options:
  parameters:
    author: Barry Duggan
    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: RTTY_receive
    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: RTTY_receive
    window_size: (1000,1000)
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [16, 12.0]
    rotation: 0
    state: enabled

blocks:
- name: baud
  id: variable
  parameters:
    comment: ''
    value: 1/0.022
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [280, 12.0]
    rotation: 0
    state: enabled
- name: center
  id: variable
  parameters:
    comment: ''
    value: '2210'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [376, 12.0]
    rotation: 0
    state: enabled
- name: decim
  id: variable
  parameters:
    comment: ''
    value: '50'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [184, 76.0]
    rotation: 0
    state: true
- name: fsk_deviation
  id: variable
  parameters:
    comment: ''
    value: '170'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [584, 12.0]
    rotation: 0
    state: enabled
- name: reverse
  id: variable_qtgui_chooser
  parameters:
    comment: ''
    gui_hint: ''
    label: ''
    label0: Normal
    label1: Reverse
    label2: ''
    label3: ''
    label4: ''
    labels: '[]'
    num_opts: '2'
    option0: '1'
    option1: '-1'
    option2: '2'
    option3: '3'
    option4: '4'
    options: '[0, 1, 2]'
    orient: Qt.QVBoxLayout
    type: int
    value: '1'
    widget: radio_buttons
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1008, 12.0]
    rotation: 0
    state: enabled
- name: samp_rate
  id: variable
  parameters:
    comment: ''
    value: '48000'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [184, 12.0]
    rotation: 0
    state: enabled
- name: sps
  id: variable
  parameters:
    comment: ''
    value: '11'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [688, 12.0]
    rotation: 0
    state: true
- name: sq_lvl
  id: variable_qtgui_range
  parameters:
    comment: ''
    gui_hint: ''
    label: Squelch
    min_len: '200'
    orient: QtCore.Qt.Horizontal
    rangeType: float
    start: '-100'
    step: '5'
    stop: '0'
    value: '-70'
    widget: counter_slider
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [464, 12.0]
    rotation: 0
    state: enabled
- name: analog_quadrature_demod_cf_0
  id: analog_quadrature_demod_cf
  parameters:
    affinity: ''
    alias: ''
    comment: sample rate 960 Hz
    gain: samp_rate/(2*math.pi*fsk_deviation*decim)
    maxoutbuf: '0'
    minoutbuf: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [632, 220.0]
    rotation: 0
    state: true
- 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: [448, 212.0]
    rotation: 0
    state: enabled
- name: audio_source_0
  id: audio_source
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    device_name: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    num_outputs: '1'
    ok_to_block: 'True'
    samp_rate: samp_rate
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [16, 204.0]
    rotation: 0
    state: enabled
- name: blocks_char_to_float_0
  id: blocks_char_to_float
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
    scale: '1'
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [392, 436.0]
    rotation: 0
    state: enabled
- name: blocks_multiply_const_vxx_0
  id: blocks_multiply_const_vxx
  parameters:
    affinity: ''
    alias: ''
    comment: Normal/Reverse
    const: reverse
    maxoutbuf: '0'
    minoutbuf: '0'
    type: float
    vlen: '1'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1016, 220.0]
    rotation: 0
    state: enabled
- name: digital_binary_slicer_fb_0
  id: digital_binary_slicer_fb
  parameters:
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [272, 488.0]
    rotation: 0
    state: enabled
- name: epy_block_0
  id: epy_block
  parameters:
    _source_code: "\"\"\"\nTerminal Display Sink\n\"\"\"\n\n#  epy_block_0.py\n# \
      \ revised 07/07/2019\n\nimport numpy as np\nfrom gnuradio import gr\nimport\
      \ pmt\n\nITA2 = [ '\\x00', 'E', '\\n', 'A', ' ', 'S', 'I', 'U', '\\r', 'D',\
      \ 'R', 'J', 'N', 'F', 'C', 'K',\n            'T', 'Z', 'L', 'W', 'H', 'Y', 'P',\
      \ 'Q', 'O', 'B', 'G', '\\x0e', 'M', 'X', 'V', '\\x0f',\n            '\\x00',\
      \ '3', '\\n', '-', ' ', '\\x07', '8', '7', '\\r', '$', '4', '\\'', ',', '!',\
      \ ':', '(',\n            '5', '\\\"', ')', '2', '#', '6', '0', '1', '9', '?',\
      \ '&', '\\x0e', '.', '/', ';', '\\x0f' ]\n\n\n_samples = [ 11, 22, 33, 44, 55,\
      \ 66, 77 ]\n_in_sync = 0\n_bit_count = 0\t# actually sample count from beginning\
      \ of start bit\n_num_ones = 0\n_num_zeros = 0\n_byte = 0\t# this is the index\
      \ into ITA2\n_in_bit = 0\n_shift = 0\noutLine = []\noutCount = 0\n\nclass my_sync_block(gr.sync_block):\n\
      \    \"\"\"\n\treads stream of 1's and 0's\n\tthere are 11 samples for each\
      \ bit time\n\tsynchronizes on start bit\n\tuses majority of samples in a bit\
      \ to determine validity\n\tcreates Baudot character\n\tconverts Baudot to UTF-8\n\
      \tdisplays characters on terminal screen\n    \"\"\"\n    def __init__(self):\n\
      \        gr.sync_block.__init__(self,\n            name = \"Terminal Display\
      \ Sink\",\n            in_sig = [np.byte],\n            out_sig = None)\n  \
      \      self.message_port_register_out(pmt.intern('msg_out'))\n\n    def work(self,\
      \ input_items, output_items):\n        global _samples\n        global _in_sync\n\
      \        global _bit_count\n        global _num_ones\n        global _num_zeros\n\
      \        global _byte\n        global _in_bit\n        global _shift\n     \
      \   global outLine\n        global outCount\n\n        for ch in input_items[0]:\n\
      \            if (ch == 1):\n                _num_ones += 1       # count ones\
      \ in this symbol time\n            else:\n                _num_zeros += 1  \
      \    # count zeros in this symbol time\n            _bit_count += 1        \
      \  # count from first start bit after syncing\n            if (_in_sync == 0):\n\
      \                if (ch == 0):\n                    _in_sync = 1\n         \
      \           _bit_count = 1\n                    _num_ones = 0\n            \
      \        _num_zeros = 1\n                    _byte = 0\n                   \
      \ # print (\"sync\")\n\n            if (_bit_count in _samples) and (_in_sync\
      \ == 1):    # end of this symbol time\n                if (_num_ones > 7):\n\
      \                    _in_bit = 1\n                elif (_num_zeros > 7):\n \
      \                   _in_bit = 0\n                else:\n                   \
      \ _in_bit = -1\n                    _in_sync = 0    # lots of noise\n      \
      \          # print (\"_in_sync\", _in_sync)\n                # print (\"_bit_count\"\
      , _bit_count)\n                # print (\"_num_ones\", _num_ones)\n        \
      \        # print (\"_num_zeros\", _num_zeros)\n                _num_ones = 0\n\
      \                _num_zeros = 0\n\n                if (_in_sync == 1) and (_bit_count\
      \ < 77):\n                    _byte >>= 1\n                    if (_in_bit ==\
      \ 1):\n                        _byte += 16\n                    # print (_byte)\n\
      \n                if (_in_sync == 1) and (_bit_count == 77):\n             \
      \       if (_byte > 0) and (_byte < 64):\n                        _byte += _shift\n\
      \                        if ((_byte == 0x1b) or (_byte == 0x3b)):        # shift\
      \ out (figs)\n                            _shift = 0x20\n                  \
      \      elif ((_byte == 0x1f) or (_byte == 0x3f)):        # shift in (ltrs)\n\
      \                            _shift = 0\n                        else:\n   \
      \                         if ((_byte != 2) and (_byte != 34)):\n           \
      \                     outLine.append (ITA2[_byte])\n                    else:\n\
      \                        outLine.append ('*')\n                    _num_ones\
      \ = 0\n                    _num_zeros = 0\n                    _in_sync = 0\n\
      \                    _bit_count = 0\n                    outCount += 1\n   \
      \                 if ((outCount > 80) and (ITA2[_byte] == ' ')) or (_byte ==\
      \ 2) or (_byte == 34):  # LF\n                        dispLine = \"\".join (outLine)\n\
      \                        self.message_port_pub (pmt.intern('msg_out'), pmt.intern\
      \ (dispLine))\n                        outLine = []\n                      \
      \  outCount = 0\n\n        return len(input_items[0])\n\n"
    affinity: ''
    alias: ''
    comment: ''
    maxoutbuf: '0'
    minoutbuf: '0'
  states:
    _io_cache: ('Terminal Display Sink', 'my_sync_block', [], [('0', 'byte', 1)],
      [('msg_out', 'message', 1)], "\n\treads stream of 1's and 0's\n\tthere are 11
      samples for each bit time\n\tsynchronizes on start bit\n\tuses majority of samples
      in a bit to determine validity\n\tcreates Baudot character\n\tconverts Baudot
      to UTF-8\n\tdisplays characters on terminal screen\n    ", [])
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [448, 488.0]
    rotation: 0
    state: enabled
- name: freq_xlating_fir_filter_xxx_0
  id: freq_xlating_fir_filter_xxx
  parameters:
    affinity: ''
    alias: ''
    center_freq: center
    comment: ''
    decim: '50'
    maxoutbuf: '0'
    minoutbuf: '0'
    samp_rate: samp_rate
    taps: firdes.low_pass(1.0,samp_rate,1000,400)
    type: fcf
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [200, 196.0]
    rotation: 0
    state: enabled
- name: note_0
  id: note
  parameters:
    alias: ''
    comment: ''
    note: revised 04 Apr 2024
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [16, 108.0]
    rotation: 0
    state: enabled
- name: qtgui_eye_sink_x_0
  id: qtgui_eye_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: blue
    color2: blue
    color3: blue
    color4: blue
    color5: blue
    color6: blue
    color7: blue
    color8: blue
    color9: blue
    comment: ''
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Signal 1
    label10: Signal 10
    label2: Signal 2
    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'
    nconnections: '1'
    samp_per_symbol: sps
    size: '1024'
    srate: '500'
    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: float
    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: [1040, 308.0]
    rotation: 0
    state: true
- 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: ''
    ctrlpanel: 'False'
    entags: 'True'
    grid: 'False'
    gui_hint: ''
    label1: Signal 1
    label10: Signal 10
    label2: Signal 2
    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: '2'
    size: '512'
    srate: '500'
    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_NORM
    tr_slope: qtgui.TRIG_SLOPE_NEG
    tr_tag: '""'
    type: float
    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: '1.0'
    ymin: '-1.0'
    yunit: '""'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [488, 348.0]
    rotation: 0
    state: enabled
- name: rational_resampler_xxx_0_0
  id: rational_resampler_xxx
  parameters:
    affinity: ''
    alias: ''
    comment: 'sample rate = 500 yields

      11 samples per symbol'
    decim: '960'
    fbw: '0'
    interp: '500'
    maxoutbuf: '0'
    minoutbuf: '0'
    taps: ''
    type: fff
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [824, 196.0]
    rotation: 0
    state: enabled
- name: virtual_sink_0
  id: virtual_sink
  parameters:
    alias: ''
    comment: ''
    stream_id: '"rcv_demod"'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [1184, 220.0]
    rotation: 0
    state: true
- name: virtual_source_0
  id: virtual_source
  parameters:
    alias: ''
    comment: ''
    stream_id: '"rcv_demod"'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [48, 484.0]
    rotation: 0
    state: true
- name: zeromq_push_msg_sink_0
  id: zeromq_push_msg_sink
  parameters:
    address: tcp://127.0.0.1:50252
    affinity: ''
    alias: ''
    bind: 'True'
    comment: ''
    timeout: '100'
  states:
    bus_sink: false
    bus_source: false
    bus_structure: null
    coordinate: [696, 476.0]
    rotation: 0
    state: true

connections:
- [analog_quadrature_demod_cf_0, '0', rational_resampler_xxx_0_0, '0']
- [analog_simple_squelch_cc_0, '0', analog_quadrature_demod_cf_0, '0']
- [audio_source_0, '0', freq_xlating_fir_filter_xxx_0, '0']
- [blocks_char_to_float_0, '0', qtgui_time_sink_x_0, '1']
- [blocks_multiply_const_vxx_0, '0', virtual_sink_0, '0']
- [digital_binary_slicer_fb_0, '0', blocks_char_to_float_0, '0']
- [digital_binary_slicer_fb_0, '0', epy_block_0, '0']
- [epy_block_0, msg_out, zeromq_push_msg_sink_0, in]
- [freq_xlating_fir_filter_xxx_0, '0', analog_simple_squelch_cc_0, '0']
- [rational_resampler_xxx_0_0, '0', blocks_multiply_const_vxx_0, '0']
- [rational_resampler_xxx_0_0, '0', qtgui_eye_sink_x_0, '0']
- [virtual_source_0, '0', digital_binary_slicer_fb_0, '0']
- [virtual_source_0, '0', qtgui_time_sink_x_0, '0']

metadata:
  file_format: 1
  grc_version: v3.11.0.0git-652-g5547874b