> For the complete documentation index, see [llms.txt](https://ctf.zeyu2001.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ctf.zeyu2001.com/2021/dawgctf-2021/babys-first-modulation.md).

# Baby's First Modulation

## Problem

Our listening station caught this RF recording of a guy reading off the flag. It's FM modulated.

rf1.iq: <https://drive.google.com/file/d/1TSOt9YrljsE8ETSlXRsGLy3Qo8M3g3jQ/view?usp=sharing>

This IQ file was saved in standard GNURadio format (complex, 32bit float I, 32bit float Q)

Author: nb

## Solution

Open the `.iq` file in GNURadio and apply the demodulation.

![](/files/-M_EP-RoI6NM3rZauZ7Z)