DIY Digital TV Antennas

The era of digital-type signals has come a long time ago. Absolutely all television companies offer services of a similar format, since analog TV goes out of fashion, surviving the last days. Of course, many families still have older devices. Many people want to “exhaust” the old resource before buying new equipment, but for complete enjoyment, you need to connect a set-top box and a special antenna. But do you really want to overpay for the purchase of such a device, if you can assemble an antenna for a digital TV with your own hands? Let's get acquainted with the most popular instructions for carrying out such work.

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How does a television antenna work?

Each TV signal is distributed in space through emitters that transmit an electromagnetic wave of a sinusoidal shape from the TV tower to the antenna of your TV. The waves have a high frequency, and the equipment sets the voltage necessary for operation.

The steady-state voltage is applied to the output of the closed receiving circuit of the input signal with resistance, in which the electric current flows.

The current is amplified using a special circuit of a digital TV and enters the screen in the form of a picture and sound familiar to us.

Important! For analog equipment, TV models have an intermediate link in this work - this is a special prefix that decrypts the digital data of the incoming wave.

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Planes of electromagnetic waves

According to state standards, it is customary to radiate a signal in the following two planes:

• Horizontal
• Vertical.

Only by such methods converters direct radiation.

Important! Users are required to direct their satellite dish in the direction of the required plane in order to find the maximum value of the power potential. However, an option is possible do-it-yourself satellite dish.

How to make a digital antenna for your TV with your own hands? An understanding of the processes will require a few more recommendations.

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What is required for normal operation?

Most often, television transmitters distribute “data” only over short distances, which are limited by the line of sight from the highest point of the tower. The maximum propagation distance rarely exceeds 70 kilometers. Of course, for such stations it is necessary to provide the power of the emitted TV signal with small values, but the electromagnetic wave strength should provide a normal voltage at the ends of the output.

The antenna has voltage values ​​of small magnitude, measured in millivolts. It is the receiver that creates the current with small amplitudes, which calls for high technical requirements during installation and a high-quality selection of all components.

Important! The design must be made with extreme caution and a high degree of accuracy, which eliminates all loss of the useful signal. The direction should be set strictly along the axis of propagation of the EM wave, which goes from the main center. If the signal quality is still unsatisfactory, we recommend choose a satellite dish with an amplifier.

Also, do not lose sight of the fact that there is always a risk of being exposed to other signals that will play the role of interference in the operation of our antenna.

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Basic calculations

There is the most important parameter that most affects the quality of digital signal transmission - this is the EM wavelength of the radiation. For her, it will be necessary to create special symmetrical shoulders of a vibrator of various shapes, which in the future will determine the overall dimensions of the installation.

Important! “Lambda” (wavelength) is measured in centimeters and is very simply calculated using one formula: “Lambda” = 300 / f, where f is the frequency of the received signal, which is measured in megahertz. In order to determine this parameter, we will use some search engine and request a list of all regional television points to communicate with your location.

Consider an example for a complete understanding:

• Suppose the wave frequency is 600 MHz. The type of polarization for a particular case is horizontal.
• Now you need to perform the calculation: 300/600 = 0.5 m.
• 0.5 m is the EM wavelength that you will need to create an antenna.
• Next, we divide this parameter into two and get 25 centimeters - the length of our desired half-wave.

Let's start creating an antenna for digital TV with our own hands, and the instructions below will help us with this.

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Equipment creation

Before embarking on the installation, you need to prepare a little:

• First you need to get a cable with Rv (wave impedance) of 75 Ohms and a special plug for connecting the antenna.
• The free end of the conductor must be freed from the outer shell.

Important! It is best to take the length with a small margin, since with the pad it is much easier to bite off a small part.

• Now you need to remove the shielding material from the trimmed portion of our cable.
• Next, you will need to expose the central core and also remove insulation material from it.
• With the cable on this finished.

Now you need to install the whole thing in the socket of the plug on your console and direct the side that is bare across the received EM wave, taking into account the type of polarization.

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Advice:

• It is best to place the antenna directly on the window sill of the window or fix it firmly on the glass - pieces of adhesive tape or a garter to fasten the blinds can help you with this.
• You will be able to shield all reflected signals and interference with a flat foil, which will need to be placed at a small distance from the central core. This design is literally created in ten minutes and does not cost at all if you have an extra cable at home.
• Do not forget to test your equipment, but remember that all work is possible only in the area of ​​good reception of EM waves.

Important! During operation, do not forget about basic safety measures, as it works with devices powered by electric current.

Wanting to be smart and make the device with your own hands, we present to your attention beer can satellite dishmade by yourself.

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Stock footage

Today you learned how to make a digital antenna for your TV with your own hands, without spending your money. It’s quite interesting to do something on your own, as it is very profitable and brings valuable experience.