diff --git a/sdr/sprectum_analyzer/spectrum_analyzer.grc b/sdr/sprectum_analyzer/spectrum_analyzer.grc
index a9625a4..fc57672 100644
--- a/sdr/sprectum_analyzer/spectrum_analyzer.grc
+++ b/sdr/sprectum_analyzer/spectrum_analyzer.grc
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='utf-8'?>
-<?grc format='1' created='3.7.12'?>
+<?grc format='1' created='3.7.13'?>
 <flow_graph>
   <timestamp>Fri Jun  8 07:13:36 2018</timestamp>
   <block>
@@ -326,7 +326,7 @@
     </param>
     <param>
       <key>step</key>
-      <value>1</value>
+      <value>1000000</value>
     </param>
     <param>
       <key>stop</key>
diff --git a/sdr/sprectum_analyzer/top_block.py b/sdr/sprectum_analyzer/top_block.py
index a54836f..876bc6e 100755
--- a/sdr/sprectum_analyzer/top_block.py
+++ b/sdr/sprectum_analyzer/top_block.py
@@ -3,7 +3,7 @@
 ##################################################
 # GNU Radio Python Flow Graph
 # Title: Top Block
-# Generated: Fri Jun  8 20:25:47 2018
+# Generated: Mon Jul  2 09:37:35 2018
 ##################################################
 
 from distutils.version import StrictVersion
@@ -73,7 +73,7 @@ class top_block(gr.top_block, Qt.QWidget):
         ##################################################
         # Blocks
         ##################################################
-        self._f0_range = Range(50e6, 2e9, 1, 50e6, 200)
+        self._f0_range = Range(50e6, 2e9, 1000000, 50e6, 200)
         self._f0_win = RangeWidget(self._f0_range, self.set_f0, 'f0', "counter_slider", float)
         self.top_grid_layout.addWidget(self._f0_win)
         self._G_RF_range = Range(0, 40, 1, 10, 200)