fwdemod

FW decoder using RTL SDR software-defined radio

Setup

RTL-SDR Setup

Windows

Install librtlsdr into C:\Windows\System32

Make sure you download the 32/64 bit package that matches your Python install.

Python for Windows often (counterintuitively) directs users to the 32bit version by default.

Note: you cannot import the rtlsdr Python library when the RTL-SDR device isn't connected to the PC.

Ubuntu Linux

sudo apt update
sudo apt install librtlsdr-dev

fwdemod Application Setup

Install the required packages by executing

python -m pip install -r requirements.txt

Usage

grab

python grab.py -h

Will show all the options and arguments that are avliable for the program. grab.py scans the radios and will display the packets it captured. When the program finishes, it will list all the radios that are captured and its parameters.

Args

-r run time(default 112 seconds)

-t sample time(default 5, opts: 1-8)

-x Rf data rate(default 3, opts: 2/3)

If an output file specified it will save all the info to the file.

plot

python plot.py -h

Will display all the options. Plot.py plots a spectrum for the given sample file.

Notes

• if grab.py dump displays nothing make sure that the right type of antenna used. Also a different RF data rate can be used. Run the scan again and specify RF data rate by -x
• If Min/Max says "Min/Max: Lots!!" try increasing the sample time. It can be specified by -t(5 or above recommended)
• Increasing the run time will help gathering more information about the radios.