diff --git a/lab2/power-hackrf.grc b/lab2/power-hackrf.grc
new file mode 100644
index 0000000..7de973e
--- /dev/null
+++ b/lab2/power-hackrf.grc
@@ -0,0 +1,296 @@
+options:
+  parameters:
+    author: ja
+    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: receiver_hackrf
+    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: receiver-hackrf
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: freq
+  id: variable
+  parameters:
+    comment: ''
+    value: int(0.9e9)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [312, 12.0]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: int(2e6)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [200, 12]
+    rotation: 0
+    state: enabled
+- name: blocks_complex_to_mag_squared_0
+  id: blocks_complex_to_mag_squared
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [504, 272.0]
+    rotation: 0
+    state: enabled
+- name: blocks_nlog10_ff_0
+  id: blocks_nlog10_ff
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    k: '10'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    n: '1'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [720, 268.0]
+    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: '0.1'
+    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: '""'
+    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: '0.01'
+    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: [496, 132.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_number_sink_0
+  id: qtgui_number_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    autoscale: 'True'
+    avg: '0'
+    color1: ("black", "black")
+    color10: ("black", "black")
+    color2: ("black", "black")
+    color3: ("black", "black")
+    color4: ("black", "black")
+    color5: ("black", "black")
+    color6: ("black", "black")
+    color7: ("black", "black")
+    color8: ("black", "black")
+    color9: ("black", "black")
+    comment: ''
+    factor1: '1'
+    factor10: '1'
+    factor2: '1'
+    factor3: '1'
+    factor4: '1'
+    factor5: '1'
+    factor6: '1'
+    factor7: '1'
+    factor8: '1'
+    factor9: '1'
+    graph_type: qtgui.NUM_GRAPH_HORIZ
+    gui_hint: ''
+    label1: ''
+    label10: ''
+    label2: ''
+    label3: ''
+    label4: ''
+    label5: ''
+    label6: ''
+    label7: ''
+    label8: ''
+    label9: ''
+    max: '1'
+    min: '-1'
+    name: '""'
+    nconnections: '1'
+    type: float
+    unit1: ''
+    unit10: ''
+    unit2: ''
+    unit3: ''
+    unit4: ''
+    unit5: ''
+    unit6: ''
+    unit7: ''
+    unit8: ''
+    unit9: ''
+    update_time: '0.10'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [928, 244.0]
+    rotation: 0
+    state: enabled
+- name: soapy_hackrf_source_0
+  id: soapy_hackrf_source
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: 'True'
+    bandwidth: '0'
+    center_freq: freq
+    comment: ''
+    dev_args: ''
+    gain: '20'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fc32
+    vga: '20'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [56, 164.0]
+    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: [56, 236.0]
+    rotation: 0
+    state: disabled
+
+connections:
+- [blocks_complex_to_mag_squared_0, '0', blocks_nlog10_ff_0, '0']
+- [blocks_nlog10_ff_0, '0', qtgui_number_sink_0, '0']
+- [soapy_hackrf_source_0, '0', blocks_complex_to_mag_squared_0, '0']
+- [soapy_hackrf_source_0, '0', qtgui_freq_sink_x_0, '0']
+- [soapy_rtlsdr_source_0, '0', blocks_complex_to_mag_squared_0, '0']
+- [soapy_rtlsdr_source_0, '0', qtgui_freq_sink_x_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0
diff --git a/lab2/power-nooelec.grc b/lab2/power-nooelec.grc
new file mode 100644
index 0000000..1ed4617
--- /dev/null
+++ b/lab2/power-nooelec.grc
@@ -0,0 +1,295 @@
+options:
+  parameters:
+    author: ja
+    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: receiver_nooelec
+    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: receiver-nooelec
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: freq
+  id: variable
+  parameters:
+    comment: ''
+    value: int(0.9e9)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [312, 12.0]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: int(2e6)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [200, 12]
+    rotation: 0
+    state: enabled
+- name: blocks_complex_to_mag_squared_0
+  id: blocks_complex_to_mag_squared
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [504, 272.0]
+    rotation: 0
+    state: enabled
+- name: blocks_nlog10_ff_0
+  id: blocks_nlog10_ff
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    k: '10'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    n: '1'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [720, 268.0]
+    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: '0.1'
+    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: '""'
+    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: '0.01'
+    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: [496, 132.0]
+    rotation: 0
+    state: enabled
+- name: qtgui_number_sink_0
+  id: qtgui_number_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    autoscale: 'True'
+    avg: '0'
+    color1: ("black", "black")
+    color10: ("black", "black")
+    color2: ("black", "black")
+    color3: ("black", "black")
+    color4: ("black", "black")
+    color5: ("black", "black")
+    color6: ("black", "black")
+    color7: ("black", "black")
+    color8: ("black", "black")
+    color9: ("black", "black")
+    comment: ''
+    factor1: '1'
+    factor10: '1'
+    factor2: '1'
+    factor3: '1'
+    factor4: '1'
+    factor5: '1'
+    factor6: '1'
+    factor7: '1'
+    factor8: '1'
+    factor9: '1'
+    graph_type: qtgui.NUM_GRAPH_HORIZ
+    gui_hint: ''
+    label1: ''
+    label10: ''
+    label2: ''
+    label3: ''
+    label4: ''
+    label5: ''
+    label6: ''
+    label7: ''
+    label8: ''
+    label9: ''
+    max: '1'
+    min: '-1'
+    name: '""'
+    nconnections: '1'
+    type: float
+    unit1: ''
+    unit10: ''
+    unit2: ''
+    unit3: ''
+    unit4: ''
+    unit5: ''
+    unit6: ''
+    unit7: ''
+    unit8: ''
+    unit9: ''
+    update_time: '0.10'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [928, 244.0]
+    rotation: 0
+    state: enabled
+- name: soapy_hackrf_source_0
+  id: soapy_hackrf_source
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: 'True'
+    bandwidth: '0'
+    center_freq: freq
+    comment: ''
+    dev_args: ''
+    gain: '20'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fc32
+    vga: '20'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [56, 164.0]
+    rotation: 0
+    state: disabled
+- 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: [56, 236.0]
+    rotation: 0
+    state: enabled
+
+connections:
+- [blocks_complex_to_mag_squared_0, '0', blocks_nlog10_ff_0, '0']
+- [blocks_nlog10_ff_0, '0', qtgui_number_sink_0, '0']
+- [soapy_hackrf_source_0, '0', qtgui_freq_sink_x_0, '0']
+- [soapy_rtlsdr_source_0, '0', blocks_complex_to_mag_squared_0, '0']
+- [soapy_rtlsdr_source_0, '0', qtgui_freq_sink_x_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0
diff --git a/lab2/sumtransmitter-hackrf.grc b/lab2/sumtransmitter-hackrf.grc
new file mode 100644
index 0000000..d11c622
--- /dev/null
+++ b/lab2/sumtransmitter-hackrf.grc
@@ -0,0 +1,470 @@
+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: transmitter
+    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: transmitter-hackrf
+    window_size: (1000,1000)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: cutoff
+  id: variable
+  parameters:
+    comment: ''
+    value: int(40e3)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [504, 12.0]
+    rotation: 0
+    state: disabled
+- name: freq
+  id: variable
+  parameters:
+    comment: ''
+    value: int(10e3)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [304, 12.0]
+    rotation: 0
+    state: enabled
+- name: freq2
+  id: variable
+  parameters:
+    comment: ''
+    value: int(50e3)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [400, 12.0]
+    rotation: 0
+    state: enabled
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: int(2e6)
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [200, 12]
+    rotation: 0
+    state: enabled
+- name: analog_sig_source_x_0
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '0.5'
+    comment: ''
+    freq: freq
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    showports: 'False'
+    type: float
+    waveform: analog.GR_SIN_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 124.0]
+    rotation: 0
+    state: enabled
+- name: analog_sig_source_x_0_0
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '0.5'
+    comment: ''
+    freq: freq2
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    showports: 'False'
+    type: float
+    waveform: analog.GR_SIN_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [64, 268.0]
+    rotation: 0
+    state: enabled
+- name: blocks_add_xx_0
+  id: blocks_add_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_inputs: '2'
+    type: float
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [328, 224.0]
+    rotation: 0
+    state: enabled
+- name: blocks_float_to_complex_0
+  id: blocks_float_to_complex
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [600, 264.0]
+    rotation: 0
+    state: enabled
+- name: blocks_null_source_0
+  id: blocks_null_source
+  parameters:
+    affinity: ''
+    alias: ''
+    bus_structure_source: '[[0,],]'
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_outputs: '1'
+    type: float
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [432, 336.0]
+    rotation: 0
+    state: enabled
+- name: filter_fft_low_pass_filter_0
+  id: filter_fft_low_pass_filter
+  parameters:
+    affinity: ''
+    alias: ''
+    beta: '6.76'
+    comment: ''
+    cutoff_freq: cutoff
+    decim: '1'
+    gain: '1'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    nthreads: '1'
+    samp_rate: samp_rate
+    type: ccc
+    width: int(5e3)
+    win: window.WIN_HAMMING
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [848, 60.0]
+    rotation: 0
+    state: disabled
+- 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: '""'
+    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: [544, 484.0]
+    rotation: 0
+    state: disabled
+- name: qtgui_sink_x_0
+  id: qtgui_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    bw: samp_rate
+    comment: ''
+    fc: '700'
+    fftsize: '1024'
+    gui_hint: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    name: '""'
+    plotconst: 'True'
+    plotfreq: 'True'
+    plottime: 'True'
+    plotwaterfall: 'True'
+    rate: '10'
+    showports: 'False'
+    showrf: 'False'
+    type: complex
+    wintype: window.WIN_BLACKMAN_hARRIS
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [840, 476.0]
+    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: ''
+    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: '1'
+    size: '1024'
+    srate: samp_rate
+    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: [840, 372.0]
+    rotation: 0
+    state: disabled
+- name: soapy_hackrf_sink_0
+  id: soapy_hackrf_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: 'True'
+    bandwidth: '0'
+    center_freq: 2e9
+    comment: ''
+    dev_args: ''
+    samp_rate: samp_rate
+    type: fc32
+    vga: '40'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [840, 280.0]
+    rotation: 0
+    state: enabled
+- name: soapy_hackrf_source_0
+  id: soapy_hackrf_source
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: 'True'
+    bandwidth: '0'
+    center_freq: freq
+    comment: ''
+    dev_args: ''
+    gain: '20'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    type: fc32
+    vga: '20'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [96, 492.0]
+    rotation: 0
+    state: disabled
+
+connections:
+- [analog_sig_source_x_0, '0', blocks_add_xx_0, '0']
+- [analog_sig_source_x_0_0, '0', blocks_add_xx_0, '1']
+- [blocks_add_xx_0, '0', blocks_float_to_complex_0, '0']
+- [blocks_float_to_complex_0, '0', qtgui_sink_x_0, '0']
+- [blocks_float_to_complex_0, '0', qtgui_time_sink_x_0, '0']
+- [blocks_float_to_complex_0, '0', soapy_hackrf_sink_0, '0']
+- [blocks_null_source_0, '0', blocks_float_to_complex_0, '1']
+- [soapy_hackrf_source_0, '0', qtgui_freq_sink_x_0, '0']
+
+metadata:
+  file_format: 1
+  grc_version: 3.10.11.0