diff --git a/ground/src/experimental/DialTest/README.txt b/ground/src/experimental/DialTest/README.txt
index b52cc86b0..62f04276e 100644
--- a/ground/src/experimental/DialTest/README.txt
+++ b/ground/src/experimental/DialTest/README.txt
@@ -1,4 +1,4 @@
 Widget experiments. Compile and run test application
 to see widget. 
 
-Simple panel lets you test new backgrounds.
\ No newline at end of file
+Simple panel lets you test new backgrounds.
diff --git a/ground/src/experimental/DialTest/basicdial.cpp b/ground/src/experimental/DialTest/basicdial.cpp
index f8d31dc24..e444d2702 100644
--- a/ground/src/experimental/DialTest/basicdial.cpp
+++ b/ground/src/experimental/DialTest/basicdial.cpp
@@ -27,18 +27,22 @@ void BasicDial::paintEvent(QPaintEvent *event) {
 
 void BasicDial::renderBackground(void) {
     int side = qMin(width(), height());
-    if( bg.size() == QSize(side, side) ) {
+    if( bg.size() == size() ) {
         qDebug() << "BasicDial::renderBackground(): Size not changed! Abort rerendering stuff";
         return;
     }
-    QPixmap pixmap(QSize(side, side));
+    /* Create buffer pixmap and make it transparent */
+    QPixmap pixmap(size());
     pixmap.fill(Qt::transparent);
+
+    /* Configure painter */
     QPainter painter(&pixmap);
     painter.setRenderHint(QPainter::Antialiasing);
-    QRectF frame( QPoint(0, 0), QPoint(side-1, side-1));
-    renderer->load(backgroundFile);
-    renderer->render(&painter, frame);
-    bg = pixmap;
+
+    renderer->load(backgroundFile);          /* load file; needed to calculate frame         */
+    QRectF frame = calculateCenteredFrame(); /* viewport from renderer (based on loaded file */
+    renderer->render(&painter, frame);       /* dump bg on pixmap                            */
+    bg = pixmap;                             /* save it                                      */
 }
 
 void BasicDial::renderNeedle(qreal angle) {
@@ -93,3 +97,17 @@ void BasicDial::setPen(QPen p) {
     pen = p;
     pen.setWidth(2);
 }
+
+QRectF BasicDial::calculateCenteredFrame(void) {
+    QRectF vb = renderer->viewBoxF();                                   /* get SVG viewport                      */
+    qreal scale = qMax( (vb.height()/height()), (vb.width()/width()));  /* calc scale to fit SVG into widget     */
+    vb.setWidth( vb.width()/scale );                                    /* scale viewport so SVG fit widget size */
+    vb.setHeight( vb.height()/scale );
+
+    QRectF frame;                             /* let's prepare render frame for bg */
+    frame.setX( (width()-vb.width())/2.0 );   /* frame is centered on widget       */
+    frame.setY( (height()-vb.height())/2.0 );
+    frame.setWidth(  vb.width() );            /* derive size from scaled viewport  */
+    frame.setHeight( vb.height() );
+    return frame;
+}
diff --git a/ground/src/experimental/DialTest/basicdial.h b/ground/src/experimental/DialTest/basicdial.h
index 43643b73e..80624878e 100644
--- a/ground/src/experimental/DialTest/basicdial.h
+++ b/ground/src/experimental/DialTest/basicdial.h
@@ -29,6 +29,8 @@ private:
     void  renderNeedle(qreal angle);
     qreal value2angle(qreal value);
 
+    QRectF calculateCenteredFrame(void);
+
     QSvgRenderer *renderer;
     QPixmap       bg;
     qreal         angle;