Cellular repeater - a device designed to expand the coverage of a signal and provide a stable signal in places where it is poorly captured or completely absent. Often, instead of the word “repeater”, synonyms are used: cellular amplifier, GSM repeater, GSM amplifier, cellular amplifier.
Kinds of repeaters
Single-band wideband repeaters are the most common and cheapest devices designed to work in the entire frequency band of one standard. Such repeaters amplify the signals of all mobile operators simultaneously broadcasting in the frequency band of one band, for example: 2G 900 MHz or 3G 2000 MHz.
Single-bandband repeaters are designed to support only one mobile operator and work only in one band.
Multidiapone repeaters work simultaneously in several standards (for example, 2G / 3G or 2G / 3G / 4G) and allow you to provide stable voice communication and access to high-speed Internet.
Line amplifiers (boosters or additional amplifiers) - repeaters with low sensitivity. They are used only in conjunction with repeaters and can increase the output signal power after the repeater several times. Sharing a repeater and booster is usually cheaper than buying one expensive repeater of high power.
Gain (KU), measured in decibels. Repeaters with high KU are able to work with a lower input signal. If the distance from the object on which the repeater is installed to the operator’s base station is less than 5 km, you can choose a repeater with a KU 50 - 70 dB. With a distance of 5 to 15 km, it is recommended to choose a repeater with a KU 70 - 80 dB. If the object is located from the base stations of cellular operators for a distance of more than 15 km, a repeater with an AC of more than 80 dB is required.
On low-power models of repeaters, the coefficient value is fixed and not adjustable. In repeaters of medium and high power manufacturers provide the ability to adjust the KU.
The greater the power of the repeater, the more coverage it can provide. Accordingly, the larger the object, the larger the repeater output power needed. When choosing a repeater, it is necessary to take into account the material of the walls and floors, the configuration of the premises, the presence of cellular communication signals at the facility and the location of the base stations relative to the facility.
Almost all manufacturers of communication amplifiers in the specifications for each model of the repeater indicated the maximum coverage area, for example, up to 1500 square meters. This value represents the maximum possible service area of the repeater in the absence of any obstacles for signal propagation. To determine the actual coverage area, it is necessary to divide the value of this parameter by 3, and if it is necessary to have some power reserve, then by 5.