Homemade Antenna Designed For Long Range Reception

Today, terrestrial television is the most common among users. It works by collecting radiation from the broadcaster to the receiver. Due to several factors, the antenna may fail, and it is not possible to install a new one at the moment. In this case, you can make a homemade antenna for digital television, which will receive a television signal no worse than factory devices. This article will discuss the manufacture of different types of antennas for digital TV with their own hands under specific conditions, for temporary and permanent use.

Types of Receiving Antennas A television antenna is a dipolar device that can radiate and receive a signal in a specific frequency range.

Today, several types of devices are common for television:

1. Meter wavelength range (MV antenna, VHF). Designed to receive on-air analog broadcasting, which occurs in the frequency range of 1 - 300 MHz.
2. Decimeter wave range (UHF antenna, UHF). They receive shorter radiation waves that transmit signals at frequencies of 0.3 - 3 GHz. In the UHF-band today broadcasts digital television standard DVB.

In this case, the frequency range is divided between two DTV broadcast formats:

1. Broadcast television (DVB-T2). It works by transmitting a signal from a broadcaster to a receiver through ground-based repeaters. The radiation of the signal occurs at frequencies of 314 - 898 MHz.
2. Satellite TV (DVB-C2). Broadcast at ultra high frequencies from 1 GHz.

From the above operating ranges, we can conclude that for a simple digital television antenna there is a limit to the minimum and maximum wavelengths that it can accept. So, before assembling the antenna with your own hands for digital television, you will need to calculate it.

Payment:

Depending on the design, you can make an all-wave antenna yourself or work in a specific frequency range. There is one fundamental difference between them - all-wave devices are not able to receive a weak signal, especially drowned out by a background of stronger radiation. Other homemade antennas do not cover all digital broadcast frequencies. In order to correctly make a working antenna for digital TV, it is necessary to approach its calculation responsibly for one more reason - in practice it is impossible to check the quality of digital signal reception. If, at a low signal level, analogue television works with noise, but shows, then there is no image in the figure and it is not clear whether the device has a problem or something else (cable, weak reception signal). In this case, development work with the antenna already turned on will not work.

Modern Smart TVs and receivers display the level of the signal recorded at the receiver, but most conventional digital devices do not support this function. It is impossible to make even a simple decimeter antenna yourself without calculation, unless it is an all-wave one.

Calculation Rules:

Digital TV broadcasts from different multiplexes at different frequencies, which corresponds to a different wavelength. In order to receive a high-quality signal, the emitted wave must completely "lie down" on the active region of the receiver.

Therefore, do-it-yourself antenna calculation for digital television should be done according to the following scheme:

1. calculate for the antenna the wavelength of DVB-T2 emitted during broadcasting of each multiplex;
2. choose the wave of the greatest length ;
3. calculate the half-length of the cross section of the wave, because it is projected perpendicularly to the receiver.

Below we will consider the procedure for calculating the active region for a digital antenna with your own hands, and as an example, we take the calculation of the broadcast frequency in your area.