How many times you needed some remote control to handle some electric device ? Many times. There are lot of remote controls like infrared, RF, SMS (like my other circuit) and more. The basic small-range remote controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is that the signal can not pass the walls. So, if you want to control your garage door, the only way is to use some RF remote control. The circuit (transmitter and receiver) uses few components and ordinary (I love few component circuits) . It's easy to be built because you don't have to tune-up any coil or variable capacitor. The RF modules are fix to work in 418MHz area.
I have designed this remote control considering :
a.) the verification of the received data because many other devices are working in this frequency (418MHz)
b.) and the power-saving of the transmitter. A transmitter must have long battery life. It's not the best choice for you to change the battery every 3 days ;) . I don't care about the receiver`s power supply, because receiver must be working all the time.