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radio remote control

Radio remote controls are wireless control systems used in many commercial, industrial and residential applications to control lighting, appliances, electrical outlets, heaters, garage doors and alarm systems

. Wireless remote controls consist of the radio transmitter and the radio receiver. The radio frequencies available are the licence-free ISM bands in the frequency ranges 27 MHz, 40 MHz, 433 MHz and 868 MHz. For the control signals transmitted by the handheld transmitter, there are different modulation methods and coding methods that are used for specific applications. Amplitude modulation and frequency mod

ulationare used

asmodulation techniques.

Linear coding with 12 bits or 18 bits, rolling code, alternating

code,hopping code and other codes

are used as coding methods.The coded radio signals are transmitted via the corresponding ISM frequencies and demodulated and decoded by the radio receivers. Handheld transmitters can have several channels and trigger different functions via them. The radio transmission is then time- or frequency-shifted using multiplex technology

.

Hand-held transmitter for 433 MHz for garage door opener, Photo: Schartec

Hand-held transmitter for 433 MHz for garage door opener, Photo: Schartec

Due to the possibilities for the selection of the frequency range, the modulation technique, the coding method, the multiplex technique or the control options, there are a large number of radio remote control systems. Many of the systems are incompatible with each other.

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Englisch: radio remote control
Updated at: 15.01.2021
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