What antenna to buy for TV

click fraud protection

Antenna for TV is selected in accordance with what we will catch. Today it is mostly digital multiplexes. The satellite dish is also an antenna. We will catch either from space or from the earth tower. Consider which antenna to buy for TV in the first and second case.

Indoor Antennas for

TV Noise and Signal for

TV People are used to catching long-distance TV towers with outdoor antennas, but time does not stand still. We explain the phrase. The higher is the receiving antenna, the farther it will see the tower. The formulas are given, the portal has already been voiced more than once, by which a specific value is calculated.

Indoor antenna

The world of radio waves is not easy. Radio waves go around the earth( the lower the frequency, the stronger the effect), reflected from the ionosphere and other obstacles. In practice, it is possible to catch the broadcast where there is no direct line of sight. But! Wave reflection and refraction loses some of the energy. Reception becomes extremely weak.

instagram viewer

The world is filled with noises of natural and anthropogenic origin. When igniting, the car emits noise, any star radiates, the Sun is considered to be a treasure trove of noises. How can a signal not get lost on a dirty background? As for analogue broadcasting, there is little chance of catching a signal. And in digital it is customary to impose information on the carrier in an already encrypted form. The process involves the use of pseudo-noise sequences.

Despite the noise, the signal arrives at the receiving point, is compared with the local pattern of the pseudo-noise sequence, and if it coincides, an incredible peak height is obtained, overlapping other waves. Due to the special signal processing technique, digital broadcasting is caught much further. Difficulty is present: to encode a signal with the desired frequency, a carrier, measured in hundreds of MHz, is required. Below is not obtained. Therefore, digital television multiplexes lie in the range above 400 MHz.

TV antenna sensitivity. The difference of digital broadcasting from analogue

Digital broadcasting is well caught, an indisputable advantage - quality! Usually two pseudo-noise sequences are transmitted:

  • zero;

Antenna for

TV The system correctly detects what has come, then decodes the information. As a result, the quality turns out that there is no ether and kilometers. From the point of view of the antenna, digital broadcasting from analog does not differ! In both cases, horizontal polarization is applied( for television), both signals are caught on a single device. But due to special methods, a digital multiplex( channel) carries up to a dozen broadcast programs. Here are the advantages of the new technologies:

  1. Saving of used frequency channels due to the transmission of a number of channels on a single one.
  2. Confident reception with excellent quality.
  3. Ability to protect paid video from unauthorized viewing.
  4. Transmission of other data, for example, about the weather in conjunction with the broadcast programs.

How to choose an indoor antenna

A long introduction is made with care for readers, so that people are not confused with advertising tricks that the antenna for a TV can receive digital broadcasting. There are no others. Any teleantenna suitable for working with horizontal polarization at a given frequency will catch both analogue and digital broadcasting.

In practice, two types are separated by channel numbers:

  • 1 - 12 channel analog;
  • 21 - 69 channel digital.

A small indoor antenna for TV

Frequencies 1 - 5 channel fit into the MW, 6 - 12 - in the UHF, which include digital channels. If the store says that “Antenna catches channels from 1 to 12 and from 21 to 69,” there is an all-band device. It will be possible to watch the First Channel and the digital multiplex. There is an inscription "FM".Radio broadcasts now in the range of 85 - 105 MHz, and in the vertical polarization.

Active or Passive Indoor Antenna for

TV

Formally, digital antennas for televisions are no different from analog ones, broadcasting is only conducted above 400 MHz( UHF, sometimes UHF or the like).The construction is not important, we are not going to interfere with it. Interested in which antenna to buy for TV, passive or active. Why do we need an amplifier at the reception?

Do you remember talking about the noises of the sun and stars? It turns out in semiconductors and metals also induces noise: induced noise, thermal effects. As a result, the sensitivity of any receiver, including a television, is determined by the formula, where two noise components( external noise and internal) are summed. Moreover, the length of the path is taken to the first amplifying device, then the signal in amplitude will turn out to be much more parasitic effects. Readers guessed that by placing the first amplifier close to the antenna, the level of negative factors is reduced to a minimum.

Always take the active antenna, even the indoor version. Plus, feel more about digital television. It will be possible to accept the broadcast much better.

Direction of the antenna for capturing the signal

An antenna pattern

It happens that there are two towers in the district, or due to reflections the signal comes by several rays. This is not too good. Antennas for TV are directional and non-directional. The first ones are good because the interference with other azimuths is automatically cut off, greatly improving reception. If you want to see everything, you have to take a directional antenna. Then the indicated types of antennas for TVs are discarded:

  1. Framework.
  2. Wave channel.
  3. Log-Periodic.

If the latter two groups have one direction, the framework receives from two opposite azimuths. Knowing these small features, it is possible to optimize the reception. For example, if a house stands between two broadcasting towers, take a loop antenna. Note - both stations should be viewed in a straight line. If the window goes to one side, this step will give little.

It is difficult to say which antenna parameters for TVs to prefer in the described case. With undirected often the effect of multipathing occurs, as a result, the image is split. In digital broadcasting, the factor is blocked, therefore, analogue television antennas are designed to have directional properties, for digital it does not matter. But it will be possible to catch more channels, all azimuths are equal. Take for catching digital channels of the antenna with weak or zero directional properties.

An antenna happens in two parts. For example, the framework and antennae. And positioned separately. This allows you to configure the CF and UHF from two independent directions. Conveniently, if the first channel comes from the first side, and digital broadcasting from the second.

Outdoor antennas for

TVs Outdoor antennas are not always placed on the roof, but, as a rule, they detect an amplifier, being considered active. It makes no sense to put a frame on the wall. It is unlikely that the broadcasting rays will come from two sides, strictly parallel to the wall. Place a similar antenna on the roof. If the house stands between two towers - catch both!

As a standard, log-periodic antennas, or wave channels, are installed on the street. There is a single pronounced petal, aims at one station. If there are two towers located at different distances close to the azimuth, try to aim the antenna exactly in the middle, a little further along the corner from the near one.

From what has been said it can be seen:

  1. The main manufacturers of television antennas did their best, there is an option for each case.
  2. Antenna parameters are strongly dependent on the location of the TV towers, the building, the neighboring buildings.
  3. It is always better to take an active antenna. Most are fed directly through the cable through a special electronics unit in the form of an insert.
  4. For digital television, it is not always better to take a directional antenna. The gain is higher, but the wave amplitude is often normal. But non-directional antenna allows you to take a number of rays from different towers.

Finally, a dish is always used to catch satellite broadcasts. Polarization here is not always horizontal. For example, NTV + broadcasts on the circular. The parameters of satellite dishes are selected according to the provider. It is possible to self-direct the plate where required, then buy the right to access paid content. Check out the card-sharing system, when not leaving the taiga, on the Internet it is easy to buy any digital television package. Then you have to choose the parameters.

TV antenna amplifiers are already geographically included in the dish converter, there is no signal of disturbing signal qualityIt is recommended to think in advance about polarization, choose a device from the correct range. Today in the territory of the Russian Federation it is Ku or S.

Why TV does not see HDMI

Why TV does not see HDMITelevisions

The topic of conversation should be called “How to connect the TV to the computer via HDMI”.Most newcomers are doing the wrong procedure, asking questions that are hard to answer professional. Re...

Read More
How to connect the receiver to the TV

How to connect the receiver to the TVTelevisions

Mostly receivers are supplied with two types of outputs: digital, analog. The receiver serves as a repeater for the high-frequency signal in case the antenna cable is single. Briefly consider wha...

Read More
How to connect a laptop to the TV

How to connect a laptop to the TVTelevisions

Consider the interfaces for connecting a laptop to a TV.Two categories of viewers: first, just connect the TV, the second is important to improve the quality of the image. Gamers know that the re...

Read More
Instagram story viewer