GNURadio conference (GRCon15) presentations

The GNU Radio conference (GRCon15) is a yearly conference discussing all matters related to GNU Radio, an open source graphical block based DSP programming application that is compatible with most SDRs, including the RTL-SDR. Many of the presentation slides are now available for viewing on their  website.

There are many interesting presenations like how to start building an SDR from scratch, getting startet with tools like GNU Radio, Pybombs etc., but also more important topics of the near future e.g. how to get GNURadio into undergraduate schedules or how to implement SDR platforms into mobile computing platforms.

Continue reading

Decoding Immarsat geostationary satellite text messages

A nice hack has been published on how to decode satellite-based text messages (STD-C EGC) of an Immarsat geosat. Those messages include information about search and rescue, coast guard, weather and much more. The hack consists of a tutorial on how to build a cheap antenna out of a modified GPS or helix antenna and how to pipe the outputs into SDR# and then to display messages with a program called tdma-demo.exe, which despreads the messages from the time division coding. Continue reading

Spectrum Painting in open bands with HackRF

One of the outcomes of the Chaos Communication camp and the handed out badge (rad10 badge – an adaption of the HackRF) was playing around with the idea of painting pictures on the RF spectrum with the HackRF – a low cost transmit capable software defined radio. This idea works simply by modulating a signal so that it produces a desired image pattern on a frequency domain waterfall display. Continue reading