Here's a start on GUI changes to support FST240W as well as FST240.

lib/decoder.f90

@@ -189,6 +189,9 @@ subroutine multimode_decoder(ss,id2,params,nfsample)
 
   if(params%nmode.eq.240) then
 ! We're in FST240/FST240W mode
+     ndepth=iand(params%ndepth,3)
+     iwspr=0
+     if(iand(params%ndepth,128).ne.0) iwspr=2
      call timer('dec240  ',0)
      call my_fst240%decode(fst240_decoded,id2,params%nutc,                &
           params%nQSOProgress,params%nfqso,params%nfa,params%nfb,         &

lib/fst240_decode.f90

@@ -155,7 +155,6 @@ contains
    hmod=2**nsubmode
    if(nfqso+nqsoprogress.eq.-999) return
    Keff=91
-   iwspr=1
    nmax=15*12000
    single_decode=iand(nexp_decode,32).eq.32
    if(ntrperiod.eq.15) then

widgets/mainwindow.cpp

@@ -953,6 +953,7 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   ui->actionInclude_averaging->setChecked(m_ndepth&16);
   ui->actionInclude_correlation->setChecked(m_ndepth&32);
   ui->actionEnable_AP_DXcall->setChecked(m_ndepth&64);
+  ui->actionAlso_FST240W->setChecked(m_ndepth&128);
 
   m_UTCdisk=-1;
   m_fCPUmskrtd=0.0;
@@ -2927,6 +2928,7 @@ void MainWindow::decode()                                       //decode()
   if (!ui->actionInclude_averaging->isVisible ()) depth &= ~16;
   if (!ui->actionInclude_correlation->isVisible ()) depth &= ~32;
   if (!ui->actionEnable_AP_DXcall->isVisible ()) depth &= ~64;
+  if (!ui->actionAlso_FST240W->isVisible ()) depth &= ~128;
   dec_data.params.ndepth=depth;
   dec_data.params.n2pass=1;
   if(m_config.twoPass()) dec_data.params.n2pass=2;
@@ -5833,6 +5835,7 @@ void MainWindow::on_actionFST240_triggered()
   m_wideGraph->setMode(m_mode);
   m_wideGraph->setModeTx(m_modeTx);
   switch_mode (Modes::FST240);
+  m_wideGraph->setMode(m_mode);
   statusChanged();
 }
 
@@ -6443,6 +6446,7 @@ void MainWindow::switch_mode (Mode mode)
     ui->label_6->setVisible(false);
     ui->label_7->setVisible(false);
   }
+  ui->actionAlso_FST240W->setVisible(m_mode.startsWith("FST240"));
 }
 
 void MainWindow::WSPR_config(bool b)
@@ -6527,6 +6531,8 @@ void MainWindow::on_actionInclude_averaging_toggled (bool checked)
   m_ndepth ^= (-checked ^ m_ndepth) & 0x00000010;
 }
 
+
+
 void MainWindow::on_actionInclude_correlation_toggled (bool checked)
 {
   m_ndepth ^= (-checked ^ m_ndepth) & 0x00000020;
@@ -6537,6 +6543,11 @@ void MainWindow::on_actionEnable_AP_DXcall_toggled (bool checked)
   m_ndepth ^= (-checked ^ m_ndepth) & 0x00000040;
 }
 
+void MainWindow::on_actionAlso_FST240W_toggled (bool checked)
+{
+  m_ndepth ^= (-checked ^ m_ndepth) & 0x00000080;
+}
+
 void MainWindow::on_actionErase_ALL_TXT_triggered()          //Erase ALL.TXT
 {
   int ret = MessageBox::query_message (this, tr ("Confirm Erase"),

widgets/mainwindow.h

@@ -265,6 +265,7 @@ private slots:
   void on_fox_log_action_triggered ();
   void on_actionColors_triggered();
   void on_actionInclude_averaging_toggled (bool);
+  void on_actionAlso_FST240W_toggled (bool);
   void on_actionInclude_correlation_toggled (bool);
   void on_actionEnable_AP_DXcall_toggled (bool);
   void VHF_features_enabled(bool b);

widgets/mainwindow.ui

@@ -2829,6 +2829,7 @@ list. The list can be maintained in Settings (F2).</string>
     <addaction name="actionEnable_AP_FT8"/>
     <addaction name="actionEnable_AP_JT65"/>
     <addaction name="actionEnable_AP_DXcall"/>
+    <addaction name="actionAlso_FST240W"/>
    </widget>
    <widget class="QMenu" name="menuSave">
     <property name="title">
@@ -3523,6 +3524,17 @@ list. The list can be maintained in Settings (F2).</string>
     <string>FST240W</string>
    </property>
   </action>
+  <action name="actionAlso_FST240W">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="enabled">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Also FST240W</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>

widgets/widegraph.cpp

@@ -294,7 +294,7 @@ void WideGraph::setTxFreq(int n)                                   //setTxFreq
 void WideGraph::setMode(QString mode)                              //setMode
 {
   m_mode=mode;
-  ui->fSplitSpinBox->setEnabled(m_mode=="JT9+JT65");
+  ui->fSplitSpinBox->setEnabled(m_mode=="JT9+JT65" or m_mode.startsWith("FST240"));
   ui->widePlot->setMode(mode);
   ui->widePlot->DrawOverlay();
   ui->widePlot->update();
@@ -368,7 +368,7 @@ void WideGraph::setRxBand (QString const& band)
   else
     {
       ui->fSplitSpinBox->setValue (m_fMinPerBand.value (band, 2500).toUInt ());
-      ui->fSplitSpinBox->setEnabled (m_mode=="JT9+JT65");
+      ui->fSplitSpinBox->setEnabled (m_mode=="JT9+JT65" or m_mode.startsWith("FST240"));
     }
   ui->widePlot->setRxBand(band);
   setRxRange ();

widgets/widegraph.ui

@@ -362,10 +362,10 @@
          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Decode JT9 only above this frequency&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
         </property>
         <property name="suffix">
-         <string>  JT9</string>
+         <string>  Hz</string>
         </property>
         <property name="prefix">
-         <string>JT65  </string>
+         <string>Split  </string>
         </property>
         <property name="minimum">
          <number>0</number>