Decoding a garage door opener with an RTL-SDR

Jul 12, 2016 · 8 min read

Button presses visible on the right
The low-pass filter is now decimating by 10, so the scale of X has changed.
Green is magnitude; blue is demodulated audio (normalized wrt. signal amplitude, I guess).
Zooming in, we can see the code transmitting on/off
And zoomed in to see two blasts of the code

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