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Cable and broadcast television broadcasting systems are developing everywhere every year. However, despite the rapid growth of the network and the expanded capabilities of television equipment, the quality of the image on the TV screen is poor. This is due to the fact that the reception of the TV signal of the antenna depends on various factors: correct installation, design and shape of the device, distance to the repeater. Help improve image quality stand-alone amplifying device or replacing the receiver with a more powerful device. In this review, we will consider how to amplify a weak, unstable TV antenna signal.
What factors affect the deterioration of the television signal
Before studying radio engineering innovations, it is necessary to analyze why the level of functioning of the receiver is low. The causes of interference and poor image quality can be:
- significant removal of the dwelling from the repeater;
- wrong choice of television antenna;
- high level of natural noise;
- external obstacles for signal reception: high-rise buildings, trees, industrial buildings;
- cable failure;
- incorrect orientation of the transmitter;
- the presence of metal objects near the antenna that can conduct electricity;
- distribution of the TV signal to several receivers;
- outdated technology.
Ways to amplify the power of a TV antenna
- Change the location of the antenna. As a rule, it is directed to the side transmitting tower.
- Purchase of an antenna amplifier. They are electrical devices that are connected directly to the antenna and give an impetus to improve the received signal.
- Expand the number of antennas for a clearer image, installed at the highest point.
- Change the device to a more powerful antenna for the TV.
- Remove all objects and metal objectsthat may interfere with TV reception.
- Check the TV cable for integrity. In case of short circuits or breaks, replace it with a new one. For a quality signal, it is important to choose the right cable.
- Create an effect in-phase antenna array (SAR). It consists in the fact that identical receivers make up a complex system that works on a common matched load so that the signal phases are the same.
By knowing how to improve the TV signal, you can minimize screen noise and enjoy high-quality viewing, regardless of the distance to the TV center.
Antenna amplifier
Advantages and disadvantages of antenna amplifiers
Like all electronic devices, devices have their pros and cons. The advantages of antenna amplifiers include:
- due to the operation of the device, even a weak television signal is received;
- minimum noise factor;
- signal improvement in a wide frequency band of several wave bands.
The main disadvantages that users may encounter:
- overload of the device from powerful signals in the MV meter range (49-230 MHz);
- amplifier self-excitation;
- device is susceptible to currents of lightning electric discharges;
- there are passive losses at the output.
How to choose an antenna amplifier
Modern amplifiers have a lot of technical parameters given in the documentation for the device. The trouble is that the user often does not have a sufficient level of knowledge to properly evaluate them. Therefore, it is worth choosing a device according to a number of the most important characteristics.
- Recommended reception range. It can be in the range from 30 to 150 km. Describes the distance between the antenna and broadcasting station at which the amplifier will perform well.
- frequency range. There are broadband amplifiers that work with all broadcast standards. You can buy a device only for DTT or capable of receiving short waves well.
- Gain. It is wrong to assume that the larger this figure, the better. The optimal value is at around 27 dB. Such a device is suitable for a reception range of up to 50 km. More serious models with a gain of about 40 dB will provide a good signal in difficult conditions. But if you put a very powerful amplifier on the antenna, it can trigger the protection of the TV or set-top box, blocking the signal.
- Supply system. Models are offered for direct connection to a 220V socket, with a power supply or a 12V, 5V input. There are products that work only with set-top boxes or TVs powered by a signal cable.
- Case type and execution. The amplifier can be designed for installation on an antenna in outdoor conditions, be protected from water and dust. Or be performed in an indoor enclosure designed to be placed only near the TV.
The optimal solution for DTT would be an amplifier powered by a signal cable. Today, a huge number of set-top boxes offer this option on the connection port.
Advice! If you are using older equipment, it is recommended to buy the amplifier with its own 5V power adapter with signal cable.
Best Amplifiers
The rating of the best includes devices with different purposes of application, type of execution and regular installation site. They do not require complicated setup and show good results in a huge number of cases. Some models allow you to fine-tune the signal characteristics in order to obtain the optimal picture quality on all received channels without exception.
SWA 9001/999/9999/9009/9701 (L) wideband
Cheap and cheerful — this is how you can characterize this amplifier. It doesn’t have any adjustments. The device is simple enough to connect to the antenna, it receives power from the signal cable. Broadband amplifier. It can be installed on both indoor and outdoor antennas. In the latter case, it is necessary to protect the body from precipitation. The device provides a reception range of up to 90-110 km, suitable for the CETV signal.
Pros:
- price tag;
- versatility of application;
- reception range;
- ease of installation.
Minuses:
- offered without protective housing;
- has an uneven gain within the frequency range;
- there is no way to adjust.
RTM LNA02
This product is distinguished not only by an acceptable price, but also by good characteristics.. The amplifier is designed to be connected to set-top boxes with power on the port. Its main advantage is the low level of parasitic noise. It is optimal to use the device in areas of average reception, the maximum gain is 20 dB. The model will show good results to increase the length of cable lines, acting as a signal level stabilization tool. The device is suitable for all types of antennas, installed directly on the F-connector, does not require special settings.
Pros:
- price tag;
- suitable for CETV;
- ease of installation;
- LN (Low Noise) low noise level.
Minuses:
- no settings;
- average gain;
- different KU in separate frequency bands;
- only for set-top boxes with power on the port.
Alcad AI-200
This amplifier is very popular. It is simple and at the same time offers a good level of performance. And most importantly — safety of use. Installed indoors, it does not require special ventilation conditions. The device consumes only 7 W, has two outputs, provides a decimeter wave gain of 24 dB. The device is suitable for receiving the DTT signal. It is completely self-sufficient, it is connected directly to the 220V network.
Pros:
- simplicity;
- safety;
- good CETV gain;
- two exits.
Minuses:
- for indoor installation only;
- 220V socket required;
- The power cable is quite short.
WISI VM 8351
This amplifier is able to save its owner from any problems with the reception of DTTV on an external antenna. The device belongs to the mast type and is designed for installation on the street and work in the most difficult conditions. It is made in a fully sealed metal case. Supplied with its own 24V power supply. The gain is adjustable, from 15 to 35 dB, you can adjust the equipment in accordance with the reception area. The amplifier is connected with F-connectors, it has one input and two outputs.
Pros:
- protected execution;
- full set;
- gain control;
- suitable for CETV.
Minuses:
- only for work with TsETV;
- 220V socket required;
- two functional blocks.
TERRA HA126
Positioned as a brownie, this amplifier will an excellent solution for private housing with a large number of TVs. Or for an apartment where CETV is received on an external antenna. The device generates a high signal level, has a gain of up to 20 dB, and is able to adjust the slope of the frequency response to set the optimal quality on all channels. The frequency response unevenness is only 0.5 dB. The amplifier can operate at temperatures from -20 to 50 degrees, but must be installed indoors. Him low noise figure.
Pros:
- high output level, suitable for a network of several TVs;
- broadband, from 47 to 862 MHz;
- suitable for CETV;
- allows for fine tuning;
- there is a test port for tuning the antenna.
Minuses:
- average basic KU;
- price tag;
- only one exit;
- to connect you need a 220V socket.
Do-it-yourself antenna amplifier
You can design a simple device that amplifies your TV signal for your TV with your own hands. Such a device has low power consumption, does not create significant interference, and has a frequency range of up to 900 MHz. The low-voltage amplifier powered by 2.7-5.5 V consumes 3 mA and is very quiet.
The principle of operation is as follows. Voltage is applied to input «1», which is shown on the microcircuit. Thanks to the resistor R1, a bias is created in the working area. It is connected to input «2». An input signal arrives at output «6», while the amplified signal is removed from node «3» and sent to the receiver. If the chip is properly assembled, there is no need to tune it. By the way, you can also make a TV antenna with your own hands.
Various factors can negatively affect the TV signal level. Modern radio technology devices help to increase it. They have a number of advantages: mobility, high gain and a large selection of models. Thanks to the joint work of the antenna and amplifier, you can watch TV in good quality.
The best TVs of 2020 according to buyers
TV Xiaomi Mi TV 4A 32 T2
TV LG 32LM570B
TV Samsung UE50NU7002U
TV LG 50UM7300
TV SkyLine 32YT5900
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