The transmitter would transmit on a designated frequency.
Garage door opener drive mechanism.
Belt drive garage door openers are almost similar to chain drive mechanisms but in this type of system a wide belt is used instead of a metal chain.
The first garage door opener remote controls were simple and consisted of a simple transmitter the remote and receiverwhich controlled the opener mechanism.
The machine also slows a door in transit preventing it from crashing to the garage floor.
The drive mechanism is a device which keeps your garage opener turning and lifts the steel bar that keeps the door closed when it is not being used.
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It operates using a switch that activates the wide rubber belt which either pulls the trolley up a track to raise the door or pushes it down a track to lower the door.
This type of drive system runs along the rail and wraps around a sprocket located on the top of the opener.
If this part of your screw drive garage door opener becomes damaged it can be difficult to repair or replace without removing the whole mechanism.
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The receiver would listen for the radio signal then open or close the garage depending on the door position.