Wire broadcasting in the present time is not attractive to almost all advertisers in our country. This is due to the fact that the solvency of its listeners and its popularity is very low.

It is the first – third button, respectively. The main advantages of this type of radio broadcasting include high sound quality and minimal interference. The receiver is very simple and relatively inexpensive. Also, the advantages include energy independence and high reliability.

But the disadvantages of wired radio is the fact that for its work is necessary to lay branched cable lines. To listen to this type of broadcasting uses a stationary receiver, and the number of listening programs is limited.

Most new buildings today are built without wired radio. Although newly built schools and houses are not allowed by law to be handed over without it. This is due to the civil defense requirements of our state. After all, this wire radio is not only the dissemination of the usual mass information. One of its main tasks is the rapid notification of the population in the event of an emergency in the country in wartime or peacetime.

Even during the Second World War with the help of wire radio warning the entire population about the impending raids of the enemy aircraft. It was virtually the only source of information at the time. Today, these receivers must be present in all medical institutions of our capital near each bed. It will allow to inform the patients about the impending danger in time.

Thanks to the rapid development of technology and equipment, modern home receivers were able to displace stationary receivers from the market. Broadcasting by loudspeakers, which used to stand on practically every pole and building, has also ceased.

Wired radio is present in many countries around the world. In some of them it operates through the telephone line. The sunset of wired radio was provoked by the increase in tariffs for its service, unprofitability, dissatisfaction of the elderly (pensioners).

In rural areas, the poles through which wired radio was laid have long since disappeared, and the cables themselves have been stolen. The new four-channel receivers were of rather poor quality. About 25 percent of them have been returned to the manufacturer.

It is true that there is also pirate wired radio. As you know, official radio broadcasting does not work at night. This is when the pirates connect to it, broadcasting their own programs. They still find their, albeit small, audience.

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Radio transmitters transmit information at a certain frequency of electromagnetic radiation. Such a radio transmitter and its accompanying equipment (power and communication channels, antennas, towers or masts, studios) are called a radio station.

Frequency itself is a fundamental factor in any such radio station. Originally, in the era of radio (early decades), wavelength was used to denote such oscillations. Accordingly, the scales of all radio receivers were graduated in meters. Nowadays, the frequency (kHz, MHz and GHz) is shown here.

Sound in broadcasting is modulated using the carrier frequency of the transmitter.

This is done using the following modulation methods:

Frequency (FM). It is used to carry out high-frequency radio broadcasting in the 66 to 108 MHz frequency range.

Amplitude (AM). It is used in other bands where the wavelengths are longer. This includes medium-wave broadcasting on CB, KV, DV, and DRM digital broadcasting.
On the ultra-short VHF band, letters and numbers can be transmitted in addition to audio data.

Radio communications and broadcasting equipment
A radio communication device is a type of electrical communication. A radio link is made using radio waves.

To make a radio call, you have to install special radio transmitting equipment at the point at which the signal is to be transmitted. This consists of a transmitting antenna and a signal transmitter. And in the place where it is planned to receive this signal, a radio receiver device is installed, also with an antenna and a receiver.

All electromagnetic oscillations generated in the transmitting equipment with a carrier frequency are subject to modulation, relying on the message being transmitted. All these radio frequency oscillations and constitute a radio signal.

In the transmitting antenna, the signal comes from the transmitter. As a result, electromagnetic waves are excited. As the waves propagate, they reach the antennas of the receivers themselves, where they excite electrical vibrations inside.

It is the radio waves that arrive at the radio receiver. But this signal is very weak. That is why the signal is initially amplified in the receiver, and only then is it decoded or demodulated. The signal is then converted by the playback equipment into a message which is completely identical to the original signal.

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Broadcasting radio today represents almost the last section of the electronics market.

The mass transition to digital technology has only just begun here. But the transition is necessary and driven by global progress in the entire digital industry, and by the unification of computer technology, information services, broadcasting and communications into one common system.

In the not-too-distant future, there will be a completely different, more powerful radio broadcasting, of high quality, without interference, not what we hear today. It will be a completely new place for the creative development of radio as an art of communication with its users, through the interactive exchange of information.

Today, digital broadcasting is getting a lot of attention from most of the industrialized countries of the world. What is so special about it? First of all, it opens the possibility to transmit radio programs of a high quality level comparable with the CD quality. Most of all, the differences will be noticeable with LF, SW and UHF waves in amplitude modulation mode.

DAB is adopted as the main standard for digital radio broadcasting. The audio signal can be transmitted at speeds ranging from 48 kbps to 320 kbps. MPEG-2, which is similar to MP3, is used as an audio compression standard.

As you know, 256 Kbit/s bitrate does not differ much from CD quality, and only an expert can tell the difference with 320 bitrate. So, we can safely say, that modern DAB radio can fully satisfy the needs of every audiophile and radio listener with its high quality sound.

Reception of radio signals for mobile users (in cars, ships, trains, etc.) also becomes more reliable. This increases the demand for DDR even more. The reason for this is that during such mobile radio listening there is the possibility of overlapping waves that come from the same source. This includes the Doppler effect, which changes the wavelength depending on the speed of the receiver itself.

All this affects the quality of the receiving signal. Digital broadcasting makes it possible to use coding that is resistant to interference. This ensures a correct and clear perception of all transmitted data.

In addition, digital receivers can automatically select the most powerful signal.

DSP systems quite easily provide and addressable receipt of information. In such receivers can be implemented pager functions. Finally, digital broadcasting has tremendous potential to be integrated with cell phones and computers.

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