This article covers the radio and television technology in Turkey.
Contents
This article covers the radio and television technology in Turkey.
The highest authority in radio and television broadcasting is Radio and Television Supreme Council (abbreviated RTÜK). RTÜK is responsible in both the content of the programs and the technical infrastructure of the broadcasting. [1]
According to Milliyet newspaper total number of radio stations in Turkey is 1078 [2] (2010 figure). The main broadcaster is Turkish Radio and Television Corporation (abbreviated TRT), a public broadcaster. TRT broadcasts 7 national, 6 regional and 5 international radio channels. TRT uses long wave, medium wave and FM band for the domestic broadcast. The short wave is reserved for international services (Voice of Turkey). [3] The private companies however prefer FM band. The method of sterephony is zenith tone system.
According to a report by RTÜK, there are 63 nationwide, 113 regional, and 1129 local broadcasters. [4] Turkey uses CCIR System B in VHF Band and CCIR System G in UHF Band. The color information is superimposed by PAL method. TRT uses both the VHF and UHF Bands. VHF is reserved for TRT 1 and UHF for the others. The private broadcasters use UHF band. According to the regulation a channel difference of at least 3 channels (21 MHz in VHF and 24 MHz in UHF) is required in each region. Thus in certain high population-density areas some broadcasters face the problem of shortage in channel availability. The stereophonic sound in analogue transmission is coded by Zweikanalton method.
TRT has 14 nationwide channels. [3] While the basic transmission is carried on by the Transmitter stations, most are broadcast by satellite. All nationwide private broadcasters as well as a few regional broadcasters also use satellite broadcasting. The Türksat company distributes the satellite channels by cable. The direct broadcast is provided by two companies: Digitürk and D-Smart. Some of their channels are in HDTV format.
Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF).
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter. Radio waves with frequencies above the UHF band fall into the super-high frequency (SHF) or microwave frequency range. Lower frequency signals fall into the VHF or lower bands. UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is strong enough for indoor reception. They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications.
Terrestrial television is a type of television broadcasting in which the television signal is transmitted by radio waves from the terrestrial (Earth-based) transmitter of a television station to a TV receiver having an antenna. The term terrestrial is more common in Europe and Latin America, while in the United States it is called broadcast or over-the-air television (OTA). The term "terrestrial" is used to distinguish this type from the newer technologies of satellite television, in which the television signal is transmitted to the receiver from an overhead satellite; cable television, in which the signal is carried to the receiver through a cable; and Internet Protocol television, in which the signal is received over an Internet stream or on a network utilizing the Internet Protocol. Terrestrial television stations broadcast on television channels with frequencies between about 52 and 600 MHz in the VHF and UHF bands. Since radio waves in these bands travel by line of sight, reception is generally limited by the visual horizon to distances of 64–97 kilometres (40–60 mi), although under better conditions and with tropospheric ducting, signals can sometimes be received hundreds of kilometers distant.
The FM broadcast band is a range of radio frequencies used for FM broadcasting by radio stations. The range of frequencies used differs between different parts of the world. In Europe and Africa and in Australia, it spans from 87.5 to 108 megahertz (MHz) - also known as VHF Band II - while in the Americas it ranges from 88 to 108 MHz. The FM broadcast band in Japan uses 76 to 95 MHz. The International Radio and Television Organisation (OIRT) band in Eastern Europe is from 65.8 to 74.0 MHz, although these countries now primarily use the 87.5 to 108 MHz band, as in the case of Russia. Some other countries have already discontinued the OIRT band and have changed to the 87.5 to 108 MHz band.
The Turkish Radio and Television Corporation is the national public broadcaster of Turkey, founded in 1964. Around 70% of TRT's funding comes from a tax levied on electricity bills and a license tax on television and radio receivers. As these are hypothecated taxes, as opposed to the money coming from general government funds, the principle is similar to that of the television licence levied in a number of other countries, such as the BBC in the United Kingdom. The rest of TRT's funding comes from government grants, with the final 10% coming from advertising.
The radio spectrum is the part of the electromagnetic spectrum with frequencies from 30 Hz to 300 GHz. Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU).
A diplexer is a passive device that implements frequency-domain multiplexing. Two ports are multiplexed onto a third port. The signals on ports L and H occupy disjoint frequency bands. Consequently, the signals on L and H can coexist on port S without interfering with each other.
The following tables show the frequencies assigned to broadcast television channels in various regions of the world, along with the ITU letter designator for the system used. The frequencies shown are for the analogue video and audio carriers. The channel itself occupies several megahertz of bandwidth. For example, North American channel 2 occupies the spectrum from 54 to 60 MHz. See Broadcast television systems for a table of signal characteristics, including bandwidth, by ITU letter designator.
A television antenna is an antenna specifically designed for use with a television receiver (TV) to receive over-the-air broadcast television signals from a television station. Terrestrial television is broadcast on frequencies from about 47 to 250 MHz in the very high frequency (VHF) band, and 470 to 960 MHz in the ultra high frequency (UHF) band in different countries. Television antennas are manufactured in two different types: "indoor" antennas, to be located on top of or next to the television set, and "outdoor" antennas, mounted on a mast on top of the owner's house. They can also be mounted in a loft or attic, where the dry conditions and increased elevation are advantageous for reception and antenna longevity. Outdoor antennas are more expensive and difficult to install, but are necessary for adequate reception in fringe areas far from television stations. The most common types of indoor antennas are the dipole and loop antennas, and for outdoor antennas the yagi, log periodic, and for UHF channels the multi-bay reflective array antenna.
A television station is a set of equipment managed by a business, organisation or other entity, such as an amateur television (ATV) operator, that transmits video content and audio content via radio waves directly from a transmitter on the earth's surface to any number of tuned receivers simultaneously.
The mass media in Turkey includes a wide variety of domestic and foreign periodicals expressing disparate views, and domestic newspapers are extremely competitive. However, media ownership is concentrated in the hands of a few large private media groups which are typically part of wider conglomerates controlled by wealthy individuals, which limits the views that are presented. In addition, the companies are willing to use their influence to support their owners' wider business interests, including by trying to maintain friendly relations with the government. The media exert a strong influence on public opinion. Censorship in Turkey is also an issue, and in the 2000s Turkey has seen many journalists arrested and writers prosecuted. On Reporters Without Borders' Press Freedom Index it has fallen from being ranked around 100 in 2005 to around 150 in 2013.
Channel 37 is an intentionally unused ultra-high frequency (UHF) television broadcasting channel in the United States, Canada and Mexico and some of Eurasian region. The frequency range allocated to this channel is important for radio astronomy, so broadcasting is not licensed.
The television industry in Turkey includes high-tech program production, transmission and coverage. Turkish Radio and Television Corporation is Turkey's largest and most powerful national television station. As of 1 August 2019, RTÜK states that there a total of 536 television channels in Turkey. Turkey is the world's fastest growing television series exporter and has currently overtaken both Mexico and Brazil as the world's second highest television series exporter after the United States. Turkish television drama has grown in since the early 2000s.
Band I is a range of radio frequencies within the very high frequency (VHF) part of the electromagnetic spectrum. The first time there was defined "for simplicity" in Annex 1 of "Final acts of the European Broadcasting Conference in the VHF and UHF bands - Stockholm, 1961". Band I ranges from 47 to 68 MHz for the European Broadcasting Area, and from 54 to 88 MHz for the Americas and it is primarily used for television broadcasting in compliance with ITU Radio Regulations. With the transition to digital TV, most Band I transmitters in Europe, Africa, Asia and Australia have already been switched off.
Television frequency allocation has evolved since the start of television in Australia in 1956, and later in New Zealand in 1960. There was no coordination between the national spectrum management authorities in either country to establish the frequency allocations. The management of the spectrum in both countries is largely the product of their economical and political situation. New Zealand didn't start to develop television service until 1965 due to World War 2 and its economic harm in the country's economy.
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing and other applications.
UHF television broadcasting is the use of ultra high frequency (UHF) radio for over-the-air transmission of television signals. UHF frequencies are used for both analog and digital television broadcasts. UHF channels are typically given higher channel numbers, like the US arrangement with VHF channels 2 to 13, and UHF channels numbered 14 to 83. Compared with an equivalent VHF television transmitter, to cover the same geographic area with a UHF transmitter requires a higher effective radiated power, implying a more powerful transmitter or a more complex antenna. However, the additional channels allow more broadcasters in a given region without causing objectionable mutual interference.
The Pan-American television frequencies are different for terrestrial and cable television systems. Terrestrial television channels are divided into two bands: the VHF band which comprises channels 2 through 13 and occupies frequencies between 54 through 216 MHz, and the UHF band, which comprises channels 14 through 51 and occupies frequencies between 470 and 700 MHz. These bands are different enough in frequency that they often require separate antennas to receive, and separate tuning controls on the television set. The VHF band is further divided into two frequency ranges: VHF low band between 54 and 88 MHz, containing channels 2 through 6, and VHF high band between 174 and 216 MHz, containing channels 7 through 13. The wide spacing between these frequency bands is responsible for the complicated design of rooftop TV antennas. The UHF band has higher noise and greater attenuation, so higher gain antennas are often required for UHF.
CCIR System I is an analog broadcast television system. It was first used in the Republic of Ireland starting in 1962 as the 625-line broadcasting standard to be used on VHF Band I and Band III, sharing Band III with 405-line System A signals radiated in the north and east of the country. The UK started its own 625-line television service in 1964 also using System I, but on UHF only – the UK has never used VHF for 625-line television except for some cable relay distribution systems.
Radio enjoys numerous listeners in Turkey. There are more than 1000 radio stations in the country. The first radio studio was formed in Turkey in Ankara Radio.