diff --git a/audio_costas.grc b/costas/audio_costas.grc
similarity index 100%
rename from audio_costas.grc
rename to costas/audio_costas.grc
diff --git a/costas/costas b/costas/costas
new file mode 100755
index 0000000..82dd5ca
Binary files /dev/null and b/costas/costas differ
diff --git a/costas.c b/costas/costas.c
similarity index 100%
rename from costas.c
rename to costas/costas.c
diff --git a/from_audio.grc b/costas/from_audio.grc
similarity index 100%
rename from from_audio.grc
rename to costas/from_audio.grc
diff --git a/oszi.grc b/costas/oszi.grc
similarity index 100%
rename from oszi.grc
rename to costas/oszi.grc
diff --git a/resample_recording.grc b/costas/resample_recording.grc
similarity index 100%
rename from resample_recording.grc
rename to costas/resample_recording.grc
diff --git a/view_waterfall.grc b/costas/view_waterfall.grc
similarity index 100%
rename from view_waterfall.grc
rename to costas/view_waterfall.grc
diff --git a/wobble.grc b/costas/wobble.grc
similarity index 100%
rename from wobble.grc
rename to costas/wobble.grc
diff --git a/fft-beacon-finder/generate-testdata.grc b/fft-beacon-finder/generate-testdata.grc
new file mode 100644
index 0000000..563bbd9
--- /dev/null
+++ b/fft-beacon-finder/generate-testdata.grc
@@ -0,0 +1,380 @@
+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: generate_testdata
+    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: Not titled yet
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [8, 8]
+    rotation: 0
+    state: enabled
+
+blocks:
+- name: samp_rate
+  id: variable
+  parameters:
+    comment: ''
+    value: '1000000'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [184, 12]
+    rotation: 0
+    state: enabled
+- name: analog_noise_source_x_0
+  id: analog_noise_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '0.001'
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    noise_type: analog.GR_GAUSSIAN
+    seed: '0'
+    type: complex
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [984, 148.0]
+    rotation: 0
+    state: true
+- name: analog_sig_source_x_0
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '1'
+    comment: ''
+    freq: '0.01'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    type: float
+    waveform: analog.GR_COS_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [648, 324.0]
+    rotation: 0
+    state: true
+- name: analog_sig_source_x_1
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '1'
+    comment: ''
+    freq: '-250000'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    type: complex
+    waveform: analog.GR_COS_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [208, 132.0]
+    rotation: 0
+    state: true
+- name: analog_sig_source_x_1_0
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '1'
+    comment: ''
+    freq: '250000'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    type: complex
+    waveform: analog.GR_COS_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [208, 260.0]
+    rotation: 0
+    state: true
+- name: analog_sig_source_x_1_0_0
+  id: analog_sig_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    amp: '1'
+    comment: ''
+    freq: '0'
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    offset: '0'
+    phase: '0'
+    samp_rate: samp_rate
+    type: complex
+    waveform: analog.GR_COS_WAVE
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [208, 404.0]
+    rotation: 0
+    state: true
+- name: blocks_add_xx_0
+  id: blocks_add_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_inputs: '2'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1192, 240.0]
+    rotation: 0
+    state: true
+- name: blocks_add_xx_1
+  id: blocks_add_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_inputs: '3'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [576, 224.0]
+    rotation: 0
+    state: true
+- name: blocks_file_sink_0
+  id: blocks_file_sink
+  parameters:
+    affinity: ''
+    alias: ''
+    append: 'False'
+    comment: ''
+    file: input.raw
+    type: complex
+    unbuffered: 'False'
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1320, 236.0]
+    rotation: 0
+    state: true
+- name: blocks_multiply_xx_0
+  id: blocks_multiply_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_inputs: '2'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1048, 256.0]
+    rotation: 0
+    state: true
+- name: blocks_multiply_xx_1
+  id: blocks_multiply_xx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    num_inputs: '2'
+    type: complex
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [448, 448.0]
+    rotation: 0
+    state: true
+- name: blocks_vco_c_0
+  id: blocks_vco_c
+  parameters:
+    affinity: ''
+    alias: ''
+    amplitude: '1.0'
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    samp_rate: samp_rate
+    sensitivity: '10000'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [864, 348.0]
+    rotation: 0
+    state: true
+- name: blocks_vector_source_x_0
+  id: blocks_vector_source_x
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    repeat: 'True'
+    tags: '[]'
+    type: float
+    vector: (1, 1, -1, -1, 1, -1, 1, -1)
+    vlen: '1'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [32, 572.0]
+    rotation: 0
+    state: true
+- 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: '511'
+    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: window.WIN_BLACKMAN_hARRIS
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [1320, 124.0]
+    rotation: 0
+    state: true
+- name: rational_resampler_xxx_0
+  id: rational_resampler_xxx
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    decim: '800'
+    fbw: '0'
+    interp: samp_rate
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    taps: '[]'
+    type: fcc
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [232, 564.0]
+    rotation: 0
+    state: true
+
+connections:
+- [analog_noise_source_x_0, '0', blocks_add_xx_0, '0']
+- [analog_sig_source_x_0, '0', blocks_vco_c_0, '0']
+- [analog_sig_source_x_1, '0', blocks_add_xx_1, '0']
+- [analog_sig_source_x_1_0, '0', blocks_add_xx_1, '1']
+- [analog_sig_source_x_1_0_0, '0', blocks_multiply_xx_1, '0']
+- [blocks_add_xx_0, '0', blocks_file_sink_0, '0']
+- [blocks_add_xx_0, '0', qtgui_waterfall_sink_x_0, '0']
+- [blocks_add_xx_1, '0', blocks_multiply_xx_0, '0']
+- [blocks_multiply_xx_0, '0', blocks_add_xx_0, '1']
+- [blocks_multiply_xx_1, '0', blocks_add_xx_1, '2']
+- [blocks_vco_c_0, '0', blocks_multiply_xx_0, '1']
+- [blocks_vector_source_x_0, '0', rational_resampler_xxx_0, '0']
+- [rational_resampler_xxx_0, '0', blocks_multiply_xx_1, '1']
+
+metadata:
+  file_format: 1