feat(gnuradio): Start working on a general purpose reciever

1 files changed, 817 insertions, 0 deletions

diff --git a/gnuradio/waterfall.grc b/gnuradio/waterfall.grc
new file mode 100644
index 0000000..dd795ba
--- /dev/null
+++ b/gnuradio/waterfall.grc
@@ -0,0 +1,817 @@
+options:
+  parameters:
+    author: ''
+    catch_exceptions: 'True'
+    category: '[GRC Hier Blocks]'
+    cmake_opt: ''
+    comment: ''
+    copyright: ''
+    description: ''
+    gen_cmake: 'On'
+    gen_linking: dynamic
+    generate_options: qt_gui
+    hier_block_src_path: '.:'
+    id: waterfall
+    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: Not titled yet
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: btn_guard_fm_output
+  id: variable_struct
+  parameters:
+    comment: ''
+    field0: TYPE
+    field1: Pressed
+    field10: ''
+    field11: ''
+    field12: ''
+    field13: ''
+    field14: ''
+    field15: ''
+    field16: ''
+    field17: ''
+    field18: ''
+    field19: ''
+    field2: Released
+    field3: GUIHint
+    field4: CALLBACK
+    field5: Label
+    field6: ''
+    field7: ''
+    field8: ''
+    field9: ''
+    value0: '"QT GUI Toggle Button"'
+    value1: 'True'
+    value10: '0'
+    value11: '0'
+    value12: '0'
+    value13: '0'
+    value14: '0'
+    value15: '0'
+    value16: '0'
+    value17: '0'
+    value18: '0'
+    value19: '0'
+    value2: 'False'
+    value3: '"ranges@1"'
+    value4: '"tb.epy_block_0.set"'
+    value5: '"Listen"'
+    value6: '0'
+    value7: '0'
+    value8: '0'
+    value9: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [744, 524.0]
+    rotation: 0
+    state: enabled
+- name: btn_guard_fm_output_0
+  id: variable_struct
+  parameters:
+    comment: ''
+    field0: TYPE
+    field1: Pressed
+    field10: ''
+    field11: ''
+    field12: ''
+    field13: ''
+    field14: ''
+    field15: ''
+    field16: ''
+    field17: ''
+    field18: ''
+    field19: ''
+    field2: Released
+    field3: GUIHint
+    field4: CALLBACK
+    field5: Label
+    field6: ''
+    field7: ''
+    field8: ''
+    field9: ''
+    value0: '"QT GUI Toggle Button"'
+    value1: 'True'
+    value10: '0'
+    value11: '0'
+    value12: '0'
+    value13: '0'
+    value14: '0'
+    value15: '0'
+    value16: '0'
+    value17: '0'
+    value18: '0'
+    value19: '0'
+    value2: 'False'
+    value3: '"ranges@0"'
+    value4: '"tb.epy_block_0_0.set"'
+    value5: "\"Listen \u0410\u041C\""
+    value6: '0'
+    value7: '0'
+    value8: '0'
+    value9: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [424, 652.0]
+    rotation: 0
+    state: enabled
+- name: freq
+  id: variable
+  parameters:
+    comment: ''
+    value: freq_slider*1e6+freq_slider_fine*1e6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 284.0]
+    rotation: 0
+    state: enabled
+- name: freq_slider
+  id: variable
+  parameters:
+    comment: ''
+    value: '88'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [328, 348.0]
+    rotation: 0
+    state: enabled
+- name: freq_slider_all
+  id: variable_struct
+  parameters:
+    comment: ''
+    field0: TYPE
+    field1: Label
+    field10: ''
+    field11: ''
+    field12: ''
+    field13: ''
+    field14: ''
+    field15: ''
+    field16: ''
+    field17: ''
+    field18: ''
+    field19: ''
+    field2: DefaultValue
+    field3: Start
+    field4: Stop
+    field5: Step
+    field6: GUIHint
+    field7: CALLBACK
+    field8: ''
+    field9: ''
+    value0: '"QT GUI Range"'
+    value1: '"MHZ"'
+    value10: '0'
+    value11: '0'
+    value12: '0'
+    value13: '0'
+    value14: '0'
+    value15: '0'
+    value16: '0'
+    value17: '0'
+    value18: '0'
+    value19: '0'
+    value2: '24'
+    value3: '24'
+    value4: '1766'
+    value5: '1'
+    value6: '"ranges@0"'
+    value7: '"tb.set_freq_slider"'
+    value8: '0'
+    value9: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [424, 348.0]
+    rotation: 0
+    state: enabled
+- name: freq_slider_fine
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ranges@0
+    label: khz
+    min_len: '200'
+    orient: QtCore.Qt.Horizontal
+    rangeType: float
+    start: '-0.9'
+    step: '0.01'
+    stop: '0.9'
+    value: '0'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [424, 524.0]
+    rotation: 0
+    state: enabled
+- name: freq_slider_fm
+  id: variable_struct
+  parameters:
+    comment: ''
+    field0: TYPE
+    field1: Label
+    field10: ''
+    field11: ''
+    field12: ''
+    field13: ''
+    field14: ''
+    field15: ''
+    field16: ''
+    field17: ''
+    field18: ''
+    field19: ''
+    field2: DefaultValue
+    field3: Start
+    field4: Stop
+    field5: Step
+    field6: GUIHint
+    field7: CALLBACK
+    field8: ''
+    field9: ''
+    value0: '"QT GUI Range"'
+    value1: '"MHZ"'
+    value10: '0'
+    value11: '0'
+    value12: '0'
+    value13: '0'
+    value14: '0'
+    value15: '0'
+    value16: '0'
+    value17: '0'
+    value18: '0'
+    value19: '0'
+    value2: '88'
+    value3: '87.5'
+    value4: '108'
+    value5: '0.1'
+    value6: '"ranges@1"'
+    value7: '"tb.set_freq_slider"'
+    value8: '0'
+    value9: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [744, 348.0]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: 2.4*1e6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 220.0]
+    rotation: 0
+    state: enabled
+- name: variable_qtgui_label_0
+  id: variable_qtgui_label
+  parameters:
+    comment: ''
+    formatter: None
+    gui_hint: ''
+    label: Center Frequency
+    type: real
+    value: freq
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [424, 92.0]
+    rotation: 0
+    state: enabled
+- name: analog_am_demod_cf_0
+  id: analog_am_demod_cf
+  parameters:
+    affinity: ''
+    alias: ''
+    audio_decim: '1'
+    audio_pass: '5000'
+    audio_stop: '5500'
+    chan_rate: 0.048*1e6
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1672, 340.0]
+    rotation: 0
+    state: enabled
+- name: analog_fm_demod_cf_0
+  id: analog_fm_demod_cf
+  parameters:
+    affinity: ''
+    alias: ''
+    audio_decim: '10'
+    audio_pass: '15000'
+    audio_stop: '16000'
+    chan_rate: samp_rate/5
+    comment: ''
+    deviation: '75000'
+    gain: '1.0'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    tau: 75e-6
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1664, 100.0]
+    rotation: 0
+    state: enabled
+- name: analog_wfm_rcv_0
+  id: analog_wfm_rcv
+  parameters:
+    affinity: ''
+    alias: ''
+    audio_decimation: '10'
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    quad_rate: samp_rate/5
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1656, 12.0]
+    rotation: 0
+    state: disabled
+- name: audio_sink_0
+  id: audio_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    device_name: ''
+    num_inputs: '1'
+    ok_to_block: 'True'
+    samp_rate: '48000'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1968, 152.0]
+    rotation: 0
+    state: enabled
+- name: audio_sink_1
+  id: audio_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    device_name: ''
+    num_inputs: '1'
+    ok_to_block: 'True'
+    samp_rate: '48000'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1968, 372.0]
+    rotation: 0
+    state: enabled
+- name: blocks_multiply_const_vxx_0
+  id: blocks_multiply_const_vxx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    const: '20'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1592, 524.0]
+    rotation: 0
+    state: enabled
+- name: epy_block_0
+  id: epy_block
+  parameters:
+    _source_code: "import numpy as np\nfrom gnuradio import gr\n\nclass FMDemodulateGuard(gr.sync_block):\n\
+      \tdef __init__(self):\n\t\t\"\"\"arguments to this function show up as parameters\
+      \ in GRC\"\"\"\n\t\tgr.sync_block.__init__(\n\t\t\tself,\n\t\t\tname='FM Demodulate\
+      \ guard',   # will show up in GRC\n\t\t\tin_sig=[np.complex64],\n\t\t\tout_sig=[np.complex64]\n\
+      \t\t)\n\t\tself.passthrough = False\n\n\tdef set(self, value):\n\t\tself.passthrough\
+      \ = value\n\t\tprint(self.passthrough)\n\n\tdef work(self, input_items, output_items):\n\
+      \t\tif self.passthrough:\n\t\t\toutput_items[0][:] = input_items[0]\n\t\telse:\n\
+      \t\t\toutput_items[0][:] = np.array([0+0j])\n\t\treturn len(output_items[0])\n"
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    _io_cache: ('FM Demodulate guard', 'FMDemodulateGuard', [], [('0', 'complex',
+      1)], [('0', 'complex', 1)], 'arguments to this function show up as parameters
+      in GRC', [])
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1096, 152.0]
+    rotation: 0
+    state: enabled
+- name: epy_block_0_0
+  id: epy_block
+  parameters:
+    _source_code: "import numpy as np\nfrom gnuradio import gr\n\nclass \u0410\u041C\
+      DemodulateGuard(gr.sync_block):\n\tdef __init__(self):\n\t\t\"\"\"arguments\
+      \ to this function show up as parameters in GRC\"\"\"\n\t\tgr.sync_block.__init__(\n\
+      \t\t\tself,\n\t\t\tname='\u0410\u041C Demodulate guard',   # will show up in\
+      \ GRC\n\t\t\tin_sig=[np.complex64],\n\t\t\tout_sig=[np.complex64]\n\t\t)\n\t\
+      \tself.passthrough = False\n\n\tdef set(self, value):\n\t\tself.passthrough\
+      \ = value\n\t\tprint(self.passthrough)\n\n\tdef work(self, input_items, output_items):\n\
+      \t\tif self.passthrough:\n\t\t\toutput_items[0][:] = input_items[0]\n\t\telse:\n\
+      \t\t\toutput_items[0][:] = np.array([0+0j])\n\t\treturn len(output_items[0])\n"
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    _io_cache: "('\u0410\u041C Demodulate guard', '\u0410\u041CDemodulateGuard', [],\
+      \ [('0', 'complex', 1)], [('0', 'complex', 1)], 'arguments to this function\
+      \ show up as parameters in GRC', [])"
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1096, 224.0]
+    rotation: 0
+    state: enabled
+- name: low_pass_filter_0
+  id: low_pass_filter
+  parameters:
+    affinity: ''
+    alias: ''
+    beta: '6.76'
+    comment: ''
+    cutoff_freq: 0.05*1e6
+    decim: '5'
+    gain: '1'
+    interp: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fir_filter_ccf
+    width: 0.01*1e6
+    win: window.WIN_HAMMING
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1360, 108.0]
+    rotation: 0
+    state: enabled
+- name: low_pass_filter_0_0
+  id: low_pass_filter
+  parameters:
+    affinity: ''
+    alias: ''
+    beta: '6.76'
+    comment: ''
+    cutoff_freq: 0.006*1e6
+    decim: '50'
+    gain: '1'
+    interp: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fir_filter_ccf
+    width: 0.002*1e6
+    win: window.WIN_HAMMING
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1376, 324.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_freq_sink_x_0
+  id: qtgui_freq_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    average: '1.0'
+    axislabels: 'False'
+    bw: samp_rate/50
+    color1: '"blue"'
+    color10: '"dark blue"'
+    color2: '"red"'
+    color3: '"green"'
+    color4: '"black"'
+    color5: '"cyan"'
+    color6: '"magenta"'
+    color7: '"yellow"'
+    color8: '"dark red"'
+    color9: '"dark green"'
+    comment: ''
+    ctrlpanel: 'False'
+    fc: '0'
+    fftsize: '1024'
+    freqhalf: 'True'
+    grid: 'False'
+    gui_hint: ranges@1
+    label: Relative Gain
+    label1: ''
+    label10: ''''''
+    label2: ''''''
+    label3: ''''''
+    label4: ''''''
+    label5: ''''''
+    label6: ''''''
+    label7: ''''''
+    label8: ''''''
+    label9: ''''''
+    legend: 'False'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    name: '""'
+    nconnections: '1'
+    norm_window: 'False'
+    showports: 'False'
+    tr_chan: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_tag: '""'
+    type: float
+    units: dB
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    wintype: window.WIN_BLACKMAN_hARRIS
+    ymax: '10'
+    ymin: '-140'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1968, 228.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_waterfall_sink_x_0
+  id: qtgui_waterfall_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    axislabels: 'True'
+    bw: samp_rate
+    color1: '0'
+    color10: '0'
+    color2: '0'
+    color3: '0'
+    color4: '0'
+    color5: '0'
+    color6: '0'
+    color7: '0'
+    color8: '0'
+    color9: '0'
+    comment: ''
+    fc: freq
+    fftsize: '1024'
+    freqhalf: 'True'
+    grid: 'True'
+    gui_hint: ''
+    int_max: '10'
+    int_min: '-140'
+    label1: ''
+    label10: ''
+    label2: ''
+    label3: ''
+    label4: ''
+    label5: ''
+    label6: ''
+    label7: ''
+    label8: ''
+    label9: ''
+    legend: 'True'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    name: '""'
+    nconnections: '1'
+    showports: 'False'
+    type: complex
+    update_time: '0.02'
+    wintype: window.WIN_BLACKMAN_hARRIS
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [416, 12.0]
+    rotation: 0
+    state: enabled
+- name: ranges
+  id: qtgui_tab_widget
+  parameters:
+    alias: ''
+    comment: ''
+    gui_hint: ''
+    label0: All
+    label1: FM
+    label10: Tab 10
+    label11: Tab 11
+    label12: Tab 12
+    label13: Tab 13
+    label14: Tab 14
+    label15: Tab 15
+    label16: Tab 16
+    label17: Tab 17
+    label18: Tab 18
+    label19: Tab 19
+    label2: Tab 2
+    label3: Tab 3
+    label4: Tab 4
+    label5: Tab 5
+    label6: Tab 6
+    label7: Tab 7
+    label8: Tab 8
+    label9: Tab 9
+    num_tabs: '2'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [424, 252.0]
+    rotation: 0
+    state: enabled
+- name: snippet_0
+  id: snippet
+  parameters:
+    alias: ''
+    code: "if 'QtCore' not in sys.modules:\n\tfrom PyQt5 import QtCore\n# Libraries\n\
+      def init_lib(lib):\n\tlib.tb = self\n\tlib.Qt = Qt\n\tlib.QtCore = QtCore\n\t\
+      lib.qtgui = qtgui\ninit_lib(userlib)\n# Components (modules which aren't libraries)\n\
+      def init_module(module):\n\tmodule.tb = self\n\tmodule.Qt = Qt\n\tmodule.userlib\
+      \ = userlib\n\tmodule.init()\ninit_module(struct_widgets)"
+    comment: Inits user modules
+    priority: '0'
+    section: main_after_init
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 548.0]
+    rotation: 0
+    state: enabled
+- name: soapy_rtlsdr_source_0
+  id: soapy_rtlsdr_source
+  parameters:
+    affinity: ''
+    agc: 'False'
+    alias: ''
+    bias: 'False'
+    bufflen: '16384'
+    center_freq: freq
+    comment: ''
+    dev_args: ''
+    freq_correction: '0'
+    gain: '20'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fc32
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 156.0]
+    rotation: 0
+    state: enabled
+- name: struct_widgets
+  id: epy_module
+  parameters:
+    alias: ''
+    comment: 'Struct Variables with an attribute "TYPE" will be used for
+
+      the creation of a QT widget by the same name.'
+    source_code: "def init():\n\tfor name,struct in vars(tb).items():\n\t\tif hasattr(struct,\
+      \ 'TYPE'):\n\t\t\tmatch struct.TYPE:\n\t\t\t\tcase 'QT GUI Range':\n\t\t\t\t\
+      \tuserlib.new_widget_cs(\n\t\t\t\t\t\teval(getattr(struct, 'CALLBACK', \"lambda:\
+      \ default_callback(name)\")),\n\t\t\t\t\t\tgetattr(struct, 'Label', name),\n\
+      \t\t\t\t\t\tgetattr(struct, 'DefaultValue', 50),\n\t\t\t\t\t\tgetattr(struct,\
+      \ 'Start', 0),\n\t\t\t\t\t\tgetattr(struct, 'Stop', 100),\n\t\t\t\t\t\tgetattr(struct,\
+      \ 'Step', 1),\n\t\t\t\t\t\tgetattr(struct, 'MinLen', 200),\n\t\t\t\t\t\tgetattr(struct,\
+      \ 'GUIHint', \"\")\n\t\t\t\t\t)\n\t\t\t\tcase 'QT GUI Toggle Button':\n\t\t\t\
+      \t\tuserlib.new_toggle_button(\n\t\t\t\t\t\teval(getattr(struct, 'CALLBACK',\
+      \ f'lambda _: default_callback(\"{name}\")')),\n\t\t\t\t\t\tgetattr(struct,\
+      \ 'Label', name),\n\t\t\t\t\t\tgetattr(struct, 'Pressed', 1),\n\t\t\t\t\t\t\
+      getattr(struct, 'Released', 0),\n\t\t\t\t\t\tgetattr(struct, 'InitiallyPressed',\
+      \ False),\n\t\t\t\t\t\tgetattr(struct, 'GUIHint', \"\")\n\t\t\t\t\t)\n\t\t\t\
+      \tcase _:\n\t\t\t\t\traise ValueError(f'Unknown TYPE \"{struct.TYPE}\"!')\n\n\
+      def default_callback(name):\n\tprint(f'Callback for \"{name}\" was issued!')\n"
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 708.0]
+    rotation: 0
+    state: enabled
+- name: userlib
+  id: epy_module
+  parameters:
+    alias: ''
+    comment: Defines useful functions
+    source_code: "def new_button(id, callback):\n\t_btn = Qt.QPushButton(id)\n\t_btn.released.connect(callback)\n\
+      \ttb.top_layout.addWidget(_btn)\n\ndef new_widget_cs(callback, label, default,\
+      \ start, stop, step, min_len, hint):\n\t_range = qtgui.Range(start, stop, step,\
+      \ default, min_len)\n\t_slider_win = qtgui.RangeWidget(_range, callback, label,\
+      \ \"counter_slider\", float, QtCore.Qt.Horizontal)\n\tadd_widget_from_hint(_slider_win,\
+      \ hint)\n\ndef new_toggle_button(callback, label, pressed, released, initially_pressed,\
+      \ hint):\n\t\t_button = qtgui.ToggleButton(\n\t\t\tcallback, \n\t\t\tlabel,\n\
+      \t\t\t{'Pressed': pressed, 'Released': released},\n\t\t\tinitially_pressed,\n\
+      \t\t\t'value')\n\t\t_button.setColors(\"default\", \"default\", \"default\"\
+      , \"default\")\n\n\t\tadd_widget_from_hint(_button, hint)\n\ndef add_widget_from_hint(widget,\
+      \ hint):\n\tif hint == \"\" or hint == None:\n\t\treturn tb.top_layout.addWidget(widget)\n\
+      \n\ttabs = hint.split('@')\n\tif len(tabs) == 2:\n\t\tgetattr(tb, tabs[0] +\
+      \ '_layout_' + tabs[1], None).addWidget(widget)\n\telse:\n\t\traise ValueError(f'Invalid\
+      \ GUI hint \"{hint}\"!')\n"
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 636.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [analog_am_demod_cf_0, '0', audio_sink_1, '0']
+- [analog_fm_demod_cf_0, '0', audio_sink_0, '0']
+- [analog_fm_demod_cf_0, '0', qtgui_freq_sink_x_0, '0']
+- [analog_wfm_rcv_0, '0', audio_sink_0, '0']
+- [analog_wfm_rcv_0, '0', qtgui_freq_sink_x_0, '0']
+- [blocks_multiply_const_vxx_0, '0', analog_am_demod_cf_0, '0']
+- [epy_block_0, '0', low_pass_filter_0, '0']
+- [epy_block_0_0, '0', low_pass_filter_0_0, '0']
+- [low_pass_filter_0, '0', analog_fm_demod_cf_0, '0']
+- [low_pass_filter_0, '0', analog_wfm_rcv_0, '0']
+- [low_pass_filter_0_0, '0', blocks_multiply_const_vxx_0, '0']
+- [soapy_rtlsdr_source_0, '0', epy_block_0, '0']
+- [soapy_rtlsdr_source_0, '0', epy_block_0_0, '0']
+- [soapy_rtlsdr_source_0, '0', qtgui_waterfall_sink_x_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.12.0