diff --git a/sdrgui/gui/glspectrumview.cpp b/sdrgui/gui/glspectrumview.cpp
index a3b5ce433..c6cfb3e9e 100644
--- a/sdrgui/gui/glspectrumview.cpp
+++ b/sdrgui/gui/glspectrumview.cpp
@@ -2706,7 +2706,7 @@ void GLSpectrumView::applyChanges()
 
         if (m_sampleRate > 0)
         {
-            float timeScaleDiv = ((float)m_sampleRate / (float)m_timingRate) * (m_ssbSpectrum ? 2 : 1);
+            float timeScaleDiv = ((float)m_sampleRate / (float)m_timingRate);
             float halfFFTSize = m_fftSize / 2;
 
             if (halfFFTSize > m_fftOverlap) {
@@ -2800,7 +2800,7 @@ void GLSpectrumView::applyChanges()
 
         if (m_sampleRate > 0)
         {
-            float timeScaleDiv = ((float)m_sampleRate / (float)m_timingRate) * (m_ssbSpectrum ? 2 : 1);
+            float timeScaleDiv = ((float)m_sampleRate / (float)m_timingRate);
             float halfFFTSize = m_fftSize / 2;
 
             if (halfFFTSize > m_fftOverlap) {
@@ -4329,7 +4329,10 @@ void GLSpectrumView::zoom(const QPointF& p, int y)
         float zoomFreq = m_frequencyScale.getRangeMin() + pwx*m_frequencyScale.getRange();
 
         // Calculate current centre frequency
-        float currentCF = (m_frequencyZoomFactor == 1) ? m_centerFrequency : ((m_frequencyZoomPos - 0.5) * m_sampleRate + m_centerFrequency);
+        int adjSampleRate = m_ssbSpectrum ? m_sampleRate/2 : m_sampleRate;
+        qint64 adjCenterFrequency = m_centerFrequency + (m_ssbSpectrum ? m_sampleRate/4 : 0);
+        float currentCF = (m_frequencyZoomFactor == 1) ?
+            adjCenterFrequency : (m_frequencyZoomPos - 0.5) * adjSampleRate + adjCenterFrequency;
 
         // Calculate difference from frequency under cursor to centre frequency
         float freqDiff = (currentCF - zoomFreq);
@@ -4360,7 +4363,7 @@ void GLSpectrumView::zoom(const QPointF& p, int y)
         float zoomedCF = zoomFreq + zoomedFreqDiff;
 
         // Calculate zoom position which will set the desired center frequency
-        float zoomPos = (zoomedCF - m_centerFrequency) / m_sampleRate + 0.5;
+        float zoomPos = (zoomedCF - adjCenterFrequency) / adjSampleRate + 0.5;
         zoomPos = std::max(0.0f, zoomPos);
         zoomPos = std::min(1.0f, zoomPos);