<?xml version='1.0' encoding='ASCII'?>
<flow_graph>
  <timestamp>Mon Jan 14 11:00:42 2013</timestamp>
  <block>
    <key>options</key>
    <param>
      <key>id</key>
      <value>pam_timing</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>title</key>
      <value></value>
    </param>
    <param>
      <key>author</key>
      <value></value>
    </param>
    <param>
      <key>description</key>
      <value></value>
    </param>
    <param>
      <key>window_size</key>
      <value>1280, 1024</value>
    </param>
    <param>
      <key>generate_options</key>
      <value>wx_gui</value>
    </param>
    <param>
      <key>category</key>
      <value>Custom</value>
    </param>
    <param>
      <key>run_options</key>
      <value>prompt</value>
    </param>
    <param>
      <key>run</key>
      <value>True</value>
    </param>
    <param>
      <key>max_nouts</key>
      <value>0</value>
    </param>
    <param>
      <key>realtime_scheduling</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(-1, 0)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable_slider</key>
    <param>
      <key>id</key>
      <value>beta</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>label</key>
      <value>Timing Beta</value>
    </param>
    <param>
      <key>value</key>
      <value>0</value>
    </param>
    <param>
      <key>min</key>
      <value>0.0</value>
    </param>
    <param>
      <key>max</key>
      <value>0.1</value>
    </param>
    <param>
      <key>num_steps</key>
      <value>1000</value>
    </param>
    <param>
      <key>style</key>
      <value>wx.SL_HORIZONTAL</value>
    </param>
    <param>
      <key>converver</key>
      <value>float_converter</value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(668, 5)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>180</value>
    </param>
  </block>
  <block>
    <key>variable_slider</key>
    <param>
      <key>id</key>
      <value>alpha</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>label</key>
      <value>Timing Alpha</value>
    </param>
    <param>
      <key>value</key>
      <value>0</value>
    </param>
    <param>
      <key>min</key>
      <value>0</value>
    </param>
    <param>
      <key>max</key>
      <value>1</value>
    </param>
    <param>
      <key>num_steps</key>
      <value>1000</value>
    </param>
    <param>
      <key>style</key>
      <value>wx.SL_HORIZONTAL</value>
    </param>
    <param>
      <key>converver</key>
      <value>float_converter</value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(552, 4)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>random_source_x</key>
    <param>
      <key>id</key>
      <value>random_source_x</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>byte</value>
    </param>
    <param>
      <key>min</key>
      <value>0</value>
    </param>
    <param>
      <key>max</key>
      <value>const.arity()</value>
    </param>
    <param>
      <key>num_samps</key>
      <value>10000000</value>
    </param>
    <param>
      <key>repeat</key>
      <value>True</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(-1, 163)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>gr_chunks_to_symbols_xx</key>
    <param>
      <key>id</key>
      <value>gr_chunks_to_symbols_xx</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>in_type</key>
      <value>byte</value>
    </param>
    <param>
      <key>out_type</key>
      <value>complex</value>
    </param>
    <param>
      <key>symbol_table</key>
      <value>const.points()</value>
    </param>
    <param>
      <key>dimension</key>
      <value>1</value>
    </param>
    <param>
      <key>num_ports</key>
      <value>1</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(203, 178)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>gr_multiply_const_vxx</key>
    <param>
      <key>id</key>
      <value>gr_multiply_const_vxx_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>complex</value>
    </param>
    <param>
      <key>const</key>
      <value>sig_amp</value>
    </param>
    <param>
      <key>vlen</key>
      <value>1</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(651, 186)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>gr_channel_model</key>
    <param>
      <key>id</key>
      <value>gr_channel_model_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>noise_voltage</key>
      <value>noise_amp</value>
    </param>
    <param>
      <key>freq_offset</key>
      <value>freq_offset</value>
    </param>
    <param>
      <key>epsilon</key>
      <value>interpratio</value>
    </param>
    <param>
      <key>taps</key>
      <value>1.0</value>
    </param>
    <param>
      <key>seed</key>
      <value>42</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(73, 354)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>gr_throttle</key>
    <param>
      <key>id</key>
      <value>gr_throttle_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>complex</value>
    </param>
    <param>
      <key>samples_per_second</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>vlen</key>
      <value>1</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(274, 384)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable</key>
    <param>
      <key>id</key>
      <value>sig_amp</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>value</key>
      <value>1</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(662, 128)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable_slider</key>
    <param>
      <key>id</key>
      <value>interpratio</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>label</key>
      <value>Timing Offset</value>
    </param>
    <param>
      <key>value</key>
      <value>1.00</value>
    </param>
    <param>
      <key>min</key>
      <value>0.99</value>
    </param>
    <param>
      <key>max</key>
      <value>1.01</value>
    </param>
    <param>
      <key>num_steps</key>
      <value>1000</value>
    </param>
    <param>
      <key>style</key>
      <value>wx.SL_HORIZONTAL</value>
    </param>
    <param>
      <key>converver</key>
      <value>float_converter</value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(-1, 465)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>180</value>
    </param>
  </block>
  <block>
    <key>variable_slider</key>
    <param>
      <key>id</key>
      <value>noise_amp</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>label</key>
      <value>Channel Noise</value>
    </param>
    <param>
      <key>value</key>
      <value>0</value>
    </param>
    <param>
      <key>min</key>
      <value>0</value>
    </param>
    <param>
      <key>max</key>
      <value>1.0</value>
    </param>
    <param>
      <key>num_steps</key>
      <value>1000</value>
    </param>
    <param>
      <key>style</key>
      <value>wx.SL_HORIZONTAL</value>
    </param>
    <param>
      <key>converver</key>
      <value>float_converter</value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(114, 465)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable_slider</key>
    <param>
      <key>id</key>
      <value>freq_offset</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>label</key>
      <value>Frequency Offset</value>
    </param>
    <param>
      <key>value</key>
      <value>0</value>
    </param>
    <param>
      <key>min</key>
      <value>-0.5</value>
    </param>
    <param>
      <key>max</key>
      <value>0.5</value>
    </param>
    <param>
      <key>num_steps</key>
      <value>1000</value>
    </param>
    <param>
      <key>style</key>
      <value>wx.SL_HORIZONTAL</value>
    </param>
    <param>
      <key>converver</key>
      <value>float_converter</value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(236, 465)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable</key>
    <param>
      <key>id</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>value</key>
      <value>32000</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(282, 324)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable</key>
    <param>
      <key>id</key>
      <value>const</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>value</key>
      <value>digital.qpsk_constellation()</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(206, 116)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>import</key>
    <param>
      <key>id</key>
      <value>import_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>import</key>
      <value>from gnuradio import digital</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(-1, 61)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable</key>
    <param>
      <key>id</key>
      <value>rolloff</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>value</key>
      <value>.35</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(459, 262)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable</key>
    <param>
      <key>id</key>
      <value>nfilts</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>value</key>
      <value>32</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(539, 262)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>gr_pfb_clock_sync_xxx</key>
    <param>
      <key>id</key>
      <value>gr_pfb_clock_sync_xxx_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>ccf</value>
    </param>
    <param>
      <key>sps</key>
      <value>spb</value>
    </param>
    <param>
      <key>alpha</key>
      <value>alpha</value>
    </param>
    <param>
      <key>beta</key>
      <value>beta</value>
    </param>
    <param>
      <key>taps</key>
      <value>firdes.root_raised_cosine(nfilts, nfilts*spb, 1.0, rolloff, 44*nfilts)</value>
    </param>
    <param>
      <key>filter_size</key>
      <value>nfilts</value>
    </param>
    <param>
      <key>init_phase</key>
      <value>16</value>
    </param>
    <param>
      <key>max_dev</key>
      <value>1.5</value>
    </param>
    <param>
      <key>osps</key>
      <value>1</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(444, 331)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>blks2_pfb_arb_resampler_ccf</key>
    <param>
      <key>id</key>
      <value>blks2_pfb_arb_resampler_ccf_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>rate</key>
      <value>spb</value>
    </param>
    <param>
      <key>taps</key>
      <value>firdes.root_raised_cosine(nfilts, nfilts, 1.0, rolloff, 44*nfilts)</value>
    </param>
    <param>
      <key>size</key>
      <value>nfilts</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(438, 171)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>wxgui_scopesink2</key>
    <param>
      <key>id</key>
      <value>wxgui_scopesink2_0_0_1</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>complex</value>
    </param>
    <param>
      <key>title</key>
      <value>Error</value>
    </param>
    <param>
      <key>samp_rate</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>v_scale</key>
      <value>.5</value>
    </param>
    <param>
      <key>v_offset</key>
      <value>0</value>
    </param>
    <param>
      <key>t_scale</key>
      <value>0</value>
    </param>
    <param>
      <key>ac_couple</key>
      <value>False</value>
    </param>
    <param>
      <key>xy_mode</key>
      <value>False</value>
    </param>
    <param>
      <key>num_inputs</key>
      <value>1</value>
    </param>
    <param>
      <key>win_size</key>
      <value></value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value>notebook_0,3</value>
    </param>
    <param>
      <key>trig_mode</key>
      <value>gr.gr_TRIG_MODE_AUTO</value>
    </param>
    <param>
      <key>y_axis_label</key>
      <value>Counts</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(826, 112)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>wxgui_scopesink2</key>
    <param>
      <key>id</key>
      <value>wxgui_scopesink2_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>complex</value>
    </param>
    <param>
      <key>title</key>
      <value>Scope Plot</value>
    </param>
    <param>
      <key>samp_rate</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>v_scale</key>
      <value>0</value>
    </param>
    <param>
      <key>v_offset</key>
      <value>0</value>
    </param>
    <param>
      <key>t_scale</key>
      <value>0</value>
    </param>
    <param>
      <key>ac_couple</key>
      <value>False</value>
    </param>
    <param>
      <key>xy_mode</key>
      <value>False</value>
    </param>
    <param>
      <key>num_inputs</key>
      <value>1</value>
    </param>
    <param>
      <key>win_size</key>
      <value></value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>trig_mode</key>
      <value>gr.gr_TRIG_MODE_AUTO</value>
    </param>
    <param>
      <key>y_axis_label</key>
      <value>Counts</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(829, 266)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>wxgui_scopesink2</key>
    <param>
      <key>id</key>
      <value>wxgui_scopesink2_0_0_0_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>float</value>
    </param>
    <param>
      <key>title</key>
      <value>Scope Plot</value>
    </param>
    <param>
      <key>samp_rate</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>v_scale</key>
      <value>1.25</value>
    </param>
    <param>
      <key>v_offset</key>
      <value>0</value>
    </param>
    <param>
      <key>t_scale</key>
      <value>0</value>
    </param>
    <param>
      <key>ac_couple</key>
      <value>False</value>
    </param>
    <param>
      <key>xy_mode</key>
      <value>False</value>
    </param>
    <param>
      <key>num_inputs</key>
      <value>1</value>
    </param>
    <param>
      <key>win_size</key>
      <value></value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value>notebook_0,2</value>
    </param>
    <param>
      <key>trig_mode</key>
      <value>gr.gr_TRIG_MODE_AUTO</value>
    </param>
    <param>
      <key>y_axis_label</key>
      <value>Counts</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(824, 485)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>wxgui_scopesink2</key>
    <param>
      <key>id</key>
      <value>wxgui_scopesink2_0_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>float</value>
    </param>
    <param>
      <key>title</key>
      <value>Error</value>
    </param>
    <param>
      <key>samp_rate</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>v_scale</key>
      <value>3</value>
    </param>
    <param>
      <key>v_offset</key>
      <value>0</value>
    </param>
    <param>
      <key>t_scale</key>
      <value>0</value>
    </param>
    <param>
      <key>ac_couple</key>
      <value>False</value>
    </param>
    <param>
      <key>xy_mode</key>
      <value>False</value>
    </param>
    <param>
      <key>num_inputs</key>
      <value>1</value>
    </param>
    <param>
      <key>win_size</key>
      <value></value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value>notebook_0,0</value>
    </param>
    <param>
      <key>trig_mode</key>
      <value>gr.gr_TRIG_MODE_AUTO</value>
    </param>
    <param>
      <key>y_axis_label</key>
      <value>Counts</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(829, 358)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>wxgui_scopesink2</key>
    <param>
      <key>id</key>
      <value>wxgui_scopesink2_0_0_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>type</key>
      <value>float</value>
    </param>
    <param>
      <key>title</key>
      <value>Scope Plot</value>
    </param>
    <param>
      <key>samp_rate</key>
      <value>samp_rate</value>
    </param>
    <param>
      <key>v_scale</key>
      <value>9</value>
    </param>
    <param>
      <key>v_offset</key>
      <value>0</value>
    </param>
    <param>
      <key>t_scale</key>
      <value>0</value>
    </param>
    <param>
      <key>ac_couple</key>
      <value>False</value>
    </param>
    <param>
      <key>xy_mode</key>
      <value>False</value>
    </param>
    <param>
      <key>num_inputs</key>
      <value>1</value>
    </param>
    <param>
      <key>win_size</key>
      <value></value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value>notebook_0,1</value>
    </param>
    <param>
      <key>trig_mode</key>
      <value>gr.gr_TRIG_MODE_AUTO</value>
    </param>
    <param>
      <key>y_axis_label</key>
      <value>Counts</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(754, 607)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>notebook</key>
    <param>
      <key>id</key>
      <value>notebook_0</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>style</key>
      <value>wx.NB_TOP</value>
    </param>
    <param>
      <key>labels</key>
      <value>['error', 'phase', 'freq', 'Resampled Signal']</value>
    </param>
    <param>
      <key>grid_pos</key>
      <value></value>
    </param>
    <param>
      <key>notebook</key>
      <value></value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(380, 511)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <block>
    <key>variable</key>
    <param>
      <key>id</key>
      <value>spb</value>
    </param>
    <param>
      <key>_enabled</key>
      <value>True</value>
    </param>
    <param>
      <key>value</key>
      <value>4.2563</value>
    </param>
    <param>
      <key>_coordinate</key>
      <value>(300, 0)</value>
    </param>
    <param>
      <key>_rotation</key>
      <value>0</value>
    </param>
  </block>
  <connection>
    <source_block_id>gr_channel_model_0</source_block_id>
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    <sink_key>0</sink_key>
  </connection>
  <connection>
    <source_block_id>gr_throttle_0</source_block_id>
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    <sink_key>0</sink_key>
  </connection>
  <connection>
    <source_block_id>gr_pfb_clock_sync_xxx_0</source_block_id>
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  <connection>
    <source_block_id>gr_multiply_const_vxx_0</source_block_id>
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  <connection>
    <source_block_id>blks2_pfb_arb_resampler_ccf_0</source_block_id>
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  </connection>
  <connection>
    <source_block_id>gr_multiply_const_vxx_0</source_block_id>
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  <connection>
    <source_block_id>gr_chunks_to_symbols_xx</source_block_id>
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    <sink_key>0</sink_key>
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  <connection>
    <source_block_id>random_source_x</source_block_id>
    <sink_block_id>gr_chunks_to_symbols_xx</sink_block_id>
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    <sink_key>0</sink_key>
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  <connection>
    <source_block_id>gr_pfb_clock_sync_xxx_0</source_block_id>
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    <sink_key>0</sink_key>
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  <connection>
    <source_block_id>gr_pfb_clock_sync_xxx_0</source_block_id>
    <sink_block_id>wxgui_scopesink2_0_0</sink_block_id>
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  <connection>
    <source_block_id>gr_pfb_clock_sync_xxx_0</source_block_id>
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    <sink_key>0</sink_key>
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</flow_graph>