2 files changed, 330 insertions, 455 deletions
diff --git a/gr-digital/examples/packet/packet_rx.grc b/gr-digital/examples/packet/packet_rx.grc
index 9e57e26f13..c231a01218 100644
--- a/gr-digital/examples/packet/packet_rx.grc
+++ b/gr-digital/examples/packet/packet_rx.grc
@@ -24,6 +24,9 @@ options:
     title: ''
     window_size: ''
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 11]
     rotation: 0
     state: enabled
@@ -35,6 +38,9 @@ blocks:
     comment: ''
     value: mark_delays[sps]
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [32, 436.0]
     rotation: 0
     state: enabled
@@ -44,6 +50,9 @@ blocks:
     comment: "Tag Marking Delay for \nCorr Est block, indexed\nby sps.\n\nFound empirically."
     value: '[0, 0, 34, 56, 87, 119]'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [32, 500.0]
     rotation: 0
     state: enabled
@@ -55,6 +64,9 @@ blocks:
     mod: rxmod
     taps: '[1]'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [744, 484.0]
     rotation: 0
     state: enabled
@@ -64,6 +76,9 @@ blocks:
     comment: ''
     value: '32'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 91]
     rotation: 0
     state: enabled
@@ -73,6 +88,9 @@ blocks:
     comment: ''
     value: preamble_select[int(1.0/hdr_dec.rate())]
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [728, 692.0]
     rotation: 0
     state: enabled
@@ -84,6 +102,9 @@ blocks:
       FEC is Dummy'
     value: '[0xac, 0xdd, 0xa4, 0xe2, 0xf2, 0x8c, 0x20, 0xfc]'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [560, 580.0]
     rotation: 0
     state: enabled
@@ -96,6 +117,9 @@ blocks:
     value: '[0xe3, 0x8f, 0xc0, 0xfc, 0x7f, 0xc7, 0xe3, 0x81, 0xc0, 0xff, 0x80, 0x38,
       0xff, 0xf0, 0x38, 0xe0, 0x0f, 0xc0, 0x03, 0x80, 0x00, 0xff, 0xff, 0xc0]'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [728, 580.0]
     rotation: 0
     state: enabled
@@ -105,6 +129,9 @@ blocks:
     comment: ''
     value: '{1: preamble_dummy, 3: preamble_rep}'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [560, 692.0]
     rotation: 0
     state: enabled
@@ -114,6 +141,9 @@ blocks:
     comment: ''
     value: digital.generic_mod(hdr_const, False, sps, True, eb, False, False)
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [560, 516.0]
     rotation: 0
     state: enabled
@@ -128,6 +158,9 @@ blocks:
     tagname: '"amp_est"'
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [376, 316.0]
     rotation: 0
     state: enabled
@@ -144,6 +177,9 @@ blocks:
     type: float
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1320, 496.0]
     rotation: 180
     state: enabled
@@ -158,6 +194,9 @@ blocks:
     tag: '"payload symbols"'
     type: float
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1200, 580.0]
     rotation: 0
     state: enabled
@@ -171,6 +210,9 @@ blocks:
     maxoutbuf: '0'
     minoutbuf: '0'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1440, 356.0]
     rotation: 0
     state: enabled
@@ -184,6 +226,9 @@ blocks:
     maxoutbuf: '0'
     minoutbuf: '0'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1424, 196.0]
     rotation: 0
     state: enabled
@@ -201,6 +246,9 @@ blocks:
     threshold: '0.999'
     threshold_method: digital.THRESHOLD_ABSOLUTE
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [144, 308.0]
     rotation: 0
     state: enabled
@@ -216,6 +264,9 @@ blocks:
     use_snr: 'False'
     w: 6.28/200.0
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1232, 200.0]
     rotation: 0
     state: enabled
@@ -231,6 +282,9 @@ blocks:
     use_snr: 'False'
     w: 6.28/200.0
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1232, 360.0]
     rotation: 0
     state: enabled
@@ -244,6 +298,9 @@ blocks:
     maxoutbuf: '0'
     minoutbuf: '0'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1680, 580.0]
     rotation: 0
     state: enabled
@@ -267,6 +324,9 @@ blocks:
     trigger_tag_key: '"time_est"'
     type: complex
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [856, 244.0]
     rotation: 0
     state: enabled
@@ -287,6 +347,9 @@ blocks:
     taps: psf_taps
     type: ccf
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [568, 276.0]
     rotation: 0
     state: enabled
@@ -300,6 +363,9 @@ blocks:
     maxoutbuf: '0'
     minoutbuf: '0'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [856, 140.0]
     rotation: 180
     state: enabled
@@ -314,6 +380,9 @@ blocks:
     type: eng_float
     value: '0.35'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1408, 11]
     rotation: 0
     state: enabled
@@ -330,6 +399,9 @@ blocks:
     packed: 'True'
     rev_pack: 'False'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1440, 572.0]
     rotation: 0
     state: enabled
@@ -345,6 +417,9 @@ blocks:
     minoutbuf: '0'
     otype: byte
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1424, 140.0]
     rotation: 180
     state: enabled
@@ -360,6 +435,9 @@ blocks:
     value: digital.constellation_calcdist((digital.psk_2()[0]), (digital.psk_2()[1]),
       2, 1).base()
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [544, 11]
     rotation: 0
     state: enabled
@@ -374,6 +452,9 @@ blocks:
     type: ''
     value: ' fec.dummy_decoder.make(8000)'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [192, 11]
     rotation: 0
     state: enabled
@@ -389,6 +470,9 @@ blocks:
     value: digital.header_format_default(digital.packet_utils.default_access_code,
       0)
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [904, 11]
     rotation: 0
     state: enabled
@@ -404,6 +488,9 @@ blocks:
     type: message
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1840, 580.0]
     rotation: 0
     state: enabled
@@ -419,6 +506,9 @@ blocks:
     type: message
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1680, 628.0]
     rotation: 0
     state: enabled
@@ -434,6 +524,9 @@ blocks:
     type: complex
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1024, 196.0]
     rotation: 180
     state: enabled
@@ -449,6 +542,9 @@ blocks:
     type: complex
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1024, 420.0]
     rotation: 180
     state: enabled
@@ -464,6 +560,9 @@ blocks:
     type: complex
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1456, 308.0]
     rotation: 0
     state: enabled
@@ -479,6 +578,9 @@ blocks:
     type: complex
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [664, 220.0]
     rotation: 180
     state: enabled
@@ -494,6 +596,9 @@ blocks:
     type: complex
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [232, 420.0]
     rotation: 180
     state: enabled
@@ -511,6 +616,9 @@ blocks:
     type: complex
     vlen: '1'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [8, 340.0]
     rotation: 0
     state: enabled
@@ -526,6 +634,9 @@ blocks:
     value: digital.constellation_calcdist((digital.psk_2()[0]), (digital.psk_2()[1]),
       2, 1).base()
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [720, 11]
     rotation: 0
     state: enabled
@@ -540,6 +651,9 @@ blocks:
     type: ''
     value: ' fec.dummy_decoder.make(8000)'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [368, 11]
     rotation: 0
     state: enabled
@@ -554,6 +668,9 @@ blocks:
     type: ''
     value: '[0,]'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1256, 11]
     rotation: 0
     state: enabled
@@ -568,6 +685,9 @@ blocks:
     type: eng_float
     value: '2'
   states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
     coordinate: [1096, 11]
     rotation: 0
     state: enabled
@@ -584,7 +704,7 @@ connections:
 - [digital_costas_loop_cc_0_0, '0', digital_constellation_soft_decoder_cf_0_0, '0']
 - [digital_costas_loop_cc_0_0_0, '0', digital_constellation_soft_decoder_cf_0, '0']
 - [digital_costas_loop_cc_0_0_0, '0', pad_sink_3_0, '0']
-- [digital_crc32_async_bb_0, out, pad_sink_0, in0]
+- [digital_crc32_async_bb_0, out, pad_sink_0, in]
 - [digital_header_payload_demux_0, '0', digital_costas_loop_cc_0_0, '0']
 - [digital_header_payload_demux_0, '0', pad_sink_2, '0']
 - [digital_header_payload_demux_0, '1', digital_costas_loop_cc_0_0_0, '0']
@@ -593,7 +713,7 @@ connections:
 - [digital_pfb_clock_sync_xxx_0, '0', pad_sink_5, '0']
 - [digital_protocol_parser_b_0, info, digital_header_payload_demux_0, header_data]
 - [fec_async_decoder_0, out, digital_crc32_async_bb_0, in]
-- [fec_async_decoder_0, out, pad_sink_1, in0]
+- [fec_async_decoder_0, out, pad_sink_1, in]
 - [fec_generic_decoder_0, '0', digital_protocol_parser_b_0, '0']
 - [pad_source_0, '0', digital_corr_est_cc_0, '0']
 
diff --git a/gr-qtgui/apps/grc_qt_example.grc b/gr-qtgui/apps/grc_qt_example.grc
index 320320edcc..0844a8c3e2 100644
--- a/gr-qtgui/apps/grc_qt_example.grc
+++ b/gr-qtgui/apps/grc_qt_example.grc
@@ -1,453 +1,208 @@
-<?xml version='1.0' encoding='ASCII'?>
-<flow_graph>
-  <timestamp>Sat Nov 10 14:58:46 2012</timestamp>
-  <block>
-    <key>options</key>
-    <param>
-      <key>id</key>
-      <value>grc_qt_example</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>qt_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>(10, 10)</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>(10, 170)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_qtgui_range</key>
-    <param>
-      <key>id</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Signal Frequency</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>1000</value>
-    </param>
-    <param>
-      <key>start</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>stop</key>
-      <value>samp_rate/2.0</value>
-    </param>
-    <param>
-      <key>step</key>
-      <value>samp_rate/100.0</value>
-    </param>
-    <param>
-      <key>widget</key>
-      <value>counter_slider</value>
-    </param>
-    <param>
-      <key>orient</key>
-      <value>Qt.Horizontal</value>
-    </param>
-    <param>
-      <key>min_len</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(169, 187)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_qtgui_range</key>
-    <param>
-      <key>id</key>
-      <value>amp</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Signal Amplitude</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>start</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>stop</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>step</key>
-      <value>0.01</value>
-    </param>
-    <param>
-      <key>widget</key>
-      <value>counter_slider</value>
-    </param>
-    <param>
-      <key>orient</key>
-      <value>Qt.Horizontal</value>
-    </param>
-    <param>
-      <key>min_len</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(311, 187)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_qtgui_range</key>
-    <param>
-      <key>id</key>
-      <value>noise</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Noise Amplitude</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0.01</value>
-    </param>
-    <param>
-      <key>start</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>stop</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>step</key>
-      <value>0.01</value>
-    </param>
-    <param>
-      <key>widget</key>
-      <value>counter_slider</value>
-    </param>
-    <param>
-      <key>orient</key>
-      <value>Qt.Horizontal</value>
-    </param>
-    <param>
-      <key>min_len</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(723, 191)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
-    <param>
-      <key>id</key>
-      <value>blocks_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>(511, 96)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>channels_channel_model</key>
-    <param>
-      <key>id</key>
-      <value>channels_channel_model_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>noise_voltage</key>
-      <value>noise</value>
-    </param>
-    <param>
-      <key>freq_offset</key>
-      <value>0.0</value>
-    </param>
-    <param>
-      <key>epsilon</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>taps</key>
-      <value>1.0 + 0.0j</value>
-    </param>
-    <param>
-      <key>seed</key>
-      <value>-42</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(724, 64)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>qtgui_sink_x</key>
-    <param>
-      <key>id</key>
-      <value>qtgui_sink_x_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>name</key>
-      <value>QT GUI Plot</value>
-    </param>
-    <param>
-      <key>fftsize</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>wintype</key>
-      <value>firdes.WIN_BLACKMAN_hARRIS</value>
-    </param>
-    <param>
-      <key>fc</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>bw</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>rate</key>
-      <value>10</value>
-    </param>
-    <param>
-      <key>plotfreq</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>plotwaterfall</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>plottime</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>plotconst</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>freqchangevar</key>
-      <value>None</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(958, 64)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>analog_sig_source_x</key>
-    <param>
-      <key>id</key>
-      <value>analog_sig_source_x_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
-    </param>
-    <param>
-      <key>freq</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>amp</key>
-      <value>amp</value>
-    </param>
-    <param>
-      <key>offset</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(297, 64)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>qtgui_sink_x_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>channels_channel_model_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-</flow_graph>
+options:
+  parameters:
+    author: ''
+    category: Custom
+    cmake_opt: ''
+    comment: ''
+    copyright: ''
+    description: ''
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: qt_gui
+    hier_block_src_path: '.:'
+    id: grc_qt_example
+    max_nouts: '0'
+    output_language: python
+    placement: (0,0)
+    qt_qss_theme: ''
+    realtime_scheduling: ''
+    run: 'True'
+    run_command: '{python} -u {filename}'
+    run_options: prompt
+    sizing_mode: fixed
+    thread_safe_setters: ''
+    title: ''
+    window_size: 1280, 1024
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [10, 10]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: amp
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: Signal Amplitude
+    min_len: '200'
+    orient: Qt.Horizontal
+    rangeType: float
+    start: '0'
+    step: '0.01'
+    stop: '1.0'
+    value: '1'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [311, 187]
+    rotation: 0
+    state: enabled
+- name: freq
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: Signal Frequency
+    min_len: '200'
+    orient: Qt.Horizontal
+    rangeType: float
+    start: '0'
+    step: samp_rate/100.0
+    stop: samp_rate/2.0
+    value: '1000'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [169, 187]
+    rotation: 0
+    state: enabled
+- name: noise
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: Noise Amplitude
+    min_len: '200'
+    orient: Qt.Horizontal
+    rangeType: float
+    start: '0'
+    step: '0.01'
+    stop: '1.0'
+    value: '0.01'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [723, 191]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: '32000'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [10, 170]
+    rotation: 0
+    state: enabled
+- name: analog_sig_source_x_0
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: amp
+    comment: ''
+    freq: freq
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    type: complex
+    waveform: analog.GR_COS_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [256, 60.0]
+    rotation: 0
+    state: enabled
+- name: blocks_throttle_0
+  id: blocks_throttle
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    ignoretag: 'True'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samples_per_second: samp_rate
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [512, 100.0]
+    rotation: 0
+    state: enabled
+- name: channels_channel_model_0
+  id: channels_channel_model
+  parameters:
+    affinity: ''
+    alias: ''
+    block_tags: 'False'
+    comment: ''
+    epsilon: '1.0'
+    freq_offset: '0.0'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    noise_voltage: noise
+    seed: '-42'
+    taps: 1.0 + 0.0j
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [688, 60.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_sink_x_0
+  id: qtgui_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    bw: samp_rate
+    comment: ''
+    fc: '0'
+    fftsize: '1024'
+    gui_hint: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    name: QT GUI Plot
+    plotconst: 'False'
+    plotfreq: 'True'
+    plottime: 'True'
+    plotwaterfall: 'True'
+    rate: '10'
+    showports: 'False'
+    showrf: 'False'
+    type: complex
+    wintype: firdes.WIN_BLACKMAN_hARRIS
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [928, 84.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [analog_sig_source_x_0, '0', blocks_throttle_0, '0']
+- [blocks_throttle_0, '0', channels_channel_model_0, '0']
+- [channels_channel_model_0, '0', qtgui_sink_x_0, '0']
+
+metadata:
+  file_format: 1