DIY do-it-yourself television antenna for digital television: dimensions, simple diagram, outdoor and indoor antenna for digital television, made by yourself. Just recently, television appeared in a person’s life. For almost a hundred years in our reality there has been such a thing as a TV. From their invention until recently, televisions have been powered by analog signal technology. The main difference from the modern type of signal used, digital, is the transmission of electricity to the receiver. This electricity corresponds to a certain frequency and amplitude, which is subsequently converted into an image and sound.Its price is significantly less than that of a copper cable, but it has the same properties as another popular conductor, widely common in electrical engineering. In extreme cases, you can use a regular antenna wire. One antenna is useless and doesn’t make sense without the other details that help transform the digital signal into a picture. In addition to the above materials for the antenna, you will need:
a plug that transmits a signal from the antenna to the receiver;
if the TV is of an old model – a receiver – a receiver;
the TV itself.
You can give the materials the desired shape and fasten them without special tools, but to simplify work and save time, it is worth preparing pliers and wire cutters, insulating tape, and a soldering iron.
Varieties of antennas that receive a high-quality digital signal for do-it-yourself manufacturing
A wide choice in technologies for manufacturing antennas from improvised materials allows you to proceed from your capabilities and circumstances. It happens that a person cannot physically get the necessary materials in the near future. Improvised tools come to the rescue, which almost everyone has in the garage. The antenna is a structure, a device designed to capture the waves of television broadcasting. Devices that are intended for general use are capable of picking up a frequency in the range from 41 to 250 MHz. It is less likely, but possible, that a homemade antenna will be able to pick up ultra-high frequency waves, which range from 470-960 MHz. Capturing devices designed for televisions, can be divided into two categories – internal (located near the TV in close proximity) and external (installed on the outside of the building in which the TV is located). Step Two According to the resulting marks, bend the wire at an angle of 90°. We solder only the free ends of the wire. In this case, a gap should be obtained between the inner corners: soldered and bent. Step ThreeThe antenna wire is exposed from one end by 3-5 cm. To do this, the outer insulation is carefully removed, the internal parts are bent and the central core is released. The central core of the wire is wrapped around the non-soldered corner, and the part of the wire responsible for the screen is wrapped around the soldered area. It is important to make the winding tight. Step Four The resulting structure of bare wires is insulated with electrical tape or with a glue gun. A plug is attached to the other end of the wire to transmit a signal to the TV. The device is ready, the bent end is attached to the base.
The main features of this design is the arrangement of vibrators of variable length – they are mounted on the same axis. The dimensions of all working elements of a log-periodic antenna should not go beyond the location of action and capture. A log-periodic antenna is the best option for home performance, as it surpasses other types in all characteristics, but it is difficult to manufacture. In order to make it yourself, you should have two metal tubes (hollow or not – it doesn’t matter, the current will run along the surface). You should also have copper wires of different lengths, which will be the receiving parts. Below is a table with ready-made calculations that should be applied when preparing parts for a future signal receiver. We prepare vibrators according to the data given in the table. It is important that the diameter is the same for each vibrator. A feeder cable is passed through the cavity of one of the rods or simply with the help of fasteners, which is carried out as shown in the image below. After that, the vibrators are fixed with a soldering iron. Do-it-yourself powerful log-periodic UHF antenna: https://youtu.be/txZJkjPkOoY
It is not suitable for receiving long-range signals and has little gain, but the design itself has been popular since the invention and propagation of radio waves in everyday life, and is still popular. The design consists of several elements: a copper wire (or tube), a director, a reflector and a vibrator. Additionally, a base is created to which the finished antenna will be attached (plastic or wood – it does not matter, the main thing is that it be a dielectric). It is important to place the parts at an equal distance from each other. The parts are connected in accordance with the figure below.
How to improve signal quality on homemade antennas
There are many reasons why the TV signal is weak. For example, image quality is often lost or sound is lost due to the fact that the antenna receives only the reflected signal. Other reasons may be:
high resistance cable;
long distance from the TV tower;
In order to improve the signal quality on homemade antennas, you need to try the following steps:
If it is indoor, then you should place it as close to the window as possible. So on its way there will be fewer obstacles due to which part of the signal is lost.
If it is located on the street, you need to install it on a higher place – the roof. Make sure the signal is not obstructed by mountains or forests.
Change direction. Interference and scattering of the picture often disappears if you turn the receiving device in the right direction, even a few tens of degrees play a role.
Buy an antenna amplifier.
How to calculate parameters for digital TV
For an antenna from a cable, you need to calculate its length. This is done using the usual formulas of physics. First you need to understand at what frequencies the multiplex broadcasts , after which we derive the average value. For example, at frequencies of 605 and 613 MHz, the arithmetic mean is displayed to be 609 MHz. The next step is to determine the wavelength through the formula for the speed of light divided by the derived arithmetic mean. Calculation: 300/609 \u003d 0.492 m. From the resulting number we calculate 1/4, which will be the required cable length to create an antenna. To facilitate the calculation task, you can use online calculators that will accurately calculate the required size for half-wave, quarter-wave and full-wave antennas. Online calculators in Google or Yandex:
dipole and pin calculator;
amateur radio calculator.
The best do-it-yourself antenna without a soldering iron for T2 digital television: https://youtu.be/h7pcp-nvYqQ Making an antenna with your own hands is not difficult, it is quite problematic to solder and attach all the details so that it works without interference and picture spillage. Today it is not necessary to go to the store and buy expensive equipment, there are situations when it is simply not possible to get to the store. You can make an antenna from improvised materials. We advise you to choose either the design of the coaxial wire, or the “Eight”. As practice shows, they are the easiest to manufacture, and their characteristics allow you to watch TV anywhere.