The slides from my presentation about GNU Radio and the Universal Software Radio Peripheral given at the AMSAT UK colloquium on August 1, 2010. A video recording is also available at http://www.batc.tv/ under archived videos. I had two embedded videos that slideshare can not handle so I had to replace them with links to video files. The videos are excerpts from my videos showing reception of packet radio from the ISS and the experimental DVB setup I wrote about few days ago.