Cleanup in examples directory
diff --git a/examples/receiver_rtlsdr.grc b/examples/receiver_rtlsdr.grc
new file mode 100644
index 0000000..c48a512
--- /dev/null
+++ b/examples/receiver_rtlsdr.grc
@@ -0,0 +1,907 @@
+<?xml version='1.0' encoding='ASCII'?>
+<flow_graph>
+ <timestamp>Wed Aug 6 13:33:28 2014</timestamp>
+ <block>
+ <key>options</key>
+ <param>
+ <key>id</key>
+ <value>rtl</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>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(13, 9)</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>1000000.026491</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(13, 167)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>variable_slider</key>
+ <param>
+ <key>id</key>
+ <value>fc</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>label</key>
+ <value></value>
+ </param>
+ <param>
+ <key>value</key>
+ <value>940e6</value>
+ </param>
+ <param>
+ <key>min</key>
+ <value>800e6</value>
+ </param>
+ <param>
+ <key>max</key>
+ <value>1000e6</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>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(333, 29)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>variable_slider</key>
+ <param>
+ <key>id</key>
+ <value>g</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>label</key>
+ <value></value>
+ </param>
+ <param>
+ <key>value</key>
+ <value>43</value>
+ </param>
+ <param>
+ <key>min</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>max</key>
+ <value>100</value>
+ </param>
+ <param>
+ <key>num_steps</key>
+ <value>100</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>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(215, 29)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>clk_offset_corrector</key>
+ <param>
+ <key>id</key>
+ <value>clk_offset_corrector_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>ppm</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>samp_rate</key>
+ <value>samp_rate</value>
+ </param>
+ <param>
+ <key>fc</key>
+ <value>936.6e6</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(381, 306)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>gsm_get_bcch_or_ccch_bursts</key>
+ <param>
+ <key>id</key>
+ <value>gsm_get_bcch_or_ccch_bursts_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>d_fn51_start</key>
+ <value>2</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(793, 304)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>gsm_control_channels_decoder</key>
+ <param>
+ <key>id</key>
+ <value>gsm_control_channels_decoder_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(1035, 308)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>gsm_message_printer</key>
+ <param>
+ <key>id</key>
+ <value>gsm_message_printer_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(1072, 371)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>variable_slider</key>
+ <param>
+ <key>id</key>
+ <value>ppm</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>label</key>
+ <value></value>
+ </param>
+ <param>
+ <key>value</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>min</key>
+ <value>-50</value>
+ </param>
+ <param>
+ <key>max</key>
+ <value>50</value>
+ </param>
+ <param>
+ <key>num_steps</key>
+ <value>100</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>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(462, 28)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>gsm_receiver_hier</key>
+ <param>
+ <key>id</key>
+ <value>gsm_receiver_hier_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>input_rate</key>
+ <value>samp_rate</value>
+ </param>
+ <param>
+ <key>osr</key>
+ <value>4</value>
+ </param>
+ <param>
+ <key>arfcn</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(585, 306)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>gsm_clock_offset_control</key>
+ <param>
+ <key>id</key>
+ <value>gsm_clock_offset_control_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>fc</key>
+ <value>fc</value>
+ </param>
+ <param>
+ <key>samp_rate</key>
+ <value>samp_rate</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(488, 171)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>wxgui_fftsink2</key>
+ <param>
+ <key>id</key>
+ <value>wxgui_fftsink2_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>complex</value>
+ </param>
+ <param>
+ <key>title</key>
+ <value>FFT Plot</value>
+ </param>
+ <param>
+ <key>samp_rate</key>
+ <value>samp_rate</value>
+ </param>
+ <param>
+ <key>baseband_freq</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>y_per_div</key>
+ <value>10</value>
+ </param>
+ <param>
+ <key>y_divs</key>
+ <value>10</value>
+ </param>
+ <param>
+ <key>ref_level</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>ref_scale</key>
+ <value>2.0</value>
+ </param>
+ <param>
+ <key>fft_size</key>
+ <value>1024</value>
+ </param>
+ <param>
+ <key>fft_rate</key>
+ <value>15</value>
+ </param>
+ <param>
+ <key>peak_hold</key>
+ <value>False</value>
+ </param>
+ <param>
+ <key>average</key>
+ <value>False</value>
+ </param>
+ <param>
+ <key>avg_alpha</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>win</key>
+ <value>None</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>freqvar</key>
+ <value>None</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(585, 386)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <block>
+ <key>rtlsdr_source</key>
+ <param>
+ <key>id</key>
+ <value>rtlsdr_source_0</value>
+ </param>
+ <param>
+ <key>_enabled</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>type</key>
+ <value>fc32</value>
+ </param>
+ <param>
+ <key>args</key>
+ <value></value>
+ </param>
+ <param>
+ <key>nchan</key>
+ <value>1</value>
+ </param>
+ <param>
+ <key>sample_rate</key>
+ <value>samp_rate</value>
+ </param>
+ <param>
+ <key>freq0</key>
+ <value>fc</value>
+ </param>
+ <param>
+ <key>corr0</key>
+ <value>ppm</value>
+ </param>
+ <param>
+ <key>dc_offset_mode0</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>iq_balance_mode0</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain_mode0</key>
+ <value>True</value>
+ </param>
+ <param>
+ <key>gain0</key>
+ <value>g</value>
+ </param>
+ <param>
+ <key>if_gain0</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>bb_gain0</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>ant0</key>
+ <value></value>
+ </param>
+ <param>
+ <key>bw0</key>
+ <value>250e3</value>
+ </param>
+ <param>
+ <key>freq1</key>
+ <value>100e6</value>
+ </param>
+ <param>
+ <key>corr1</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>dc_offset_mode1</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>iq_balance_mode1</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain_mode1</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain1</key>
+ <value>10</value>
+ </param>
+ <param>
+ <key>if_gain1</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>bb_gain1</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>ant1</key>
+ <value></value>
+ </param>
+ <param>
+ <key>bw1</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>freq2</key>
+ <value>100e6</value>
+ </param>
+ <param>
+ <key>corr2</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>dc_offset_mode2</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>iq_balance_mode2</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain_mode2</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain2</key>
+ <value>10</value>
+ </param>
+ <param>
+ <key>if_gain2</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>bb_gain2</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>ant2</key>
+ <value></value>
+ </param>
+ <param>
+ <key>bw2</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>freq3</key>
+ <value>100e6</value>
+ </param>
+ <param>
+ <key>corr3</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>dc_offset_mode3</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>iq_balance_mode3</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain_mode3</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain3</key>
+ <value>10</value>
+ </param>
+ <param>
+ <key>if_gain3</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>bb_gain3</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>ant3</key>
+ <value></value>
+ </param>
+ <param>
+ <key>bw3</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>freq4</key>
+ <value>100e6</value>
+ </param>
+ <param>
+ <key>corr4</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>dc_offset_mode4</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>iq_balance_mode4</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain_mode4</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>gain4</key>
+ <value>10</value>
+ </param>
+ <param>
+ <key>if_gain4</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>bb_gain4</key>
+ <value>20</value>
+ </param>
+ <param>
+ <key>ant4</key>
+ <value></value>
+ </param>
+ <param>
+ <key>bw4</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>alias</key>
+ <value></value>
+ </param>
+ <param>
+ <key>affinity</key>
+ <value></value>
+ </param>
+ <param>
+ <key>minoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>maxoutbuf</key>
+ <value>0</value>
+ </param>
+ <param>
+ <key>_coordinate</key>
+ <value>(112, 233)</value>
+ </param>
+ <param>
+ <key>_rotation</key>
+ <value>0</value>
+ </param>
+ </block>
+ <connection>
+ <source_block_id>rtlsdr_source_0</source_block_id>
+ <sink_block_id>clk_offset_corrector_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>gsm_clock_offset_control_0</source_block_id>
+ <sink_block_id>clk_offset_corrector_0</sink_block_id>
+ <source_key>ppm</source_key>
+ <sink_key>ppm_msg</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>clk_offset_corrector_0</source_block_id>
+ <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>clk_offset_corrector_0</source_block_id>
+ <sink_block_id>gsm_receiver_hier_0</sink_block_id>
+ <source_key>0</source_key>
+ <sink_key>0</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>gsm_receiver_hier_0</source_block_id>
+ <sink_block_id>gsm_get_bcch_or_ccch_bursts_0</sink_block_id>
+ <source_key>bursts</source_key>
+ <sink_key>bursts</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>gsm_get_bcch_or_ccch_bursts_0</source_block_id>
+ <sink_block_id>gsm_control_channels_decoder_0</sink_block_id>
+ <source_key>bursts</source_key>
+ <sink_key>bursts</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>gsm_control_channels_decoder_0</source_block_id>
+ <sink_block_id>gsm_message_printer_0</sink_block_id>
+ <source_key>msgs</source_key>
+ <sink_key>msgs</sink_key>
+ </connection>
+ <connection>
+ <source_block_id>gsm_receiver_hier_0</source_block_id>
+ <sink_block_id>gsm_clock_offset_control_0</sink_block_id>
+ <source_key>measurements</source_key>
+ <sink_key>measurements</sink_key>
+ </connection>
+</flow_graph>