Digital coding of a television signal allows you to deliver it to the receiver, minimizing any loss. TV to support technology, you need an antenna for DVB-T2. Do it yourself make such a device much cheaper than buying ready, paying for him about 3 thousand rubles. Essential digital television displaces all similar types of signal transmission, while offering high-quality broadcasting and variety of channels.
Changes in the air
Make an antenna for a lamp TV of an old sample was considered prestigious and showed the level of skill, in the modern world, interest in homemade devices does not fade, and many make the Essential antennas DVB-T2 with their own hands. Manufacturers of industrial equipment adapt to the changed conditions of reception in that they connect modern electronics to standard known designs, not paying attention to the fact that the main condition for the operation of the antenna is its interaction with the ethereal.
In recent years, almost all broadcasting occurs in the DVB-T2 range, which reduces the cost and simplifies, from an economic point of view, the antenna feeder of the transfer stations. For periodic maintenance requires less highly qualified personnel, its work becomes less harmful and dangerous.
Television broadcast transmitters are covered with signals all major cities and small towns, so catching the waves from non-serviced low-power stations in a deaf terrain becomes relevant if an antenna is installed for receiving a DVB-T2, with your hands made of girlfriend.
Due to the extended construction of reinforced concrete buildings, the conditions for the propagation of signals in settlements significantly changed significantly. Multi-storey houses with a metal frame are peculiar mirrors, several times reflective waves up to full attenuation.
In modern air, many TV channels are broadcast. The digital signal is different from the rest of the fact that it is or there or it is not there, the middle position is not given. Other transmission systems are distinguished by the fact that the channels perceive interference in different ways, which is why their broadcast quality decreases, sometimes the image may simply disappear. Antenna for DVB-T2, with your own hands made, will allow you to take the same signal for all channels that show the same high-quality picture.
The digital broadcast signal is special that there is no interference, if it is a half of the decibel exceeds noise, then a good reception is carried out. On the disappearance of the signal affects the inconsistency with the cable or distortion of the phase on any section of the transmission from the camera to the tuner, while the image may crumble into small parts even at a strong signal.
Basic features for the manufacture of antenna
Before the DVB-T2 with their own hands, the principle of its action should be studied.
To capture the digital signal you need to be very easy to design even from a simple cable, producing the right calculation.
The theory says that digital signals are easily broadcast in the decimeter range and can be accepted by any type of antenna, but it really does not always work.
It is possible to make a television antenna with minimal costs and without the help of outsiders, but it should be remembered that the obtained device for the quality of reception is inferior to professional instruments.
Requirements for antennas
New conditions for broadcasting, distribution and reception on the air changed the basic requirements that the TV antennas must match with their own hands. DVB-T2 has canceled previously significant directional and protective coefficients. They do not matter in modern devices, as the ether is polluted, and it is possible to fight even with small penetrating interference with electronics tools. At the same time, an important role is played by the coefficient of own amplification of the antenna (KU).
Antenna, well-leaky ether, has a power supply for the received signal, which allows the electronics to sift it from interference and noise. Modern antenna for DVB-T2, with his own hands made, retains electrical indicators with a natural way, and does not adapt to acceptable parameters using engineering techniques. It is agreed on the entire operating frequency range without the use of symmetrization devices.
Characteristics of amplitude and antenna frequency
Antenna is done as smoother, phase distortions arise due to a sharp nature and failures. Single-frequency antennas stretch in an acceptable attitude of noise to the signal, thus, put them on receiving up to 40 channels. But they are additionally installed coordination amplifiers, which absorb waves or distort the phase indicators.
The most efficient DVB-T2 digital antenna is made:
- frequently dependent - with low indicators, but cheap and easy to manufacture, designed in a short period of time, intended for receiving in a relatively clean air at a short distance from the transmitted station;
- the periodic range, capturing all the waves in the spacious, ideally sorting them, which is characterized by a simple design, perfectly works in a pair with freeder on the entire reception length.
If we talk about the design, then the simplest DVB-T2 antenna is made in your own hands in the Eight of the Eight, Polish and Square.
Antenna by the type "Eight"
Refers to easily constructed devices made by the type of standard eight, which removed the reflector. The ideal material is but an aluminum strip, a corner, tube, tire, another profile applies. The upper size is 140 mm, the side part in length is 130 mm, but these dimensions are given for a reference point, in the manufacture should not withstand them accurately up to a millimeter.
To begin with, it is cut off with a wire with a length of 112 cm, begin to be bent the first part with a length of 140 mm, of which 130 mm goes to the antenna, and 10 mm remain for the loop. The next two parts are bended equally for a length of 140 mm, the next two - 130 mm, the next pair of 140 mm, then another 140 mm, then 130 mm and make the second loop. The compounds are preliminarily cleaned, connected and soldered, they are the contacts for fastening cable veins.
Cleaning cable and plug are performed using a scalpel and nadfil. After soldering, the connection is sealed and fastened with glue from the hot pistol. If we talk about the plug, the glue is poured into the adhesive connection, then the cavity of the cap, the excess is then removed. The joke is going so quickly so that the adhesive mass does not occur. It turns out an eternal strong and elastic connection. To contact the ends of the cable we clean on the side of the plug by 1 cm, from the antenna side - by 2 cm.
Room digital DVB-T2 antenna with its own hands when connecting the soldering is also sealed with glue, where at the point of contact is recommended to install a hard frame for the size of the joint. If the device is done for yourself and will be rigidly fixed during operation, and you do not need a transfer, then the frame does not. The device made by this type easily captures the digital signals on a straight line of visibility of the television tower at a distance of up to 10 km at an external installation.
Using the "Polish" antenna
The Polish Antenna received its name during the former union as a reliable device for receiving signals of Soviet television, as well as channels in the decimeter range. The reception of digital broadcasting on it is practically not carried out due to small efficiency. Some amateurs are trying to bring the design to the ideal due to shortening long decimeter mustache and removal of the reflector. Such a change in some cases allows you to adjust the image in a digital format, but it is impossible to talk about the guaranteed obtaining a reliable result. Speaking of Polish devices, you can mark the quality work of the amplifier, which works efficiently with a digital signal.
Type of antenna "Square"
Such a room antenna DVB-T2, with its own hands, is a modified copy of a standard design, known as "Three Square", in which there are six components and a coordination transformer is provided. The homemade antenna of this type confidently copes with the reception of digital format TV channels at a distance of up to 10 km in a straight line, for longer distances, a signal amplifier is required.
The design of the antenna is easy to execute. The main structural element consists of aluminum wire of round-section and single-core wires. Wire bend to obtain six squares and make a consigning discharge, which is a high frequency transformer, to combine the signal cable and DVB-T2 antenna with an amplifier. Do with your own hands perform the switching of the wires to the points, restructure them with wire from copper and the soldering iron lud.
The cable to the antenna is attached by special clamps or using an ordinary insulating tape. The attachment of the cable is carried out with the support of the support, use a wooden bar or other material. When installing indoors or outside the structure, the main condition is the exact setting on the television tower. This is done using the navigator if there is no direct visibility, the direction is specified to the effect of producing a powerful signal.
Antenna device from beer cans
The technology of manufacturing such an effective antenna is very simple and does not require special skills.
With the help of thick sewn or screwdriver make neat holes in the neck of each of the two cans, then screw screws into them. Cable ends are released from the braid, the copper wires are cleaned with a knife from varnish, they join them under the hats of self-tapping screws. Very good to solder the resulting connection, but not necessarily.
The DVB-T2 digital antenna is almost made, it remains on a prepared rail or pipe to fasten the banks so that a distance of 7.5 cm is left between them. The second cable end is equipped with a standard plug connected to the receiver, the device is installed in the place of best fixing the signal. Placing such a type of device on the street requires reliable protection against bad weather. This is done by any waterproof material, often there are plastic bottles of large size. Antenna takes up to 15 channels of satellite television and digital broadcasting.
Using instruments and amplification
At a certain distance from the television tower of the antenna is capable of perceiving signals without installing additional reinforcing instruments. To receive a signal from a larger distance, the waves amplifier with separate power are reserved. The device is arranged near the tuner, and the negotiatory device is additionally made for its manufacture:
- potentiometer for adjusting the amplification;
- standard unleashing chokes L4 and L3;
- coils L2 and L1 wound in size from the directory;
- a metal screen for separating the circuits at the exit from the diagram of the device.
Amplifiers put no further than 3 meters from the place where the DVB-T2 antenna is installed from the cable, the resulting power supply from its own block. When installing an antenna not far from the broadcasting tower, it is not recommended to additionally use the amplifier, since the powerful signal worsens the image and has an extra on the entire design. The recommended cable length is three meters, the larger wire will lead to a symmetrizer unbalance.
Application of symmetrizer
This device is needed for any type of antenna, while not playing the roles, made it at the factory or in the craftsman of the craftsman. Antenna for DVB-T2, with your own hands made, gives good image quality if you connect to tyuner. If the cable length is more than 10 m, then when the structure is installed, inconsistencies of the resistance of the exterior space and cable arise. In this case, it is necessary to use a symmetrizer in a comprehensive antenna solution, which is much improving the image quality on the screen.
Cable gasket and antenna installation
The main rule is the installation of antenna to height. If this can not be done in the room, you need to make the device on the outer wall. To install an antenna in a private structure, digital broadcasting operators are calculated on the height of the device 10 m. If the antenna is located on the first floor of the house, then there are a number of metal structures, industry objects cause increasing reception.
When the antenna is located under a canopy or roof of the house draw attention to the roof material - it should not contain a metallized coating or spraying in the composition. Metal tile, professional flooring, iron or folgized insulation create significant interference to receive digital television signals.
For highly located receiving antennas on a metal mast or pin, it is provided for a steel rod in size for at least one meter to which the ground wire is connected. The device located on the roof is included in the general grounding system at home.
The cable is not displayed through the flue and ventilation channels, do not hang on the existing electrical wires, even if they look more than securely. The holes in the walls are placed with a slope, so that the moisture from the street did not register the inside of the room, use special plugs coming on sale. If the antenna is done well and correctly, take a cable and high-quality wall outlets, since after final finishing of the walls it is difficult to remake the cable in the wall and replace it to more reliable.
Compliance with safety instructions for antenna
Before installing or adjusting the already mounted antenna at an altitude, is convinced that this action is safe:
- do not climb into poorly fixed and shaky structures, if high-altitude works are associated with danger, be sure to put on the mounting belt and fasten it to the fixed part of the building structure;
- it is not allowed to keep an end to the assistant, without securing it in advance, when falling, the subband will not hold the body weight in his hands;
- it is forbidden to climb altitude alone, when icing structures, walk along the old roof, step on the connecting seams;
- it is forbidden to install an antenna in the rain and fog.
In conclusion, it should be said that it is quite simple to make an independently receiving device in order to watch digital television. DVB-T2 - antenna, made with their own hands, - in quality (if you follow the right technology) almost not inferior to store analogues. The cost of materials will save a decent amount of money, which is important for some people.
