SSTV

Decode the slow-scan TV pictures a radio receives, the space station's included, live or from a recording, and turn a picture into SSTV sound to transmit

Hold your phone near the radio's speaker, or connect the radio's audio output to the computer, then listen. Each picture is recognized by its header (Robot, Martin, Scottie and PD modes), or by its line rhythm if you join midway, and comes out straight even when the sound card's clock is a little off.

Or decode a recording: a WAV, an MP3, a video of the radio…