Antennas for TVs are known almost from the very beginning of the history of television, because without an antenna the TV does not catch a signal. Previously, people used indoor or outdoor devices connected to the "box" wire. This analog technology for catching signals from a nearby television tower exists today. At the same time, the number of channels is very limited, and the quality of the image often leaves much to be desired.
To solve these problems, people eventually created satellite TV. In this case, it is no longer analog, but the digital signal passes not through the TV tower, but through satellites flying in outer space. This has become an expensive pleasure, not available to everyone.
Further progress did not stand still, and a more sophisticated television system was created - digital. It includes several methods of data transfer:
- through the TV tower (terrestrial);
- through the cable (cable digital TV);
- through satellite;
- by connecting to the Internet through special devices (IP-TV).
Each of them gives access to hundreds of domestic and foreign TV channels in excellent quality.
Satellite dish for TV
If before, the satellite dish was a luxury and we enviously watched "plates" on the houses of wealthy people, today there was a tangible decrease in their cost, as a result of which satellite television became more accessible.
A good satellite dish for a TV catches a huge number of channels. The signal quality is excellent. It can only be reduced by prolonged precipitation in the form of rain or snow.
Digital antenna for TV
As already mentioned above, there are several options for digital television , respectively, for each of them there is a kind of antenna. How to choose an antenna for a TV, when the choice is quite extensive? You can classify them by several parameters. So, in the place of installation it can be:
- indoor antennas;
- outdoor antennas.
Room, as is clear from the name, are installed indoors in the so-called safe reception areas. In villages and suburban holiday villages, it is not worth waiting for such high-quality images from such antennas. To improve the picture quality, it is preferable to use room antennas with an amplifier for the TV.
Outdoor antennas are much better in their parameters and can be used almost everywhere. It is more difficult to install such an antenna, and some experience is needed, but the effect is worth the effort.
By the type of signal amplification, the antennas are divided into:
- passive;
- active.
Passive antennas receive and amplify the signal due to their geometric shape. At the same time, they do not have active amplification elements - neither transistors nor microchips. Due to this, such antennas do not introduce any additional noise or noise into the received signal, which invariably accompany electronic components. However, they can not always guarantee a high-quality reception due to limited own capabilities.
Active antennas amplify the received signal not only due to its shape, but also with the built-in or separately located electronic amplifier. It feeds such an antenna from the mains. It is a source of interference and noise in some situations: when in a zone without a sure reception, if the amplifier has excessive amplification or the amplifier is produced by an unknown manufacturer, that is, it has poor quality.
According to the received frequencies, digital antennas are:
- channel;
- banded;
- all-wave.
Channel channels receive only separate frequency channels and are not used by ordinary viewers, but rather in special cases.
Range antennas are used in cases when it is necessary to take only MB (meter waves) or only DMW (decimeter waves) ranges. So in Russia only the DMV-range is applied, and the antenna working in this range is quite enough.
All-wave antennas simultaneously accept both ranges. Most often, TV viewers buy just such antennas, because they want to catch the channels, broadcast in the MV and DMV-bands.