1.
Las Cruces, New Mexico
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Las Cruces, also known as The City of the Crosses, is the seat of Doña Ana County, New Mexico, United States. As of the 2010 census the population was 97,618, Las Cruces is the largest city in both Doña Ana County and southern New Mexico. The Las Cruces metropolitan area had an population of 213,676 in 2014. It is the city of a metropolitan statistical area which encompasses all of Doña Ana County and is part of the larger El Paso–Las Cruces combined statistical area. Las Cruces is the economic and geographic center of the Mesilla Valley, Las Cruces is the home of New Mexico State University, New Mexicos only land-grant university. The citys major employer is the government on nearby White Sands Test Facility. The Organ Mountains,10 miles to the east, are dominant in the landscape, along with the Doña Ana Mountains, Robledo Mountains. Las Cruces lies 225 miles south of Albuquerque,48 miles northwest of El Paso, spaceport America, which lies 55 miles to the north and with corporate offices in Las Cruces, has seen the completion of several successful manned, suborbital flights. The city is also the headquarters for Virgin Galactic, the worlds first company to offer sub-orbital spaceflights, the area where Las Cruces rose was previously inhabited by the Manso people, with the Mescalero Apache living nearby. The area remained under New Spains control until September 28,1821, the area was also claimed by the Republic of Texas during this time until the end of the Mexican–American War in 1846–48. The Treaty of Guadalupe Hidalgo in 1848 established the United States as owner of this territory, Mesilla became the leading settlement of the area, with more than 2,000 residents in 1860, more than twice what Las Cruces had. The first train reached Las Cruces in 1881, Las Cruces was not affected as strongly by the train as some other villages, as it was not a terminus or a crossroads, but the population did grow to 2,300 in the 1880s. Las Cruces was incorporated as a town in 1907, pat Garrett is best known for his involvement in the Lincoln County War, but he also worked in Las Cruces on a famous case, the disappearance of Albert Jennings Fountain in 1896. Growth of Las Cruces has been attributed to the university, government jobs, New Mexico State University was founded in 1888, and it has grown as Las Cruces has grown. The establishment of White Sands Missile Range in 1944 and White Sands Test Facility in 1963 has been integral to population growth, Las Cruces is the nearest city to each, and they provide Las Cruces work force many high-paying, stable, government jobs. In recent years, the influx of retirees from out of state has also increased Las Cruces population, in the 1960s Las Cruces undertook a large urban renewal project, intended to convert the old downtown into a modern city center. As part of this, St. Genevieves Catholic Church, built in 1859, was razed to make way for a pedestrian mall. The original covered walkways are now being removed in favor of a traditional main street thoroughfare
2.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located 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, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
3.
Digital terrestrial television
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Digital terrestrial television is a technological evolution of broadcast television and an advancement over analog television. A terrestrial implementation of digital television uses a aerial to broadcast to a conventional television antenna instead of a satellite dish or cable television connection. The amount of data that can be transmitted is directly affected by channel capacity, the modulation method in DVB-T is COFDM with either 64 or 16-state Quadrature Amplitude Modulation. In general, a 64QAM channel is capable of transmitting a bit rate. 16 and 64QAM constellations can be combined in a single multiplex, the DVB-T standard is not used for terrestrial digital television in North America. Instead, the ATSC standard calls for 8VSB modulation, which has similar characteristics to the vestigial sideband modulation used for analog television. This provides considerably more immunity to interference, but is not immune — as DVB-T is — to multipath distortion, both systems use the MPEG transport stream and H. 262/MPEG-2 Part 2 video codec specified in MPEG-2, they differ significantly in how related services are encoded. DTTV is received either via a digital set-top box, TV gateway or integrated tuner included with television sets, some set-top-boxes and TV gateways include digital video recorder functionality. This is quite common in the UK, see external links, indoor aerials are even more likely to be affected by these issues and possibly need replacing. Main articles, List of digital television deployments by country, Digital television transition Afghanistan started digital transmissions in MPEG-4 on Sunday,31 August 2014, Afghanistan adopted DVB-T2 system for digital television. India adopted DVB-T system for television in July 1999. The first DVB-T transmission was started on 26 January 2003 in the four metropolitan cities by Doordarshan. Currently the terrestrial transmission is available in digital and analog formats. 4 high power DVB-T transmitters were set up in the top 4 cities, an additional 190 high power, and 400 low power DVB-T2 transmitters have been approved for Tier I, II and III cities of the country by 2017. The Indian telecom regulator, TRAI, had recommended the I&B to allow private broadcast companies to use the DTT technology, so far, the Indian I&B ministry only permits private broadcast companies to use satellite, cable and IPTV based systems. Israel started digital transmissions in MPEG-4 on Sunday,2 August 2009, Israel was the first nation in the Middle East and the first non-European nation to shut down its analogue TV distribution system. The new service which is operated by the Second Authority for Radio, according to government decisions, the system will expand to include two additional multiplexes that will carry new channels and HD versions of the existing channels. In this matter nothing has been decided upon until the end on 2012, on 20 March 2013 it was announced that Thomson Broadcast had won a major contract with The Second Authority for Television and Radio for the extension of its nationwide DVB-T/DVB-T2 network
4.
Ultra high frequency
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Ultra high frequency is the ITU designation for radio frequencies in the range between 300 MHz and 3 GHz, also known as the decimetre band as the wavelengths range from one meter to one decimetre. Radio waves with frequencies above the UHF band fall into the 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, the IEEE defines the UHF radar band as frequencies between 300 MHz and 1 GHz. Two other IEEE radar bands overlap the ITU UHF band, the L band between 1 and 2 GHz and the S band between 2 and 4 GHz. Radio waves in the UHF band travel almost entirely by propagation and ground reflection, there is very little reflection from the ionosphere. They are blocked by hills and cannot travel far beyond the horizon, atmospheric moisture reduces, or attenuates, the strength of UHF signals over long distances, and the attenuation increases with frequency. UHF TV signals are generally more degraded by moisture than lower bands, occasionally when conditions are right, UHF radio waves can travel long distances by tropospheric ducting as the atmosphere warms and cools throughout the day. The length of an antenna is related to the length of the radio waves used, the UHF antenna is stubby and short, at UHF frequencies a quarter-wave monopole, the most common omnidirectional antenna is between 2.5 and 25 cm long for example. UHF is widely used in telephones, cell phones, walkie-talkies and other two-way radio systems from short range up to the visual horizon. Their transmissions do not travel far, allowing frequency reuse, public safety, business communications and personal radio services such as GMRS, PMR446, and UHF CB are often found on UHF frequencies as well as IEEE802.11 wireless LANs. The widely adapted GSM and UMTS cellular networks use UHF cellular frequencies, radio repeaters are used to retransmit UHF signals when a distance greater than the line of sight is required. Omnidirectional UHF antennas used on mobile devices are usually short whips, higher gain omnidirectional UHF antennas can be made of collinear arrays of dipoles and are used for mobile base stations and cellular base station antennas. The short wavelengths also allow high gain antennas to be conveniently small, high gain antennas for point-to-point communication links and UHF television reception are usually Yagi, log periodic, corner reflectors, or reflective array antennas. At the top end of the band slot antennas and parabolic dishes become practical, for television broadcasting specialized vertical radiators that are mostly modifications of the slot antenna or helical antenna are used, the slotted cylinder, zig-zag, and panel antennas. UHF television broadcasting fulfilled the demand for additional over-the-air television channels in urban areas, today, much of the bandwidth has been reallocated to land mobile, trunked radio and mobile telephone use. UHF channels are used for digital television. UHF spectrum is used worldwide for mobile radio systems for commercial, industrial, public safety. Many personal radio services use frequencies allocated in the UHF band, major telecommunications providers have deployed voice and data cellular networks in UHF/VHF range
5.
Program and System Information Protocol
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PSIP defines virtual channels and content ratings, as well as electronic program guides with titles and descriptions to be decoded and displayed by the ATSC tuner. PSIP can also send, the exact time referenced to UTC and GPS time, the short name, a maximum of seven characters can be used in a short name. PSIP is defined in ATSC standard A/65, the most recent revision of which is A/65,2013, a/69 is a recommended practice for implementing PSIP in a television station. PSIP also supersedes the A/55 and A/56 protocol methods of delivering program guide information, PSIP information may be passed through the airchain using proprietary protocols or through use of the XML-based Programming Metadata Communication Protocol facility metadata scheme. S
6.
PBS
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The Public Broadcasting Service is an American public broadcaster and television program distributor. PBS is funded by member dues, the Corporation for Public Broadcasting, government agencies, corporations, foundations. All proposed funding is subjected to a set of standards to ensure the program is free of influence from the funding source, since the mid-2000s, Roper polls commissioned by PBS have consistently placed the service as the most-trusted national institution in the United States. This arbitrary distinction is a frequent source of viewer confusion and it also operates National Datacast, a subsidiary which offers datacasting services via member stations, and provides additional revenue for PBS and its member stations. In 1973, it merged with Educational Television Stations, each station is charged with the responsibility of programming local content for their individual market or state that supplements content provided by PBS and other public television distributors. By contrast, PBS member stations pay fees for the acquired and distributed by the national organization. Under this relationship, PBS member stations have greater latitude in local scheduling than their commercial broadcasting counterparts, scheduling of PBS-distributed series may vary greatly depending on the market. This can be a source of tension as stations seek to preserve their localism, however, PBS has a policy of common carriage, which requires most stations to clear the national prime time programs on a common programming schedule to market them nationally more effectively. Management at former Los Angeles member KCET cited unresolvable financial and programming disputes among its reasons for leaving PBS after over 40 years in January 2011. Most PBS stations timeshift some distributed programs, once PBS accepts a program offered for distribution, PBS, rather than the originating member station, retains exclusive rebroadcasting rights during an agreed period. Suppliers retain the right to sell the program in non-broadcast media such as DVDs, books, in 1991, the Corporation for Public Broadcasting resumed production for most PBS shows that debuted prior to 1977, with the exceptions of Washington Week in Review and Wall Street Week. In 1994, The Chronicle of Philanthropy released the results of the largest study on the popularity and credibility of charitable, the strategy began that fall, with the intent to expand the in-program breaks to the remainder of the schedule if successful. In 2011, PBS released apps for iOS and Android to allow viewing of videos on mobile devices. An update in 2015 added Chromecast support, PBS initially struggled to compete with online media such as YouTube for market share. In a 2012 speech to 850 top executives from PBS stations, in the speech, later described as a “seminal moment” for public television, he laid out his vision for a new style of PBS digital video production. Station leadership rallied around his vision and Seiken formed PBS Digital Studios, which began producing educational but edgy videos, something Seiken called “PBS-quality with a YouTube sensibility. ”The studio’s first hit, in 2012, PBS began organizing much of its prime time programming around a genre-based schedule. PBS broadcasts childrens programming as part of the morning and afternoon schedule. Unlike its radio counterpart, National Public Radio, PBS does not have a program production arm or news division
