Garage door opener transmitters came on the market shortly after WWII. They worked on the same principle as remote bomb detonators used in the war.
The original garage door opener transmitter was a low power, short range device, operating with a single frequency radio signal.
This became a problem as automatic garage door openers became popular. You would use your remote to open your garage door and open the neighbor's door as well. Anyone could drive down the street and open anyone else's garage door equipped with an automatic garage door opener.
By the 1970's transmitters were a bit more sophisticated. They came with 8 dip switches so users could change the frequency by resetting the dip switches. You have to set the dip switches to the same setting on the opener as well as on the transmitter.
This provided some security, but not a lot. Eight dip switches meant there were 256 possible combinations.
Todays rolling code technology can produce billions of possible code combinations. The code changes each time the remote is used, making code grabbers useless and increasing security many times over. No one can steal your code out of the air to operate your garage door since the last code used no longer works.
Todays garage door opener transmitters come in a variety of styles and functions. We have key fob remotes, wall mount, wireless-keyless systems, and visor clip-ons, as well as the Homelink remote installed in some new vehicle models.
Multi-button remotes can also be programmed to operate multiple doors, lights and door locks.
When shopping for replacement garage door opener transmitters make sure you choose one compatible with your unit. Even the universal operators such as the multicode 3060 linear are not truly universal as they won't work with all brands.
If your key fob or clip on remote has issues such as no range, try replacing the battery - this often solves the problem.
Replacement remotes for units such as the genie blue max can easily be found online and at Home Centers such as Home Depot and Lowes.Home > Garage Door Opener Articles > Garage Door Opener Transmitters