diff --git a/sdrbase/gui/glspectrum.cpp b/sdrbase/gui/glspectrum.cpp
index 579e91524..ffdaf9185 100644
--- a/sdrbase/gui/glspectrum.cpp
+++ b/sdrbase/gui/glspectrum.cpp
@@ -170,8 +170,8 @@ void GLSpectrum::setDecay(int decay)
 	m_decay = decay;
 	if(m_decay < -2)
 		m_decay = -2;
-	else if(m_decay > 2)
-		m_decay = 2;
+	else if(m_decay > 10)
+		m_decay = 10;
 }
 
 void GLSpectrum::setSampleRate(qint32 sampleRate)
diff --git a/sdrbase/gui/glspectrumgui.ui b/sdrbase/gui/glspectrumgui.ui
index 25122c80b..ccaba4635 100644
--- a/sdrbase/gui/glspectrumgui.ui
+++ b/sdrbase/gui/glspectrumgui.ui
@@ -271,6 +271,46 @@
        <string>+2</string>
       </property>
      </item>
+     <item>
+      <property name="text">
+       <string>+3</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+4</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+5</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+6</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+7</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+8</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+9</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>+10</string>
+      </property>
+     </item>
     </widget>
    </item>
    <item row="2" column="1" colspan="3">