diff --git a/sdrbase/dsp/samplesourcefifo.cpp b/sdrbase/dsp/samplesourcefifo.cpp
index f9ce51b1a..fce398c2b 100644
--- a/sdrbase/dsp/samplesourcefifo.cpp
+++ b/sdrbase/dsp/samplesourcefifo.cpp
@@ -20,17 +20,25 @@
 SampleSourceFifo::SampleSourceFifo(uint32_t size, uint32_t samplesChunkSize) :
     m_size(size),
     m_samplesChunkSize(samplesChunkSize),
-    m_ir(0),
-    m_iw(size/2)
+    m_init(false)
 {
     assert(samplesChunkSize <= m_size/4);
     m_data.resize(2*m_size);
+    init();
 }
 
 
 SampleSourceFifo::~SampleSourceFifo()
 {}
 
+void SampleSourceFifo::init()
+{
+    memset(&m_data[0], 0, sizeof(2*m_size*sizeof(Sample)));
+    m_ir = 0;
+    m_iw = m_samplesChunkSize*2;
+    m_init = true;
+}
+
 void SampleSourceFifo::read(SampleVector::iterator& beginRead, unsigned int nbSamples)
 {
     QMutexLocker mutexLocker(&m_mutex);
@@ -42,7 +50,12 @@ void SampleSourceFifo::read(SampleVector::iterator& beginRead, unsigned int nbSa
 
     int i_delta = m_iw - m_ir;
 
-    if (i_delta > 0)
+    if (m_init)
+    {
+        emit dataWrite();
+        m_init = false;
+    }
+    else if (i_delta > 0)
     {
         if (i_delta < m_samplesChunkSize)
         {
diff --git a/sdrbase/dsp/samplesourcefifo.h b/sdrbase/dsp/samplesourcefifo.h
index 0c6ba0070..8f41179ba 100644
--- a/sdrbase/dsp/samplesourcefifo.h
+++ b/sdrbase/dsp/samplesourcefifo.h
@@ -33,6 +33,7 @@ public:
 
     unsigned int getChunkSize() const { return m_samplesChunkSize; }
 
+    void init();
     /** begin read at current read point for the given length */
     void read(SampleVector::iterator& beginRead, unsigned int nbSamples);
 
@@ -47,6 +48,7 @@ private:
     SampleVector m_data;
     uint32_t m_iw;
     uint32_t m_ir;
+    bool m_init;
     QMutex m_mutex;
 
 signals: