diff --git a/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.cpp b/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.cpp
index da8ace55..cab81dbe 100644
--- a/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.cpp
+++ b/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.cpp
@@ -88,6 +88,22 @@ void TraceSetSelector::setPorts(unsigned int newPorts)
     emit selectionChanged();
 }
 
+void TraceSetSelector::setDefaultTraces()
+{
+    auto traces = model->getTraces();
+    for(unsigned int i=1;i<=ports;i++) {
+        for(unsigned int j=1;j<=ports;j++) {
+            QString defaultTraceName = "S"+QString::number(i)+QString::number(j);
+            for(auto t : traces) {
+                if(t->name() == defaultTraceName) {
+                    setTrace(i, j, t);
+                    break;
+                }
+            }
+        }
+    }
+}
+
 bool TraceSetSelector::setTrace(unsigned int destPort, unsigned int srcPort, Trace *t)
 {
     if(destPort < 1 || destPort > ports || srcPort < 1 || srcPort > ports) {
diff --git a/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.h b/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.h
index 6b4857d6..33a4b3a6 100644
--- a/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.h
+++ b/Software/PC_Application/LibreVNA-GUI/CustomWidgets/tracesetselector.h
@@ -20,6 +20,7 @@ class TraceSetSelector : public QWidget
 
     unsigned int getPorts() const;
     void setPorts(unsigned int newPorts);
+    void setDefaultTraces();
 
     bool setTrace(unsigned int destPort, unsigned int srcPort, Trace *t);
     Trace *getTrace(unsigned int destPort, unsigned int srcPort);
diff --git a/Software/PC_Application/LibreVNA-GUI/Tools/mixedmodeconversion.cpp b/Software/PC_Application/LibreVNA-GUI/Tools/mixedmodeconversion.cpp
index a07f26eb..1c1d211b 100644
--- a/Software/PC_Application/LibreVNA-GUI/Tools/mixedmodeconversion.cpp
+++ b/Software/PC_Application/LibreVNA-GUI/Tools/mixedmodeconversion.cpp
@@ -19,6 +19,7 @@ MixedModeConversion::MixedModeConversion(TraceModel &m, QWidget *parent) :
     });
     connect(ui->buttonBox->button(QDialogButtonBox::Cancel), &QPushButton::clicked, this, &QDialog::reject);
     selectionChanged();
+    ui->selector->setDefaultTraces();
 }
 
 MixedModeConversion::~MixedModeConversion()