A spectrogram, displaying a signal consisting of diagonal lines.

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   blinry (blinry@chaos.social)'s status on Monday, 11-Mar-2024 05:22:27 JST blinry

   in reply to

   38: Catch a LoRaWAN chirp

   This was a bit like trying to catch a rare insect! 🐛

   LoRaWAN is a low-power, wide-area networking protocol, intended for "Internet of Things" applications.

   You can see transmission in the lower half of the screenshot! It has a very cute structure: You can see eight "down-chirps", followed by two "up-chirps". That's the header, followed by the payload.

   To look for the signal, I made a "baseband capture" in SDR++, and opened the recording in sonic-visualizer.