,npasses 
      llrz=llra
@@ -402,11 +402,11 @@ subroutine ft8b(dd0,newdat,nQSOProgress,nfqso,nftx,ndepth,nzhsym,lapon,     &
      cw=0
      call timer('bpd174_91 ',0)
      call bpdecode174_91(llrz,apmask,max_iterations,message77,cw,nharderrors,  &
-          niterations)
+          niterations,ncheck)
      call timer('bpd174_91 ',1)
      dmin=0.0
-     if(ndepth.ge.2 .and. nharderrors.lt.0) then
-        ndeep=3
+     if(nharderrors.lt.0 .and. ncheck.le.30 .and. ndepth.ge.2) then
+        ndeep=ndepth
         if(abs(nfqso-f1).le.napwid .or. abs(nftx-f1).le.napwid .or. ncontest.eq.7) then
            ndeep=4  
         endif

lib/ft8_decode.f90

@@ -124,24 +124,26 @@ contains
     endif
 
 ! For now:
-! ndepth=1: no subtraction, 1 pass, belief propagation only
+! ndepth=1: subtraction, 3 passes, bp (no subtract refinement) 
 ! ndepth=2: subtraction, 3 passes, bp+osd (no subtract refinement) 
 ! ndepth=3: subtraction, 3 passes, bp+osd
-    if(ndepth.eq.1) npass=1
-    if(ndepth.ge.2) npass=3
+    npass=3
     do ipass=1,npass
       newdat=.true.
       syncmin=1.3
       if(ipass.eq.1) then
         lsubtract=.true.
-        if(ndepth.eq.1) lsubtract=.false.
+        ndeep=ndepth
+        if(ndepth.eq.3) ndeep=2
       elseif(ipass.eq.2) then
         n2=ndecodes
         if(ndecodes.eq.0) cycle
         lsubtract=.true.
+        ndeep=ndepth
       elseif(ipass.eq.3) then
         if((ndecodes-n2).eq.0) cycle
         lsubtract=.true. 
+        ndeep=3
       endif 
       call timer('sync8   ',0)
       maxc=MAXCAND
@@ -154,7 +156,7 @@ contains
         xdt=candidate(2,icand)
         xbase=10.0**(0.1*(sbase(nint(f1/3.125))-40.0))
         call timer('ft8b    ',0)
-        call ft8b(dd,newdat,nQSOProgress,nfqso,nftx,ndepth,nzhsym,lft8apon, &
+        call ft8b(dd,newdat,nQSOProgress,nfqso,nftx,ndeep,nzhsym,lft8apon, &
              lapcqonly,napwid,lsubtract,nagain,ncontest,iaptype,mycall12,   &
              hiscall12,sync,f1,xdt,xbase,apsym2,aph10,nharderrors,dmin,     &
              nbadcrc,iappass,iera,msg37,xsnr,itone)
@@ -165,7 +167,6 @@ contains
         if(nbadcrc.eq.0) then
            ldupe=.false.
            do id=1,ndecodes
-!              if(msg37.eq.allmessages(id).and.nsnr.le.allsnrs(id)) ldupe=.true.
               if(msg37.eq.allmessages(id)) ldupe=.true.
            enddo
            if(.not.ldupe) then