diff --git a/plugins/samplesink/filesink/filesinkgui.cpp b/plugins/samplesink/filesink/filesinkgui.cpp
index eb21529e4..8e316a226 100644
--- a/plugins/samplesink/filesink/filesinkgui.cpp
+++ b/plugins/samplesink/filesink/filesinkgui.cpp
@@ -327,7 +327,7 @@ void FileSinkGui::tick()
 	}
 }
 
-unsigned int FileSinkSampleRates::m_rates[] = {32, 36, 48, 64, 72};
+unsigned int FileSinkSampleRates::m_rates[] = {32, 48, 64, 72, 128};
 unsigned int FileSinkSampleRates::m_nb_rates = 5;
 
 unsigned int FileSinkSampleRates::getRate(unsigned int rate_index)
diff --git a/sdrbase/dsp/inthalfbandfilter.h b/sdrbase/dsp/inthalfbandfilter.h
index 64ccd9bcc..0d1e589a6 100644
--- a/sdrbase/dsp/inthalfbandfilter.h
+++ b/sdrbase/dsp/inthalfbandfilter.h
@@ -376,7 +376,7 @@ public:
 		}
 	}
 
-    // upsample by 2, from upper half of original spectrum
+    // upsample by 2, move original spectrum to upper half
     bool workInterpolateUpperHalf(Sample* sampleIn, Sample *sampleOut)
     {
         switch(m_state)
@@ -400,8 +400,8 @@ public:
 
             case 1:
                 // insert sample into ring-buffer
-                m_samples[m_ptr][0] = -sampleIn->real();
-                m_samples[m_ptr][1] = -sampleIn->imag();
+				m_samples[m_ptr][0] = sampleIn->imag();
+				m_samples[m_ptr][1] = -sampleIn->real();
 
                 // save result
                 doFIR(sampleOut);
@@ -432,10 +432,78 @@ public:
                 // tell caller we didn't consume the sample
                 return false;
 
+            case 3:
+                // insert sample into ring-buffer
+				m_samples[m_ptr][0] = -sampleIn->real();
+				m_samples[m_ptr][1] = -sampleIn->imag();
+
+                // save result
+                doFIR(sampleOut);
+
+                // advance write-pointer
+                m_ptr = (m_ptr + HB_FILTERORDER) % (HB_FILTERORDER + 1);
+
+                // next state
+                m_state = 4;
+
+                // tell caller we consumed the sample
+                return true;
+
+            case 4:
+                // insert sample into ring-buffer
+                m_samples[m_ptr][0] = 0;
+                m_samples[m_ptr][1] = 0;
+
+                // save result
+                doFIR(sampleOut);
+
+                // advance write-pointer
+                m_ptr = (m_ptr + HB_FILTERORDER) % (HB_FILTERORDER + 1);
+
+                // next state
+                m_state = 5;
+
+                // tell caller we didn't consume the sample
+                return false;
+
+            case 5:
+                // insert sample into ring-buffer
+				m_samples[m_ptr][0] = -sampleIn->imag();
+				m_samples[m_ptr][1] = sampleIn->real();
+
+                // save result
+                doFIR(sampleOut);
+
+                // advance write-pointer
+                m_ptr = (m_ptr + HB_FILTERORDER) % (HB_FILTERORDER + 1);
+
+                // next state
+                m_state = 6;
+
+                // tell caller we consumed the sample
+                return true;
+
+            case 6:
+                // insert sample into ring-buffer
+                m_samples[m_ptr][0] = 0;
+                m_samples[m_ptr][1] = 0;
+
+                // save result
+                doFIR(sampleOut);
+
+                // advance write-pointer
+                m_ptr = (m_ptr + HB_FILTERORDER) % (HB_FILTERORDER + 1);
+
+                // next state
+                m_state = 7;
+
+                // tell caller we didn't consume the sample
+                return false;
+
             default:
                 // insert sample into ring-buffer
-                m_samples[m_ptr][0] = sampleIn->real();
-                m_samples[m_ptr][1] = sampleIn->imag();
+				m_samples[m_ptr][0] = sampleIn->real();
+				m_samples[m_ptr][1] = sampleIn->imag();
 
                 // save result
                 doFIR(sampleOut);
diff --git a/sdrbase/dsp/upchannelizer.cpp b/sdrbase/dsp/upchannelizer.cpp
index 5353d39ab..0f5054f6a 100644
--- a/sdrbase/dsp/upchannelizer.cpp
+++ b/sdrbase/dsp/upchannelizer.cpp
@@ -63,14 +63,23 @@ void UpChannelizer::pull(Sample& sample)
     {
         m_mutex.lock();
 
-        // TODO: handle multiple stages
-
         FilterStages::iterator stage = m_filterStages.begin();
+        FilterStages::iterator last = m_filterStages.end();
+        last--;
 
-        if ((*stage)->work(&m_sampleIn, &sample))
-        {
-            m_sampleSource->pull(m_sampleIn);
-        }
+        // m_sampleIn
+
+		for (; stage != m_filterStages.end(); ++stage)
+		{
+			// let's make it work for one stage only (96 kS/s < SR < 192 kS/s)
+			if(stage == last)
+			{
+				if ((*stage)->work(&m_sampleIn, &sample))
+				{
+					m_sampleSource->pull(m_sampleIn); // get new input sample
+				}
+			}
+		}
 
         m_mutex.unlock();
     }
@@ -162,9 +171,9 @@ void UpChannelizer::applyConfiguration()
 
     m_currentInputSampleRate = m_outputSampleRate / (1 << m_filterStages.size());
 
-    qDebug() << "UpChannelizer::applyConfiguration in=" << m_outputSampleRate
+    qDebug() << "UpChannelizer::applyConfiguration out=" << m_outputSampleRate
             << ", req=" << m_requestedInputSampleRate
-            << ", out=" << m_currentInputSampleRate
+            << ", in=" << m_currentInputSampleRate
             << ", fc=" << m_currentCenterFrequency;
 
     if (m_sampleSource != 0)