Everyone from first responders to hotel cleaning staff use radios operating in the sub-megahertz range to communicate, often without even encoding the transmission. While encoding and encryption are increasingly used in radio communication, an RTL-SDR adapter and smartphone are all it takes to start listening in on radio conversations happening around you.

Why SDR Matters

A software-defined radio (SDR) takes the parts of radio tuning that was normally done by crystals or local oscillators and accomplishes them with software instead. The basic requirements for using an SDR are a computer, a… more


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