A tech enthusiast named Blinry took a week-long dive into the world of software defined radio (SDR), discovering the invisible universe of electromagnetic signals surrounding us. Using a $30 USB dongle and some wire, he accessed a treasure trove of radio communications.

Blinry decoded images from weather satellites, viewing Earth in real-time, and tracked a weather balloon into a swampy forest. He intercepted data from neighbors' sensors and utility meters. He listened to number stations and a Russian "buzzer" signal ("The purpose of the station is unclear, but most theories think it's military communication.").

He used a smartphone's NFC signal to send Morse code through walls and detected when someone turned on a smartphone across the apartment. He received Morse code from an Italian s

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