SDR

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SDR - Software Defined Radio is a way to listen to radio transmissions on various frequencies using a slightly modified Digital TV dongle (or a unit specifically designed for use as an SDR) on your computer. Using more advanced technologies, such as GNU Radio Companion, one can even set up a complete pipeline for intercepting and interpreting Morse code and various digital and analog signals.

With the proper SDR setup and a reasonably good antenna, one can easily listen to airport traffic control, radio-amateur transmissions and even satellites on the orbit, including the currently upcoming (launching 30 Jun. 2017) SKCube satellite that led to the creation of Slovakia's very first official space program.

(TBC)