Reverse engineering an ancient wireless security keypad using RTL-SDR
You can use a similar technique to clone a garage door remote control. You simply have to record the transmission using the techniques mentioned in this post, then rebroadcast it on the same frequency.Broadcasting FM is as simple as loading a Raspberry Pi up with PiFM[0]. Or, if you don't have the original remote (but are a bit more technical), you can just brute force the combination; most remotes only use a 12-bit DIP switch (4096 combinations)[1].[0] https://github.com/CodyJHeiser/PiStation
[1] http://samy.pl/opensesame/