diff --git a/sdrgui/dsp/scopevisng.cpp b/sdrgui/dsp/scopevisng.cpp
index 0d50a1548..ed01d81f0 100644
--- a/sdrgui/dsp/scopevisng.cpp
+++ b/sdrgui/dsp/scopevisng.cpp
@@ -465,10 +465,10 @@ int ScopeVisNG::processTraces(const SampleVector::const_iterator& cbegin, const
                 }
                 else if (projectionType == Projector::ProjectionMagDB)
                 {
-                   // there is no processing advantage in direct calculation without projector
-//                    uint32_t magsq = begin->m_real*begin->m_real + begin->m_imag*begin->m_imag;
-//                    v = ((log10f(magsq/1073741824.0f)*0.2f - 2.0f*itData->m_ofs) + 2.0f)*itData->m_amp - 1.0f;
-                    float pdB = (*itCtl)->m_projector.run(*begin);
+                    Real re = begin->m_real / SDR_RX_SCALEF;
+                    Real im = begin->m_imag / SDR_RX_SCALEF;
+                    double magsq = re*re + im*im;
+                    float pdB = log10f(magsq) * 10.0f;
                     float p = pdB - (100.0f * itData->m_ofs);
                     v = ((p/50.0f) + 2.0f)*itData->m_amp - 1.0f;
 
@@ -476,28 +476,29 @@ int ScopeVisNG::processTraces(const SampleVector::const_iterator& cbegin, const
                     {
                         if (traceCount == shift)
                         {
-                            (*itCtl)->m_maxPow = -200.0f;
+                            (*itCtl)->m_maxPow = 0.0f;
                             (*itCtl)->m_sumPow = 0.0f;
                             (*itCtl)->m_nbPow = 1;
                         }
 
-                        if (pdB > -200.0f)
+                        if (magsq > 0.0f)
                         {
-                            if (pdB > (*itCtl)->m_maxPow)
+                            if (magsq > (*itCtl)->m_maxPow)
                             {
-                                (*itCtl)->m_maxPow = pdB;
+                                (*itCtl)->m_maxPow = magsq;
                             }
 
-                            (*itCtl)->m_sumPow += pdB;
+                            (*itCtl)->m_sumPow += magsq;
                             (*itCtl)->m_nbPow++;
                         }
                     }
 
                     if ((m_nbSamples == 1) && ((*itCtl)->m_nbPow > 0)) // on last sample create power display overlay
                     {
-                        double avgPow = (*itCtl)->m_sumPow / (*itCtl)->m_nbPow;
-                        double peakToAvgPow = (*itCtl)->m_maxPow - avgPow;
-                        itData->m_textOverlay = QString("%1  %2  %3").arg((*itCtl)->m_maxPow, 0, 'f', 1).arg(avgPow, 0, 'f', 1).arg(peakToAvgPow, 4, 'f', 1, ' ');
+                        double avgPow = log10f((*itCtl)->m_sumPow / (*itCtl)->m_nbPow)*10.0;
+                        double peakPow = log10f((*itCtl)->m_maxPow)*10.0;
+                        double peakToAvgPow = peakPow - avgPow;
+                        itData->m_textOverlay = QString("%1  %2  %3").arg(peakPow, 0, 'f', 1).arg(avgPow, 0, 'f', 1).arg(peakToAvgPow, 4, 'f', 1, ' ');
                         (*itCtl)->m_nbPow = 0;
                     }
                 }
diff --git a/sdrgui/dsp/scopevisng.h b/sdrgui/dsp/scopevisng.h
index dc9f31cc9..2560fb3b0 100644
--- a/sdrgui/dsp/scopevisng.h
+++ b/sdrgui/dsp/scopevisng.h
@@ -681,8 +681,8 @@ private:
     {
         Projector m_projector;    //!< Projector transform from complex trace to real (displayable) trace
         uint32_t m_traceCount[2]; //!< Count of samples processed (double buffered)
-        Real m_maxPow;            //!< Maximum power over the current trace for MagDB overlay display
-        Real m_sumPow;            //!< Cumulative power over the current trace for MagDB overlay display
+        double m_maxPow;          //!< Maximum power over the current trace for MagDB overlay display
+        double m_sumPow;          //!< Cumulative power over the current trace for MagDB overlay display
         int m_nbPow;              //!< Number of power samples over the current trace for MagDB overlay display
 
         TraceControl() : m_projector(Projector::ProjectionReal)