1. Corrected simulator so that noise and signal levels are correct in

FSK441 and JT6M, as well as JT65.  (Still no generated pings, however.)
2. Updated README_592.TXT in preparation for open release of version 5.9.2.
Updated READ


git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@97 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

README_592.TXT

@@ -8,7 +8,7 @@ Enhancements
     result is that there will be fewer audio glitches caused by the
     Windows O/S paying attention to other programs.
 
-2.  The JT65 decoder has improved immunity to "garbage data," and
+2.  The JT65 decoder now has improved immunity to "garbage data," and
     it exhibits better performance on strong signals.
 
 3.  The FSK441 decoder produces less on-screen gibberish when you do
@@ -20,21 +20,31 @@ Enhancements
 5.  On-screen font sizes can be set by using Windows Notepad (or
     another text editor) to edit the file wsjtrc.win.  If your screen
     has resolution greater than 1024 x 768, or if you have old eyes
-    like mine, you may want to increase the sizes from 8 and 9 (first
-    three lines of the file) to 9 and 10, say.
+    like mine, you may want to increase the sizes from 8 and 9 points
+    (first three lines of the file) to, say, 9 and 10 points.
 
-6.  Dividing lines are now provided on the waterfall display between
+6.  A simulator mode is now built into WSJT.  It is presently most
+    useful in JT65 mode.  By entering, say, "#-22" in the text box for
+    Tx6, you signify that the program should generate its Tx audio
+    files with the signal embedded in white gaussian noise, 22 dB
+    below the noise power in a 2.5 kHz bandwidth.  You can direct this
+    signal into a second computer running WSJT, for eaxmple to test
+    the decoder or to practice operating in JT65 mode.  You can even
+    have the two computers "work each other", although changing
+    messages of course requires operator action.
+
+7.  Dividing lines are now provided on the waterfall display between
     spectra corresponding to wave files read from disk.
 
-7.  The PTT line is explicitly set low on program startup.
+8.  The PTT line is explicitly set low on program startup.
 
-8.  The F10 key brings up the SpecJT screen (if it was hidden) and
+9.  The F10 key brings up the SpecJT screen (if it was hidden) and
     toggles foreground and focus between the WSJT and SpecJT screens.
  
-9.  You can use the Alt-F keyboard shortcut to toggle "Freeze", and
+10. You can use the Alt-F keyboard shortcut to toggle "Freeze", and
     Alt-Z to toggle "Zap".
 
-10. "Accelerated decoding" has been removed from the Setup menu.  In
+11. "Accelerated decoding" has been removed from the Setup menu.  In
     effect, it is now always ON.
 
 
@@ -53,12 +63,12 @@ Bug Fixes:
 Information for Programmers
 ---------------------------
 
-WSJT is no longer a one-person effort.  It has become a full-fledged
-Open Source project, with an active working group making contributions
-to future development.  Source code is now stored in a public
-repository under control of a version control system called
-Subversion, or SVN.  You can learn more at
-http://developer.berlios.de/projects/wsjt/.
+WSJT is no longer a one-person effort and no longer runs only in
+Microsoft Windows.  It has become a full-fledged Open Source project,
+with an active working group making contributions to future
+development.  Source code is now stored in a public repository under
+control of a version control system called Subversion, or SVN.  You
+can learn more at http://developer.berlios.de/projects/wsjt/.
 
 The first significant result of the group effort has been to create
 versions of WSJT that run under the Linux and FreeBSD operating
@@ -73,7 +83,7 @@ The present WSJT working group consists of:
     Diane Bruce, VA3DB
     James Courtier-Dutton
     Bob McGwier, N4HY
-    Stewart Nelson, KK7A
+    Stewart Nelson, KK7KA
     Joe Taylor, K1JT
     Kaj Wiik, OH6EH
 

fivehz.f90

@@ -213,13 +213,20 @@ end subroutine fivehztx
 subroutine addnoise(n)
   integer*2 n
   real r(12)
+  real*8 txsnrdb0
   include 'gcom1.f90'
+  save txsnrdb0
 
-  if(txsnrdb.gt.90.0) return
-  snr=10.0**(0.05*(txsnrdb-1))
+  if(txsnrdb.gt.40.0) return
+  if(txsnrdb.ne.txsnrdb0) then
+     snr=10.0**(0.05*(txsnrdb-1))
+     fac=3000.0
+     if(snr.gt.1.0) fac=3000.0/snr
+     txsnrdb0=txsnrdb
+  endif
   call random_number(r)
   x=sum(r)-6.0
-  i=3000.0*x + n*snr*3000.0/32768.0
+  i=fac*(x + n*snr/32768.0)
   if(i>32767) i=32767;
   if(i<-32767) i=-32767;
   n=i

jtaudio.c

@@ -137,6 +137,7 @@ static int SoundOut( void *inputBuffer, void *outputBuffer,
   short *in = (short*)inputBuffer;
   short *wptr = (short*)outputBuffer;
   unsigned int i,n;
+  static short int n2;
   static int n0;
   static int ia=0;
   static int ib=0;
@@ -167,9 +168,10 @@ static int SoundOut( void *inputBuffer, void *outputBuffer,
 
   for(i=0 ; i<framesPerBuffer; i++ )  {
     if(*data->TxOK)  {
-      addnoise_(&data->iwave[ic]);
-      *wptr++ = data->iwave[ic];        //left
-      *wptr++ = data->iwave[ic];        //right
+      n2=data->iwave[ic];
+      addnoise_(&n2);
+      *wptr++ = n2;                   //left
+      *wptr++ = n2;                   //right
       ic++;
       if(ic>=*data->nwave) {
 	ic = ic % *data->nwave;       //Wrap buffer pointer if necessary

wsjt.py

@@ -1342,13 +1342,14 @@ def update():
     if tx6.get()[:1]=='#':
         try:
             txsnrdb=float(tx6.get()[1:])
-            if txsnrdb>-99.0 and txsnrdb<10.0:
+            if txsnrdb>-99.0 and txsnrdb<40.0:
                 Audio.gcom1.txsnrdb=txsnrdb
                 tx6.configure(bg='orange')
         except:
             txsnrdb=99.0
     else:
         txsnrdb=99.0
+        Audio.gcom1.txsnrdb=txsnrdb
     if Audio.gcom2.monitoring and not Audio.gcom1.transmitting:
         bmonitor.configure(bg='green')
     else: