We are given an .iq file. For those new to radio, this stands for in-phase and quadrature data, and is commonly used in storage of radio transmission and such due to its compact and efficient “format” (it’s really just a big stream of bytes).

The title of the challenge suggests morse code. Let’s open the file in a tool such as Inspectrum which can open and interpret .iq data.

Sure enough, there it is! All we need to do is transform this back into readable text. Let’s first convert it to something in text, then pass it to a morse decoder.

. means a short, _ means a long. 
/ is used to separate letters for easier reading. 

.. / ._. / .. / ... / _._. / _ / .._. / _. / _____ / .____ / ... / ...__ / __. / _____ / _ / _. / _____ / _ / .... / .____ / _. / __. / _____ / _. / __ / _.__ / __ / _____ / ._. / ... / .

Using a decoder such as one like this, we get the flag!

Flag: irisctf{n01s3_g0t_n0th1ng_0n_my_m0rse}