options:
  parameters:
    author: ''
    catch_exceptions: 'True'
    category: '[GRC Hier Blocks]'
    cmake_opt: ''
    comment: ''
    copyright: ''
    description: https://gallicchio.github.io/learnSDR/lesson01.html
    gen_cmake: 'On'
    gen_linking: dynamic
    generate_options: qt_gui
    hier_block_src_path: '.:'
    id: RTL_SDR_FM
    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: Hello World
    window_size: (1000,1000)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [8, 4.0]
    rotation: 0
    state: enabled

blocks:
- name: freq
  id: variable
  parameters:
    comment: ''
    value: freq_range*1e6
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [32, 324.0]
    rotation: 0
    state: enabled
- name: freq_range
  id: variable_qtgui_range
  parameters:
    comment: ''
    gui_hint: ''
    label: ''
    min_len: '200'
    orient: QtCore.Qt.Horizontal
    rangeType: float
    start: '87.5'
    step: '0.1'
    stop: '108'
    value: '88'
    widget: counter_slider
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [328, 388.0]
    rotation: 0
    state: enabled
- name: samp_rate
  id: variable
  parameters:
    comment: ''
    value: 2.4e6
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [32, 252.0]
    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: [576, 276.0]
    rotation: 0
    state: enabled
- 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: [616, 484.0]
    rotation: 0
    state: enabled
- name: low_pass_filter_0
  id: low_pass_filter
  parameters:
    affinity: ''
    alias: ''
    beta: '6.76'
    comment: ''
    cutoff_freq: 0.05e6
    decim: '5'
    gain: '1'
    interp: '1'
    maxoutbuf: '0'
    minoutbuf: '0'
    samp_rate: samp_rate
    type: fir_filter_ccf
    width: 0.025e6
    win: window.WIN_HAMMING
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [296, 148.0]
    rotation: 0
    state: enabled
- name: note_0
  id: note
  parameters:
    alias: ''
    comment: "Decimation \u0441\u0435 \u0432\u043E\u0434\u0438, \u0447\u0435 \"\u043F\
      \u0440\u0435\u043C\u0430\u0445\u0432\u0430 \u0432\u0441\u0435\u043A\u0438 N-\u0442\
      \u0438 sample\" \u043D\u0430 \u0441\u0438\u0433\u043D\u0430\u043B\u0430, \u043E\
      \u0431\u0430\u0447\u0435 \u0438\u043C\u0430 \u043D\u044F\u043A\u043E\u0438 \u0434\
      \u0435\u0442\u0430\u0439\u043B\u0438.\n\u0415\u0444\u0435\u043A\u0442\u0430\
      \ \u043D\u0430 decimation \u0435 \u0440\u0430\u0437\u043B\u0438\u0447\u0435\u043D\
      \ \u043E\u0442 sample rate, \u0437\u0430\u0449\u043E\u0442\u043E \u043F\u0440\
      \u0438 decimation\n\u043D\u0430\u043C\u0430\u043B\u044F\u043C\u0435 \u0432\u0438\
      \u0441\u043E\u043A\u043E\u0447\u0435\u0441\u0442\u043E\u0442\u043D\u0438\u0442\
      \u0435 \u0441\u0438\u0433\u043D\u0430\u043B\u0438 \u0447\u0440\u0435\u0437 \u0441\
      \u0430\u043C\u0438\u044F low pass filter.\n\n\u0421\u043F\u043E\u0440\u0435\u0434\
      \ \u0442\u0435\u043E\u0440\u0435\u043C\u0430\u0442\u0430 \u043D\u0430 Nyquist\u2013\
      Shannon, \u0442\u0440\u044F\u0431\u0432\u0430 \u0434\u0430 sample-\u0432\u0430\
      \u043C\u0435 \u043F\u043E\u043D\u0435 2x \u043D\u0430 \u043D\u0430\u0439-\u0432\
      \u0438\u0441\u043E\u043A\u043E\u0447\u0435\u0441\u0442\u043E\u0442\u043D\u0430\
      \u0442\u0430 \u0432\u044A\u043B\u043D\u0430 (\u043F\u043E-\u043A\u043E\u043D\
      \u043A\u0440\u0435\u0442\u043D\u043E bandwidth).\n\u0412 Low Pass Filter \u0431\
      \u044F\u0445 \u0441\u043B\u043E\u0436\u0438\u043B Decimation=1 \u0438 SampleRate=samp_rate/5,\
      \ \u043A\u043E\u0435\u0442\u043E \u0435 \u0440\u0430\u0437\u043B\u0438\u0447\
      \u043D\u043E \u043E\u0442 Decimation=5 \u0438 SampleRate=samp_rate.\n\n\u041F\
      \u0440\u0438 \u043F\u044A\u0440\u0432\u043E\u0442\u043E, \u0443\u0434\u0440\u044F\
      \u043C \u043D\u0430 \u0442\u0435\u043E\u0440\u0435\u043C\u0430\u0442\u0430,\
      \ \u0437\u0430\u0449\u043E\u0442\u043E \u043F\u0440\u0430\u0432\u044F sampling\
      \ \u043D\u0430 480k, \u0434\u043E\u043A\u0430\u0442\u043E bandwidth \u043C\u0438\
      \ \u0435 1.4M (2.4M / 2 ; RTLSDR sample rate = 2 * bandwidth).\n\u041F\u0440\
      \u0438 \u0432\u0442\u043E\u0440\u043E\u0442\u043E, \u043F\u044A\u0440\u0432\u043E\
      \ \u0441\u0438\u0433\u043D\u0430\u043B\u0430 (\u043D\u0430 \u043F\u044A\u043B\
      \u0435\u043D sample rate) \u043C\u0438\u043D\u0430\u0432\u0430 \u043F\u0440\u0435\
      \u0437 \u0444\u0438\u043B\u0442\u044A\u0440\u0430 (\u0442.\u0435. \u0432\u0441\
      \u0438\u0447\u043A\u043E \u043D\u0430\u0434 50k \u0441\u0435 \u043D\u0430\u043C\
      \u0430\u043B\u044F \u0434\u043E 0) \u0438 \u0441\u043B\u0435\u0434 \u0442\u043E\
      \u0432\u0430 \u0441\u0435 \u043D\u0430\u043C\u0430\u043B\u044F sample rate-\u0430\
      \ \u043D\u0430 480k"
    note: Decimation vs sample rate
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [8, 468.0]
    rotation: 0
    state: enabled
- name: note_1
  id: note
  parameters:
    alias: ''
    comment: "RTLSDR sample rate = 2 * band width\n\u0421\u0438\u0433\u043D\u0430\u043B\
      \u0438\u0442\u0435 \u043E\u0442 \u0446\u0435\u043D\u0442\u0440\u0430\u043B\u043D\
      \u0430\u0442\u0430 \u0447\u0435\u0441\u0442\u043E\u0442\u0430 \u0441\u0435 \u0438\
      \u0437\u0432\u0430\u0436\u0434\u0430\u0442 (\u0446\u0435\u043D\u0442\u0440\u0438\
      \u0440\u0430\u0442),\n\u0442\u0430\u043A\u0430 \u0447\u0435 \u0446\u0435\u043D\
      \u0442\u0440\u0430\u043B\u043D\u0430\u0442\u0430 \u0447\u0435\u0441\u0442\u043E\
      \u0442\u0430 \u0434\u0430 \u0435 0.\n\u0417\u0430\u0442\u043E\u0432\u0430 \u043D\
      \u0435 \u0441\u0442\u0438\u0433\u0430\u043C\u0435 \u0434\u043E \u043F\u0440\u043E\
      \u0431\u043B\u0435\u043C\u0438 (\u0441 Nyquist\u2013Shannon) \u0432\u044A\u043F\
      \u0440\u0435\u043A\u0438, \u0447\u0435\n\u0432\u0437\u0435\u043C\u0430\u043C\
      \u0435 \u0441\u0438\u0433\u043D\u0430\u043B\u0438 \u043E\u0442 (\u043F\u0440\
      \u0438\u043C\u0435\u0440\u043D\u043E) 88M \u0441\u044A\u0441 sample rate \u043E\
      \u0442 2.4M."
    note: RTLSDR bandwidth
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [176, 4.0]
    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: 'True'
    bw: samp_rate
    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: freq
    fftsize: '1024'
    freqhalf: 'True'
    grid: 'False'
    gui_hint: ''
    label: Relative Gain
    label1: ''
    label10: ''''''
    label2: ''''''
    label3: ''''''
    label4: ''''''
    label5: ''''''
    label6: ''''''
    label7: ''''''
    label8: ''''''
    label9: ''''''
    legend: 'True'
    maxoutbuf: '0'
    minoutbuf: '0'
    name: Entire band
    nconnections: '1'
    norm_window: 'False'
    showports: 'False'
    tr_chan: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_tag: '""'
    type: complex
    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: [296, 284.0]
    rotation: 0
    state: enabled
- name: qtgui_freq_sink_x_1
  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: 'True'
    bw: samp_rate/5
    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: ''
    label: Relative Gain
    label1: ''
    label10: ''''''
    label2: ''''''
    label3: ''''''
    label4: ''''''
    label5: ''''''
    label6: ''''''
    label7: ''''''
    label8: ''''''
    label9: ''''''
    legend: 'True'
    maxoutbuf: '0'
    minoutbuf: '0'
    name: After low pass filter
    nconnections: '1'
    norm_window: 'False'
    showports: 'False'
    tr_chan: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_tag: '""'
    type: complex
    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: [576, 76.0]
    rotation: 0
    state: enabled
- name: qtgui_freq_sink_x_2
  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: 'True'
    bw: samp_rate/5/10
    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: ''
    label: Relative Gain
    label1: Audio
    label10: ''''''
    label2: ''''''
    label3: ''''''
    label4: ''''''
    label5: ''''''
    label6: ''''''
    label7: ''''''
    label8: ''''''
    label9: ''''''
    legend: 'True'
    maxoutbuf: '0'
    minoutbuf: '0'
    name: Audio
    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: [608, 388.0]
    rotation: 0
    state: enabled
- name: qtgui_time_sink_x_0
  id: qtgui_time_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'
    axislabels: 'True'
    color1: blue
    color10: dark blue
    color2: red
    color3: green
    color4: black
    color5: cyan
    color6: magenta
    color7: yellow
    color8: dark red
    color9: dark green
    comment: "\u0412\u0445\u043E\u0434\u043D\u0438\u0442\u0435 \u0434\u0430\u043D\u043D\
      \u0438 \u0441\u0430 \u043A\u043E\u043C\u043F\u043B\u0435\u043A\u0441\u043D\u0438\
      \ \u0447\u0438\u0441\u043B\u0430"
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Real
    label10: Signal 10
    label2: Imag
    label3: Signal 3
    label4: Signal 4
    label5: Signal 5
    label6: Signal 6
    label7: Signal 7
    label8: Signal 8
    label9: Signal 9
    legend: 'True'
    marker1: '-1'
    marker10: '-1'
    marker2: '-1'
    marker3: '-1'
    marker4: '-1'
    marker5: '-1'
    marker6: '-1'
    marker7: '-1'
    marker8: '-1'
    marker9: '-1'
    name: '""'
    nconnections: '1'
    size: '1024'
    srate: samp_rate/5
    stemplot: 'False'
    style1: '1'
    style10: '1'
    style2: '1'
    style3: '1'
    style4: '1'
    style5: '1'
    style6: '1'
    style7: '1'
    style8: '1'
    style9: '1'
    tr_chan: '0'
    tr_delay: '0'
    tr_level: '0.0'
    tr_mode: qtgui.TRIG_MODE_FREE
    tr_slope: qtgui.TRIG_SLOPE_POS
    tr_tag: '""'
    type: complex
    update_time: '0.10'
    width1: '1'
    width10: '1'
    width2: '1'
    width3: '1'
    width4: '1'
    width5: '1'
    width6: '1'
    width7: '1'
    width8: '1'
    width9: '1'
    ylabel: Amplitude
    ymax: '1'
    ymin: '-1'
    yunit: '""'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [576, 172.0]
    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, 180.0]
    rotation: 0
    state: enabled

connections:
- [analog_wfm_rcv_0, '0', audio_sink_0, '0']
- [analog_wfm_rcv_0, '0', qtgui_freq_sink_x_2, '0']
- [low_pass_filter_0, '0', analog_wfm_rcv_0, '0']
- [low_pass_filter_0, '0', qtgui_freq_sink_x_1, '0']
- [low_pass_filter_0, '0', qtgui_time_sink_x_0, '0']
- [soapy_rtlsdr_source_0, '0', low_pass_filter_0, '0']
- [soapy_rtlsdr_source_0, '0', qtgui_freq_sink_x_0, '0']

metadata:
  file_format: 1
  grc_version: 3.10.12.0