All TV antennas can be divided into two groups: active and passive, and are more expensive than the second. But they differ not only in cost but also structural features. In the active TV antenna includes a printed circuit Board, the elements of which share of the received frequency into necessary and unnecessary.
Passive receivers, as a rule, consist of vibrators – receivers. In the device using the vibrator occurs the underlying frequency distribution-that is, those elements keep the plates in the "working" frequencies and transmit them to the receiver.
On purpose TV antenna klassificeret stationary antenna of television (antenna for the city and for the house), as well as the interior. Choosing a stationary TV antenna, note that it must be installed on a four-foot distance from the roof. Higher quality signal is transmitted to the stationary antenna of television.
Choose the in-car TV antenna is not easy. Regular TV antenna works conditionally. For best signal reception the antenna should be as high as possible above the surface (it is not necessary to mount in the bumper).
When selecting antenna of television attention should be paid to the parameters of this device. One of them is the operating frequency range. Besides, important figures – the directivity factor (indicates how many times the signal of this antenna of television more reference), the ratio of the traveling wave (alignment of the antenna with the cable), the coefficient of protective action (determines the noise immunity of the antenna).
Another parameter antenna of television – directional diagram. This indicator characterizes the level of the signal issued by the antenna.
In some cases, to improve the quality of the picture will not work. Even after installing a filter, an amplifier or equalizer image quality will not change, so the only way is to use the professional help of a specialist.
The advantage of all-wave antenna – provides good reception of VHF and UHF channels.
Advice 2: How to choose the antenna to give
In the country are engaged not only cultivation of land. To be able to watch your favorite revillas outside the city, pick up the antenna, which can provide them high-quality image.
Pick the type antennna choice is affected by several factors, the main of which are: remoteness from the city's television tower and from the programs that interest you. For good reception of TV signal in the country, use an antenna, which can receive the terrestrial or satellite signal. If the cottage is in the suburbs, the probability of reception of local television is an essential signal. To view a large number of interesting programs will need the satellite signal.
Select the antenna to view local PEREDAChI essential signal has limitations on the distance, and the terrain also affects the image quality. For example, the antenna without the amplifier receives local channels in the plain the distance from the tower to 50 km If the cottage is located on or in the valley, for a good picture should not count. The reception range can be slightly increased if the use of terrestrial antenna with amplifier. Pick up the antenna all-wave reception individually for your area – it will provide high quality reception of all city programs.
Select the satellite the antennaSo as not to depend on city TV towers, stop their attention on a satellite dish antenna. It can help make the variety of channels with high picture quality. Since satellite antennas have different size and design, pick equipment suitable for your structure. To view television in the country don't require professional quality signal, so will fit spherical, offset or flat antenna. Select offset design - it is easily mounted on the wall of the house and easy to set up.
Connect closed Canalys satellite view of many domestic and foreign programs, you can connect to satellite pay TV, installing a special antenna. Through the use of such equipment you will get the chance of reliable reception signal and quality of the image.
Antenna mounting possible on different surfaces: brick, wood, concrete. Select antenna location, most convenient for your structure.
By placing the antenna of broadcast reception on the roof, mount it as high as possible – this will help to improve the quality of the picture.