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.

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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

DesktopSDR.com book release postponed to 5th Sept. 2015

On the official desktopsdr.com website is state since today that their already postponed release date from the 31.st August is postponed to the 5.th September 2015. Let’s hope it’s for the best and that the team can finish everything in time to deliver a nice work. Folks like me would be glad if they would release the first chapter or so, or an Amazon pre-buying link etc.

Black Magic for Computer Scientists

Signals and deeper singal theory is still perceived as “Black Magic” by computer scientists and avoided or overshaded by confuse implementations. Jack Schaedler wanted to change this and introduced a pretty nice looking introduction to circle sines and  signals, condensend in “a compact primer on digital signal processing“. For all those people out there who ever wanted to understand how a DFT or FFT works and only heard little about the topic, this might be a good introduction to it. It is nicely designed and covers all basic topics from discrete signals, to mathematical representations up until Nyquist-theorem or Aliasing. With  embedded moving examples the theory is presented in a nice graphical way for an easy understanding.

Modification of sodera.de

In the next weeks this page will be transferred to English, because i think i can reach a bigger audience, than in German.

ToDo:

  • Translate posts from German to English
  • Design modifications
  • New articles
  • Test new plugins for comments, community etc.