Repeater (from latin re – repeat + translator – carrier, from English repeater – repeater) is radio equipment, the main functional purpose of which is to read / receive a radio signal, amplify the radio frequencies of this signal and transmit the amplified signal further. In other words, this intermediate device repeats or redistributes the received signal. Due to the fact that the repeater increases the signal strength, the signal travels long distances without loss of quality. A repeater is placed between two other networked radio devices to receive a radio signal and transmit an amplified copy of it to a remote receiving point.

Car key repeater (Keyless Repeater) – this is a set of equipment that contains 2 (two) repeaters, the first repeater unit (small unit) receives the request signal from the car and transmits it to the second repeater unit (large unit), which interacts with the original smart key of the car, transmitting to it an exact copy of the request received from the car, the original smart key of the car recognizes the native signal and responds directly to the car, interacting with the central unit of the car alarm / immobilizer. The standard keyless entry system – Keyless Entry / Go, Smart Key, Smart Access, Intelligent Key, Proximity Key, Intelligent Access, Comfort Access or other – recognizes the car’s own smart key and allows you to open the car lock and start the engine. Auto Key Repeater also called repeater wave, repeater long arm, repeater short arm, repeater for hijacking, repeater fishing rod, car repeater, retransmitter, transponder, keyless repeater etc. It depends on the manufacturer of the repeater and its functionality.

A visual diagram of the operation of the auto key repeater (wave repeater, fishing rod, short / long arm, hijacking repeater, multibrand, fbs4, car repeater, retransmitter, transponder, keyless repeater, etc.)

Complete set of auto key repeater (1. Large repeater unit; 2. Small repeater unit; 3. Power adapter; 4. Power cable; 5. Interconnect antenna)

Keyless Go / Keyless Entry / Smart Access / Smart Key / Intelligent Key / Intelligent Access / Proximity Key / Comfort Access etc. – all of these are keyless entry systems. The system data are used to remotely unlock the car using a wireless smart key or an additional immobilizer tag IS-850. Allows you to identify the driver and start the car engine by pressing the start button.
The car owner always carries a smart key or tag with him. When the car owner approaches the car door handle, the modern keyless entry system comes out of standby mode due to the constantly active optical or capacitive on-board proximity sensor. Thereafter, a coded request signal is emitted from several antennas distributed throughout the vehicle. The on-board system switches to the radio signal reception mode in a certain UHF band (for Europe in 433, 434 and 868 MHz, for the USA and Japan, the frequency is 315 MHz) and waits for confirmation from the original smart key of the car. If the key with the correct RFID tag (transponder) is in the range, it receives the signal, decodes it and sends a return signal in the UHF frequency range with a new coding. The control unit in the vehicle receives this return signal, decodes it and compares its own original signal with the signal just received. If the answer is correct, then the system is triggered, if for a certain time the correct answer is not received, the system will switch back to standby mode. When the system is triggered, the user is authorized, the on-board system opens the door handle lock.