I'm the founder of signalseverywhere a youtube channel dedicated to learning and teaching software defined radio.
I built a ruby powered application that gates messages from the APRS network to twitter. It has been used to send messages to twitter from a radio message sent to the international space station.
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I made a video to show you what I am finding with comparing SDRs. It is at
and I added a project on HackaDay.IO to keep my notes, intending to build something in the 20 GHz and higher range.