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1.    What is the signal repeater or signal booster? 

In telecommunications, a signal repeater is a device that receives a signal and retransmits it at a higher level or higher power, or onto the other side of an obstruction, so that the signal can cover longer distances. It combines with other possible items for boosting the cell phone reception to the local area by the usage of a reception antenna, a signal amplifier, and an internal rebroadcast antenna. The systems usually use a directional antenna as the donor antenna to pick up the best cellular signal, which is then transmitted to an amplifier unit to amplify the signal, and retransmits it to the indoor antenna, providing significantly improved signal strength. It’s quite a popular device to solve the cellular reception in small and medium sized area, such as home, office, underground parking lot etc.


2.    Why should we use the signal repeaters?

Blind or weak signal areas are formed if the buildings are too far away from CELL TOWER, or the buildings shield or absorb signals.

There are too many complicated signals in the higher part of the buildings, therefore ping-pong switching effect has been formed and the signals fluctuate a lot, there are annoying noises during phone calls and call drops accordingly.

Elevators and basements are well-known for blind areas.

Downtown areas of the cities, which congested with many high-rise buildings, are usually the weak or blind areas.

The remote villages, mountains, hills, valleys, etc. are mostly populated areas with quite few mobile users, so the main target is to send coverage to these areas, and it will not be worthy installing a CELL TOWER, therefore a booster is a quite good option.


3.    Where should we use the signal repeaters?

a.    Rural areas. In many rural areas the housing density is too low to make construction of a new base station commercially viable. In these cases it is unlikely that the service provider will do anything to improve reception, due to the high cost of erecting a new tower. As a result, the only way to obtain strong cell phone signal in these areas is usually to install a home cellular repeater. In flat rural areas the signal is unlikely to suffer from multipath interference, so it will just be heavily attenuated by the distance. In these cases the installation of a cellular repeater will generally massively increase signal strength just due to the amplifier, even with a great distance from the broadcast towers.

b.    Building construction material. Some construction materials rapidly attenuate cell phone signal strength. Older buildings, such as churches, which may use lead in their roofing material, will very effectively block any signal. Any building which has a significant thickness of concrete, or a large amount of metal used in its construction, will attenuate the signal. Concrete floors are often poured onto a metal pan, which completely blocks most radio signals. Some solid foam insulation and some fiberglass insulation used in roofs or exterior walls have foil backing, which can reduce transmittance. Energy efficient windows and metal window screens are also very effective at blocking radio signals. Some materials have peaks in their absorption spectra which massively decrease signal strength.

c.    Building size. Large buildings, such as warehouses, hospitals, and factories, often have no cellular reception further than a few meters from the outside wall. Low signal strength is also often the case in underground areas, such as basements, and in shops and restaurants located towards the centre of shopping malls. This is caused by both the fact that the signal is attenuated heavily as it enters the building and the interference as the signal is reflected by the objects inside the building. For this reason, in these cases, an external antenna is usually desirable.



d.    Multipath interference. Even in urban areas, which usually have strong cellular signals throughout, there are often dead zones caused by destructive interference of waves which have taken different paths (caused by the signal bouncing off buildings etc.). These usually have an area of a few blocks and will usually only affect one of the two frequency ranges used by cell phones. This is because the different wavelengths of the different frequencies interfere destructively at different points.Directional antennas are very helpful at overcoming this since they can be placed at points of constructive interference and aligned so as not to receive the destructive signal. 

e.    Diffraction and general attenuation. The longer wavelengths have the advantage of being able to diffract to a greater degree, so are less reliant on line of sight to obtain a good signal, but still attenuate significantly. Because the frequencies which cell phones use are too high to reflect off the ionosphere as shortwave radio waves do, cell phone waves cannot travel via the ionosphere.


4.    What is repeater distributed system included?

a.    External antenna, also known as donor antenna.

b.    Internal rebroadcast antenna, also known as service antenna.

c.    Signal Repeater, the major part for boosting the signal.

d.    Cables:  LMR 300 or 400, 3D, 5D or 8D - FB coax cables are recommended.

e. Splitters or couplers: when the building structure is too complicated or there is big loss due to thick walls, etc., splitters or couplers shall be used so that more antennas can be installed in more areas to distribute the signals to each corner of the coverage area





5.    Will signal repeaters increase the RF radiation?

No, it will decrease instead. As it can be searched easily through internet, the tower would “order” the mobile phone to increase its output power, in order to ensure successful connection when the mobile signal bar is few, there will be stronger mobile output power level when the mobile signal bar is less and the strongest one can reach 2W (GSM); moreover, the mobile phone is usually as near as less than 5cm to human body when people are in phone calls. Not only it influences the human bodies badly, but also run out of the battery power much more quickly; usually the mobile phone gets hot in such status. 

The maximum power level of 10dBm~30dBm is 0.5W, and it decreases to be maximum 0.05W when reaching server antenna. And since the server antenna is installed over the ceiling or onto the wall, there is usually more than 3 meter away from the human body, 3meter away means at least 40dB propagation loss, or 10000 times less, 0.000005W, and therefore it is too weak to influence human bodies though it is still a very good signal for mobile phones. 

And when a booster is installed, it improves the mobile signals in the coverage, and the successful phone call can be connected easily with a much less power level of the mobile phone, thus it will reduce the RF radiation of the mobile phone tremendously.


6.    How do install the repeater system?

Please contact the sales team with the specific solution, and we shall explain in detail with either oral or written form. There is also detailed user manual of each model, which will show how easy a repeater system is installed.

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