![]() The next stage still used rolling codes, but switched to the 315MHZ to get away from the Land Mobile Radio System (LMRS) used by the U.S. GARAGE DOOR SWEEP CODEThis system made it virtually impossible for a criminal to record and duplicate the code used to open and close the garage door. This system automatically recoded both the transmitter(remote) and the receiver(opener) to a new but common code each time the remote was used to open or close the garage door. The next stage of remotes operated in the 390 MHZ frequency, but new technology provided for rolling codes. Criminals also found they could make code grabbers that could record and retransmit a signal to open a garage door. ![]() This system worked fine until security became an issue because remotes were developed to quickly run through all frequencies in the 300-400 MHZ range thus finding the correct frequency to open a given garage door. These DIP pins frequencies operated in the 300-400 MHZ range. These DIP pin settings would set the frequency the opener and remote operated on. This was accomplished by sliding each of the nine DIP pins into matching position on the opener and the remotes. Then came the changing DIP pins that would allow the owner to program one or more remotes to their opener. This allowed each opener to have its own preset code. The DIP pins on the opener unit would be set identical to the DIP pins on the remote. Next came the invention of the DIP pin system (Also called DIP switch) were each opener and remote had 12 DIP pins. As technology improved the remote was invented and originally one remote would open your garage door, but it would also up any other garage door it was in range of. ![]() On the earliest garage door openers, the door could only be opened by a keypad mounted outside the garage door and hardwired in or a push button inside the garage. ![]()
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