diff --git a/Configuration.cpp b/Configuration.cpp
index f13f293..6e015cf 100644
--- a/Configuration.cpp
+++ b/Configuration.cpp
@@ -642,7 +642,7 @@ private:
   bool insert_blank_;
   bool DXCC_;
   bool ppfx_;
-  bool clear_DX_;
+  bool clear_callsign_;
   bool miles_;
   bool quick_call_;
   bool disable_TX_on_73_;
@@ -773,7 +773,7 @@ bool Configuration::prompt_to_log () const {return m_->prompt_to_log_;}
 bool Configuration::insert_blank () const {return m_->insert_blank_;}
 bool Configuration::DXCC () const {return m_->DXCC_;}
 bool Configuration::ppfx() const {return m_->ppfx_;}
-bool Configuration::clear_DX () const {return m_->clear_DX_;}
+bool Configuration::clear_callsign () const {return m_->clear_callsign_;}
 bool Configuration::miles () const {return m_->miles_;}
 bool Configuration::quick_call () const {return m_->quick_call_;}
 bool Configuration::disable_TX_on_73 () const {return m_->disable_TX_on_73_;}
@@ -1367,7 +1367,7 @@ void Configuration::impl::initialize_models ()
   ui_->stations_table_view->setEnabled(ui_->auto_switch_bands_check_box->isChecked());
   ui_->report_in_comments_check_box->setChecked (report_in_comments_);
   ui_->prompt_to_log_check_box->setChecked (prompt_to_log_);
-  ui_->clear_DX_check_box->setChecked (clear_DX_);
+  ui_->clear_callsign_check_box->setChecked (clear_callsign_);
   ui_->miles_check_box->setChecked (miles_);
   ui_->quick_call_check_box->setChecked (quick_call_);
   ui_->disable_TX_on_73_check_box->setChecked (disable_TX_on_73_);
@@ -1677,7 +1677,7 @@ void Configuration::impl::read_settings ()
   insert_blank_ = settings_->value ("InsertBlank", false).toBool ();
   DXCC_ = settings_->value ("DXCCEntity", false).toBool ();
   ppfx_ = settings_->value ("PrincipalPrefix", false).toBool ();
-  clear_DX_ = settings_->value ("ClearCallGrid", false).toBool ();
+  clear_callsign_ = settings_->value ("ClearCallGrid", false).toBool ();
   miles_ = settings_->value ("Miles", false).toBool ();
   quick_call_ = settings_->value ("QuickCall", false).toBool ();
   disable_TX_on_73_ = settings_->value ("73TxDisable", false).toBool ();
@@ -1812,7 +1812,7 @@ void Configuration::impl::write_settings ()
   settings_->setValue ("InsertBlank", insert_blank_);
   settings_->setValue ("DXCCEntity", DXCC_);
   settings_->setValue ("PrincipalPrefix", ppfx_);
-  settings_->setValue ("ClearCallGrid", clear_DX_);
+  settings_->setValue ("ClearCallGrid", clear_callsign_);
   settings_->setValue ("Miles", miles_);
   settings_->setValue ("QuickCall", quick_call_);
   settings_->setValue ("73TxDisable", disable_TX_on_73_);
@@ -2297,7 +2297,7 @@ void Configuration::impl::accept ()
   log_as_DATA_ = ui_->log_as_RTTY_check_box->isChecked ();
   report_in_comments_ = ui_->report_in_comments_check_box->isChecked ();
   prompt_to_log_ = ui_->prompt_to_log_check_box->isChecked ();
-  clear_DX_ = ui_->clear_DX_check_box->isChecked ();
+  clear_callsign_ = ui_->clear_callsign_check_box->isChecked ();
   miles_ = ui_->miles_check_box->isChecked ();
   quick_call_ = ui_->quick_call_check_box->isChecked ();
   disable_TX_on_73_ = ui_->disable_TX_on_73_check_box->isChecked ();
diff --git a/Configuration.hpp b/Configuration.hpp
index a8279d3..ce0b1cf 100644
--- a/Configuration.hpp
+++ b/Configuration.hpp
@@ -133,7 +133,7 @@ public:
   bool insert_blank () const;
   bool DXCC () const;
   bool ppfx() const;
-  bool clear_DX () const;
+  bool clear_callsign () const;
   bool miles () const;
   bool quick_call () const;
   bool disable_TX_on_73 () const;
diff --git a/Configuration.ui b/Configuration.ui
index 38d9c05..c68e5cc 100644
--- a/Configuration.ui
+++ b/Configuration.ui
@@ -278,9 +278,9 @@
               <property name="geometry">
                <rect>
                 <x>0</x>
-                <y>0</y>
+                <y>-26</y>
                 <width>724</width>
-                <height>473</height>
+                <height>479</height>
                </rect>
               </property>
               <layout class="QVBoxLayout" name="verticalLayout_26">
@@ -725,6 +725,19 @@ text message.</string>
                     </item>
                    </layout>
                   </item>
+                  <item>
+                   <spacer name="verticalSpacer_2">
+                    <property name="orientation">
+                     <enum>Qt::Vertical</enum>
+                    </property>
+                    <property name="sizeHint" stdset="0">
+                     <size>
+                      <width>20</width>
+                      <height>20</height>
+                     </size>
+                    </property>
+                   </spacer>
+                  </item>
                  </layout>
                 </widget>
                </item>
@@ -1975,7 +1988,7 @@ both here.</string>
             <x>0</x>
             <y>0</y>
             <width>746</width>
-            <height>519</height>
+            <height>548</height>
            </rect>
           </property>
           <layout class="QVBoxLayout" name="verticalLayout_30">
@@ -2023,19 +2036,18 @@ both here.</string>
                  </widget>
                 </item>
                 <item row="2" column="1">
-                 <widget class="QCheckBox" name="clear_DX_check_box">
+                 <widget class="QCheckBox" name="clear_callsign_check_box">
                   <property name="enabled">
-                   <bool>false</bool>
+                   <bool>true</bool>
                   </property>
                   <property name="visible">
                    <bool>false</bool>
                   </property>
                   <property name="toolTip">
-                   <string>Check this option to force the clearing of the DX Call
-and DX Grid fields when a 73 or free text message is sent.</string>
+                   <string>Check this option to force deselect callsign after logging.</string>
                   </property>
                   <property name="text">
-                   <string>Clear &amp;DX call and grid after logging</string>
+                   <string>Deselect callsign after logging</string>
                   </property>
                  </widget>
                 </item>
@@ -3999,12 +4011,12 @@ soundcard changes</string>
   </connection>
  </connections>
  <buttongroups>
+  <buttongroup name="TX_audio_source_button_group"/>
   <buttongroup name="CAT_handshake_button_group"/>
-  <buttongroup name="PTT_method_button_group"/>
   <buttongroup name="CAT_data_bits_button_group"/>
+  <buttongroup name="PTT_method_button_group"/>
   <buttongroup name="CAT_stop_bits_button_group"/>
   <buttongroup name="split_mode_button_group"/>
-  <buttongroup name="TX_audio_source_button_group"/>
   <buttongroup name="TX_mode_button_group"/>
  </buttongroups>
 </ui>
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 915e08c..8d4014a 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -5952,11 +5952,14 @@ void MainWindow::acceptQSO (QDateTime const& QSO_date_off, QString const& call,
       {"STATION.GRID", QVariant(my_grid)}
   });
 
-  clearCallsignSelected();
-
   m_logBook.init();
 
-  if (m_config.clear_DX () and !m_config.bHound()) clearDX ();
+  if (m_config.clear_callsign ()){
+      clearDX ();
+      clearCallsignSelected();
+  }
+
+  displayCallActivity();
 
   m_dateTimeQSOOn = QDateTime {};
 }
@@ -8521,6 +8524,9 @@ void MainWindow::processActivity(bool force) {
 }
 
 void MainWindow::observeTimeDeltaForAverage(float delta){
+    // delta can only be +/- 15 seconds
+    delta = qMax(-15.0F, qMin(delta, 15.0F));
+
     // compute average drift
     if(m_timeDeltaMsMMA_N == 0){
         m_timeDeltaMsMMA_N++;