From f9a078dd8bf71a1312e5e90c1f7768f2623263b8 Mon Sep 17 00:00:00 2001
From: Joe Taylor <k1jt@arrl.org>
Date: Mon, 28 Nov 2016 15:11:00 +0000
Subject: [PATCH] Revert to displaying Nico's return code with QRA64 messages. 
 Suppress a few false decodes that cannot be correct messages.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7342 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
---
 CMakeLists.txt  |  1 +
 lib/badmsg.f90  | 25 +++++++++++++++++++++++++
 lib/decoder.f90 | 10 ++++------
 lib/qra64a.f90  |  1 +
 4 files changed, 31 insertions(+), 6 deletions(-)
 create mode 100644 lib/badmsg.f90

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 83b451918..738110e6f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -308,6 +308,7 @@ set (wsjt_FSRCS
   lib/avecho.f90
   lib/averms.f90
   lib/azdist.f90
+  lib/badmsg.f90
   lib/bpdecode40.f90
   lib/bpdecode144.f90
   lib/baddata.f90
diff --git a/lib/badmsg.f90 b/lib/badmsg.f90
new file mode 100644
index 000000000..56366f9d2
--- /dev/null
+++ b/lib/badmsg.f90
@@ -0,0 +1,25 @@
+subroutine badmsg(irc,dat,nc1,nc2,ng2)
+
+! Get rid of a few QRA64 false decodes that cannot be correct messages.  
+
+  integer dat(12)                           !Decoded message (as 12 integers)
+
+  ic1=ishft(dat(1),22) + ishft(dat(2),16) + ishft(dat(3),10)+         &
+       ishft(dat(4),4) + iand(ishft(dat(5),-2),15)
+
+! Test for "......" or "CQ 000"
+  if(ic1.eq.262177560 .or. ic1.eq.262177563) then
+     irc=-1
+     return
+  endif
+
+  ic2=ishft(iand(dat(5),3),26) + ishft(dat(6),20) +                   &
+       ishft(dat(7),14) + ishft(dat(8),8) + ishft(dat(9),2) +         &
+       iand(ishft(dat(10),-4),3)
+
+  ig=ishft(iand(dat(10),15),12) + ishft(dat(11),6) + dat(12)
+
+  if(ic1.eq.nc1 .and. ic2.eq.nc2 .and. ng.ne.32401 .and. ig.ne.ng) irc=-1
+
+  return
+end subroutine badmsg
diff --git a/lib/decoder.f90 b/lib/decoder.f90
index 94ccdaaf2..630e15fc8 100644
--- a/lib/decoder.f90
+++ b/lib/decoder.f90
@@ -236,10 +236,9 @@ contains
     integer, intent(in) :: nsum
     integer, intent(in) :: minsync
 
-    integer i,nft,iirc,nap(-1:11)
+    integer i,nft
     logical is_deep,is_average
     character decoded*22,csync*2,cflags*3
-    data nap/-1,0,2,3,2,3,4,2,3,6,4,6,6/
 
     if(width.eq.-9999.0) stop              !Silence compiler warning
 !$omp critical(decode_results)
@@ -249,17 +248,16 @@ contains
 
     if(ft.ge.80) then                      !QRA64 mode
        nft=ft-100
-       iirc=max(-1,min(nft,11))
        csync=': '
        if(sync.ge.float(minsync) .or. nft.ge.0) csync=':*'
        if(nft.lt.0) then
           write(*,1009) params%nutc,snr,dt,freq,csync,decoded
        else
-          write(*,1009) params%nutc,snr,dt,freq,csync,decoded,nap(iirc),nft
-1009      format(i4.4,i4,f5.1,i5,1x,a2,1x,a22,i2,i3)
+          write(*,1009) params%nutc,snr,dt,freq,csync,decoded,nft
+1009      format(i4.4,i4,f5.1,i5,1x,a2,1x,a22,i2)
        endif
        write(13,1011) params%nutc,nint(sync),snr,dt,float(freq),drift,    &
-            decoded,nap(iirc),nft
+            decoded,nft
 1011   format(i4.4,i4,i5,f6.2,f8.0,i4,3x,a22,' QRA64',i3)
        go to 100
     endif
diff --git a/lib/qra64a.f90 b/lib/qra64a.f90
index 9db64eebc..d37f17ba4 100644
--- a/lib/qra64a.f90
+++ b/lib/qra64a.f90
@@ -96,6 +96,7 @@ subroutine qra64a(dd,npts,nutc,nf1,nf2,nfqso,ntol,mode64,minsync,ndepth,   &
            call timer('qra64_de',1)
            if(abs(snr2).gt.30.) snr2=-30.0
            if(irc.eq.0) go to 10
+           if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
            if(irc.lt.0) cycle
            iirc=max(0,min(irc,11))
            if(irc.gt.0 .and. nap(iirc).le.napmin) then