North Macedonia the Republic of North Macedonia, is a country in the Balkan Peninsula in Southeast Europe. It is one of the successor states of the former Yugoslavia, from which it declared independence in September 1991 under the name Republic of Macedonia; the country became a member of the United Nations in April 1993, but as a result of a dispute with Greece over the name, it was admitted under the provisional description the former Yugoslav Republic of Macedonia, a term, used by some other international organisations. In June 2018, Macedonia and Greece resolved the conflict with an agreement that the country should rename itself Republic of North Macedonia; this renaming came into effect in February 2019, with a several-months-long transition for passports, licence plates, customs, border signs, government websites, among other things. A landlocked country, North Macedonia has borders with Kosovo to the northwest, Serbia to the northeast, Bulgaria to the east, Greece to the south, Albania to the west.
It constitutes the northern third of the larger geographical region of Macedonia, which comprises the neighbouring parts of northern Greece and southwestern Bulgaria. The country's geography is defined by mountains and rivers; the capital and largest city, Skopje, is home to a quarter of the nation's 2.06 million inhabitants. The majority of the residents are a South Slavic people. Albanians form a significant minority at around 25%, followed by Turks, Serbs, Bosniaks and Bulgarians; the history of the region dates back to antiquity, beginning with the kingdom of Paeonia a mixed Thraco-Illyrian polity. In the late sixth century BC, the area was incorporated into the Persian Achaemenid Empire annexed by the kingdom of Macedonia in the fourth century BC; the Romans conquered the region in the second century BC and made it part of the much larger province of Macedonia. Τhe area remained part of the Byzantine Empire, but was raided and settled by Slavic tribes beginning in the sixth century of the Christian era.
Following centuries of contention between the Bulgarian and Serbian Empire, it was part of the Ottoman dominion from the mid-14th until the early 20th century, when following the Balkan Wars of 1912 and 1913, the modern territory of North Macedonia came under Serbian rule. During the First World War it was ruled by Bulgaria, but after the end of the war, it returned under Serbian rule as part of the newly formed Kingdom of Serbs and Slovenes. During the Second World War, it was ruled by Bulgaria again, in 1945 it was established as a constituent communist republic into the Federal People's Republic of Yugoslavia, which it remained until its peaceful secession in 1991. North Macedonia is of the Council of Europe. Since 2005, it has been a candidate for joining the European Union and has applied for NATO membership. One of the poorest countries in Europe, North Macedonia has made significant progress in developing an open, market-based economy; the state's name derives from a kingdom named after the ancient Macedonians.
Their name, Μακεδόνες, derives from the ancient Greek adjective μακεδνός, meaning tall or taper, which shares the same root as the adjective μακρός, meaning long, tall, or high, in ancient Greek. The name is believed to have meant either highlanders or the tall ones descriptive of the people. According to linguist Robert S. P. Beekes, both terms are of Pre-Greek substrate origin and cannot be explained in terms of Indo-European morphology. Prior to June 2018, the use of the name Macedonia was disputed between Greece and the then-Republic of Macedonia; the Prespa agreement, signed by Macedonia and Greece on 17 June, saw the country change its name to the Republic of North Macedonia eight months later. A non-binding national referendum on the matter passed with 90% approval but did not reach the required 50% turnout due to a boycott, leaving the final decision with parliament to ratify the result. Parliament approved of the name change on 19 October, reaching the required two-thirds majority needed to enact constitutional changes.
The vote to amend the constitution and change the name of the country passed on 11 January 2019 in favour of the amendment. The amendment entered into force on 12 February, following the ratification of the Prespa agreement and the Protocol on the Accession of North Macedonia to NATO by the Greek Parliament. On 25 January, the Greek parliament had narrowly voted to back the agreement, with 153 approving and 146 against. Prior to February 2019, in Macedonian the country name was Македонија Република Македонија. North Macedonia geographically corresponds to the ancient kingdom of Paeonia, located north of the ancient kingdom of Macedonia. Paeonia was inhabited by the Paeonians, a Thracian people, whilst the northwest was inhabited by the Dardani and the southwest by tribes known as the Enchelae and Lyncestae. In the late 6th century BC, the Achaemenid Persians under Darius the Great conquered the Paeonians, incorporating w
Ukraine, sometimes called the Ukraine, is a country in Eastern Europe. Excluding Crimea, Ukraine has a population of about 42.5 million, making it the 32nd most populous country in the world. Its capital and largest city is Kiev. Ukrainian is the official language and its alphabet is Cyrillic; the dominant religions in the country are Greek Catholicism. Ukraine is in a territorial dispute with Russia over the Crimean Peninsula, which Russia annexed in 2014. Including Crimea, Ukraine has an area of 603,628 km2, making it the largest country within Europe and the 46th largest country in the world; the territory of modern Ukraine has been inhabited since 32,000 BC. During the Middle Ages, the area was a key centre of East Slavic culture, with the powerful state of Kievan Rus' forming the basis of Ukrainian identity. Following its fragmentation in the 13th century, the territory was contested and divided by a variety of powers, including Lithuania, Austria-Hungary, the Ottoman Empire and Russia. A Cossack republic emerged and prospered during the 17th and 18th centuries, but its territory was split between Poland and the Russian Empire, merged into the Russian-dominated Soviet Union in the late 1940s as the Ukrainian Soviet Socialist Republic.
In 1991 Ukraine gained its independence from the Soviet Union in the aftermath of its dissolution at the end of the Cold War. Before its independence, Ukraine was referred to in English as "The Ukraine", but most sources have since moved to drop "the" from the name of Ukraine in all uses. Following its independence, Ukraine declared itself a neutral state. In 2013, after the government of President Viktor Yanukovych had decided to suspend the Ukraine-European Union Association Agreement and seek closer economic ties with Russia, a several-months-long wave of demonstrations and protests known as the Euromaidan began, which escalated into the 2014 Ukrainian revolution that led to the overthrow of Yanukovych and the establishment of a new government; these events formed the background for the annexation of Crimea by Russia in March 2014, the War in Donbass in April 2014. On 1 January 2016, Ukraine applied the economic component of the Deep and Comprehensive Free Trade Area with the European Union.
Ukraine is ranks 88th on the Human Development Index. As of 2018, Ukraine has the second lowest GDP per capita in Europe. At US$40, it has the lowest median wealth per adult in the world, it suffers from a high poverty rate and severe corruption. However, because of its extensive fertile farmlands, Ukraine is one of the world's largest grain exporters. Ukraine maintains the second-largest military in Europe after that of Russia; the country is home to a multi-ethnic population, 77.8 percent of whom are Ukrainians, followed by a large Russian minority, as well as Georgians, Belarusians, Crimean Tatars, Jews and Hungarians. Ukraine is a unitary republic under a semi-presidential system with separate powers: legislative and judicial branches; the country is a member of the United Nations, the Council of Europe, the OSCE, the GUAM organization, one of the founding states of the Commonwealth of Independent States. There are different hypotheses as to the etymology of the name Ukraine. According to the older widespread hypothesis, it means "borderland", while some more recent linguistic studies claim a different meaning: "homeland" or "region, country"."The Ukraine" used to be the usual form in English, but since the Declaration of Independence of Ukraine, "the Ukraine" has become less common in the English-speaking world, style-guides recommend not using the definite article.
"The Ukraine" now implies disregard for the country's sovereignty, according to U. S. ambassador William Taylor. The Ukrainian position is that the usage of "'The Ukraine' is incorrect both grammatically and politically." Neanderthal settlement in Ukraine is seen in the Molodova archaeological sites which include a mammoth bone dwelling. The territory is considered to be the location for the human domestication of the horse. Modern human settlement in Ukraine and its vicinity dates back to 32,000 BC, with evidence of the Gravettian culture in the Crimean Mountains. By 4,500 BC, the Neolithic Cucuteni–Trypillia culture flourished in wide areas of modern Ukraine including Trypillia and the entire Dnieper-Dniester region. During the Iron Age, the land was inhabited by Cimmerians and Sarmatians. Between 700 BC and 200 BC it was Scythia. Beginning in the sixth century BC, colonies of Ancient Greece, Ancient Rome and the Byzantine Empire, such as Tyras and Chersonesus, were founded on the northeastern shore of the Black Sea.
These colonies thrived well into the 6th century AD. The Goths stayed in the area but came under the sway of the Huns from the 370s AD. In the 7th century AD, the territory of eastern Ukraine was the centre of Old Great Bulgaria. At the end of the century, the majority of Bulgar tribes migrated in different directions, the Khazars took over much of the land. In the 5th and 6th centuries, the Antes were located in the territory of; the Antes were the ancestors of Ukrainians: White Croats, Polans, Dulebes and Tiverians. Migrations from Ukraine throughout the Balkans established many Southern Slavic nations. Northern migrations, reaching to the Ilmen l
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
Telecommunications in Belgium
Communications in Belgium are extensive and advanced. Belgium possesses the infrastructure for both mobile and land-based telecom, as well as having significant television and internet infrastructure; the country code for Belgium is BE. Mail regulation is a national competency. Postal service in Belgium is in many cases performed by Belgian Post Group, a semi-private public company. Competitors include DHL and UPS. Postal codes in Belgium consist of four digits which indicate regional areas, e.g. "9000" is the postal code for Ghent. The telephone system itself is developed and technologically advanced, with full automation in facilities that handle domestic and international telecom. Domestically speaking, the county has a nationwide cellular telephone system and an extensive network of telephone cables. Telephone regulation is a national competency; the country code for Belgium is 32 and the international call prefix is 00. A telephone number in Belgium is a sequence of nine or ten numbers dialled on a telephone to make a call on the telephone network in Belgium.
Belgium is under a closed telephone numbering plan, but retains the trunk code, "0", for all national dialling. There were 4.668 million land telephone lines in use in Belgium in 2007, a slight decrease on the 4.769 million in use in 1997. The majority state-owned public telephone company of Belgium is Proximus; some other or private operators exist, as Base. Mobile telephone ownership has increased by nearly one thousand percent in the period 1997-2007, from 974,494 to 10.23 million. There are three licensed mobile network operators in Belgium, Orange Belgium and Telenet/Base and numerous mobile virtual network operators. A fourth license will be auctioned off by the government in January 2010. There were 61 internet service providers in Belgium, serving 8.113 million internet users in 2009. The country code for Belgian websites is.be. In September 2009 in Flanders there were 3,048,260 broadband internet customers, of which 2,520,481 were residential users and 527,779 business users. Only 65,175 dial-up internet access accounts remained in the residential market and 9,580 in the business market.
Belgium has numerous copper cable internet providers: Altercom *End service 2011 Base Proximus Destiny Digiweb EDPnet Evonet Full Telecom Interxion iPFix LCL Mobistar *End service: 2013 Numericable Perceval Portima Proximedia Group Scarlet Verizon Business ErgatelOnly Belgacom and Numericable offers fixed telephony and digital television in a triple play formula. All other companies offer fixed telephony in a duo play formula. Belgium has three major fiberglas cable internet providers: Numéricable for the Brussels region Telenet for the Flanders and Brussels regions VOO for the Walloon and Brussels regions Mobistar use Telenet and VOO network combined)These companies all offer fixed telephony and digital television in a triple play formula. Interoute Managed Services Interxion LCL Nucleus Verizon Business These companies all offer specialised services. Clearwire in Brussels, Leuven, Aalst and Vilvoorde Perceval Verizon Business The Brussels Regional Informatics Center offers Internet access to public administrations in the Brussels-Capital Region, relying directly on the national Belnet network and the IRISnet network.
Other ISP are Chat.be, HostIT, Microsoft Belgium, Ulysse, Ven Brussels, Rack66, WSD Hosting. The microwave relay network is, more limited. For international communications, Belgium has 5 submarine cables and a number of satellite earth stations, two of which are Intelsat, one Eutelsat. BIPT - Belgian Institute for Postal Services and Telecommunications ISPA - Internet Service Providers Association of Belgium DNS - Domain Name System Belgium MAVISE - Belgian TV market Agoria - Federation of Belgian IT Employers Beltug - Federation of Belgian ICT Professionals UPP - Union of Belgian Periodical Press Publishers Febelma - Belgian Federation of Magazines VRM - Flemish Media Regulator CSA - High Council for the Audiovisual Media MDGB - Germanic Media Council of Belgium
International Telecommunication Union
The International Telecommunication Union the International Telegraph Union, is a specialized agency of the United Nations, responsible for issues that concern information and communication technologies. It is the oldest among all the 15 specialised agencies of UN; the ITU coordinates the shared global use of the radio spectrum, promotes international cooperation in assigning satellite orbits, works to improve telecommunication infrastructure in the developing world, assists in the development and coordination of worldwide technical standards. The ITU is active in areas including broadband Internet, latest-generation wireless technologies and maritime navigation, radio astronomy, satellite-based meteorology, convergence in fixed-mobile phone, Internet access, voice, TV broadcasting, next-generation networks; the agency organizes worldwide and regional exhibitions and forums, such as ITU Telecom World, bringing together representatives of government and the telecommunications and ICT industry to exchange ideas and technology.
ITU, based in Geneva, Switzerland, is a member of the United Nations Development Group, has 12 regional and area offices in the world. ITU has been an intergovernmental public–private partnership organization since its inception, its membership includes 193 Member States and around 800 public and private sector companies, academic institutions as well as international and regional telecommunication entities, known as Sector Members and Associates, which undertake most of the work of each Sector. ITU was formed in Paris, at the International Telegraph Convention; the International Radiotelegraph Union was unofficially established at first International Radiotelegraph Convention in 1906. Both were merged into the International Telecommunication Union in 1932. ITU became a United Nations specialized agency in 1947; the ITU comprises three sectors, each managing a different aspect of the matters handled by the Union, as well as ITU Telecom. The sectors were created during the restructuring of ITU at its 1992 Plenipotentiary Conference.
Radio communication Established in 1927 as the International Radio Consultative Committee or CCIR, this sector manages the international radio-frequency spectrum and satellite orbit resources. In 1992, the CCIR became the ITU-R. Standardisation Standardisation was the original purpose of ITU since its inception. Established in 1956 as the International Telephone and Telegraph Consultative Committee or CCITT, this sector standardizes global telecommunications. In 1993, the CCITT became the ITU-T. Development Established in 1992, this sector helps spread equitable and affordable access to information and communication technologies. ITU Telecom ITU Telecom organizes major events for the world's ICT community. A permanent General Secretariat, headed by the Secretary General, manages the day-to-day work of the Union and its sectors; the basic texts of the ITU are adopted by the ITU Plenipotentiary Conference. The founding document of the ITU was the 1865 International Telegraph Convention, which has since been amended several times and is now entitled the "Constitution and Convention of the International Telecommunication Union".
In addition to the Constitution and Convention, the consolidated basic texts include the Optional Protocol on the settlement of disputes, the Decisions and Recommendations in force, as well as the General Rules of Conferences and Meetings of the Union. The ITU is headed by a Secretary-General, a Deputy Secretary General and the three directors of the Bureaux, who are elected to a four-year terms by the member states at the ITU Plenipotentiary Conference. On 23 October 2014 Houlin Zhao was elected 19th Secretary-General of the ITU at the Plenipotentiary Conference in Busan, Republic of Korea, his four-year mandate started on 1 January 2015, he was formally inaugurated on 15 January 2015. Houlin Zhao was reelected at the 2018 Plenipotentiary Conference in Dubai. Membership of ITU is open to only Member States of the United Nations, which may join the Union as Member States, as well as to private organizations like carriers, equipment manufacturers, funding bodies and development organizations and international and regional telecommunication organizations, which may join ITU as non-voting Sector Members.
There are 193 Member States of the ITU, including all UN member states except the Republic of Palau, plus the Vatican City. The most recent member state to join the ITU is South Sudan, which became a member on 14 July 2011; the Republic of China was blocked from membership by the People's Republic of China, but received a country code, being listed as "Taiwan, China". Palestine was admitted as an observer in 2010. Six Regional Offices and seven Area Offices guarantee a regional presence of ITU: Regional Office for CSI Africa Regional Office in Addis Ababa, with Area Offices in Dakar and Yaoundé Arab States Regional Office in Cairo Asia-Pacific Regional Office in Bangkok, with Area Office in Jakarta America Regional Office in Brasilia, with Area Offices in Bridgetown and Tegucigalpa; the sixth is a Coordination office for Europe Region Europe at ITU Headquarters. Other Regional organizations, connected to ITU, are: Asia-Pacific Telecommunity Arab Spectrum Management Group African Telecommunications Union European Conference of Posta
The World Factbook
The World Factbook known as the CIA World Factbook, is a reference resource produced by the Central Intelligence Agency with almanac-style information about the countries of the world. The official print version is available from the Government Printing Office. Other companies—such as Skyhorse Publishing—also print a paper edition; the Factbook is available in the form of a website, updated every week. It is available for download for use off-line, it provides a two- to three-page summary of the demographics, communications, government and military of each of 267 international entities including U. S.-recognized countries and other areas in the world. The World Factbook is prepared by the CIA for the use of U. S. government officials, its style, format and content are designed to meet their requirements. However, it is used as a resource for academic research papers and news articles; as a work of the U. S. government, it is in the public domain in the United States. In researching the Factbook, the CIA uses the sources listed below.
Other public and private sources are consulted. Antarctic Information Program Armed Forces Medical Intelligence Center Bureau of the Census Bureau of Labor Statistics Council of Managers of National Antarctic Programs Defense Intelligence Agency Department of Energy Department of State Fish and Wildlife Service Maritime Administration National Geospatial-Intelligence Agency Naval Facilities Engineering Command Office of Insular Affairs Office of Naval Intelligence Oil & Gas Journal United States Board on Geographic Names United States Transportation Command Because the Factbook is in the public domain, people are free under United States law to redistribute it or parts of it in any way that they like, without permission of the CIA. However, the CIA requests. Copying the official seal of the CIA without permission is prohibited by U. S. federal law—specifically, the Central Intelligence Agency Act of 1949. Before November 2001 The World Factbook website was updated yearly. Information available as of January 1 of the current year is used in preparing the Factbook.
The first, edition of Factbook was published in August 1962, the first unclassified version in June 1971. The World Factbook was first available to the public in print in 1975. In 2008 the CIA discontinued printing the Factbook themselves, instead turning printing responsibilities over to the Government Printing Office; this happened due to a CIA decision to "focus Factbook resources" on the online edition. The Factbook has been on the World Wide Web since October 1994; the web version receives an average of 6 million visits per month. The official printed version is sold by the Government Printing Office and National Technical Information Service. In past years, the Factbook was available on CD-ROM, magnetic tape, floppy disk. Many Internet sites use information and images from the CIA World Factbook. Several publishers, including Grand River Books, Potomac Books, Skyhorse Publishing have re-published the Factbook in recent years; as of July 2011, The World Factbook comprises 267 entities, which can be divided into the following categories: Independent countries The CIA defines these as people "politically organized into a sovereign state with a definite territory."
In this category, there are 195 entities. Others Places set apart from the list of independent countries. There are two: Taiwan and the European Union. Dependencies and Areas of Special Sovereignty Places affiliated with another country, they may be subcategorized by affiliated country: Australia: six entities China: two entities Denmark: two entities France: eight entities Netherlands: three entities New Zealand: three entities Norway: three entities United Kingdom: seventeen entities United States: fourteen entitiesMiscellaneous Antarctica and places in dispute. There are six such entities. Other entities The World and the oceans. There are the World. Areas not covered Specific regions within a country or areas in dispute among countries, such as Kashmir, are not covered, but other areas of the world whose status is disputed, such as the Spratly Islands, have entries. Subnational areas of countries are not included in the Factbook. Instead, users looking for information about subnational areas are referred to "a comprehensive encyclopedia" for their reference needs.
This criterion was invoked in the 2007 and 2011 editions with the decision to drop the entries for French Guiana, Martinique and Reunion. They were dropped because besides being overseas departments, they were now overseas regions, an integral part of France. Kashmir Maps depicting Kashmir have the Indo-Pakistani border drawn at the Line of Control, but the region of Kashmir administered by China drawn in hash marks. Northern Cyprus Northern Cyprus, which the U. S. considers part of the Republic of Cyprus, is not given a separate entry because "territorial occupations/annexations not recognized by the United States Government are not shown on U. S. Government maps."Taiwan/Republic of China The name
FM broadcasting is a method of radio broadcasting using frequency modulation technology. Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to provide high-fidelity sound over broadcast radio. FM broadcasting is capable of better sound quality than AM broadcasting, the chief competing radio broadcasting technology, so it is used for most music broadcasts. Theoretically wideband AM can offer good sound quality, provided the reception conditions are ideal. FM radio stations use the VHF frequencies; the term "FM band" describes the frequency band in a given country, dedicated to FM broadcasting. Throughout the world, the FM broadcast band falls within the VHF part of the radio spectrum. 87.5 to 108.0 MHz is used, or some portion thereof, with few exceptions: In the former Soviet republics, some former Eastern Bloc countries, the older 65.8–74 MHz band is used. Assigned frequencies are at intervals of 30 kHz; this band, sometimes referred to as the OIRT band, is being phased out in many countries.
In those countries the 87.5–108.0 MHz band is referred to as the CCIR band. In Japan, the band 76–95 MHz is used; the frequency of an FM broadcast station is an exact multiple of 100 kHz. In most of South Korea, the Americas, the Philippines and the Caribbean, only odd multiples are used. In some parts of Europe and Africa, only multiples are used. In the UK odd or are used. In Italy, multiples of 50 kHz are used. In most countries the maximum permitted frequency error is specified, the unmodulated carrier should be within 2000 Hz of the assigned frequency. There are other unusual and obsolete FM broadcasting standards in some countries, including 1, 10, 30, 74, 500, 300 kHz. However, to minimise inter-channel interference, stations operating from the same or geographically close transmitter sites tend to keep to at least a 500 kHz frequency separation when closer frequency spacing is technically permitted, with closer tunings reserved for more distantly spaced transmitters, as interfering signals are more attenuated and so have less effect on neighboring frequencies.
Frequency modulation or FM is a form of modulation which conveys information by varying the frequency of a carrier wave. With FM, frequency deviation from the assigned carrier frequency at any instant is directly proportional to the amplitude of the input signal, determining the instantaneous frequency of the transmitted signal; because transmitted FM signals use more bandwidth than AM signals, this form of modulation is used with the higher frequencies used by TV, the FM broadcast band, land mobile radio systems. The maximum frequency deviation of the carrier is specified and regulated by the licensing authorities in each country. For a stereo broadcast, the maximum permitted carrier deviation is invariably ±75 kHz, although a little higher is permitted in the United States when SCA systems are used. For a monophonic broadcast, again the most common permitted. However, some countries specify a lower value for monophonic broadcasts, such as ±50 kHz. Random noise has a triangular spectral distribution in an FM system, with the effect that noise occurs predominantly at the highest audio frequencies within the baseband.
This can be offset, to a limited extent, by boosting the high frequencies before transmission and reducing them by a corresponding amount in the receiver. Reducing the high audio frequencies in the receiver reduces the high-frequency noise; these processes of boosting and reducing certain frequencies are known as pre-emphasis and de-emphasis, respectively. The amount of pre-emphasis and de-emphasis used is defined by the time constant of a simple RC filter circuit. In most of the world a 50 µs time constant is used. In the Americas and South Korea, 75 µs is used; this applies to both stereo transmissions. For stereo, pre-emphasis is applied to the left and right channels before multiplexing; the use of pre-emphasis becomes a problem because of the fact that many forms of contemporary music contain more high-frequency energy than the musical styles which prevailed at the birth of FM broadcasting. Pre-emphasizing these high frequency sounds would cause excessive deviation of the FM carrier. Modulation control devices are used to prevent this.
Systems more modern than FM broadcasting tend to use either programme-dependent variable pre-emphasis. Long before FM stereo transmission was considered, FM multiplexing of other types of audio level information was experimented with. Edwin Armstrong who invented FM was the first to experiment with multiplexing, at his experimental 41 MHz station W2XDG located on the 85th floor of the Empire State Building in New York City; these FM multiplex transmissions started in November 1934 and consisted of the main channel audio program and three subcarriers: a fax program, a synchronizing signal for the fax program and a telegraph “order” channel. These original FM multiplex subcarriers were amplitude modulated. Two musical programs, consisting of both the Red and Blue Network program feeds of the NBC Radio Network, were transmitted using the same system of subcarrier modulation as part of a studio-to-transmitter link system. In April 1935, the AM subcarriers were replaced with much improved results.
The first FM subcarrier transmissions emanating from Major Armstrong's experimental station KE2XCC at Alpine, New Jersey occurred in 1948. These transmissions consisted of two-cha