It’s no secret that artists are known for incorporating hidden messages in their work, from The Beatles’ track ‘Lucy in the Sky with Diamonds’ spelling LSD to the backmasking of Missy Elliot’s "flip ...

The radio hackers in the audience will be familiar with a spectrogram display, but for the uninitiated, it’s basically a visual representation of how a range of frequencies are changing with time.

Here’s an interesting use for an old organ. Let it get in on your Ham radio action. [Forrest Cook] is showing off his project which uses a Hammond Organ to encode messages which can be displayed by a ...