--- a/src/spectrum/helper/waveform-generator-helper.cc	Fri Sep 30 14:25:23 2011 -0700
+++ b/src/spectrum/helper/waveform-generator-helper.cc	Tue Oct 04 18:40:50 2011 +0200
@@ -98,7 +98,7 @@
       dev->SetPhy (phy);
 
       NS_ASSERT (node);
-      phy->SetMobility (node);
+      phy->SetMobility (node->GetObject<MobilityModel> ());
 
       NS_ASSERT (dev);
       phy->SetDevice (dev);