diff --git a/sdrbase/mainwindow.cpp b/sdrbase/mainwindow.cpp
index 38afbfa10..c40dab525 100644
--- a/sdrbase/mainwindow.cpp
+++ b/sdrbase/mainwindow.cpp
@@ -397,12 +397,14 @@ QTreeWidgetItem* MainWindow::addPresetToTree(const Preset* preset)
 	}
 
 	QStringList sl;
-	sl.append(QString("%1 kHz").arg(preset->getCenterFrequency() / 1000));
-	sl.append(preset->getDescription());
+	sl.append(QString("%1").arg(preset->getCenterFrequency() / 1e6f, 0, 'f', 3)); // frequency column
+	sl.append(QString("%1").arg(preset->isSourcePreset() ? 'R' : 'T'));           // mode column
+	sl.append(preset->getDescription());                                          // description column
 	PresetItem* item = new PresetItem(group, sl, preset->getCenterFrequency(), PItem);
 	item->setTextAlignment(0, Qt::AlignRight);
 	item->setData(0, Qt::UserRole, qVariantFromValue(preset));
-	ui->presetTree->resizeColumnToContents(0);
+	ui->presetTree->resizeColumnToContents(0); // Resize frequency column to minimum
+    ui->presetTree->resizeColumnToContents(1); // Resize mode column to minimum
 
 	updatePresetControls();
 	return item;
diff --git a/sdrbase/mainwindow.ui b/sdrbase/mainwindow.ui
index 5dc56225c..03dc2dc22 100644
--- a/sdrbase/mainwindow.ui
+++ b/sdrbase/mainwindow.ui
@@ -244,12 +244,29 @@
      </item>
      <item row="1" column="1" rowspan="4" colspan="12">
       <widget class="QTreeWidget" name="presetTree">
+       <property name="indentation">
+        <number>10</number>
+       </property>
        <property name="allColumnsShowFocus">
         <bool>true</bool>
        </property>
+       <attribute name="headerMinimumSectionSize">
+        <number>5</number>
+       </attribute>
        <column>
         <property name="text">
-         <string>Frequency</string>
+         <string>Freq (MHz)</string>
+        </property>
+        <property name="toolTip">
+         <string>Center frequency in MHz</string>
+        </property>
+       </column>
+       <column>
+        <property name="text">
+         <string>M</string>
+        </property>
+        <property name="toolTip">
+         <string>Mode: R: Rx or source, T: Tx or sink</string>
         </property>
        </column>
        <column>
diff --git a/sdrbase/settings/preset.cpp b/sdrbase/settings/preset.cpp
index 08526745d..105d77f9a 100644
--- a/sdrbase/settings/preset.cpp
+++ b/sdrbase/settings/preset.cpp
@@ -24,8 +24,9 @@ void Preset::resetToDefaults()
 
 QByteArray Preset::serialize() const
 {
-	qDebug("Preset::serialize: m_group: %s m_description: %s m_centerFrequency: %llu",
+	qDebug("Preset::serialize: m_group: %s mode: %s m_description: %s m_centerFrequency: %llu",
 			qPrintable(m_group),
+			m_sourcePreset ? "Rx" : "Tx",
 			qPrintable(m_description),
 			m_centerFrequency);
 
@@ -36,6 +37,7 @@ QByteArray Preset::serialize() const
 	s.writeU64(3, m_centerFrequency);
 	s.writeBlob(4, m_layout);
 	s.writeBlob(5, m_spectrumConfig);
+	s.writeBool(6, m_sourcePreset);
 
 	s.writeS32(20, m_deviceConfigs.size());
 
@@ -87,9 +89,11 @@ bool Preset::deserialize(const QByteArray& data)
 		d.readU64(3, &m_centerFrequency, 0);
 		d.readBlob(4, &m_layout);
 		d.readBlob(5, &m_spectrumConfig);
+		d.readBool(6, &m_sourcePreset, true);
 
-		qDebug("Preset::deserialize: m_group: %s m_description: %s m_centerFrequency: %llu",
+		qDebug("Preset::deserialize: m_group: %s mode: %s m_description: %s m_centerFrequency: %llu",
 				qPrintable(m_group),
+				m_sourcePreset ? "Rx" : "Tx",
 				qPrintable(m_description),
 				m_centerFrequency);