ARLA/CLUSTER: SSTV Beacon desde Budapeste com um Raspberry Pi

[João Costa > CT1FBF]

The Budapest hackerspace did some joint work with a local ham radio club
and created an SSTV beacon <http://hsbp.org/rpi-sstv> housed inside a CCTV
case that takes an image of its environment and transmits it using slow-scan
television <https://en.wikipedia.org/wiki/Slow-scan_television> over ham
bands.

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, PySSTV
<https://pypi.python.org/pypi/PySSTV>is used to convert images to
frequency/time tuples, UNIXSSTV then creates the actual audio file and
finally sox <http://sox.sourceforge.net/> 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).
The plans, schematics and source code are available, so they hope that
other hackerspaces will join the ranks!

Mais em:
http://webcache.googleusercontent.com/search?q=cache:ZPgMe6EzMV0J:hackaday.com/2013/10/06/sstv-beacon-based-on-a-raspberry-pi/+&cd=2&hl=pt-PT&ct=clnk&gl=pt
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