We have long been unable to imagine our lives without our favorite TV shows and movies. Therefore, television in the apartment of the modern man is the main gadget. To access television in the country (for example, in the country house) requires a satellite dish. This unit is designed to watch a wide range of TV channels in digital and HD quality. There are also conventional TV antennas that receive and broadcast over-the-air digital TV. However, sometimes the signal power is not enough and the image on the TV screen is broadcast with interference.
Contents
- 1 What factors influence the deterioration of TV signal
- 2 What is an antenna amplifier?
- 3 Classification of TV amplifiers
- 4 Models for amplifying analog signal
- 5 Models to amplify terrestrial and satellite signals
- 6 How to Amplify Your Indoor Antenna
- 7 How to choose an antenna amplifier
- 8 How to connect the amplifier to the antenna
- 9 Advantages and disadvantages of antenna amplifiers
- 10 Review of popular models
What factors affect the deterioration of the TV signal
Causes of interference in the broadcast can be different. The most common ones are:
- The distance of the TV from the repeater;
- Unsuitable television antenna;
- A large amount of noise in the radius of the antenna;
- physical obstacles to signal transmission (high-rise buildings, trees, industrial buildings);
- bad condition of the cable;
- Improper orientation of transmitter;
- Metal structures near the antenna;
- signal distribution to multiple receivers;
- Outdated equipment.
What is an antenna amplifier?
Antenna amplifiers are devices that enhance the quality of a TV or radio signal and reduce all kinds of interference. They increase the range of the signal, bringing the broadcast "picture" to the maximum quality. Amplifiers are necessary for residents of both suburbs and metropolitan areas: for example, when the TV tower is at a distance or there are many high-rise buildings around the house that create obstacles.
TIP: Due to the shape and design of the antenna, it receives a clearer signal from one, maximum - two directions.
Classification of TV Amplifiers
Amplifiers are divided into types:
- Mast Amplifiers. Those that are mounted on the mast itself. By coaxial cable power is routed to them. But that is why such amplifiers do not last long, they can fail during a thunderstorm and lose quality because of the oxidation of the contacts. Mast amplifiers usually last a couple of years.
- Internal Amplifiers. These are more convenient because they are close to the receiver. True, signal loss still occurs through the cable.
Antenna amplifiers are also divided into subtypes:
- Range. SWA and LSA devices, which are necessary when installing array antennas.
- Multiband. ALCAD and TERRA type devices that work for near and far reception. They are capable of picking up several signals from different sources simultaneously and stacking them into one.
In addition, all antenna amplifiers come with their own power supply. They also come in different versions: adjustable and non-adjustable with external or internal design.
Models for enhancing analog signal
Modern radio technology devices can solve the problem of poor quality "picture" on the screen of your TV. Such devices have many advantages and allow you to eliminate interference with your own hands. It is important to make the right choice by combining the work of the antenna and amplifier.
- Televes 5523.
Manufacturer from Italy, which provides amplifiers for five outputs. In addition, it has a fairly high amplifier factor - 16 dB, which significantly reduces noise and interference. The device functions through a separate power supply.
- Terra HA123.
This model is great for country houses or high-rise buildings, as it boosts the signal to a factor of 28 dB and works on a variety of frequencies.
Models for amplifying terrestrial and satellite signals
- Gecen A05-20.
This amplifier raises the signal ratio to 19-21 dB. It works in the frequency range for satellite TV broadcasts 950-2400 MHz, terrestrial - 5-950 MHz. However, you may need a separate power supply for greater effect.
- Polish SWA series amplifiers.
These models are attached to the "trellis" antennas and amplify the signal frequency in the range from 49 to 790 MHz.
They are mounted mainly on the "trellis" antennas and have different amplifying coefficients. The frequency range varies from 49 to 790 megahertz. The supply voltage is 9 volts. Mounting is done with a stud or threaded connection.
How to amplify a room antenna
A few tips to help you get a clear picture on the TV screen:
- Re-position the antenna and point it in the direction of the TV tower;
- Supplement the antenna with an amplifier signal;
- Increase the number of antennas and install them at the highest possible height;
- Replace the TV antenna with a stronger one;
- Remove any metal objects that interfere with the signal reception;
- Check the cable for breaks, etc;
- Create in-phase antenna array effect (ATS).
How to choose an antenna amplifier
Choosing an antenna amplifier affects the entire performance of the antenna, so vigilance and some knowledge is also required here. When choosing a device, it is important to consider a number of factors:
- Frequency range.
- The distance from the amplifier to the repeater should range from 10 to 150 km.
- The signal level at the output of the device should be about 100 dB per microvolt.
- The gain of the device should be at least 40 dB.
- It is important to know the type of device receiving the TV signal.
- The noise figure should not exceed 3 dB.
- Current consumption is preferably within 30-60 mA.
- Location of the amplifier and its distance from the TV set.
Connecting the amplifier to the antenna
An antenna amplifier is a small-sized electrical circuit. If the antenna is already connected, the necessary device is attached to its mast between the matching device and the feeder with a few bolts. If you do not have special equipment, then to check the effect of the work done just turn on the TV. If the antenna is still not installed, it will be faster and more effective to call a master.
Advantages and disadvantages of antenna amplifiers
Taking care of the quality of your future leisure time, it is also important to think about whether this or that unit is suitable for you. Alas, antenna amplifiers are not suitable for everyone. Our review of the pros and cons of the appliance will help address this question:
Pros:
- Signal amplification and as a consequence a quality "picture" on the screen;
- Minimization of noise;
- Increasing the frequency range.
Cons:
- possible signal overload (regulators may be necessary);
- dependence on weather conditions (e.g. lightning can damage the amplifier);
- probability of self-excitation.
Overview of popular models
There are many models of antenna amplifiers on the market: some are popular because of the price, others take the ease of installation. Here are a few popular models:
- Delta.
One of the most popular Russian manufacturers of amplifiers, which also deals with active antennas. Most often buy models Delta 3311 A (rugged outdoor version), Delta K 331 A (suitable for broadcasting regional TV), Delta K 331 A.03 (indoor device with telescopic tendrils).
- SWA.
This type of amplifier is suitable for Polish (trellis) type antennas.
Its range varies from 49 MHz to 790 MHz. It is advised to buy equipment of a narrower range to avoid unnecessary noise.
WARNING: There are a lot of SWA models, so pay attention to the features that are right for you when choosing.
- Locus
The LSA amplifier is suitable for this antenna manufacturer. It is able to resume its activity and raise the efficiency of the signal.
- Alkad
This model has two to four outputs, to which you can connect several TVs. You can also adjust the gain here.
- Terra
A Lithuanian manufacturer, whose amplifiers can stack the signals of several antennas, that is, they have more than one input.
To summarize, let us remind you that when choosing an antenna amplifier you should be guided by many factors, but it is quite possible to cope with the task without the help of a professional. Also, you can, of course, make such a device with your own hands, but if you are not confident, it is better to go to a specialized store, because any foreign mechanisms themselves are sources of noise and interference - it is better to reduce them to a minimum.
Related articles:
