<p>The Budapest hackerspace did some joint work with a local ham radio club and created an <a href="http://hsbp.org/rpi-sstv" target="_blank">SSTV beacon</a> housed inside a CCTV case that takes an image of its environment and transmits it using <a href="https://en.wikipedia.org/wiki/Slow-scan_television" target="_blank">slow-scan television</a> over ham bands.</p>
<p>As the title says, the build uses a Raspberry Pi to process the image taken from its camera and then transmits it over the air using a Ricofunk UHF transceiver with a main frequency of 433.425MHz. On the software side, <a href="https://pypi.python.org/pypi/PySSTV" target="_blank">PySSTV </a>is used to convert images to frequency/time tuples, UNIXSSTV then creates the actual audio file and finally <a href="http://sox.sourceforge.net/" target="_blank">sox</a> plays it. To avoid screwing up the Raspberry SD card, every part of the filsystem is either mounted in read-only mode (things like /home and /usr) or uses a ramdisk (things like /tmp and logs).</p>
<div>The plans, schematics and source code are available, so they hope that other hackerspaces will join the ranks!</div>
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