diff --git a/Configuration.ui b/Configuration.ui
index eab8dce00..dc35b5b39 100644
--- a/Configuration.ui
+++ b/Configuration.ui
@@ -2242,6 +2242,9 @@ Right click for insert and delete options.</string>
             </item>
             <item row="2" column="0">
              <widget class="QCheckBox" name="cbx2ToneSpacing">
+              <property name="toolTip">
+               <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Generate Tx audio with twice the normal tone spacing.  Intended for special LF/MF transmitters that use a divide-by-2 before generating RF.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+              </property>
               <property name="text">
                <string>x 2 Tone Spacing</string>
               </property>
@@ -2503,12 +2506,12 @@ soundcard changes</string>
   </connection>
  </connections>
  <buttongroups>
-  <buttongroup name="CAT_stop_bits_button_group"/>
-  <buttongroup name="CAT_data_bits_button_group"/>
   <buttongroup name="CAT_handshake_button_group"/>
+  <buttongroup name="TX_mode_button_group"/>
   <buttongroup name="split_mode_button_group"/>
   <buttongroup name="TX_audio_source_button_group"/>
+  <buttongroup name="CAT_stop_bits_button_group"/>
   <buttongroup name="PTT_method_button_group"/>
-  <buttongroup name="TX_mode_button_group"/>
+  <buttongroup name="CAT_data_bits_button_group"/>
  </buttongroups>
 </ui>
diff --git a/about.cpp b/about.cpp
index db00ca989..1a1eef541 100644
--- a/about.cpp
+++ b/about.cpp
@@ -20,9 +20,9 @@ CAboutDlg::CAboutDlg(QWidget *parent) :
                          "weak-signal Amateur Radio communication.  <br /><br />"
                          "&copy; 2001-2016 by Joe Taylor, K1JT, with grateful <br />"
                          "acknowledgment for contributions from AC6SL, AE4JY, <br />"
-                         "DJ0OT, G4KLA, G4WJS, IV3NWV, IW3RAB, K3WYC, K9AN, KA6MAL, <br />"
-                         "KA9Q, KB1ZMX, KD6EKQ, KI7MT, KK1D, ND0B, PY2SDR, <br />"
-                         "VK3ACF, VK4BDJ, W4TI, W4TV, and W9MDB.<br /><br />"
+                         "DJ0OT, G3WDG, G4KLA, G4WJS, IV3NWV, IW3RAB, K3WYC, K9AN, <br />"
+                         "KA6MAL, KA9Q, KB1ZMX, KD6EKQ, KI7MT, KK1D, ND0B, PY2SDR, <br />"
+                         "VK3ACF, VK4BDJ, VK7MO, W4TI, W4TV, and W9MDB.<br /><br />"
                          "WSJT-X is licensed under the terms of Version 3 <br />"
                          "of the GNU General Public License (GPL) <br />"
                          "<a href=" WSJTX_STRINGIZE (PROJECT_HOMEPAGE) ">"
diff --git a/lib/detectmsk40.f90 b/lib/detectmsk40.f90
index bb052bdc8..9c833542c 100644
--- a/lib/detectmsk40.f90
+++ b/lib/detectmsk40.f90
@@ -363,7 +363,10 @@ subroutine detectmsk40(cbig,n,pchk_file,mycall,hiscall,lines,nmessages,   &
               softbits=softbits/ssig
 
               sigma=0.75
-!             if( xsnr .lt. -4.0 ) sigma=0.8
+!              if(xsnr.lt.-2.0 ) sigma=0.8
+!              if(xsnr.lt.-3.0 ) sigma=0.95
+!              if(xsnr.lt.-4.0 ) sigma=1.1
+              if(xsnr.lt.1.5) sigma=1.1 - 0.14*(xsnr+4.0) 
               lratio(1:32)=exp(2.0*softbits(9:40)/(sigma*sigma))
 
               max_iterations=5
diff --git a/mainwindow.cpp b/mainwindow.cpp
index ec3bcf5a9..a980d5a48 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -845,20 +845,28 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   }
 
   statusChanged();
-/*
-//### The following is temporary ###
-  {
-    QString t=m_config.my_callsign();
-    if(t!="IV3NWV" and t!="K1JT" and t!="K9AN" and t!="G4WJS" and
-       t!="IW0HDV" and t!="VE1SKY" and t!="KI7MT" and t!="W8WN" and
-       t!="G4SWX" and t!="G3WDG" and t!="VK7MO") {
-      ui->actionQRA64->setChecked(false);
-      ui->actionQRA64->setEnabled(false);
-      ui->actionMSK144->setChecked(false);
-      ui->actionMSK144->setEnabled(false);    }
-  }
+
+//### TEMPORARY MESSAGE TO USERS ###
+  MessageBox::information_message (this,
+        "<h2>" + QString {"Alpha Release: WSJT-X v" +
+        QCoreApplication::applicationVersion() + " " +
+        revision ()}.simplified () + "</h2>"
+        "V1.7 has many new features, most aimed at VHF/UHF/Microwave users.<br />"
+        "Some are not yet described in the User Guide and may not be thoroughly<br />"
+        "tested. Click on the link at bottom for a brief description.<br /><br />"
+        "As a test user you have an obligation to report anomalous results<br />"
+        "to the development team.  We are particularly interested in tests<br />"
+        "of experimental modes QRA64 (intended for EME) and MSK144<br />"
+        "(intended for meteor scatter).<br /><br />"
+        "Send reports to wsjtgroup@yahoogroups.com, and be sure to save .wav<br />"
+        "files where appropriate.<br /><br />"
+        "<a href=" WSJTX_STRINGIZE (PROJECT_HOMEPAGE) ">"
+        "<img src=\":/icon_128x128.png\" /></a>"
+        "<a href=\"http://physics.princeton.edu/pulsar/k1jt/v1.7_Features.txt\">"
+        "<img src=\":/gpl-v3-logo.svg\" height=\"80\" /><br />"
+        "http://physics.princeton.edu/pulsar/k1jt/v1.7_Features.txt</a>");
 //###
-*/
+
   m_wideGraph->setMode(m_mode);
   m_wideGraph->setModeTx(m_modeTx);
 
diff --git a/mainwindow.ui b/mainwindow.ui
index 13ff36d47..3583cc856 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -2,6 +2,14 @@
 <ui version="4.0">
  <class>MainWindow</class>
  <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>896</width>
+    <height>565</height>
+   </rect>
+  </property>
   <property name="windowTitle">
    <string>WSJT-X   by K1JT</string>
   </property>
@@ -2276,6 +2284,14 @@ QPushButton[state=&quot;ok&quot;] {
    </layout>
   </widget>
   <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>896</width>
+     <height>21</height>
+    </rect>
+   </property>
    <widget class="QMenu" name="menuFile">
     <property name="title">
      <string>File</string>
@@ -2500,7 +2516,7 @@ QPushButton[state=&quot;ok&quot;] {
     <bool>true</bool>
    </property>
    <property name="enabled">
-    <bool>true</bool>
+    <bool>false</bool>
    </property>
    <property name="text">
     <string>Save decoded</string>
diff --git a/v1.7_Features.txt b/v1.7_Features.txt
new file mode 100644
index 000000000..deb09e8eb
--- /dev/null
+++ b/v1.7_Features.txt
@@ -0,0 +1,13 @@
+		New Features in WSJT-X Version 1.7
+		----------------------------------
+
+1.  New modes: ISCAT, JTMSK, MSK144, QRA64
+2.  Newly implemented submodes: JT65B-C, JT9B-H (wide and fast)
+3.  FT decoder replaces KV decoder for JT65; KVASD is no longer used.
+4.  Improvements to JT4, JT9, and JT65 decoders.
+5.  Multi-pass decoding for JT9, JT65 and WSPR.
+6.  Many improvements to Rig Control.
+7.  Improved convenience features for EME Doppler tracking.
+8.  Multiple configurations can be saved and restored.
+9.  Sample-file download facility.
+10. Optional auto-sequencing for "fast" modes.