diff --git a/examples/receiverRTLSDR.grc b/examples/receiverRTLSDR.grc
index 41b261e..1fbbe7a 100644
--- a/examples/receiverRTLSDR.grc
+++ b/examples/receiverRTLSDR.grc
@@ -1,6 +1,6 @@
 options:
   parameters:
-    author: ''
+    author: Wojciech Kaczmarski, SP5WWP
     catch_exceptions: 'True'
     category: '[GRC Hier Blocks]'
     cmake_opt: ''
@@ -22,7 +22,7 @@ options:
     run_options: prompt
     sizing_mode: fixed
     thread_safe_setters: ''
-    title: Not titled yet
+    title: Simple M17 receiver for RTL-SDR
     window_size: (1000,1000)
   states:
     bus_sink: false
@@ -33,420 +33,218 @@ options:
     state: enabled
 
 blocks:
+- name: ppm
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: ppm
+    min_len: '200'
+    orient: QtCore.Qt.Horizontal
+    rangeType: float
+    start: '-10'
+    step: '0.1'
+    stop: '10'
+    value: '0'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [304, 12.0]
+    rotation: 0
+    state: true
+- name: rf_gain
+  id: variable_qtgui_range
+  parameters:
+    comment: ''
+    gui_hint: ''
+    label: RF gain
+    min_len: '200'
+    orient: QtCore.Qt.Horizontal
+    rangeType: float
+    start: '0'
+    step: '1'
+    stop: '49'
+    value: '10'
+    widget: counter_slider
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [416, 12.0]
+    rotation: 0
+    state: true
 - name: samp_rate
   id: variable
   parameters:
     comment: ''
-    value: 4800*240
+    value: '48000'
   states:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [184, 12]
+    coordinate: [192, 12.0]
     rotation: 0
     state: enabled
-- name: analog_nbfm_rx_0
-  id: analog_nbfm_rx
+- name: analog_quadrature_demod_cf_0
+  id: analog_quadrature_demod_cf
   parameters:
     affinity: ''
     alias: ''
-    audio_rate: int(samp_rate/10)
     comment: ''
-    max_dev: 5e3
+    gain: samp_rate/(2.0*math.pi*800.0)
     maxoutbuf: '0'
     minoutbuf: '0'
-    quad_rate: samp_rate
-    tau: 75e-6
   states:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [296, 160.0]
+    coordinate: [400, 324.0]
     rotation: 0
-    state: true
-- name: blocks_null_sink_0
-  id: blocks_null_sink
+    state: enabled
+- name: audio_sink_0
+  id: audio_sink
   parameters:
     affinity: ''
     alias: ''
-    bus_structure_sink: '[[0,],]'
     comment: ''
+    device_name: ''
     num_inputs: '1'
+    ok_to_block: 'True'
+    samp_rate: samp_rate
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [2240, 292.0]
+    rotation: 0
+    state: enabled
+- name: blocks_moving_average_xx_0
+  id: blocks_moving_average_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    length: int(0.1*samp_rate)
+    max_iter: '4000'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    scale: 1/int(0.1*samp_rate)
+    type: float
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [504, 420.0]
+    rotation: 0
+    state: true
+- name: blocks_packed_to_unpacked_xx_0
+  id: blocks_packed_to_unpacked_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    bits_per_chunk: '1'
+    comment: ''
+    endianness: gr.GR_MSB_FIRST
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_ports: '1'
+    type: byte
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1416, 284.0]
+    rotation: 0
+    state: enabled
+- name: blocks_short_to_float_0
+  id: blocks_short_to_float
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    scale: '32768.0'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1936, 292.0]
+    rotation: 0
+    state: enabled
+- name: blocks_stream_to_vector_0
+  id: blocks_stream_to_vector
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_items: '64'
     type: byte
     vlen: '1'
   states:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [680, 264.0]
+    coordinate: [1592, 296.0]
     rotation: 0
-    state: true
-- name: m17_m17_decoder_0
-  id: m17_m17_decoder
+    state: enabled
+- name: blocks_sub_xx_0
+  id: blocks_sub_xx
   parameters:
     affinity: ''
     alias: ''
     comment: ''
-    debug: 'True'
     maxoutbuf: '0'
     minoutbuf: '0'
+    num_inputs: '2'
+    type: float
+    vlen: '1'
   states:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [544, 256.0]
+    coordinate: [656, 328.0]
     rotation: 0
     state: true
-- name: osmosdr_source_0
-  id: osmosdr_source
+- name: digital_symbol_sync_xx_0
+  id: digital_symbol_sync_xx
   parameters:
     affinity: ''
     alias: ''
-    ant0: ''
-    ant1: ''
-    ant10: ''
-    ant11: ''
-    ant12: ''
-    ant13: ''
-    ant14: ''
-    ant15: ''
-    ant16: ''
-    ant17: ''
-    ant18: ''
-    ant19: ''
-    ant2: ''
-    ant20: ''
-    ant21: ''
-    ant22: ''
-    ant23: ''
-    ant24: ''
-    ant25: ''
-    ant26: ''
-    ant27: ''
-    ant28: ''
-    ant29: ''
-    ant3: ''
-    ant30: ''
-    ant31: ''
-    ant4: ''
-    ant5: ''
-    ant6: ''
-    ant7: ''
-    ant8: ''
-    ant9: ''
-    args: '""'
-    bb_gain0: '20'
-    bb_gain1: '20'
-    bb_gain10: '20'
-    bb_gain11: '20'
-    bb_gain12: '20'
-    bb_gain13: '20'
-    bb_gain14: '20'
-    bb_gain15: '20'
-    bb_gain16: '20'
-    bb_gain17: '20'
-    bb_gain18: '20'
-    bb_gain19: '20'
-    bb_gain2: '20'
-    bb_gain20: '20'
-    bb_gain21: '20'
-    bb_gain22: '20'
-    bb_gain23: '20'
-    bb_gain24: '20'
-    bb_gain25: '20'
-    bb_gain26: '20'
-    bb_gain27: '20'
-    bb_gain28: '20'
-    bb_gain29: '20'
-    bb_gain3: '20'
-    bb_gain30: '20'
-    bb_gain31: '20'
-    bb_gain4: '20'
-    bb_gain5: '20'
-    bb_gain6: '20'
-    bb_gain7: '20'
-    bb_gain8: '20'
-    bb_gain9: '20'
-    bw0: '0'
-    bw1: '0'
-    bw10: '0'
-    bw11: '0'
-    bw12: '0'
-    bw13: '0'
-    bw14: '0'
-    bw15: '0'
-    bw16: '0'
-    bw17: '0'
-    bw18: '0'
-    bw19: '0'
-    bw2: '0'
-    bw20: '0'
-    bw21: '0'
-    bw22: '0'
-    bw23: '0'
-    bw24: '0'
-    bw25: '0'
-    bw26: '0'
-    bw27: '0'
-    bw28: '0'
-    bw29: '0'
-    bw3: '0'
-    bw30: '0'
-    bw31: '0'
-    bw4: '0'
-    bw5: '0'
-    bw6: '0'
-    bw7: '0'
-    bw8: '0'
-    bw9: '0'
-    clock_source0: ''
-    clock_source1: ''
-    clock_source2: ''
-    clock_source3: ''
-    clock_source4: ''
-    clock_source5: ''
-    clock_source6: ''
-    clock_source7: ''
     comment: ''
-    corr0: '0'
-    corr1: '0'
-    corr10: '0'
-    corr11: '0'
-    corr12: '0'
-    corr13: '0'
-    corr14: '0'
-    corr15: '0'
-    corr16: '0'
-    corr17: '0'
-    corr18: '0'
-    corr19: '0'
-    corr2: '0'
-    corr20: '0'
-    corr21: '0'
-    corr22: '0'
-    corr23: '0'
-    corr24: '0'
-    corr25: '0'
-    corr26: '0'
-    corr27: '0'
-    corr28: '0'
-    corr29: '0'
-    corr3: '0'
-    corr30: '0'
-    corr31: '0'
-    corr4: '0'
-    corr5: '0'
-    corr6: '0'
-    corr7: '0'
-    corr8: '0'
-    corr9: '0'
-    dc_offset_mode0: '0'
-    dc_offset_mode1: '0'
-    dc_offset_mode10: '0'
-    dc_offset_mode11: '0'
-    dc_offset_mode12: '0'
-    dc_offset_mode13: '0'
-    dc_offset_mode14: '0'
-    dc_offset_mode15: '0'
-    dc_offset_mode16: '0'
-    dc_offset_mode17: '0'
-    dc_offset_mode18: '0'
-    dc_offset_mode19: '0'
-    dc_offset_mode2: '0'
-    dc_offset_mode20: '0'
-    dc_offset_mode21: '0'
-    dc_offset_mode22: '0'
-    dc_offset_mode23: '0'
-    dc_offset_mode24: '0'
-    dc_offset_mode25: '0'
-    dc_offset_mode26: '0'
-    dc_offset_mode27: '0'
-    dc_offset_mode28: '0'
-    dc_offset_mode29: '0'
-    dc_offset_mode3: '0'
-    dc_offset_mode30: '0'
-    dc_offset_mode31: '0'
-    dc_offset_mode4: '0'
-    dc_offset_mode5: '0'
-    dc_offset_mode6: '0'
-    dc_offset_mode7: '0'
-    dc_offset_mode8: '0'
-    dc_offset_mode9: '0'
-    freq0: 434e6
-    freq1: 100e6
-    freq10: 100e6
-    freq11: 100e6
-    freq12: 100e6
-    freq13: 100e6
-    freq14: 100e6
-    freq15: 100e6
-    freq16: 100e6
-    freq17: 100e6
-    freq18: 100e6
-    freq19: 100e6
-    freq2: 100e6
-    freq20: 100e6
-    freq21: 100e6
-    freq22: 100e6
-    freq23: 100e6
-    freq24: 100e6
-    freq25: 100e6
-    freq26: 100e6
-    freq27: 100e6
-    freq28: 100e6
-    freq29: 100e6
-    freq3: 100e6
-    freq30: 100e6
-    freq31: 100e6
-    freq4: 100e6
-    freq5: 100e6
-    freq6: 100e6
-    freq7: 100e6
-    freq8: 100e6
-    freq9: 100e6
-    gain0: '10'
-    gain1: '10'
-    gain10: '10'
-    gain11: '10'
-    gain12: '10'
-    gain13: '10'
-    gain14: '10'
-    gain15: '10'
-    gain16: '10'
-    gain17: '10'
-    gain18: '10'
-    gain19: '10'
-    gain2: '10'
-    gain20: '10'
-    gain21: '10'
-    gain22: '10'
-    gain23: '10'
-    gain24: '10'
-    gain25: '10'
-    gain26: '10'
-    gain27: '10'
-    gain28: '10'
-    gain29: '10'
-    gain3: '10'
-    gain30: '10'
-    gain31: '10'
-    gain4: '10'
-    gain5: '10'
-    gain6: '10'
-    gain7: '10'
-    gain8: '10'
-    gain9: '10'
-    gain_mode0: 'False'
-    gain_mode1: 'False'
-    gain_mode10: 'False'
-    gain_mode11: 'False'
-    gain_mode12: 'False'
-    gain_mode13: 'False'
-    gain_mode14: 'False'
-    gain_mode15: 'False'
-    gain_mode16: 'False'
-    gain_mode17: 'False'
-    gain_mode18: 'False'
-    gain_mode19: 'False'
-    gain_mode2: 'False'
-    gain_mode20: 'False'
-    gain_mode21: 'False'
-    gain_mode22: 'False'
-    gain_mode23: 'False'
-    gain_mode24: 'False'
-    gain_mode25: 'False'
-    gain_mode26: 'False'
-    gain_mode27: 'False'
-    gain_mode28: 'False'
-    gain_mode29: 'False'
-    gain_mode3: 'False'
-    gain_mode30: 'False'
-    gain_mode31: 'False'
-    gain_mode4: 'False'
-    gain_mode5: 'False'
-    gain_mode6: 'False'
-    gain_mode7: 'False'
-    gain_mode8: 'False'
-    gain_mode9: 'False'
-    if_gain0: '20'
-    if_gain1: '20'
-    if_gain10: '20'
-    if_gain11: '20'
-    if_gain12: '20'
-    if_gain13: '20'
-    if_gain14: '20'
-    if_gain15: '20'
-    if_gain16: '20'
-    if_gain17: '20'
-    if_gain18: '20'
-    if_gain19: '20'
-    if_gain2: '20'
-    if_gain20: '20'
-    if_gain21: '20'
-    if_gain22: '20'
-    if_gain23: '20'
-    if_gain24: '20'
-    if_gain25: '20'
-    if_gain26: '20'
-    if_gain27: '20'
-    if_gain28: '20'
-    if_gain29: '20'
-    if_gain3: '20'
-    if_gain30: '20'
-    if_gain31: '20'
-    if_gain4: '20'
-    if_gain5: '20'
-    if_gain6: '20'
-    if_gain7: '20'
-    if_gain8: '20'
-    if_gain9: '20'
-    iq_balance_mode0: '0'
-    iq_balance_mode1: '0'
-    iq_balance_mode10: '0'
-    iq_balance_mode11: '0'
-    iq_balance_mode12: '0'
-    iq_balance_mode13: '0'
-    iq_balance_mode14: '0'
-    iq_balance_mode15: '0'
-    iq_balance_mode16: '0'
-    iq_balance_mode17: '0'
-    iq_balance_mode18: '0'
-    iq_balance_mode19: '0'
-    iq_balance_mode2: '0'
-    iq_balance_mode20: '0'
-    iq_balance_mode21: '0'
-    iq_balance_mode22: '0'
-    iq_balance_mode23: '0'
-    iq_balance_mode24: '0'
-    iq_balance_mode25: '0'
-    iq_balance_mode26: '0'
-    iq_balance_mode27: '0'
-    iq_balance_mode28: '0'
-    iq_balance_mode29: '0'
-    iq_balance_mode3: '0'
-    iq_balance_mode30: '0'
-    iq_balance_mode31: '0'
-    iq_balance_mode4: '0'
-    iq_balance_mode5: '0'
-    iq_balance_mode6: '0'
-    iq_balance_mode7: '0'
-    iq_balance_mode8: '0'
-    iq_balance_mode9: '0'
+    constellation: digital.constellation_bpsk().base()
+    damping: '1.0'
+    loop_bw: '0.0045'
+    max_dev: '4.5'
     maxoutbuf: '0'
     minoutbuf: '0'
-    nchan: '1'
-    num_mboards: '1'
-    sample_rate: samp_rate
-    sync: sync
-    time_source0: ''
-    time_source1: ''
-    time_source2: ''
-    time_source3: ''
-    time_source4: ''
-    time_source5: ''
-    time_source6: ''
-    time_source7: ''
-    type: fc32
+    nfilters: '128'
+    osps: '1'
+    pfb_mf_taps: '[]'
+    resamp_type: digital.IR_MMSE_8TAP
+    sps: '10'
+    ted_gain: '1.0'
+    ted_type: digital.TED_GARDNER
+    type: ff
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [968, 284.0]
+    rotation: 0
+    state: enabled
+- name: import_0
+  id: import
+  parameters:
+    alias: ''
+    comment: ''
+    imports: import math
   states:
     bus_sink: false
     bus_source: false
@@ -454,8 +252,26 @@ blocks:
     coordinate: [8, 100.0]
     rotation: 0
     state: true
-- name: qtgui_freq_sink_x_0
-  id: qtgui_freq_sink_x
+- name: m17_m17_decoder_0_0
+  id: m17_m17_decoder
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    debug_ctrl: 'False'
+    debug_data: 'True'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    threshold: '0.98'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1248, 276.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_eye_sink_x_0
+  id: qtgui_eye_sink_x
   parameters:
     affinity: ''
     alias: ''
@@ -470,50 +286,64 @@ blocks:
     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"'
+    color1: blue
+    color10: blue
+    color2: blue
+    color3: blue
+    color4: blue
+    color5: blue
+    color6: blue
+    color7: blue
+    color8: blue
+    color9: blue
     comment: ''
     ctrlpanel: 'False'
-    fc: '0'
-    fftsize: '1024'
-    freqhalf: 'True'
-    grid: 'False'
+    entags: 'True'
+    grid: 'True'
     gui_hint: ''
-    label: Relative Gain
-    label1: ''
-    label10: ''''''
-    label2: ''''''
-    label3: ''''''
-    label4: ''''''
-    label5: ''''''
-    label6: ''''''
-    label7: ''''''
-    label8: ''''''
-    label9: ''''''
+    label1: M17 baseband
+    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'
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    name: '""'
+    marker1: '-1'
+    marker10: '-1'
+    marker2: '-1'
+    marker3: '-1'
+    marker4: '-1'
+    marker5: '-1'
+    marker6: '-1'
+    marker7: '-1'
+    marker8: '-1'
+    marker9: '-1'
     nconnections: '1'
-    norm_window: 'False'
-    showports: 'False'
+    samp_per_symbol: '10'
+    size: int(samp_rate/10)
+    srate: samp_rate
+    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
-    units: dB
+    type: float
     update_time: '0.10'
     width1: '1'
     width10: '1'
@@ -525,16 +355,17 @@ blocks:
     width7: '1'
     width8: '1'
     width9: '1'
-    wintype: window.WIN_BLACKMAN_hARRIS
-    ymax: '10'
-    ymin: '-140'
+    ylabel: Amplitude
+    ymax: '5'
+    ymin: '-5'
+    yunit: '""'
   states:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [384, 56.0]
+    coordinate: [968, 172.0]
     rotation: 0
-    state: true
+    state: enabled
 - name: qtgui_time_sink_x_0
   id: qtgui_time_sink_x
   parameters:
@@ -590,8 +421,8 @@ blocks:
     marker9: '-1'
     name: '""'
     nconnections: '1'
-    size: '10240'
-    srate: samp_rate/10
+    size: '20000'
+    srate: '48000'
     stemplot: 'False'
     style1: '1'
     style10: '1'
@@ -629,17 +460,228 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [536, 168.0]
+    coordinate: [2232, 180.0]
+    rotation: 0
+    state: disabled
+- name: qtgui_time_sink_x_0_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: 'False'
+    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: 'False'
+    marker1: '-1'
+    marker10: '-1'
+    marker2: '-1'
+    marker3: '-1'
+    marker4: '-1'
+    marker5: '-1'
+    marker6: '-1'
+    marker7: '-1'
+    marker8: '-1'
+    marker9: '-1'
+    name: '""'
+    nconnections: '1'
+    size: '100'
+    srate: '4800'
+    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: 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: '5'
+    ymin: '-5'
+    yunit: '""'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1248, 172.0]
+    rotation: 0
+    state: disabled
+- name: rational_resampler_xxx_0_0
+  id: rational_resampler_xxx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    decim: int(1920000/samp_rate)
+    fbw: '0'
+    interp: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    taps: '[]'
+    type: ccc
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [232, 300.0]
+    rotation: 0
+    state: enabled
+- name: rational_resampler_xxx_1
+  id: rational_resampler_xxx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    decim: '1'
+    fbw: '0'
+    interp: '6'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    taps: '[]'
+    type: fff
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [2072, 268.0]
+    rotation: 0
+    state: enabled
+- name: root_raised_cosine_filter_0
+  id: root_raised_cosine_filter
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha: '0.5'
+    comment: ''
+    decim: '1'
+    gain: '1'
+    interp: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    ntaps: '81'
+    samp_rate: '10'
+    sym_rate: '1.0'
+    type: fir_filter_fff
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [760, 300.0]
+    rotation: 0
+    state: enabled
+- name: soapy_rtlsdr_source_0
+  id: soapy_rtlsdr_source
+  parameters:
+    affinity: ''
+    agc: 'False'
+    alias: ''
+    bias: 'False'
+    center_freq: int(433475000*(1+ppm*1e-6))
+    comment: ''
+    dev_args: ''
+    freq_correction: '0'
+    gain: rf_gain
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: '1920000'
+    type: fc32
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 316.0]
     rotation: 0
     state: true
+- name: vocoder_codec2_decode_ps_0
+  id: vocoder_codec2_decode_ps
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    mode: codec2.MODE_3200
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1744, 292.0]
+    rotation: 0
+    state: enabled
 
 connections:
-- [analog_nbfm_rx_0, '0', m17_m17_decoder_0, '0']
-- [analog_nbfm_rx_0, '0', qtgui_time_sink_x_0, '0']
-- [m17_m17_decoder_0, '0', blocks_null_sink_0, '0']
-- [osmosdr_source_0, '0', analog_nbfm_rx_0, '0']
-- [osmosdr_source_0, '0', qtgui_freq_sink_x_0, '0']
+- [analog_quadrature_demod_cf_0, '0', blocks_moving_average_xx_0, '0']
+- [analog_quadrature_demod_cf_0, '0', blocks_sub_xx_0, '0']
+- [blocks_moving_average_xx_0, '0', blocks_sub_xx_0, '1']
+- [blocks_packed_to_unpacked_xx_0, '0', blocks_stream_to_vector_0, '0']
+- [blocks_short_to_float_0, '0', rational_resampler_xxx_1, '0']
+- [blocks_stream_to_vector_0, '0', vocoder_codec2_decode_ps_0, '0']
+- [blocks_sub_xx_0, '0', root_raised_cosine_filter_0, '0']
+- [digital_symbol_sync_xx_0, '0', m17_m17_decoder_0_0, '0']
+- [digital_symbol_sync_xx_0, '0', qtgui_time_sink_x_0_0, '0']
+- [m17_m17_decoder_0_0, '0', blocks_packed_to_unpacked_xx_0, '0']
+- [rational_resampler_xxx_0_0, '0', analog_quadrature_demod_cf_0, '0']
+- [rational_resampler_xxx_1, '0', audio_sink_0, '0']
+- [rational_resampler_xxx_1, '0', qtgui_time_sink_x_0, '0']
+- [root_raised_cosine_filter_0, '0', digital_symbol_sync_xx_0, '0']
+- [root_raised_cosine_filter_0, '0', qtgui_eye_sink_x_0, '0']
+- [soapy_rtlsdr_source_0, '0', rational_resampler_xxx_0_0, '0']
+- [vocoder_codec2_decode_ps_0, '0', blocks_short_to_float_0, '0']
 
 metadata:
   file_format: 1
-  grc_version: 3.10.5.1
+  grc_version: 3.10.7.0