diff --git a/plugins/samplesource/testsource/testsourcegui.ui b/plugins/samplesource/testsource/testsourcegui.ui
index 31f2bbd58..90fb1f795 100644
--- a/plugins/samplesource/testsource/testsourcegui.ui
+++ b/plugins/samplesource/testsource/testsourcegui.ui
@@ -480,6 +480,11 @@
          <string>FM</string>
         </property>
        </item>
+       <item>
+        <property name="text">
+         <string>Pul</string>
+        </property>
+       </item>
       </widget>
      </item>
      <item>
diff --git a/plugins/samplesource/testsource/testsourceplugin.cpp b/plugins/samplesource/testsource/testsourceplugin.cpp
index ac8dc459d..ad19169ad 100644
--- a/plugins/samplesource/testsource/testsourceplugin.cpp
+++ b/plugins/samplesource/testsource/testsourceplugin.cpp
@@ -29,7 +29,7 @@
 
 const PluginDescriptor TestSourcePlugin::m_pluginDescriptor = {
 	QString("Test Source input"),
-	QString("4.1.0"),
+	QString("4.2.4"),
 	QString("(c) Edouard Griffiths, F4EXB"),
 	QString("https://github.com/f4exb/sdrangel"),
 	true,
diff --git a/plugins/samplesource/testsource/testsourcesettings.h b/plugins/samplesource/testsource/testsourcesettings.h
index 6d39c22cf..37dd52797 100644
--- a/plugins/samplesource/testsource/testsourcesettings.h
+++ b/plugins/samplesource/testsource/testsourcesettings.h
@@ -37,6 +37,7 @@ struct TestSourceSettings {
         ModulationNone,
         ModulationAM,
         ModulationFM,
+        ModulationPulse,
         ModulationLast
     } Modulation;
 
diff --git a/plugins/samplesource/testsource/testsourcethread.cpp b/plugins/samplesource/testsource/testsourcethread.cpp
index 361a9a04c..432a5aa12 100644
--- a/plugins/samplesource/testsource/testsourcethread.cpp
+++ b/plugins/samplesource/testsource/testsourcethread.cpp
@@ -38,6 +38,11 @@ TestSourceThread::TestSourceThread(SampleSinkFifo* sampleFifo, QObject* parent)
 	m_amModulation(0.5f),
 	m_fmDeviationUnit(0.0f),
 	m_fmPhasor(0.0f),
+    m_pulseWidth(150),
+    m_pulseSampleCount(0),
+    m_pulsePatternCount(0),
+    m_pulsePatternCycle(8),
+    m_pulsePatternPlaces(3),
 	m_samplerate(48000),
 	m_log2Decim(4),
 	m_fcPos(0),
@@ -262,6 +267,48 @@ void TestSourceThread::generate(quint32 chunksize)
             m_buf[i++] = (int16_t) (im * (float) m_amplitudeBitsQ);
         }
         break;
+        case TestSourceSettings::ModulationPulse:
+        {
+            if (m_pulseSampleCount < m_pulseWidth) // sync pattern: 0
+            {
+                m_buf[i++] = m_amplitudeBitsDC;
+                m_buf[i++] = 0;
+            }
+            else if (m_pulseSampleCount < 2*m_pulseWidth) // sync pattern: 1
+            {
+                m_buf[i++] = (int16_t) (m_amplitudeBitsI + m_amplitudeBitsDC);
+                m_buf[i++] = (int16_t) (m_phaseImbalance * (float) m_amplitudeBitsQ);
+            }
+            else if (m_pulseSampleCount < 3*m_pulseWidth) // sync pattern: 0
+            {
+                m_buf[i++] = m_amplitudeBitsDC;
+                m_buf[i++] = 0;
+            }
+            else if (m_pulseSampleCount < (3+m_pulsePatternPlaces)*m_pulseWidth) // binary pattern
+            {
+                uint32_t patPulseSampleCount = m_pulseSampleCount - 3*m_pulseWidth;
+                uint32_t patPulseIndex = patPulseSampleCount / m_pulseWidth;
+                float patFigure = (m_pulsePatternCount & (1<<patPulseIndex)) != 0 ? 0.1 : 0.0; // make binary pattern -20dB vs sync pattern
+                m_buf[i++] = (int16_t) (patFigure * (float) m_amplitudeBitsI) + m_amplitudeBitsDC;
+                m_buf[i++] = (int16_t) (patFigure * (float) m_phaseImbalance * m_amplitudeBitsQ);
+            }
+
+            if (m_pulseSampleCount < (4+m_pulsePatternPlaces)*m_pulseWidth - 1)
+            {
+                m_pulseSampleCount++;
+            }
+            else
+            {
+                if (m_pulsePatternCount < m_pulsePatternCycle - 1) {
+                    m_pulsePatternCount++;
+                } else {
+                    m_pulsePatternCount = 0;
+                }
+
+                m_pulseSampleCount = 0;
+            }
+        }
+        break;
         case TestSourceSettings::ModulationNone:
         default:
         {
diff --git a/plugins/samplesource/testsource/testsourcethread.h b/plugins/samplesource/testsource/testsourcethread.h
index 2decb7774..276a8c506 100644
--- a/plugins/samplesource/testsource/testsourcethread.h
+++ b/plugins/samplesource/testsource/testsourcethread.h
@@ -94,6 +94,11 @@ private:
 	float m_amModulation;
 	float m_fmDeviationUnit;
 	float m_fmPhasor;
+    uint32_t m_pulseWidth; //!< pulse width in number of samples
+    uint32_t m_pulseSampleCount;
+    uint32_t m_pulsePatternCount;
+    uint32_t m_pulsePatternCycle;
+    uint32_t m_pulsePatternPlaces;
 
 	int m_samplerate;
     unsigned int m_log2Decim;