options:
  parameters:
    author: Barry Duggan
    category: '[GRC Hier Blocks]'
    cmake_opt: ''
    comment: ''
    copyright: ''
    description: NB FM receiver
    gen_cmake: 'On'
    gen_linking: dynamic
    generate_options: qt_gui
    hier_block_src_path: '.:'
    id: NFM_rcv
    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: NFM_rcv
    window_size: ''
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [24, 12.0]
    rotation: 0
    state: enabled

blocks:
- name: channel_filter
  id: variable_band_pass_filter_taps
  parameters:
    beta: '6.76'
    comment: ''
    gain: '1.0'
    high_cutoff_freq: '3000'
    low_cutoff_freq: '-3000'
    samp_rate: samp_rate
    type: complex_band_pass
    width: '200'
    win: firdes.WIN_HAMMING
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [368, 12.0]
    rotation: 0
    state: true
- name: rf_decim
  id: variable
  parameters:
    comment: ''
    value: '3'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [288, 12.0]
    rotation: 0
    state: true
- name: samp_rate
  id: variable
  parameters:
    comment: ''
    value: '576000'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [200, 12.0]
    rotation: 0
    state: enabled
- name: sq_lvl
  id: variable_qtgui_range
  parameters:
    comment: ''
    gui_hint: ''
    label: Squelch
    min_len: '200'
    orient: Qt.Horizontal
    rangeType: float
    start: '-100'
    step: '5'
    stop: '0'
    value: '-50'
    widget: counter_slider
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [536, 12.0]
    rotation: 0
    state: enabled
- name: volume
  id: variable_qtgui_range
  parameters:
    comment: ''
    gui_hint: ''
    label: Volume
    min_len: '200'
    orient: Qt.Horizontal
    rangeType: float
    start: '0'
    step: '0.05'
    stop: '1.00'
    value: '0.05'
    widget: slider
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [656, 12.0]
    rotation: 0
    state: enabled
- name: analog_nbfm_rx_0
  id: analog_nbfm_rx
  parameters:
    affinity: ''
    alias: ''
    audio_rate: '48000'
    comment: ''
    max_dev: 5e3
    maxoutbuf: '0'
    minoutbuf: '0'
    quad_rate: (int)(samp_rate/rf_decim)
    tau: 75e-6
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [600, 196.0]
    rotation: 0
    state: enabled
- name: analog_simple_squelch_cc_0
  id: analog_simple_squelch_cc
  parameters:
    affinity: ''
    alias: ''
    alpha: '1'
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    threshold: sq_lvl
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [424, 212.0]
    rotation: 0
    state: enabled
- name: audio_sink_0
  id: audio_sink
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    device_name: ''
    num_inputs: '1'
    ok_to_block: 'False'
    samp_rate: '48000'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [744, 324.0]
    rotation: 0
    state: enabled
- name: blocks_multiply_const_vxx_0_0
  id: blocks_multiply_const_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: Volume
    const: volume
    maxoutbuf: '0'
    minoutbuf: '0'
    type: float
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [576, 324.0]
    rotation: 0
    state: enabled
- name: fft_filter_xxx_0_0
  id: fft_filter_xxx
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    decim: rf_decim
    maxoutbuf: '0'
    minoutbuf: '0'
    nthreads: '1'
    samp_delay: '0'
    taps: channel_filter
    type: ccc
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [256, 204.0]
    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: '0'
    fftsize: '1024'
    freqhalf: 'True'
    grid: 'False'
    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: '0.10'
    wintype: firdes.WIN_BLACKMAN_hARRIS
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [264, 296.0]
    rotation: 0
    state: true
- name: zeromq_sub_source_0
  id: zeromq_sub_source
  parameters:
    address: tcp://127.0.0.1:49201
    affinity: ''
    alias: ''
    comment: USRP sample rate = 576kHz
    hwm: '-1'
    maxoutbuf: '0'
    minoutbuf: '0'
    pass_tags: 'False'
    timeout: '100'
    type: complex
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [24, 204.0]
    rotation: 0
    state: true

connections:
- [analog_nbfm_rx_0, '0', blocks_multiply_const_vxx_0_0, '0']
- [analog_simple_squelch_cc_0, '0', analog_nbfm_rx_0, '0']
- [blocks_multiply_const_vxx_0_0, '0', audio_sink_0, '0']
- [fft_filter_xxx_0_0, '0', analog_simple_squelch_cc_0, '0']
- [zeromq_sub_source_0, '0', fft_filter_xxx_0_0, '0']
- [zeromq_sub_source_0, '0', qtgui_waterfall_sink_x_0, '0']

metadata:
  file_format: 1