diff --git a/lib/wsprd/osdwspr.f90 b/lib/wsprd/osdwspr.f90
index 26069eb14..42b8e949c 100644
--- a/lib/wsprd/osdwspr.f90
+++ b/lib/wsprd/osdwspr.f90
@@ -18,25 +18,12 @@ integer indx(N),ndeep,nhardmin
 real rx(N),absrx(N),dmin
 logical first,reset
 data first/.true./
-!data p1/1,0,0,0,1,1,0,0,0,0,1,0,0,0,1,0,1,1,0,0,1,1,1,0,1/
-!data p2/1,0,1,0,1,0,1,1,0,0,1,0,0,1,0,1,0,0,1,0,0,1,1,1,1/
-!data p3/1,1,0,1,0,1,0,1,1,0,1,0,0,1,1,0,1,1,1,1,1,1,0,1,1/
-!data p4/1,1,1,0,1,1,1,1,0,1,1,1,0,0,0,1,1,1,1,1,1,0,0,0,1/
-!data p1/1,0,1,0,1,1,0,0,1,1,0,1,1,1,1,1/
-!data p2/1,0,1,1,0,1,0,0,1,1,1,1,1,0,0,1/
-!data p3/1,1,0,0,1,0,1,1,0,1,1,1,0,0,1,1/
-!data p4/1,1,1,0,1,1,0,1,1,1,1,0,0,1,0,1/
 data gg/1,1,0,1,0,1,0,0,1,0,0,0,1,1,0,0,1,0,1,0,0,1,0,1,1,1,0,1,1,0,0,0, &
         0,1,0,0,0,0,0,0,1,0,0,1,1,1,1,0,0,0,1,0,0,1,0,0,1,0,1,1,1,1,1,1/
 
 save first,gen
 
 if( first ) then ! fill the generator matrix
-!  gg=0
-!  gg(1:L)=p1
-!  gg(L+1:2*L)=p2
-!  gg(2*L+1:3*L)=p3
-!  gg(3*L+1:4*L)=p4
   gen=0
   gen(1,1:2*L)=gg(1:2*L)
   do i=2,K
@@ -45,7 +32,6 @@ if( first ) then ! fill the generator matrix
   first=.false.
 endif
 
-! Re-order received vector to place systematic msg bits at the end.
 rx=ss/127.0
 apmaskr=apmask
 
@@ -111,41 +97,41 @@ cw=c0
 ntotal=0
 nrejected=0
 
-if(ndeep.eq.0) goto 998  ! norder=0
+if(ndeep.le.0) goto 998  ! norder=0
 if(ndeep.gt.5) ndeep=5
 if( ndeep.eq. 1) then
    nord=1
    npre1=0
    npre2=0
-   nt=60
-   ntheta=12
+   nt=66
+   ntheta=16
 elseif(ndeep.eq.2) then
    nord=1
    npre1=1
    npre2=0
-   nt=60
-   ntheta=12
+   nt=66
+   ntheta=16
 elseif(ndeep.eq.3) then
-   nord=1
+   nord=2
    npre1=1
-   npre2=1
-   nt=60
+   npre2=0
+   nt=66
    ntheta=22
    ntau=16
 elseif(ndeep.eq.4) then
    nord=2
    npre1=1
-   npre2=0
-   nt=60
+   npre2=1
+   nt=66
    ntheta=22
    ntau=16
 elseif(ndeep.eq.5) then
    nord=3
    npre1=1
-   npre2=1
-   nt=60
+   npre2=0
+   nt=66
    ntheta=22
-   ntau=16
+   ntau=20
 endif
 
 do iorder=1,nord
diff --git a/lib/wsprd/wsprd.c b/lib/wsprd/wsprd.c
index fc5b7e8ed..024afaa48 100644
--- a/lib/wsprd/wsprd.c
+++ b/lib/wsprd/wsprd.c
@@ -693,6 +693,7 @@ void usage(void)
     printf("       -H do not use (or update) the hash table\n");
     printf("       -J use the stack decoder instead of Fano decoder\n");
     printf("       -m decode wspr-15 .wav file\n");
+    printf("       -o n (0<=n<=5), decoding depth for OSD, default is disabled\n");
     printf("       -q quick mode - doesn't dig deep for weak signals\n");
     printf("       -s single pass mode, no subtraction (same as original wsprd)\n");
     printf("       -v verbose mode (shows dupes)\n");
@@ -771,7 +772,7 @@ int main(int argc, char *argv[])
     int block_demod=1;                       //Default is to use block demod on pass 2
     int subtraction=1;
     int npasses=2;
-    int ndepth=3;                            //Depth for OSD 
+    int ndepth=-1;                            //Depth for OSD 
 
     float minrms=52.0 * (symfac/64.0);      //Final test for plausible decoding
     delta=60;                                //Fano threshold step
@@ -786,7 +787,7 @@ int main(int argc, char *argv[])
     idat=calloc(maxpts,sizeof(float));
     qdat=calloc(maxpts,sizeof(float));
     
-    while ( (c = getopt(argc, argv, "a:BcC:de:f:HJmoqstwvz:")) !=-1 ) {
+    while ( (c = getopt(argc, argv, "a:BcC:de:f:HJmo:qstwvz:")) !=-1 ) {
         switch (c) {
             case 'a':
                 data_dir = optarg;
@@ -820,7 +821,7 @@ int main(int argc, char *argv[])
                 wspr_type = 15;
                 break;
             case 'o':  //use ordered-statistics-decoder
-                use_osd = 1;
+                ndepth=(int) strtol(optarg,NULL,10);
                 break;
             case 'q':  //no shift jittering
                 quickmode = 1;
@@ -1291,12 +1292,11 @@ int main(int argc, char *argv[])
 
                         tfano += (float)(clock()-t0)/CLOCKS_PER_SEC;
 
-                        if( use_osd && not_decoded ) { 
-                            int ndeep=5;
+                        if( (ndepth >= 0) && not_decoded ) { 
                             for(i=0; i<162; i++) {
                                 fsymbs[i]=symbols[i]-127;
                             }
-                            osdwspr_(fsymbs,apmask,&ndeep,cw,&nhardmin,&dmin);
+                            osdwspr_(fsymbs,apmask,&ndepth,cw,&nhardmin,&dmin);
                             for(i=0; i<162; i++) {
                                symbols[i]=255*cw[i];
                             }
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 8ae8b9463..7fd49db9a 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1379,7 +1379,7 @@ void MainWindow::dataSink(qint64 frames)
       t2.sprintf(" -f %.6f ",f0m1500);
       if((m_ndepth&7)==1) depth_string=" -qB "; //2 pass w subtract, no Block detection, no shift jittering
       if((m_ndepth&7)==2) depth_string=" -B ";  //2 pass w subtract, no Block detection
-      if((m_ndepth&7)==3) depth_string=" -o";   //2 pass w subtract, Block detection and OSD. 
+      if((m_ndepth&7)==3) depth_string=" -C 5000 -o 4";   //2 pass w subtract, Block detection and OSD. 
       QString degrade;
       degrade.sprintf("-d %4.1f ",m_config.degrade());