Posts Tagged rf

From RF to bytes with an RTL-SDR

I recently un-earthed my RTL-SDR after moving. I also received two RF remote controls for the garage door. It seemed like a good idea to put the two together to see if I could discover what the remotes were transmitting.

The back of one of the remote controls handily listed it’s serial number, FCC ID and the frequency on which it transmits. In this case it transmits at 318MHz. I was expecting that it encoded the transmitted data with On-Off Keying (OOK), also called Amplitude Shift Keying (ASK). OOK is quite simple to generate and decode, which helps keep costs down. The device has multiple buttons, so some bits identifying the pressed button were expected. The serial number was also expected to be present, as well as a code of some description.
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