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Despite the fact that the number of channels,accepted antennas, is limited, the popularity of these designs is at a high level. This is due to the fact that the devices combine such attractive qualities as low cost, lack of user fees for use, ease of installation.

The design, the principle of the ether antenna

For normal reception of TV channels on the antennaThe TV input should have a voltage in the range of 320-500 μV. To achieve this, the antenna must have a certain design. At the heart of each ether antenna is the main element - a half-wave vibrator, which can be looped, linear cut and linear continuous. Regardless of the design, the vibrator has an eight-directional pattern located in the plane of the antenna, so the highest signal level is toward the main lobe of the terrestrial antenna. Another element of the antenna - most often a rod located in front of a half-wave vibrator. Behind him is a reflector, most often a rod, but of a large size. A number of passive vibrators are also attached to the common bar. The material of the antenna is usually aluminum or anti-corrosion alloys.

Types of antennas

The simplest version is the frame antennas. These are devices that do not require any settings. Sometimes, to increase the gain, the antenna is made in the form of several frames connected together. No less common is the construction of the "dipole" type, which can be wave, half-wave or quarter-wave. Here the length of the vibrators corresponds to the wavelength or makes up ½, ¼ of it. The lattice (or in-phase) devices, which are a system consisting of several small antennas, are more complex in design. The structure consists of several gratings located on one rod. These devices include "Polish" antennas, whose popularity is due to the ability to receive the weakest signals due to the presence of a built-in amplifier. Several "apart" are log-periodic antennas belonging to the category of broadband satellite devices. These devices are able to receive signals directly on several channels in a wide range of frequencies: for low frequencies, the "largest" vibrator "answers", for high frequencies it is the smallest. Another type of antenna, such as "traveling wave", is characterized by a high level of directivity, because The wave of the incoming signal passes along the geometric axis. This device is considered ideal for making satellite internet.