diff --git a/tools/cooja/apps/mrm/java/org/contikios/mrm/AreaViewer.java b/tools/cooja/apps/mrm/java/org/contikios/mrm/AreaViewer.java
index 67d268bc2..1d98efb06 100644
--- a/tools/cooja/apps/mrm/java/org/contikios/mrm/AreaViewer.java
+++ b/tools/cooja/apps/mrm/java/org/contikios/mrm/AreaViewer.java
@@ -229,8 +229,8 @@ public class AreaViewer extends VisPlugin {
 
     // We want to listen to changes both in the channel model as well as in the radio medium
     currentChannelModel.addSettingsObserver(channelModelSettingsObserver);
-    currentRadioMedium.addSettingsObserver(radioMediumSettingsObserver);
-    currentRadioMedium.addRadioMediumObserver(radioMediumActivityObserver);
+    currentRadioMedium.addRadioMediumObserver(radioMediumSettingsObserver);
+    currentRadioMedium.addRadioTransmissionObserver(radioMediumActivityObserver);
 
     // Set initial size etc.
     setSize(500, 500);
@@ -2338,13 +2338,13 @@ public class AreaViewer extends VisPlugin {
     }
 
     if (currentRadioMedium != null && radioMediumSettingsObserver != null) {
-      currentRadioMedium.deleteSettingsObserver(radioMediumSettingsObserver);
+      currentRadioMedium.deleteRadioMediumObserver(radioMediumSettingsObserver);
     } else {
       logger.fatal("Could not remove observer: " + radioMediumSettingsObserver);
     }
 
     if (currentRadioMedium != null && radioMediumActivityObserver != null) {
-      currentRadioMedium.deleteRadioMediumObserver(radioMediumActivityObserver);
+      currentRadioMedium.deleteRadioTransmissionObserver(radioMediumActivityObserver);
     } else {
       logger.fatal("Could not remove observer: " + radioMediumActivityObserver);
     }
diff --git a/tools/cooja/apps/mrm/java/org/contikios/mrm/ChannelModel.java b/tools/cooja/apps/mrm/java/org/contikios/mrm/ChannelModel.java
index 579244f75..9d0427c8a 100644
--- a/tools/cooja/apps/mrm/java/org/contikios/mrm/ChannelModel.java
+++ b/tools/cooja/apps/mrm/java/org/contikios/mrm/ChannelModel.java
@@ -53,6 +53,8 @@ import org.contikios.cooja.Simulation;
 import org.contikios.cooja.interfaces.DirectionalAntennaRadio;
 import org.contikios.cooja.interfaces.Radio;
 import org.contikios.cooja.radiomediums.AbstractRadioMedium;
+import org.contikios.cooja.util.ScnObservable;
+
 import statistics.GaussianWrapper;
 
 /**
@@ -103,13 +105,7 @@ public class ChannelModel {
   /**
    * Notifies observers when this channel model has changed settings.
    */
-  private class SettingsObservable extends Observable {
-    private void notifySettingsChanged() {
-      setChanged();
-      notifyObservers();
-    }
-  }
-  private SettingsObservable settingsObservable = new SettingsObservable();
+  private ScnObservable settingsObservable = new ScnObservable();
   public enum Parameter {
     apply_random,
     snr_threshold,
@@ -330,7 +326,7 @@ public class ChannelModel {
    */
   public void removeAllObstacles() {
     myObstacleWorld.removeAll();
-    settingsObservable.notifySettingsChanged();
+    settingsObservable.setChangedAndNotify();
   }
 
   /**
@@ -360,7 +356,7 @@ public class ChannelModel {
     myObstacleWorld.addObstacle(startX, startY, width, height);
 
     if (notify) {
-      settingsObservable.notifySettingsChanged();
+      settingsObservable.setChangedAndNotify();
     }
   }
 
@@ -442,7 +438,7 @@ public class ChannelModel {
     needToPrecalculateFSPL = true;
     needToPrecalculateOutputPower = true;
 
-    settingsObservable.notifySettingsChanged();
+    settingsObservable.setChangedAndNotify();
   }
 
   /**
@@ -450,9 +446,9 @@ public class ChannelModel {
    * will be notified.
    */
   public void notifySettingsChanged() {
-    settingsObservable.notifySettingsChanged();
+    settingsObservable.setChangedAndNotify();
   }
-
+  
   /**
    * Path loss component from Friis' transmission equation.
    * Uses frequency and distance only.
@@ -1884,7 +1880,7 @@ public class ChannelModel {
     }
     needToPrecalculateFSPL = true;
     needToPrecalculateOutputPower = true;
-    settingsObservable.notifySettingsChanged();
+    settingsObservable.setChangedAndNotify();
     return true;
   }
 
diff --git a/tools/cooja/apps/mrm/java/org/contikios/mrm/MRM.java b/tools/cooja/apps/mrm/java/org/contikios/mrm/MRM.java
index a19dcee58..e8af73370 100644
--- a/tools/cooja/apps/mrm/java/org/contikios/mrm/MRM.java
+++ b/tools/cooja/apps/mrm/java/org/contikios/mrm/MRM.java
@@ -49,6 +49,7 @@ import org.contikios.cooja.interfaces.Position;
 import org.contikios.cooja.interfaces.Radio;
 import org.contikios.cooja.plugins.Visualizer;
 import org.contikios.cooja.radiomediums.AbstractRadioMedium;
+import org.contikios.cooja.util.ScnObservable;
 import org.contikios.mrm.ChannelModel.Parameter;
 import org.contikios.mrm.ChannelModel.RadioPair;
 import org.contikios.mrm.ChannelModel.TxPair;
@@ -90,11 +91,6 @@ public class MRM extends AbstractRadioMedium {
   private Random random = null;
   private ChannelModel currentChannelModel = null;
 
-  /**
-   * Notifies observers when this radio medium has changed settings.
-   */
-  private SettingsObservable settingsObservable = new SettingsObservable();
-
   /**
    * Creates a new Multi-path Ray-tracing Medium (MRM).
    */
@@ -114,6 +110,9 @@ public class MRM extends AbstractRadioMedium {
         WITH_CAPTURE_EFFECT = currentChannelModel.getParameterBooleanValue(ChannelModel.Parameter.captureEffect);
         CAPTURE_EFFECT_THRESHOLD = currentChannelModel.getParameterDoubleValue(ChannelModel.Parameter.captureEffectSignalTreshold);
         CAPTURE_EFFECT_PREAMBLE_DURATION = currentChannelModel.getParameterDoubleValue(ChannelModel.Parameter.captureEffectPreambleDuration);
+        
+        /* Radio Medium changed here, so notify */
+        radioMediumObservable.setChangedAndNotify();
       }
     });
     
@@ -142,6 +141,9 @@ public class MRM extends AbstractRadioMedium {
   public void registerRadioInterface(Radio radio, Simulation sim) {
         super.registerRadioInterface(radio, sim);
         
+        /* Radio Medium changed here so notify Observers */
+        radioMediumObservable.setChangedAndNotify();
+        
         if (WITH_NOISE && radio instanceof NoiseSourceRadio) {
                 ((NoiseSourceRadio)radio).addNoiseLevelListener(noiseListener);
         }
@@ -149,6 +151,9 @@ public class MRM extends AbstractRadioMedium {
   public void unregisterRadioInterface(Radio radio, Simulation sim) {
         super.unregisterRadioInterface(radio, sim);
 
+        /* Radio Medium changed here so notify Observers */
+        radioMediumObservable.setChangedAndNotify();
+        
         if (WITH_NOISE && radio instanceof NoiseSourceRadio) {
                 ((NoiseSourceRadio)radio).removeNoiseLevelListener(noiseListener);
         }
@@ -402,25 +407,6 @@ public class MRM extends AbstractRadioMedium {
 
   // -- MRM specific methods --
 
-  /**
-   * Adds an observer which is notified when this radio medium has
-   * changed settings, such as added or removed radios.
-   *
-   * @param obs New observer
-   */
-  public void addSettingsObserver(Observer obs) {
-    settingsObservable.addObserver(obs);
-  }
-
-  /**
-   * Deletes an earlier registered setting observer.
-   *
-   * @param obs Earlier registered observer
-   */
-  public void deleteSettingsObserver(Observer obs) {
-    settingsObservable.deleteObserver(obs);
-  }
-
   /**
    * @return Number of registered radios.
    */
@@ -449,13 +435,6 @@ public class MRM extends AbstractRadioMedium {
     return currentChannelModel;
   }
 
-  class SettingsObservable extends Observable {
-    private void notifySettingsChanged() {
-      setChanged();
-      notifyObservers();
-    }
-  }
-
   class MRMRadioConnection extends RadioConnection {
     private Hashtable<Radio, Double> signalStrengths = new Hashtable<Radio, Double>();
 
diff --git a/tools/cooja/java/org/contikios/cooja/Cooja.java b/tools/cooja/java/org/contikios/cooja/Cooja.java
index c131e3e22..0040e7a31 100644
--- a/tools/cooja/java/org/contikios/cooja/Cooja.java
+++ b/tools/cooja/java/org/contikios/cooja/Cooja.java
@@ -139,6 +139,7 @@ import org.contikios.cooja.plugins.ScriptRunner;
 import org.contikios.cooja.plugins.SimControl;
 import org.contikios.cooja.plugins.SimInformation;
 import org.contikios.cooja.util.ExecuteJAR;
+import org.contikios.cooja.util.ScnObservable;
 
 /**
  * Main file of COOJA Simulator. Typically contains a visualizer for the
@@ -325,21 +326,10 @@ public class Cooja extends Observable {
 
   private Vector<Class<? extends Positioner>> positionerClasses = new Vector<Class<? extends Positioner>>();
 
-  private class HighlightObservable extends Observable {
-    private void setChangedAndNotify(Mote mote) {
-      setChanged();
-      notifyObservers(mote);
-    }
-  }
-  private HighlightObservable moteHighlightObservable = new HighlightObservable();
 
-  private class MoteRelationsObservable extends Observable {
-    private void setChangedAndNotify() {
-      setChanged();
-      notifyObservers();
-    }
-  }
-  private MoteRelationsObservable moteRelationObservable = new MoteRelationsObservable();
+  private ScnObservable moteHighlightObservable = new ScnObservable();
+
+  private ScnObservable moteRelationObservable = new ScnObservable();
 
   private JTextPane quickHelpTextPane;
   private JScrollPane quickHelpScroll;
diff --git a/tools/cooja/java/org/contikios/cooja/RadioMedium.java b/tools/cooja/java/org/contikios/cooja/RadioMedium.java
index da60dc492..4905a187f 100644
--- a/tools/cooja/java/org/contikios/cooja/RadioMedium.java
+++ b/tools/cooja/java/org/contikios/cooja/RadioMedium.java
@@ -100,24 +100,24 @@ public abstract class RadioMedium {
    * Adds an observer which is notified each time a radio connection has finished.
    *
    * @see #getLastConnection()
-   * @see #deleteRadioMediumObserver(Observer)
+   * @see #deleteRadioTransmissionObserver(Observer)
    * @param observer New observer
    */
-  public abstract void addRadioMediumObserver(Observer observer);
+  public abstract void addRadioTransmissionObserver(Observer observer);
 
   /**
    * @return Radio medium observable
    */
-  public abstract Observable getRadioMediumObservable();
+  public abstract Observable getRadioTransmissionObservable();
 
   /**
    * Deletes an radio medium observer.
    *
-   * @see #addRadioMediumObserver(Observer)
+   * @see #addRadioTransmissionObserver(Observer)
    * @param observer
    *          Observer to delete
    */
-  public abstract void deleteRadioMediumObserver(Observer observer);
+  public abstract void deleteRadioTransmissionObserver(Observer observer);
 
   /**
    * @return Last radio connection finished in the radio medium
diff --git a/tools/cooja/java/org/contikios/cooja/plugins/DGRMConfigurator.java b/tools/cooja/java/org/contikios/cooja/plugins/DGRMConfigurator.java
index 9554d7e90..df6f61d1f 100644
--- a/tools/cooja/java/org/contikios/cooja/plugins/DGRMConfigurator.java
+++ b/tools/cooja/java/org/contikios/cooja/plugins/DGRMConfigurator.java
@@ -111,7 +111,7 @@ public class DGRMConfigurator extends VisPlugin {
     radioMedium = (DirectedGraphMedium) sim.getRadioMedium();
 
     /* Listen for graph updates */
-    radioMedium.addRadioMediumObserver(radioMediumObserver = new Observer() {
+    radioMedium.addRadioTransmissionObserver(radioMediumObserver = new Observer() {
       public void update(Observable obs, Object obj) {
         model.fireTableDataChanged();
       }
@@ -500,7 +500,7 @@ public class DGRMConfigurator extends VisPlugin {
   };
 
   public void closePlugin() {
-    radioMedium.deleteRadioMediumObserver(radioMediumObserver);
+    radioMedium.deleteRadioTransmissionObserver(radioMediumObserver);
   }
 
 }
diff --git a/tools/cooja/java/org/contikios/cooja/plugins/EventListener.java b/tools/cooja/java/org/contikios/cooja/plugins/EventListener.java
index 887503f3d..bcd454076 100644
--- a/tools/cooja/java/org/contikios/cooja/plugins/EventListener.java
+++ b/tools/cooja/java/org/contikios/cooja/plugins/EventListener.java
@@ -223,7 +223,7 @@ public class EventListener extends VisPlugin {
 
     JCheckBox radioMediumCheckBox = new JCheckBox("Radio medium event", false);
     radioMediumCheckBox.putClientProperty("observable", mySimulation
-        .getRadioMedium().getRadioMediumObservable());
+        .getRadioMedium().getRadioTransmissionObservable());
     radioMediumCheckBox.addActionListener(generalCheckBoxListener);
     generalPanel.add(radioMediumCheckBox);
 
diff --git a/tools/cooja/java/org/contikios/cooja/plugins/RadioLogger.java b/tools/cooja/java/org/contikios/cooja/plugins/RadioLogger.java
index 17f5417c2..84fc41737 100644
--- a/tools/cooja/java/org/contikios/cooja/plugins/RadioLogger.java
+++ b/tools/cooja/java/org/contikios/cooja/plugins/RadioLogger.java
@@ -509,7 +509,7 @@ public class RadioLogger extends VisPlugin {
     adjuster.setDynamicAdjustment(true);
     adjuster.packColumns();
 
-    radioMedium.addRadioMediumObserver(radioMediumObserver = new Observer() {
+    radioMedium.addRadioTransmissionObserver(radioMediumObserver = new Observer() {
       @Override
       public void update(Observable obs, Object obj) {
         RadioConnection conn = radioMedium.getLastConnection();
@@ -784,7 +784,7 @@ public class RadioLogger extends VisPlugin {
   @Override
   public void closePlugin() {
     if (radioMediumObserver != null) {
-      radioMedium.deleteRadioMediumObserver(radioMediumObserver);
+      radioMedium.deleteRadioTransmissionObserver(radioMediumObserver);
     }
   }
 
diff --git a/tools/cooja/java/org/contikios/cooja/plugins/skins/TrafficVisualizerSkin.java b/tools/cooja/java/org/contikios/cooja/plugins/skins/TrafficVisualizerSkin.java
index 0cd05c319..c98c51222 100644
--- a/tools/cooja/java/org/contikios/cooja/plugins/skins/TrafficVisualizerSkin.java
+++ b/tools/cooja/java/org/contikios/cooja/plugins/skins/TrafficVisualizerSkin.java
@@ -130,7 +130,7 @@ public class TrafficVisualizerSkin implements VisualizerSkin {
         historyList.clear();
 
         /* Start observing radio medium for transmissions */
-        radioMedium.addRadioMediumObserver(radioMediumObserver);
+        radioMedium.addRadioTransmissionObserver(radioMediumObserver);
 
         /* Fade away arrows */
         simulation.scheduleEvent(ageArrowsTimeEvent, simulation.getSimulationTime() + 100*Simulation.MILLISECOND);
@@ -147,7 +147,7 @@ public class TrafficVisualizerSkin implements VisualizerSkin {
     }
 
     /* Stop observing radio medium */
-    radioMedium.deleteRadioMediumObserver(radioMediumObserver);
+    radioMedium.deleteRadioTransmissionObserver(radioMediumObserver);
   }
 
   @Override
diff --git a/tools/cooja/java/org/contikios/cooja/radiomediums/AbstractRadioMedium.java b/tools/cooja/java/org/contikios/cooja/radiomediums/AbstractRadioMedium.java
index fce97e927..a31b42b3d 100644
--- a/tools/cooja/java/org/contikios/cooja/radiomediums/AbstractRadioMedium.java
+++ b/tools/cooja/java/org/contikios/cooja/radiomediums/AbstractRadioMedium.java
@@ -49,8 +49,10 @@ import org.contikios.cooja.Simulation;
 import org.contikios.cooja.TimeEvent;
 import org.contikios.cooja.interfaces.CustomDataRadio;
 import org.contikios.cooja.interfaces.Radio;
+import org.contikios.cooja.util.ScnObservable;
 import org.jdom.Element;
 
+
 /**
  * Abstract radio medium provides basic functionality for implementing radio
  * mediums.
@@ -90,17 +92,13 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 	public int COUNTER_RX = 0;
 	public int COUNTER_INTERFERED = 0;
 	
-	public class RadioMediumObservable extends Observable {
-		public void setRadioMediumChanged() {
-			setChanged();
-		}
-		public void setRadioMediumChangedAndNotify() {
-			setChanged();
-			notifyObservers();
-		}
-	}
-	
-	private RadioMediumObservable radioMediumObservable = new RadioMediumObservable();
+	/**
+	 * Two Observables to observe the radioMedium and radioTransmissions
+	 * @see addRadioTransmissionObserver
+	 * @see addRadioMediumObserver
+	 */
+	protected ScnObservable radioMediumObservable = new ScnObservable();
+	protected ScnObservable radioTransmissionObservable = new ScnObservable();
 	
 	/**
 	 * This constructor should always be called from implemented radio mediums.
@@ -288,7 +286,7 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 					
 					/* Notify observers */
 					lastConnection = null;
-					radioMediumObservable.setRadioMediumChangedAndNotify();
+					radioTransmissionObservable.setChangedAndNotify();
 				}
 				break;
 				case TRANSMISSION_FINISHED: {
@@ -333,7 +331,7 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 					updateSignalStrengths();
 					
 					/* Notify observers */
-					radioMediumObservable.setRadioMediumChangedAndNotify();
+					radioTransmissionObservable.setChangedAndNotify();
 				}
 				break;
 				case CUSTOM_DATA_TRANSMITTED: {
@@ -348,7 +346,7 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 					/* Custom data object */
 					Object data = ((CustomDataRadio) radio).getLastCustomDataTransmitted();
 					if (data == null) {
-						logger.fatal("No custom data object to forward");
+						logger.fatal("No custom data objecTransmissiont to forward");
 						return;
 					}
 					
@@ -446,6 +444,7 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 		
 		registeredRadios.add(radio);
 		radio.addObserver(radioEventsObserver);
+		radioMediumObservable.setChangedAndNotify();
 		
 		/* Update signal strengths */
 		updateSignalStrengths();
@@ -462,6 +461,8 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 		
 		removeFromActiveConnections(radio);
 		
+		radioMediumObservable.setChangedAndNotify();
+		
 		/* Update signal strengths */
 		updateSignalStrengths();
 	}
@@ -528,10 +529,40 @@ public abstract class AbstractRadioMedium extends RadioMedium {
 		sendRssi.put(radio, rssi);
 	}
 	
+	/**
+	 * Register an observer that gets notified when the radiotransmissions changed.
+	 * E.g. creating new connections.
+	 * This does not include changes in the settings and (de-)registration of radios.
+	 * @see addRadioMediumObserver
+	 * @param observer the Observer to register
+	 */
+	public void addRadioTransmissionObserver(Observer observer) {
+		radioTransmissionObservable.addObserver(observer);
+	}
+	
+	public Observable getRadioTransmissionObservable() {
+		return radioTransmissionObservable;
+	}
+	
+	public void deleteRadioTransmissionObserver(Observer observer) {
+		radioTransmissionObservable.deleteObserver(observer);
+	}
+	
+	/**
+	 * Register an observer that gets notified when the radio medium changed.
+	 * This includes changes in the settings and (de-)registration of radios. 
+	 * This does not include transmissions, etc as these are part of the radio
+	 * and not the radio medium itself.
+	 * @see addRadioTransmissionObserver
+	 * @param observer the Observer to register
+	 */
 	public void addRadioMediumObserver(Observer observer) {
 		radioMediumObservable.addObserver(observer);
 	}
 	
+	/**
+	 * @return the radioMediumObservable
+	 */
 	public Observable getRadioMediumObservable() {
 		return radioMediumObservable;
 	}
diff --git a/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java b/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java
index 57876357c..15806c389 100644
--- a/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java
+++ b/tools/cooja/java/org/contikios/cooja/radiomediums/DirectedGraphMedium.java
@@ -93,8 +93,7 @@ public class DirectedGraphMedium extends AbstractRadioMedium {
     edges.add(e);
     requestEdgeAnalysis();
 
-    ((AbstractRadioMedium.RadioMediumObservable)
-        this.getRadioMediumObservable()).setRadioMediumChangedAndNotify();
+    radioTransmissionObservable.setChangedAndNotify();
   }
 
   public void removeEdge(Edge edge) {
@@ -105,16 +104,15 @@ public class DirectedGraphMedium extends AbstractRadioMedium {
     edges.remove(edge);
     requestEdgeAnalysis();
 
-    ((AbstractRadioMedium.RadioMediumObservable)
-        this.getRadioMediumObservable()).setRadioMediumChangedAndNotify();
+
+    radioTransmissionObservable.setChangedAndNotify();
   }
 
   public void clearEdges() {
     edges.clear();
     requestEdgeAnalysis();
 
-    ((AbstractRadioMedium.RadioMediumObservable)
-        this.getRadioMediumObservable()).setRadioMediumChangedAndNotify();
+    radioTransmissionObservable.setChangedAndNotify();
   }
 
   public Edge[] getEdges() {
@@ -224,6 +222,9 @@ public class DirectedGraphMedium extends AbstractRadioMedium {
 
     this.edgesTable = arrTable;
     edgesDirty = false;
+    
+    /* Radio Medium changed here so notify Observers */
+    radioMediumObservable.setChangedAndNotify();
   }
 
   /**
diff --git a/tools/cooja/java/org/contikios/cooja/util/ScnObservable.java b/tools/cooja/java/org/contikios/cooja/util/ScnObservable.java
new file mode 100644
index 000000000..d922d76a4
--- /dev/null
+++ b/tools/cooja/java/org/contikios/cooja/util/ScnObservable.java
@@ -0,0 +1,16 @@
+package org.contikios.cooja.util;
+
+import java.util.Observable;
+
+public class ScnObservable extends Observable {
+  public void setChangedAndNotify() {
+    setChanged();
+    notifyObservers();
+  }
+	
+  public void setChangedAndNotify(Object obj) {
+    setChanged();
+    notifyObservers(obj);
+  }
+    
+}