1.
Edmonton
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Edmonton /ˈɛdməntən/ is the capital city of the Canadian province of Alberta. Edmonton is on the North Saskatchewan River and is the centre of the Edmonton Capital Region, the city anchors the north end of what Statistics Canada defines as the Calgary–Edmonton Corridor. The city had a population of 932,546 in 2016, making it Albertas second-largest city, also in 2016, Edmonton had a metropolitan population of 1,321,426, making it the sixth-largest census metropolitan area in Canada. Edmonton is North Americas northernmost city with a population over one million. A resident of Edmonton is known as an Edmontonian, Edmontons historic growth has been facilitated through the absorption of five adjacent urban municipalities and a series of annexations ending in 1982. Known as the Gateway to the North, the city is a point for large-scale oil sands projects occurring in northern Alberta. Edmonton is a cultural, governmental and educational centre and it hosts a year-round slate of festivals, reflected in the nickname Canadas Festival City. It is home to North Americas largest mall, West Edmonton Mall, in 1754, Anthony Henday, an explorer for the Hudsons Bay Company, may have been the first European to enter the Edmonton area. By 1795, Fort Edmonton was established on the north bank as a major trading post for the Hudsons Bay Company. The new forts name was suggested by John Peter Pruden after Edmonton, London, the home town of both the HBC deputy governor Sir James Winter Lake, and Pruden. In 1876, Treaty 6, which includes what is now Edmonton, was signed between the Aboriginal peoples in Canada and Queen Victoria as Queen of Canada, as part of the Numbered Treaties of Canada. The agreement includes the Plains and Woods Cree, Assiniboine, and other governments of First Nations at Fort Carlton, Fort Pitt. The area covered by the treaty represents most of the area of the current provinces of Saskatchewan. The arrival of the CPR and the C&E Railway helped bring settlers and entrepreneurs from eastern Canada, Europe, U. S. the Edmonton areas fertile soil and cheap land attracted settlers, further establishing Edmonton as a major regional commercial and agricultural centre. Some people participating in the Klondike Gold Rush passed through South Edmonton/Strathcona in 1897, in November 1905, the Canadian Northern Railway arrived in Edmonton, accelerating growth. During the early 1900s, Edmontons rapid growth led to speculation in real estate, in 1912, Edmonton amalgamated with the City of Strathcona, south of the North Saskatchewan River, as a result, the city extended south of the North Saskatchewan River for the first time. Just prior to World War I, the boom ended, many impoverished families moved to subsistence farms outside the city, while others fled to greener pastures in other provinces. Recruitment to the Canadian army during the war contributed to the drop in population
2.
Alberta
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Alberta is a western province of Canada. With an estimated population of 4,196,457 as of July 1,2015, it is Canadas fourth-most populous province and its area is about 660,000 square kilometres. Alberta and its neighbour Saskatchewan were districts of the Northwest Territories until they were established as provinces on September 1,1905, the premier has been Rachel Notley since May 2015. Alberta is bounded by the provinces of British Columbia to the west and Saskatchewan to the east, the Northwest Territories to the north, and the U. S. state of Montana to the south. Alberta is one of three Canadian provinces and territories to only a single U. S. state and one of only two landlocked provinces. About 290 km south of the capital is Calgary, the largest city in Alberta, Calgary and Edmonton centre Albertas two census metropolitan areas, both of which have populations exceeding one million, while the province has 16 census agglomerations. Tourist destinations in the province include Banff, Canmore, Drumheller, Jasper, Alberta is named after Princess Louise Caroline Alberta, the fourth daughter of Victoria, Queen of Canada, and Albert, Prince Consort. Princess Louise was the wife of John Campbell, Marquess of Lorne, Lake Louise and Mount Alberta were also named in her honour. Alberta, with an area of 661,848 km2, is the fourth largest province after Quebec, Ontario and British Columbia. To the south, the borders on the 49th parallel north, separating it from the US state of Montana. The province extends 1,223 km north to south and 660 km east to west at its maximum width, with the exception of the semi-arid steppe of the south-eastern section, the province has adequate water resources. There are numerous rivers and lakes used for swimming, fishing, there are three large lakes, Lake Claire in Wood Buffalo National Park, Lesser Slave Lake, and Lake Athabasca which lies in both Alberta and Saskatchewan. The longest river in the province is the Athabasca River which travels 1,538 km from the Columbia Icefield in the Rocky Mountains to Lake Athabasca, the largest river is the Peace River with an average flow of 2161 m3/s. The Peace River originates in the Rocky Mountains of northern British Columbia and flows through northern Alberta and into the Slave River, Albertas capital city, Edmonton, is located approximately in the geographic centre of the province. It is the most northerly city in Canada, and serves as a gateway. The region, with its proximity to Canadas largest oil fields, has most of western Canadas oil refinery capacity, Calgary is located approximately 280 km south of Edmonton and 240 km north of Montana, surrounded by extensive ranching country. Almost 75% of the population lives in the Calgary–Edmonton Corridor. The land grant policy to the served as a means to populate the province in its early years
3.
Edmonton Metropolitan Region
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The ECRs commonly known boundaries are coincident with those of the Edmonton census metropolitan area as delineated by Statistics Canada. However, its boundaries are defined differently for Capital Region Board administrative purposes, the ECR is considered a major gateway to northern Alberta and the Canadian North, particularly for many companies, including airlines and oil/natural gas exploration. Located within central Alberta and at the end of the Calgary–Edmonton Corridor. The Edmonton CMA is the largest CMA in Canada by area at 9,426.73 km2, in the 2011 Census, it had a population of 1,159,869, making it the sixth largest CMA in Canada by population. The Edmonton CMA comprises the majority of Statistics Canadas Division No.11 in Alberta, a fragmentation in regional cooperation and partnership has long played a divisive role within the ECR. As a result, Premier Ed Stelmach announced in December 2007 that a governing board would be established for Edmontons Capital Region. Four months later, the Capital Region Board was formed with the passing of the Capital Region Board Regulation by Order in Council 127/2008 under the authority of the Municipal Government Act. The CRB was originally established with 25 participating or member municipalities –23 of which were within the Edmonton CMA and two of which were outside the CMA. The number of municipalities was reduced to 24 on September 10,2010 after the Village of New Sarepta dissolved to hamlet status under the jurisdiction of Leduc County on September 1,2010. Of the 35 census subdivisions within the Edmonton CMA, the Village of Spring Lake, in March,2010, Growing Forward, The Capital Region Growth Plan, consisting of individual plans for these four components and two addenda, was approved by the Government of Alberta. The CRGP includes a population and employment forecast for the Capital Region, with a base population of 1.12 million in 2009, the CRB has forecasted the population of the Capital Region to reach 1.31 million by 2019. However, the 2019 population estimate was reached and exceeded by 2014, the CRGP also designates priority growth areas and cluster country residential areas within the Capital Region. The following is a list of municipalities in the Edmonton Capital Region, the Town of Lamont, Lamont County and members of the CRB are indicated accordingly. ^ Strathcona Countys 2011 federal census population of 92,490 includes 64,733 in the Sherwood Park urban service area, ^ Strathcona Countys 2015 municipal census population of 95,597 includes 68,782 in Sherwood Park. ^ The combined Wabamun 133A and 133B population of 1,086 includes 1,069 in Wabamun 133A and 17 in Wabamun 133B, ^ Population including Lamont and Lamont County. At the moment, two major industrial areas are in the final stages of establishment. Calgary-Edmonton Corridor Calgary Region Capital Region Board Edmonton. com - Portal to Greater Edmonton EEDC - Edmonton Economic Development Corporation Edmontons International Region
4.
Call sign
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In broadcasting and radio communications, a call sign is a unique designation for a transmitter station. In North America, they are used for all FCC licensed transmitters, a call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a stations identity. The use of signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one line linking all railroad stations. In order to time, two-letter identifiers were adopted for this purpose. This pattern continued in operation, radio companies initially assigned two-letter identifiers to coastal stations and stations aboard ships at sea. These were not globally unique, so a company identifier was later added. Merchant and naval vessels are assigned call signs by their national licensing authorities, in the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters. United States merchant vessels are given call signs beginning with the letters W or K while US naval ships are assigned callsigns beginning with N, leisure craft with VHF radios may not be assigned call signs, in which case the name of the vessel is used instead. Ships in the US wishing to have a radio licence anyway are under F. C. C, class SA, Ship recreational or voluntarily equipped. Those calls follow the land mobile format of the initial letter K or W followed by 1 or 2 letters followed by 3 or 4 numbers. U. S. Coast Guard small boats have a number that is shown on both bows in which the first two digits indicate the length of the boat in feet. For example, Coast Guard 47021 refers to the 21st in the series of 47 foot motor lifeboats, the call sign might be abbreviated to the final two or three numbers during operations, for example, Coast Guard zero two one. Call signs in aviation are derived from several different policies, depending upon the type of flight operation, in most countries, unscheduled general aviation flights identify themselves using the call sign corresponding to the aircrafts registration number. In this case, the sign is spoken using the International Civil Aviation Organization phonetic alphabet. Aircraft registration numbers internationally follow the pattern of a country prefix, for example, an aircraft registered as N978CP conducting a general aviation flight would use the call sign November-niner-seven-eight-Charlie-Papa. However, in the United States a pilot of an aircraft would normally omit saying November, at times, general aviation pilots might omit additional preceding numbers and use only the last three numbers and letters. This is especially true at uncontrolled fields when reporting traffic pattern positions, for example, Skyhawk eight-Charlie-Papa, left base
5.
Canada
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Canada is a country in the northern half of North America. Canadas border with the United States is the worlds longest binational land border, the majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its territory being dominated by forest and tundra. It is highly urbanized with 82 per cent of the 35.15 million people concentrated in large and medium-sized cities, One third of the population lives in the three largest cities, Toronto, Montreal and Vancouver. Its capital is Ottawa, and other urban areas include Calgary, Edmonton, Quebec City, Winnipeg. Various aboriginal peoples had inhabited what is now Canada for thousands of years prior to European colonization. Pursuant to the British North America Act, on July 1,1867, the colonies of Canada, New Brunswick and this began an accretion of provinces and territories to the mostly self-governing Dominion to the present ten provinces and three territories forming modern Canada. With the Constitution Act 1982, Canada took over authority, removing the last remaining ties of legal dependence on the Parliament of the United Kingdom. Canada is a parliamentary democracy and a constitutional monarchy, with Queen Elizabeth II being the head of state. The country is officially bilingual at the federal level and it is one of the worlds most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Its advanced economy is the eleventh largest in the world, relying chiefly upon its abundant natural resources, Canadas long and complex relationship with the United States has had a significant impact on its economy and culture. Canada is a country and has the tenth highest nominal per capita income globally as well as the ninth highest ranking in the Human Development Index. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, Canada is an influential nation in the world, primarily due to its inclusive values, years of prosperity and stability, stable economy, and efficient military. While a variety of theories have been postulated for the origins of Canada. In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona, from the 16th to the early 18th century Canada referred to the part of New France that lay along the St. Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named The Canadas, until their union as the British Province of Canada in 1841. Upon Confederation in 1867, Canada was adopted as the name for the new country at the London Conference. The transition away from the use of Dominion was formally reflected in 1982 with the passage of the Canada Act, later that year, the name of national holiday was changed from Dominion Day to Canada Day
6.
Owned-and-operated station
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In the broadcasting industry, an owned-and-operated station usually refers to a television or radio station that is owned by the network with which it is associated. This distinguishes such a station from an affiliate, which is independently owned, the concept of an O&O is clearly defined in the United States and Canada, where network-owned stations had historically been the exception rather than the rule. In the broadcasting industry, the term owned-and-operated station refers exclusively to stations that are owned by television, on the other hand, the term affiliate only applies to stations that are not owned by networks, but instead are contracted to air programming from one of the major networks. The term station correctly applies to the ownership of the station, for example, a station that is owned and operated by the American Broadcasting Company is referred to as an ABC station or an ABC O&O, but normally should not be referred to as an affiliate. Likewise, a station not owned by ABC but contracted to air the networks programming is referred to as an ABC affiliate, that is. A correct formal phrasing could be, ABC affiliate WFAA is a Gannett station, some stations that are owned by companies that operate a network, but air another networks programming are referred to as an affiliate of the network that they carry. For example, WBFS-TV in Miami is owned by the CBS networks parent company CBS Corporation, prior to the September 2006 shutdown of the CBS-owned UPN television network, WBFS aired that networks programming, therefore, WBFS was a UPN O&O. The stations carrying The WB Television Network were another exception, the controlling shares in the network were held by Time Warner, with minority interests from the Tribune Company and, for a portion of networks existence, the now-defunct ACME Communications. While Tribune-owned stations such as WGN-TV in Chicago, WPIX in New York City and KTLA in Los Angeles aired programming from The WB, a similar exception existed when UPN launched in January 1995 by co-owners Chris-Craft and Viacom. Each of the owned a number of stations that aired the network. However, the stations were not considered O&Os under the initial standard definition. This ambiguity ended with Viacoms buyout of Chris-Crafts share of the network in 2000, the stations were referred to informally as UPN O&Os. Following the shutdowns of UPN and The WB, CBS Corporation, Entertainment became co-owners of the new CW Television Network, which largely merged the programming from both networks onto the scheduling model used by The WB. The network launched in September 2006 on 11 UPN stations owned by CBS Corporation, certain UPN and WB affiliates in markets where Tribune and CBS both owned stations carrying those networks either picked up a MyNetworkTV affiliation or became independent stations. The standard definition of an O&O again does not apply to The CW, in Australia, Seven Network, Nine Network and Network Ten each own and operate stations in the five largest metropolitan areas. These television markets together account for two thirds of the countrys population, in addition, Seven also owns and operates its local station in regional Queensland, and Nine owns and operates its station in Darwin. Nine also owns and operates NBN Television, based in Newcastle, the two national public broadcasters, the Australian Broadcasting Corporation and Special Broadcasting Service, own and operate all of their local stations. In Japan, commercial terrestrial television is focused on five organizations, the four largest of these – Nippon TV, Tokyo Broadcasting System, Fuji Television, and TV Asahi – each own and operate stations in the Tokyo, Keihanshin, Chukyo and Fukuoka metropolitan areas
7.
Fredericton
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Fredericton is the capital of the Canadian province of New Brunswick. The city is situated in the portion of the province along the Saint John River. One of the urban centres in New Brunswick, the city had a population of 56,224 in the 2011 census. It is the third-largest city in the province after Moncton and Saint John, the city hosts the annual Harvest Jazz & Blues Festival, attracting regional and international jazz, blues, rock, and world artists. Fredericton is also an important and vibrant center point for the regions top visual artists, many of New Brunswicks notable artists live, Fredericton has also been home to some great historical Canadian painters as well, including Goodridge Roberts, and Molly and Bruno Bobak. As a provincial capital, its economy is tied to the sector, however. The city has the highest percentage of residents with an education in the province. The earliest known inhabitation of the dates back 12,000 years, according to archaeologists. Excavations unearthed a campsite with firepit and more than 600 artifacts including stone tool fragments, the area of the present-day city of Fredericton was first used for seasonal farming by the Maliseet peoples. Maliseet cultivated food plants including, beans, pumpkins, Jerusalem artichokes, ground nuts, in the mid-18th century their principal village of Aucpaque was located several kilometres upriver from the site of present-day Fredericton. The first European contact was by the French in the late 17th century, Joseph Robineau de Villebon received a land grant and was appointed governor of Acadia. During King Williams War, Villebon built Fort Nashwaak on the side of the Saint John River. For most of the war, Fort Nashwaak served as the capital of the French colony of Acadia, French and English hostilities continued along the border. Within weeks of an attack of French and Indigenous forces launched from Fort Nashwaak on Pemaquid, Maine, in 1696, an expedition under command of Major Benjamin Church set out to destroy Fort Nashwaak. Commander Villebon had been alerted and prepared his defences, on 18 October, the British troops arrived near the fort, landed three cannons, and assembled earthworks on the south bank of the Nashwaak River. For two days gunfire was exchanged, with the advantage going to the better-sited Acadian guns. The New Englanders were defeated, with 8 soldiers killed and 17 wounded, the Acadians sustained losses of one killed and two wounded. After Villebons death in 1700 and a flood that destroyed several French farms in the area
8.
New Brunswick
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New Brunswick is one of Canadas three Maritime provinces and is the only constitutionally bilingual province. In the Canada 2016 Census, Statistics Canada estimated the population to have been 747,101, down very slightly from 751,171 in 2011. The majority of the population is English-speaking of Anglo and Celtic heritage and it was created as a result of the partitioning of the British colony of Nova Scotia in 1784 and was originally named New Ireland with the capital to be in Saint John. The name was replaced with New Brunswick by King George II. The provincial flag features a ship superimposed on a background with a yellow lion passant guardant on red pennon above it. The province is named for the city of Braunschweig, known in English and Low German as Brunswick, located in modern-day Lower Saxony in northern Germany. The then-colony was named in 1784 to honour the reigning British monarch, George III, the original First Nations inhabitants of New Brunswick were members of three distinct tribes. The largest tribe was the Mikmaq, and they occupied the eastern and they were responsible for the Augustine Mound, a burial ground built about 800 BCE near Metepnákiaq. The western portion of the province was the home of the Wolastoqiyik people. The smaller Passamaquoddy tribe occupied lands in the southwest of the province. The next French contact was in 1604, when a party led by Pierre du Gua de Monts and Samuel de Champlain set up camp for the winter on St. Croix Island, the colony relocated the following year across the Bay of Fundy to Port Royal, Nova Scotia. The whole maritime region was at that time claimed by France and was designated as the colony of Acadia, one of the provisions of the Treaty of Utrecht of 1713 was the surrender of Acadia to Queen Anne. The bulk of the Acadian population thus found themselves residing in the new British colony of Nova Scotia, the remainder of Acadia was only lightly populated and poorly defended. The Maliseet from their headquarters at Meductic on the Saint John River, participated in guerilla raids and battles against New England during Father Rales War. About 1750, to protect his interests in New France, Louis XV caused three forts to be built along the Isthmus of Chignecto and this caused what is known to historians as Father Le Loutres War. During the French and Indian War, the British completed their displacement of the Acadians over all of present-day New Brunswick, Fort Beauséjour, Fort Menagoueche and Fort Gaspareaux were captured by a British force commanded by Lt. Col. Robert Monckton in 1755. Inside Fort Beauséjour, the British forces found not only French regular troops, Governor Charles Lawrence of Nova Scotia used the discovery of Acadian civilians helping in the defence of the fort to order the expulsion of the Acadian population from Nova Scotia. The Acadians of the recently captured Beaubassin and Petitcodiac regions were included in the expulsion order, other actions in the war included British expeditions up the Saint John River in the St. John River Campaign
9.
Vancouver
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Vancouver is a coastal seaport city in Canada, located in the Lower Mainland region of British Columbia. As the most populous city in the province, the 2016 census recorded 631,486 people in the city, the Greater Vancouver area had a population of 2,463,431 in 2016, making it the third largest metropolitan area in Canada. Vancouver has the highest population density in Canada with over 5,400 people per square kilometre. With over 250,000 residents, Vancouver municipality is the fourth most densely populated city in North America behind New York City, San Francisco, and Mexico City according to the 2011 census. In that census, Vancouver was one of the most ethnically and linguistically diverse cities in Canada, Vancouver is classed as a Beta global city. In 2014, following thirty years in California, the annual TED conference made Vancouver its indefinite home, several matches of the 2015 FIFA Womens World Cup were played in Vancouver, including the final at BC Place Stadium. From that first enterprise, other stores and some hotels quickly appeared along the waterfront to the west, Gastown became formally laid out as a registered townsite dubbed Granville, B. I. As of 2014, Port Metro Vancouver is the third largest port by tonnage in the Americas, 27th in the world, the busiest and largest in Canada, and the most diversified port in North America. While forestry remains its largest industry, Vancouver is well known as an urban centre surrounded by nature, archaeological records indicate the presence of Aboriginal people in the Vancouver area from 8,000 to 10,000 years ago. The city is located in the territories of the Squamish, Musqueam. They had villages in various parts of present-day Vancouver, such as Stanley Park, False Creek, Kitsilano, Point Grey, the city takes its name from George Vancouver, who explored the inner harbour of Burrard Inlet in 1792 and gave various places British names. The explorer and North West Company trader Simon Fraser and his became the first known Europeans to set foot on the site of the present-day city. In 1808, they travelled from the east down the Fraser River, perhaps as far as Point Grey. The Fraser Gold Rush of 1858 brought over 25,000 men, mainly from California, to nearby New Westminster on the Fraser River, on their way to the Fraser Canyon, a sawmill established at Moodyville in 1863, began the citys long relationship with logging. It was quickly followed by mills owned by Captain Edward Stamp on the shore of the inlet. This mill, known as the Hastings Mill, became the nucleus around which Vancouver formed, the mills central role in the city waned after the arrival of the Canadian Pacific Railway in the 1880s. It nevertheless remained important to the economy until it closed in the 1920s. The settlement which came to be called Gastown grew up quickly around the original makeshift tavern established by Gassy Jack Deighton in 1867 on the edge of the Hastings Mill property
10.
University of Alberta
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The University of Alberta is a public research university located in Edmonton, Alberta, Canada. It was founded in 1908 by Alexander Cameron Rutherford, the first premier of Alberta and its enabling legislation is the Post-secondary Learning Act. The university comprises four campuses in Edmonton, the Augustana Campus in Camrose, the original north campus consists of 150 buildings covering 50 city blocks on the south rim of the North Saskatchewan River valley, directly across from downtown Edmonton. 39,000 students from Canada and 150 other countries participate in 400 programs in 18 faculties, the University of Alberta is a major economic driver in Alberta. The university’s impact on the Alberta economy is an estimated $12.3 billion annually, with more than 15,000 employees, the university is Albertas fourth-largest employer. According to the 2014 QS World University Rankings the top Faculty Area at the University of Alberta is Arts and Humanities, the University of Alberta is also a leading institution for the study of Ukraine and is home to the Canadian Institute of Ukrainian Studies. The university was modelled on the American state university, with an emphasis on extension work, the president, appointed by the board, was to provide a link between the two bodies and perform institutional leadership. Heated wrangling took place between the cities of Calgary and Edmonton over the location of the capital and of the university. It was stated that the capital would be north of the North Saskatchewan River, the city of Edmonton became the capital and the then-separate city of Strathcona on the south bank of the river, where Premier Alexander Rutherford lived, was granted the university. When the two cities were amalgamated in 1912, Edmonton became both the political and academic capital, with Henry Marshall Tory as its first president, the University of Alberta started operation in 1908. Under Torys guidance, the years were marked by recruitment of professors. Percy Erskine Nobbs & Frank Darling designed the plan for the University of Alberta in 1909–10. Nobbs designed the Arts Building, laboratories and Power House, with Cecil S. Burgess, Nobbs designed the Provincial College of Medicine. Architect Herbert Alton Magoon designed several buildings on campus, including St. Stephens Methodist College, the University of Alberta awarded its first degrees in 1912, the same year it established the Department of Extension. The Faculty of Medicine was established the year, and the Faculty of Agriculture began in 1915. Despite these setbacks, the university continued to grow, by 1920, it had six faculties and two schools. There were 851 male students and 251 female students, and 171 academic staff, in the early part of the 20th century, professional education expanded beyond the traditional fields of theology, law and medicine. Graduate training based on the German-inspired American model of specialized course work, in 1929, the university established a College of Education
11.
AM broadcasting
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AM broadcasting is the process of radio broadcasting using amplitude modulation. AM was the first method of impressing sound on a signal and is still widely used today. Commercial and public AM broadcasting is authorized in the wave band worldwide. Commercial AM broadcasting developed from amateur broadcasts around 1920, and was the commercially important form of radio broadcasting until FM broadcasting began after World War II. This period is known as the Golden Age of Radio, today, AM competes with FM, as well as with various digital radio broadcasting services distributed from terrestrial and satellite transmitters. AM broadcasting was the first broadcasting technology invented, the technology of amplitude modulation radio transmission was developed between 1900 and 1920. This was used for private communication and message traffic, such as telegrams. The entrepreneurs who developed AM radiotelephone transmission did not anticipate broadcasting voice, the term broadcasting, borrowed from agriculture, was applied to this new activity around 1920. Prior to 1920 there was no concept of broadcasting, or that radio listeners could be a market for entertainment. Although there were a number of broadcasts during this period. True radio broadcasting didnt begin until around 1920, when it sprang up spontaneously among amateur stations, AM remained the dominant method of broadcasting for the next 30 years, a period called the Golden Age of Radio, until FM broadcasting started to become widespread in the 1950s. AM remains a popular, profitable entertainment medium today and the dominant form of broadcasting in some such as Australia. The first AM voice transmission was made by Canadian researcher Reginald Fessenden on 23 December 1900, Fessenden is a significant figure in the development of AM radio. He helped develop one of the first – the Alexanderson alternator, the first practical continuous wave AM transmitters were based on versions of the Poulsen arc transmitter invented in 1903, and the huge, expensive Alexanderson alternator, developed 1906–1910. The modifications necessary to transmit AM were clumsy and resulted in low audio quality. Modulation was usually accomplished by a carbon microphone inserted directly in the antenna wire, the limited power handling ability of the microphone severely limited the power of the first radiotelephones, in powerful transmitters water-cooled microphones had to be used. At the receiving end, the crystal radio receivers then in use could not drive loudspeakers, only earphones. The discovery in 1912 of the ability of the Audion vacuum tube, invented in 1906 by Lee De Forest
12.
Frequency
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Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as frequency, which emphasizes the contrast to spatial frequency. The period is the duration of time of one cycle in a repeating event, for example, if a newborn babys heart beats at a frequency of 120 times a minute, its period—the time interval between beats—is half a second. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as vibrations, audio signals, radio waves. For cyclical processes, such as rotation, oscillations, or waves, in physics and engineering disciplines, such as optics, acoustics, and radio, frequency is usually denoted by a Latin letter f or by the Greek letter ν or ν. For a simple motion, the relation between the frequency and the period T is given by f =1 T. The SI unit of frequency is the hertz, named after the German physicist Heinrich Hertz, a previous name for this unit was cycles per second. The SI unit for period is the second, a traditional unit of measure used with rotating mechanical devices is revolutions per minute, abbreviated r/min or rpm. As a matter of convenience, longer and slower waves, such as ocean surface waves, short and fast waves, like audio and radio, are usually described by their frequency instead of period. Spatial frequency is analogous to temporal frequency, but the axis is replaced by one or more spatial displacement axes. Y = sin = sin d θ d x = k Wavenumber, in the case of more than one spatial dimension, wavenumber is a vector quantity. For periodic waves in nondispersive media, frequency has a relationship to the wavelength. Even in dispersive media, the frequency f of a wave is equal to the phase velocity v of the wave divided by the wavelength λ of the wave. In the special case of electromagnetic waves moving through a vacuum, then v = c, where c is the speed of light in a vacuum, and this expression becomes, f = c λ. When waves from a monochrome source travel from one medium to another, their remains the same—only their wavelength. For example, if 71 events occur within 15 seconds the frequency is, the latter method introduces a random error into the count of between zero and one count, so on average half a count. This is called gating error and causes an error in the calculated frequency of Δf = 1/, or a fractional error of Δf / f = 1/ where Tm is the timing interval. This error decreases with frequency, so it is a problem at low frequencies where the number of counts N is small, an older method of measuring the frequency of rotating or vibrating objects is to use a stroboscope
