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A radio remote control (RF Remote Control) is a remote control device that uses radio signals to control various remote institutions. After these signals are received by the remote receiving device, they can instruct or drive various other corresponding mechanical or electronic devices to complete various operations, such as closing the circuit, moving the handle, and turning on the motor, and then these machines can perform the required operations. As a kind of remote control supplemented with infrared remote control, it has been widely used in the field of garage door, electric door, barrier gate remote control, anti-theft alarm, industrial control and wireless smart home.

Commonly used radio remote control systems are generally divided into two parts: transmitting and receiving.

(1) The transmitting part is generally divided into two types, namely the remote control and the transmitting module. The remote control and the remote control module are based on the way of use. The remote control can be used as a whole machine to be used independently, and the external lead wires have wiring pile heads. ; And the remote control module is used as a component in the circuit, and it is applied according to its pin definition. The advantage of using the remote control module is that it can be seamlessly connected with the application circuit, small in size, low in price, and make best use of the material, but the user must Really understand the circuit principle, otherwise it is convenient to use the remote control.

2) Generally speaking, the receiving part is also divided into two types, namely super heterodyne and super regenerative receiving methods. The super regenerative demodulation circuit is also called the super regenerative detection circuit, which is actually a regenerative detection circuit that works under intermittent oscillation. . The superheterodyne demodulation circuit is the same as the superheterodyne radio. It sets a local oscillator circuit to generate an oscillating signal, which is mixed with the received carrier frequency signal to obtain an intermediate frequency (generally 465kHz) signal, which is amplified and amplified by the intermediate frequency. Detect and demodulate the data signal. Since the carrier frequency is fixed, its circuit is simpler than the radio. The superheterodyne receiver is stable, high sensitivity, and relatively good anti-interference ability; the super regenerative receiver is small and cheap.