From c8afc2da11209694c94fe89eea33cce7436cf734 Mon Sep 17 00:00:00 2001
From: Joe Taylor <k1jt@arrl.org>
Date: Mon, 24 Jul 2006 14:30:15 +0000
Subject: [PATCH] fivehz.F90: Added function gran() wsjt1.F:    Option to
 intentionally degrade SNR for test purposes deep65.F:   Tweaked parameters
 for computing qual

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@200 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
---
 deep65.F   | 17 ++++++-----------
 fivehz.F90 | 17 +++++++++++++----
 wsjt.py    |  2 +-
 wsjt1.F    | 18 +++++++++++++++++-
 4 files changed, 37 insertions(+), 17 deletions(-)

diff --git a/deep65.F b/deep65.F
index 9e9e8830b..69a1cb5bf 100644
--- a/deep65.F
+++ b/deep65.F
@@ -73,7 +73,8 @@
          callgrid(icall)=callsign(1:j2)
 
          mz=1
-         if(n.eq.1 .and. j3.lt.1 .and. j4.lt.1) mz=MAXRPT+1
+         if(n.eq.1 .and. j3.lt.1 .and. j4.lt.1 .and.
+     +      flip.gt.0.0) mz=MAXRPT+1
          do m=1,mz
             if(m.gt.1) grid=rpt(m-1)
             if(j3.lt.1 .and.j4.lt.1) 
@@ -135,25 +136,19 @@ C  If sync=OOO, no CQ messages
          if(pp(ntot-i).ne.pp(ntot)) go to 40
       enddo
  40   iref=min(ntot-i,nint(0.68*ntot))
-      pbias=1.04*pp(ntot-i)
-!      pbias=1.40*pp(iref)
-      qual=50.0*(p1-pbias)
+      pbias=1.08*pp(ntot-i)
+      qual=100.0*(p1-pbias)
+
 !      if(mode65.eq.1) qual=100.0*(p1-0.335)
 !      if(mode65.eq.4) qual=100.0*(p1-0.505)
       decoded='                      '
       c=' '
 
       if(qual.gt.1.0) then
-         if(qual.lt.4.0) c='?'
+         if(qual.lt.6.0) c='?'
          decoded=testmsg(ip1)
       endif
       decoded(22:22)=c
-
-!      write(71,1010) mycall,qual,nhard1,p1,p1/pp(ntot-i),
-!     +  p1/pp(iref),nint(sum1),nint(ref0),nint(ref1),i,decoded
-!      write(*,1010) mycall,qual,nhard1,p1,p1/pp(ntot-i),
-!     +  p1/pp(iref),nint(sum1),nint(ref0),nint(ref1),i,decoded
-! 1010 format(a6,f6.1,i3,f6.3,2f6.2,4i5,1x,a22)
       if(qual.lt.0.) qual=0.
       if(qual.gt.10.) qual=10.
 
diff --git a/fivehz.F90 b/fivehz.F90
index c18e70a1b..2fd15acc3 100644
--- a/fivehz.F90
+++ b/fivehz.F90
@@ -212,9 +212,9 @@ end subroutine fivehztx
 
 subroutine addnoise(n)
   integer*2 n
-  real r(12)
   real*8 txsnrdb0
   include 'gcom1.f90'
+  data idum/0/
   save
 
   if(txsnrdb.gt.40.0) return
@@ -224,9 +224,7 @@ subroutine addnoise(n)
      if(snr.gt.1.0) fac=3000.0/snr
      txsnrdb0=txsnrdb
   endif
-  call random_number(r)
-  x=sum(r)-6.0
-  i=fac*(x + n*snr/32768.0)
+  i=fac*(gran(idum) + n*snr/32768.0)
   if(i>32767) i=32767;
   if(i<-32767) i=-32767;
   n=i
@@ -234,3 +232,14 @@ subroutine addnoise(n)
   return
 end subroutine addnoise
 
+real function gran(idum)
+  real r(12)
+  integer nseed(1)
+  data nseed/714478811/
+  if(idum.lt.0) then
+     call random_seed(PUT=nseed)
+     idum=0
+  endif
+  call random_number(r)
+  gran=sum(r)-6.0
+end function gran
diff --git a/wsjt.py b/wsjt.py
index fe59afdeb..d258710eb 100644
--- a/wsjt.py
+++ b/wsjt.py
@@ -1,4 +1,4 @@
-#------------------------------------------------------------------ WSJT
+#------------------------------------------------------------------- WSJT
 from Tkinter import *
 from tkFileDialog import *
 import Pmw
diff --git a/wsjt1.F b/wsjt1.F
index 9f8d6e210..f5e6c3d8a 100644
--- a/wsjt1.F
+++ b/wsjt1.F
@@ -90,7 +90,7 @@
 	if(mode.eq.4 .and. jz.gt.330750) jz=330750	!### Fix this!
 
 	sum=0.
-	do j=1,jz            !Convert raw data from byte to real, remove DC
+	do j=1,jz            !Convert raw data from i*2 to real, remove DC
            dat(j)=0.1*d(j)
 	   sum=sum + dat(j)
 	enddo
@@ -112,6 +112,21 @@
 
 	endif
 
+	if(ndiag.ne.0 .and. nclip.lt.0) then
+C  Intentionally degrade SNR by -nclip dB.
+	   sq=0.
+	   do i=1,jz
+	      sq=sq + dat(i)**2
+	   enddo
+	   p0=sq/jz
+	   p1=p0*10.0**(-0.1*nclip)
+	   dnoise=sqrt(p1-p0)
+	   idum=-1
+	   do i=1,jz
+	      dat(i)=dat(i) + dnoise*gran(idum)
+	   enddo
+	endif
+
 	if(mode.ne.2 .and. nzap.ne.0) then
 	   if(jz.gt.100000) call avesp2(dat,jz,2,f0a,NFreeze,MouseDF,
      +         DFTolerance,fzap)
@@ -306,3 +321,4 @@ C  Now the multi-tone decoding
 
  	return
  	end
+