how remote controls work - car alarm remote control
Radio remote control-frequency (RF)
Remote control is common. Garage-
Door opener, car
Alarm and radio-
The remote control toy has been using the radio remote control, and the technology has begun to appear in other applications.
It's still rare at home.
Theater equipment (
In addition to the RF extender, we will discuss it on the next page)
But you will find the RF remote control that controls some satellites.
TV receiver and high
You can also find Bluetooth
Remote control for laptop and smartphone. (
Learn about this radio technology and how Bluetooth works. )
The RF remote control is not sending light signals, but radio waves corresponding to the binary command of the button you are pressing.
The radio receiver on the control device receives the signal and decodes it.
The problem with the RF remote control is that at any given time, the number of radio signals flying through the air is very large.
Mobile phone, Walkie Talkie
Walkie-Talkie, WiFi setup and cordless phones all transmit radio signals at different frequencies.
The RF remote control solves the interference problem by transmitting at a specific radio frequency and embedding a digital address code in the radio signal.
This lets the radio receiver on the intended device know when to respond to the signal and when to ignore the signal.
Learn more about radio technology
Frequency remote control to see how the remote input works.
The biggest advantage of radio
The frequency remote controls are their range: they can be transmitted up to 100 feet from the receiver (
Shorter range of Bluetooth)
Radio signals can pass through the wall.
That's why you can now find your home IR/RF remote control --
These remote controls use RF-to-
Infrared converter extending the range of infrared remote control.
In the next section we will discuss the RF extender and other special remote controls