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fishfinder's Introduction

Decoding & Reversing the FishFinder

Requisites

  • Python (2.7)
  • Gnuradio (v3.7+)

Example usage

Extracting packets from a recording:

Generate the python script:

grcc -d . bits.grc

Run the script and extract valid packets:

cat example-*.cfile | python -u ./ff_fsk.py | ./sanitize

This expects a 16Msps recording with the FishFinder signal at 2.15MHz offset. These values can be changed in the .grc

Interactively verify demodulation:

Use bits_gui.grc:

gnuradio-companion bits_gui.grc

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