Signal amplifiers for mobile phones

Despite your data plan 4G, it happens that your calls are dropped, websites take a long time to load or the Internet freezes during a video conference. This can happen at home or in an office, in the countryside or in a city centre. If these kinds of problems occur regularly, a mobile signal booster could be the solution. In our article you will find detailed information about how a mobile amplifier works, its installation, advantages and disadvantages.

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What is a mobile signal booster?

A mobile signal booster is also called a repeater or an amplifier. But regardless of the name of the device, the principle of its operation is as follows. The booster picks up the cellular signal from the nearest base station and amplifies it, transmitting an enhanced signal to cell phones within the system's coverage area, so you get better mobile phone reception.

Often, when we talk about a booster, we mean exactly a box in which the signal is amplified. However, the repeater is made up of several elements:

  • an outdoor antenna
  • an amplifier box
  • an indoor antenna.

A standard kit also includes coaxial cables and mounting accessories.

Let's talk about these components in detail.

The outdoor antenna is placed outside the building. Take into account that its work supposes the amplification of the already existing signal. If there is no network coverage, the amplifier will not be able to boost the non-existing signal.

The main types of outdoor antennas are directional and omnidirectional antenna. The omnidirectional antenna is recommended in cities where the signal is strong and comes from several directions, and there are many cell towers. In less populated areas, it is better to install a directional antenna. Being directed towards a cell tower, it picks up weak signals even over long distances.

The amplifier box is installed inside and connected to the two antennas by coaxial cables. This is where the signal is boosted. The amplifier box determines the characteristics of the enhanced signal (frequency, strength, extent).

The indoor antenna distributes the signal sent by the amplifier box. The area over which the antenna can transmit the enhanced signal is the coverage area of the amplifier.

Thus, the mobile signal booster allows you to improve the cellular network where the connection is poor.


How to choose a good signal booster

Boosters increase the signal of any type: GSM, 3G, 4G and 5G. But an incorrectly chosen and tuned amplifier will not help you, and at worst it will even reduce the quality of the signal. Therefore, it is necessary to carefully choose and install this device, and we are always ready to help you.

To make a good choice, you must take into account many parameters. First of all, it is important to know the frequency bands used by your operator, which differ depending on whether the device is connected to a 2G, 3G, 4G or 5G network.

Today in the United Kingdom, the following band frequencies are used: 700 MHz, 800 MHz, 900 MHz, 1400 MHz, 1800 MHz, 2100 MHz, 2600 MHz, 3400 MHz, 3600-4000 MHz. The situation is complicated by the fact that the same mobile network can be distributed at several frequencies:

  • 900 and 1800 MHz for 2G
  • 900 and 2100 MHz for 3G
  • 700, 800, 900, 1800, 1400, 2100 and 2600 MHz for 4G
  • 700, 3400, 3600-4000 MHz for 5G.

There are specialized sites to know the location of cell towers and the frequencies used by these towers. For example, you can go to CellMapper.net or AntennaSearch.com. There are also mobile apps which can help you with the information about base stations. These are, for instance, OpenSignal or Cell TowerRadar.

Why is it so important to know your operator's frequency band? Mobile signal boosters are designed in such a way that they pick up a single frequency band. For example, a 2600 MHz booster will only boost 4G. But don't worry if you need to enhance more than one signal type or frequency band. Some network boosters can receive two or more bands. It is therefore important to know these frequencies before choosing an amplifier.

It is also important to determine the area covered by the booster, as this area can differ depending on the model and vary from small surfaces to 3000 m².


Installing a mobile signal amplifier

The installation of a signal amplifier does not require any special technical knowledge. The outdoor antenna is placed outside the building, preferably high up on the roof of the house or at another location where the signal reception is strong enough. There is a direct relationship between the height of the antenna installation and the result - the higher the antenna, the better the final result. But don't raise the antenna too high, especially when such an elevation will make it the highest point around - the antenna will become a lightning rod.

Signal amplifiers for mobile phones

As we have already said, outdoor antennas are generally divided into two categories: omnidirectional and directional. An omnidirectional antenna picks up the signal from all directions, while a directional one transmits or receives a signal exclusively in one direction.

The cables from the outdoor and indoor antennas should be connected to the amplifier box, and the power cable should also be connected to the amplifier. Avoid twisting the cables for better reception.

When choosing the location of the indoor antenna, consider the following points:

  • On the signal path should be as few obstacles as possible, so it is best to install the indoor antenna above human height and ideally in the middle of the wall.
  • The indoor antenna must point in the opposite direction to the outdoor antenna.
  • Try to avoid directing the indoor antenna towards the outdoor antenna cable so that interference is not created.
  • For the proper amplifier work, avoid placing the two antennas too close to each other (preferably at least 3 metres apart).

Once the amplifier is installed and the outdoor and indoor antennas are properly connected to the amplifier box with coaxial cables, you can switch the device on.


How to know a real signal strength of your mobile phone

When installing the outdoor antenna, you need to find a place with the strongest signal. We are all used to determining the signal strength of our mobile phone by using the bars we see on the screen. But that's not quite right. The actual signal strength of your smartphone is measured in dBm, or decibels milliwatts. dBm is expressed as a negative number, for example, -79. The closer the value is to zero, the stronger the mobile phone's signal. Thus, -79 dBm is a stronger signal than -88 dBm.

To find out the signal strength on the Android phone, go to "Settings" → "About Phone" → "Status" or "Network" and you will see the signal strength in dBm.

On iOS the process is as follows:

  • Dial *3001#12345# to enter the "Field Test Mode".
  • In this mode, simply click where the network bars normally appear and they will be replaced with their numerical value.

There are also many apps that will help you check the signal strength on your Android or iOS device: Network Cell Info Lite, Cellular-Z, OpenSignal, Speedtest.


The advantages and disadvantages of mobile signal boosters

The main and obvious advantage of a signal booster is that it amplifies a weak mobile signal, creating stable coverage in the area of its functioning. Moreover, this reduces the radiation from mobile phones, as the phone no longer needs to seek for the network. Compare: the maximum radiation of the smartphone is 250 mWatts, the maximum radiation of the amplifier is 10 mWatts. For the same reason, when the repeater is working, phone consumes less battery.

Another clear advantage is that the booster improves the reception of all phones in the area of its coverage, regardless of the operator. The only requirement is that the frequency of the repeater matches the frequency used by your carrier.

The disadvantages of an amplifier are as follows. Choosing a booster requires information about the frequencies used by your operator. Installation can be difficult. The price of a good repeater starts at £150, and the market is flooded with cheap amplifiers of unknown quality, which can be hazardous to your health.


Our top 5 signal boosters

And now to illustrate all that has been said above, here are our top 5 network repeaters with their key features.

Top 5 Mobile Signal Boosters
Mobile signal boosterFrequency bandsCoverage areaFeatures
Nikrans BD-300GDW900MHz, 1800MHz, 2100MHz300 m²two indoor antennas; lightning protection; LCD screen
Nikrans NS-300-Smart800MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz300 m²lightning protection; LCD screen; detection of isolation between antennas; automatic gain control (AGC); manual gain control (MGC); standby mode
Nikrans LCD250-GSM+4G PROthe model is available in two versions:
900 + 800 + 2600 MHz or 900 + 800 + 1800 MHz
250 m²LCD screen; automatic gain control (AGC); standby mode
Nikrans LCD250-GSM+4Gthe model is available in two versions:
900 MHz + 2600 MHz or 900 MHz + 800 MHz
250 m²lightning protection; two indoor antennas; LCD screen; automatic gain control (AGC); standby mode
Nikrans NS-300-Multi800MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz300 m²lightning protection; LCD screen; automatic gain control (AGC); manual gain control (MGC); function of automatic booster deactivation in case of unpredictable errors