Kommunikation via waterfall display - hell-schreiber på steroider

Har nogen prøvet at sende billeder til waterfall display?

En ny måde at udveksle QSL-kort på?:

Encoding pictures in frequency waterfall display:
https://www.youtube.com/watch?v=ugdgYl9aLXY

KQ4ZH Sending waterfall pics:
https://www.youtube.com/watch?v=VS7MHgjJAag

Some Odd Things on the Radio:
https://www.youtube.com/watch?v=OffrnGB4RpY

-

Hvordan bliver det gjort?:

Converting images to IQ streams that make images appear in waterfall plots:
https://github.com/polygon/spectrum_painter

August 22, 2015, Spectrum Painting on 2.4 GHz:
http://hackaday.com/2015/08/22/spectrum-paintin g-on-2-4-ghz/
Quote: "...
Give a software-defined radio (SDR) platform to a few thousand geeks, and it’s pretty predictable what will happen: hackers gotta hack. We’re only surprised that it’s happening so soon. Spectrum Painter is one of the first cool hacks to come out of the rad1o badge given out at the CCCamp 2015. It makes it dead-simple to send images in Hellschreiber mode on a few different SDR hardware platforms.
..."

An OFDM Spectrum Painter for GNU Radio:
https://github.com/drmpeg/gr-paint

-

Han forklarer waterfall displays med gule badeænder :-)

Waterfall Displays Explained: Ask Dave #21:
https://www.youtube.com/watch?v=91XtLZNIyK8

-

Unknown audio waveform containing hidden images:
https://www.youtube.com/watch?v=FnzIpAAzP3w

SonicPhoto - What do pictures sound like?:
https://www.youtube.com/watch?v=8BGr1u-Oz8M

Dette program fås til både Windows og Mac:
http://photosounder.com/download.php