How to amplify the signal of the TV antenna with your own hands
Cable and broadcast television systems are evolving everywhere every year. However, despite the rapid growth of the network and the expanded capabilities of television equipment, the picture quality on TVs is poor. This is due to the fact, that the reception of the TV antenna signal depends on various factors: correct installation, design and shape of the device, distance to the repeater. To improve the quality of the resulting image will help stand-alone amplifier or replace 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 TV signal
First, than to study radio engineering novelties, need to be analyzed, why the level of operation of the receiver is low. Causes of noise and poor image quality can be the cause:
- significant distance of housing from the repeater;
- wrong choice of TV antenna;
- high level of natural noise;
- external interference to signal reception: high-rise buildings, wood, industrial buildings;
- cable failure;
- wrong transmitter orientation;
- the presence of metal objects near the antenna, capable of conducting electricity;
- division of the TV signal into several receivers;
- outdated technology.
Ways to increase the power of the antenna
- Change the location of the antenna. Usually, it is directed towards the transmission tower.
- Purchase an antenna amplifier. They are electrical devices, which connect directly to the antenna and give a boost to signal improvement.
- Expand the number of antennas for a clearer image, installed at the highest point.
- Replace the device with a more powerful TV antenna.
- Remove all objects and metal objects, which may interfere with the reception of the TV signal.
- Check the integrity of the TV cable. In case of short circuits or breaks, replace it with a new one. It is important to choose the right cable for a good signal.
- Create the effect of in-phase lattice antenna (SAR). It is, that identical receivers make up a complex system, which works on a joint agreed load so, so that the phases of the signal are the same.
Knowing, how to improve tv signal, you can minimize image noise on the screen and enjoy quality viewing regardless of the distance to the TV center.
Amplifier for the antenna
Advantages and disadvantages of antenna amplifiers
Like all radio devices, devices have their pros and cons. The advantages of antenna amplifiers include:
- due to the operation of the device receives even a weak television signal;
- minimum noise figure;
- improving the signal in the wide frequency band of several wavebands.
The main disadvantages, that users may encounter:
- overload of the device from powerful signals in the meter range of MB (49-230 MHz);
- self-excitation of the amplifier;
- the device is susceptible to lightning currents;
- passive losses occur at the output.
Antenna amplifier with your own hands
You can design a simple device, which amplifies its TV signal for the TV with its own hands. Such a device has low energy consumption, does not create significant obstacles, and has a frequency range up to 900 MHz. Low voltage power amplifier 2,7-5,5 In consumes current in 3 mA, works very quietly.
The principle of operation is as follows. At the entrance "1", which is shown on the chip, voltage is applied. Thanks to the resistor R1 creates a shift in the working area. It is connected to the input "2". At the output "6" comes the input signal, while the amplified is removed from the node "3" and goes to the receiver. If the chip is properly assembled, no need to configure it. By the way, you can also make your own TV antenna.
How to choose an antenna amplifier
To choose the right antenna amplifier, pay attention to the following parameters.
- Distance from the repeater. This figure should be within 10-150 km.
- Frequency range.
- The signal level at the output of the device. The best option - 100 dB per microvolt.
- The gain of the device. This figure must be at least 40 dB.
- Device type, for which it is necessary to amplify the TV signal.
- Noise factor. It is recommended not to exceed this parameter more 3 dB.
- Current consumption. The optimal value is considered 30-60 mA.
- Location: on the receiver or near the device.
pay attention! For digital television it is better to have a device with an indicator of the supply voltage 5 V. If you select a DVD-T2 set-top box with this setting, you do not need to buy a power supply for the antenna amplifier.
Popular amplifiers
Various amplifiers are sold on the market for radio devices to improve the image quality. You can adjust the gain in the devices. Most devices have multiple outputs to connect to multiple TVs.
Models for amplifying the television signal
- Televes 5523. The Italian company has introduced an improved device from 5 outputs. Due to the high gain in 16 dB radio device reduces the level of persistent noise, television interference. The device works from a separate power supply, which is included in the package of the device.
- Terra HA123. The device guarantees stable signal reception in a country or multi-storey building. Device with a gain of 28 dB works efficiently at different frequencies. The compact device of the Lithuanian company weighs 600 G. Noise factor up to 30 dB.
Models for amplification of terrestrial and satellite signals
- Last A05-02. The device increases the signal level to 19-21 dB. Operating frequency bands for satellite TV within 950-2400 MHz, essential - 5-950 MHz. Power to the Gecen A05-02 broadband amplifier comes via a coaxial cable from a satellite receiver (read more about installing satellite TV). To get an amplified terrestrial TV signal, an additional power supply is purchased.
- Polish amplifiers of the SWA series. They are mounted mainly on the "lattice" of antennas and have different gain. The frequency range varies from 49 to 790 megahertz. The supply voltage is 9 volt. Installation is carried out by means of hairpins or threaded connection.
Various factors can negatively affect the level of the TV signal. Modern radio-technological 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 the amplifier, you can watch TV in good quality.
