--- a/src/spectrum/model/spectrum-analyzer.cc	
+++ a/src/spectrum/model/spectrum-analyzer.cc	
@@ -41,7 +41,7 @@ 
     m_spectrumModel (0),
     m_sumPowerSpectralDensity (0),
     m_resolution (MilliSeconds (50)),
-    m_active (false)
+    m_reportEvent ()
 {
   NS_LOG_FUNCTION (this);
 }
@@ -63,6 +63,10 @@ 
   m_spectrumModel = 0;
   m_sumPowerSpectralDensity = 0;
   m_energySpectralDensity = 0;
+  if (m_reportEvent.IsRunning ())
+    {
+      m_reportEvent.Cancel ();
+    }
   SpectrumPhy::DoDispose ();
 }
 
@@ -208,15 +212,12 @@ 
   (*avgPowerSpectralDensity) += m_noisePowerSpectralDensity;
   (*m_energySpectralDensity) = 0;
 
+  m_reportEvent = Simulator::Schedule (m_resolution, &SpectrumAnalyzer::GenerateReport, this);
+
   NS_LOG_INFO ("generating report");
   m_averagePowerSpectralDensityReportTrace (avgPowerSpectralDensity);
 
   *avgPowerSpectralDensity = 0;
-
-  if (m_active)
-    {
-      Simulator::Schedule (m_resolution, &SpectrumAnalyzer::GenerateReport, this);
-    }
 }
 
 
@@ -239,11 +240,9 @@ 
 SpectrumAnalyzer::Start ()
 {
   NS_LOG_FUNCTION (this);
-  if (!m_active)
+  if (!m_reportEvent.IsRunning ())
     {
-      NS_LOG_LOGIC ("activating");
-      m_active = true;
-      Simulator::Schedule (m_resolution, &SpectrumAnalyzer::GenerateReport, this);
+      m_reportEvent = Simulator::Schedule (m_resolution, &SpectrumAnalyzer::GenerateReport, this);
     }
 }
 
@@ -251,7 +250,7 @@ 
 void
 SpectrumAnalyzer::Stop ()
 {
-  m_active = false;
+  m_reportEvent.Cancel ();
 }
 
 } // namespace ns3
--- a/src/spectrum/model/spectrum-analyzer.h	
+++ a/src/spectrum/model/spectrum-analyzer.h	
@@ -131,7 +131,7 @@ 
   double m_noisePowerSpectralDensity;             //!< Noise power spectral density
   Time m_resolution;                              //!< Time resolution
   Time m_lastChangeTime;                          //!< When the last update happened
-  bool m_active;                                  //!< True if the analyzer is active
+  EventId m_reportEvent;                          //!< Report event
 
   /// TracedCallback - average power spectral density report.
   TracedCallback<Ptr<const SpectrumValue> > m_averagePowerSpectralDensityReportTrace;