diff --git a/samples/blackgui/mainwindow.h b/samples/blackgui/mainwindow.h
index 3dc587521..7adb28acf 100644
--- a/samples/blackgui/mainwindow.h
+++ b/samples/blackgui/mainwindow.h
@@ -176,6 +176,13 @@ private:
      */
     bool isCockpitUpdatePending() const;
 
+    /*!
+     * \brief Round the com frequency display
+     * \param com1
+     * \param com2
+     */
+    void roundComFrequencyDisplays(const BlackMisc::Aviation::CComSystem &com1, const BlackMisc::Aviation::CComSystem &com2);
+
     /*!
      * \brief Add new text message tab
      * \param tabName
diff --git a/samples/blackgui/mainwindow.ui b/samples/blackgui/mainwindow.ui
index 053aa5f81..4d35fbe31 100644
--- a/samples/blackgui/mainwindow.ui
+++ b/samples/blackgui/mainwindow.ui
@@ -388,7 +388,7 @@ QSizeGrip {
           <enum>QFrame::NoFrame</enum>
          </property>
          <property name="currentIndex">
-          <number>6</number>
+          <number>3</number>
          </property>
          <widget class="QWidget" name="pg_StatusPage">
           <property name="sizePolicy">
@@ -894,7 +894,7 @@ QSizeGrip {
                 <double>136.000000000000000</double>
                </property>
                <property name="singleStep">
-                <double>0.250000000000000</double>
+                <double>0.025000000000000</double>
                </property>
                <property name="value">
                 <double>118.000000000000000</double>
@@ -946,7 +946,7 @@ QSizeGrip {
                 <double>136.000000000000000</double>
                </property>
                <property name="singleStep">
-                <double>0.250000000000000</double>
+                <double>0.025000000000000</double>
                </property>
                <property name="value">
                 <double>119.000000000000000</double>
@@ -980,7 +980,7 @@ QSizeGrip {
                 <double>136.000000000000000</double>
                </property>
                <property name="singleStep">
-                <double>0.250000000000000</double>
+                <double>0.025000000000000</double>
                </property>
                <property name="value">
                 <double>118.250000000000000</double>
@@ -1011,7 +1011,7 @@ QSizeGrip {
                 <double>136.000000000000000</double>
                </property>
                <property name="singleStep">
-                <double>0.250000000000000</double>
+                <double>0.025000000000000</double>
                </property>
                <property name="value">
                 <double>119.250000000000000</double>
diff --git a/samples/blackgui/mainwindow_cockpit.cpp b/samples/blackgui/mainwindow_cockpit.cpp
index c82812a22..12d749339 100644
--- a/samples/blackgui/mainwindow_cockpit.cpp
+++ b/samples/blackgui/mainwindow_cockpit.cpp
@@ -54,6 +54,7 @@ void MainWindow::cockpitValuesChanged()
     }
 
     // this will call send cockpit updates with all changes made
+    // send cockpit updates
     this->m_timerCollectedCockpitUpdates->stop();
     this->m_timerCollectedCockpitUpdates->start(1000); // start
     this->m_timerCollectedCockpitUpdates->setSingleShot(true);
@@ -78,22 +79,7 @@ void MainWindow::updateCockpitFromContext()
     const CComSystem com2 = this->m_ownAircraft.getCom2System();
     const CTransponder transponder = this->m_ownAircraft.getTransponder();
 
-    double freq = com1.getFrequencyActive().valueRounded(3);
-    if (freq != this->ui->ds_CockpitCom1Active->value())
-        this->ui->ds_CockpitCom1Active->setValue(freq);
-
-    freq = com2.getFrequencyActive().valueRounded(3);
-    if (freq != this->ui->ds_CockpitCom2Active->value())
-        this->ui->ds_CockpitCom2Active->setValue(freq);
-
-    freq = com1.getFrequencyStandby().valueRounded(3);
-    if (freq != this->ui->ds_CockpitCom1Standby->value())
-        this->ui->ds_CockpitCom1Standby->setValue(freq);
-
-    freq = com2.getFrequencyStandby().valueRounded(3);
-    if (freq != this->ui->ds_CockpitCom2Standby->value())
-        this->ui->ds_CockpitCom2Standby->setValue(freq);
-
+    this->roundComFrequencyDisplays(com1, com2);
     qint32 tc = transponder.getTransponderCode();
     if (tc != static_cast<qint32>(this->ui->ds_CockpitTransponder->value()))
         this->ui->ds_CockpitTransponder->setValue(tc);
@@ -146,6 +132,30 @@ void MainWindow::updateCockpitFromContext()
     }
 }
 
+/*
+ * Round the com frequency displays
+ */
+void MainWindow::roundComFrequencyDisplays(const CComSystem &com1, const CComSystem &com2)
+{
+    // do not just set! Leads to unwanted signals fired
+    double freq = com1.getFrequencyActive().valueRounded(3);
+    if (freq != this->ui->ds_CockpitCom1Active->value())
+        this->ui->ds_CockpitCom1Active->setValue(freq);
+
+    freq = com2.getFrequencyActive().valueRounded(3);
+    if (freq != this->ui->ds_CockpitCom2Active->value())
+        this->ui->ds_CockpitCom2Active->setValue(freq);
+
+    freq = com1.getFrequencyStandby().valueRounded(3);
+    if (freq != this->ui->ds_CockpitCom1Standby->value())
+
+        this->ui->ds_CockpitCom1Standby->setValue(freq);
+
+    freq = com2.getFrequencyStandby().valueRounded(3);
+    if (freq != this->ui->ds_CockpitCom2Standby->value())
+        this->ui->ds_CockpitCom2Standby->setValue(freq);
+}
+
 /*
  * Reset transponder mode to Standby / Charly
  */
@@ -210,6 +220,7 @@ void MainWindow::sendCockpitUpdates()
     com1.setFrequencyStandbyMHz(this->ui->ds_CockpitCom1Standby->value());
     com2.setFrequencyActiveMHz(this->ui->ds_CockpitCom2Active->value());
     com2.setFrequencyStandbyMHz(this->ui->ds_CockpitCom2Standby->value());
+    this->roundComFrequencyDisplays(com1, com2);
 
     //
     // Send to context