What do I need to receive digital terrestrial tv?

Let's take a look at the general principle of reception of analog and digital tv. Previously, the analog signal we have a normal antenna VHF or UHF bands and he was on his way to a tv, by default, built-in tuner was to convert an analog signal. Next, the converted signal was aired on our television screens.

The principle of reception of digital TV is no different from analog, only with the amendment, that to convert a digital signal tuner is required T T2, that is not in the "old" TVs (but there is not in all LCD TVs). Digital reception scheme therefore looks like this: digital signal antenna the Decimetric (Since T T2 passed exactly in this range), the signal to tuner T T2, which is converted into available type for output on the tv screen and, actually say, is passed to the tv.

Thus, out of all of the above can be done the following output. To receive digital TV you need to have:

1. antenna UHF band;

2. our media receiver with tuner DVB-T2;

3. Tv;

Especially the reception of digital terrestrial television

Let's take a look at the major types and characteristics of television antennas and find out, Why tv signal reception conditions are one of the major factors, affect antenna selection.

How it works? Receiving television antennas are implementing energy transformation of electromagnetic waves in HF-energy, that is transmitted via cable to the antenna amplifier, or directly to a tv or an external digital receiver DVB-T/T2.

Depending on the placement of the antenna can be divided into the following major types of:

Bedroom apartment, designed for installation inside;
Exterior, designed for installation outdoors;
For moving objects, who got more widespread use with the development of digital terrestrial broadcasting.

With the development of digital television alternative to traditional terrestrial antennas amounted Panel type antenna, in plastic case. In addition to the compact construction and modern design, such antennas are characterized by having a built-in amplifier, without which they virtually ineffective.

Antenna with built-in amplifier referred to as active, without the amplifier-passive.

Receiving antennas can also be classified according to the accepted frequency range: For example, band antennas work in one or several ranges, vsevolnovye antennas work with all channels in any of the ranges used by 47 before 862 MHz.

The most important parameters when selecting antennas are:

Operating frequency is the frequency interval, within which there has been a change of power of received signals to no more than twice. Within the operating range of frequencies should be kept all settings made antennas. With the development in Ukraine of digital terrestrial television DVB-T2 most relevant are antenna UHF frequencies 470-862 MHz.

Radiation pattern characterizes the dependence of the ELECTROMOTIVE FORCE (electromotive force), the antenna induced electromagnetic field, its orientation in space. Petal, the corresponding maximum signal or zero in, This is called the main or principal, the rest are called lateral or rear. The main parameter of the directional pattern is the angle of the main lobe in two planes.

Antenna gain shows, How many times the level of navodimogo in her signal exceeds the signal level on the reference antenna. Simple words, the higher gain antennas have, the more effective the, radiation pattern already, above the level of the signal at the output, better signal/noise ratio, as a result, better signal quality and the image on the tv.

Wind load is a parameter, characterizing the amount of bending moment on a mast if exposed to rain. This option depends on the "lateral" antennas and determines the reliability of the antenna. Antenna design must ensure a long-term stability of mechanical design.

When digital tv coverage in our country with a varied terrain is inevitable some losses and, as a result of this, poor reception of television channels. The reason is that, that, in many cases, they arise from the incorrect assessment of the capabilities of the tv reception at all, and in each case. Sometimes this is due to an incorrect choice of antenna, directional and unsuccessful installation. So, owners of televisions are often surprised to find, they have poor picture quality, Although they live relatively close to the tv transmitter.

On radiowave propagation affects humidity, temperature and pressure. The signal is weakened significantly in wet trees, walls of brick and wooden houses. Minimum attenuation of the transmitted signal is observed in winter time.

The modern city is characterized by a significant number of obstacles for propagation. Building, bridges, smokestacks, high-voltage lines and other structures screen and reflected signal. When propagation in such circumstances arise zone shadows and random distribution law of standing wave. It is not surprising, that in one or another area of the city receiving television broadcasts appears unsatisfactory. In urban areas the distance to the transmitter is not a determining factor when choosing a type of antenna. In this case, it is important to take account of the conditions in a particular place reception, such as terrain, construction density, visibility towards the transmitter, as well as the thickness of the walls of the premises and the presence of metal-plastic Windows, metal blinds (If you wish receive television signals in the room antenna).

In rural areas the situation is more favourable for good reception. First of all, When choosing a tv antenna should take into account the distance to the nearest transmitter. The antenna should be positioned at a height as possible and choose the exact direction of the Repeater.