Retro Television Network
The Retro Television Network is an American broadcast television network, owned by Luken Communications. The network airs classic television sitcoms and drama series from the 1950s through the 1980s, although it includes more recent programs from the 1990s and 2000s. Through its ownership by Luken, Retro is a sister network to several broadcast network properties that are wholly or jointly owned by the company, including the family-oriented Family Channel and country music-oriented network Heartland. At its outset, Retro was designed to be broadcast on the digital subchannels of television stations; the network is available nationwide on free-to-air C-band satellite via SES-2 in DVB-S2 format. The Retro Television Network launched in July 2005 on select television stations owned by the Equity Broadcasting Corporation, a chain of small satellite-fed UHF television stations controlled directly from Equity's headquarters in Little Rock, Arkansas. Equity had expanded with purchases of many small stations in the early 2000s, but by 2008, the company was struggling to meet its obligations.
In June 2008, while the company was undergoing financial troubles, Equity Media Holdings sold RTN to Henry Luken III's – Equity's former president and CEO, the company's largest shareholder – Luken Communications for $18.5 million in cash. Equity had an option to repurchase the network for $27.75 million. Equity had filed for Chapter 11 bankruptcy three weeks before the expiration of the purchase option. On January 4, 2009, a contract conflict between Equity and Luken Communications interrupted RTN programming on many of its affiliates with Luken alleging that Equity had left many obligations to RTN's creditors, including programming suppliers, unpaid; as a result, Luken restored a national feed of the network from its Chattanooga headquarters with individual feeds to affiliates not owned by Equity following suit on a piecemeal basis. Equity-owned or -operated stations lost RTN affiliation, though Luken vowed to find new affiliates for the network in the affected areas; the Retro Television Network changed its on-air branding to "RTV" in June 2009.
In 2012, RTV dropped from 120 to 80 affiliates with many ABC affiliates switching to the Live Well Network. Further affiliate drops occurred as RTV's scheduling began to decline with lesser product, with MeTV and Antenna TV making major carriage deals with large broadcast groups. In March 2017, the final "major" group carrying the network, Sinclair Broadcast Group, dropped the network from three remaining Sinclair stations where RTV affiliation agreements were made with their former owners, replacing it with their in-house network TBD. On October 1, 2017, the network lost its last station with one of the "Big Five" networks, WKTC in Columbia, South Carolina, which replaced its subchannel with Laff; the network was re-branded as RetroTV in 2013. Of the top 25 digital broadcast networks for 2014, Retro TV ranked No. 10 with a coverage of 54% of households. Since its creation, Retro's principal programming concept consists of classic television series maintaining a 24-hour schedule of shows dating from the 1950s to the early 1990s along with seen older programming.
There have been some deviations to the format, including during the network's ownership under Equity, which added some original talk programming during the late night slot on weeknights from the summer of 2008 to early 2009, a concept billed as "Classic Hits All Day & Fresh Talk All Night". Overnights eventually became devoted to paid programming; the network has featured produced horror film showcases such as Wolfman Mac's Chiller Drive-In and Off Beat Cinema. Until 2011, Retro offered a customized schedule for use at the discretion of the local affiliate; the network moved towards a set national schedule, although affiliates have the option to pre-empt or reschedule some network programming. By June 2011, when Retro's distribution agreement with NBCUniversal Television Distribution ended, the network adjusted its schedule to feature programming from other distributors and public domain programs, as well as low-cost Canadian barter programs and reality and documentary programming. Retro featured a Saturday morning block of vintage cartoon programming.
In 2014, Retro began broadcasting Mystery Science Theater 3000, the soap opera The Doctors, the classic era of long-running British
Ultra high frequency
Ultra high frequency is the ITU designation for radio frequencies in the range between 300 megahertz and 3 gigahertz 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 or microwave frequency range. Lower frequency signals fall into lower bands. UHF radio waves propagate by line of sight, they are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, numerous other applications. The IEEE defines the UHF radar band as frequencies between 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 entirely by line-of-sight propagation and ground reflection. UHF radio waves are blocked by hills and cannot travel far beyond the horizon, but can penetrate foliage and buildings for indoor reception.
Since the wavelengths of UHF waves are comparable to the size of buildings, trees and other common objects and diffraction from these objects can cause fading due to multipath propagation in built-up urban areas. Atmospheric moisture reduces, or attenuates, the strength of UHF signals over long distances, the attenuation increases with frequency. UHF TV signals are more degraded by moisture than lower bands, such as VHF TV signals. Since UHF transmission is limited by the visual horizon to 30–40 miles and to shorter distances by local terrain, it allows the same frequency channels to be reused by other users in neighboring geographic areas. Public safety, business communications and personal radio services such as GMRS, PMR446, UHF CB are found on UHF frequencies as well as IEEE 802.11 wireless LANs. The adopted 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; 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. Due to the short wavelengths, UHF antennas are conveniently short. UHF wavelengths are short enough that efficient transmitting antennas are small enough to mount on handheld and mobile devices, so these frequencies are used for two way land mobile radio systems, such as walkie-talkies, two way radios in vehicles, for portable wireless devices. Omnidirectional UHF antennas used on mobile devices are short whips, sleeve dipoles, rubber ducky antennas or the planar inverted F antenna used in cellphones. 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 allow high gain antennas to be conveniently small. High gain antennas for point-to-point communication links and UHF television reception are Yagi, log periodic, corner reflectors, or reflective array antennas. At the top end of the band slot antennas and parabolic dishes become practical.
For satellite communication and turnstile antennas are used since satellites employ circular polarization, not sensitive to the relative orientation of the transmitting and receiving antennas. For television broadcasting specialized vertical radiators that are modifications of the slot antenna or reflective array antenna are used: the slotted cylinder, zig-zag, 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 still used for digital television. UHF spectrum is used worldwide for land mobile radio systems for commercial, public safety, military purposes. Many personal radio services use frequencies allocated in the UHF band, although exact frequencies in use differ between countries. Major telecommunications providers have deployed voice and data cellular networks in UHF/VHF range; this allows mobile phones and mobile computing devices to be connected to the public switched telephone network and public Internet.
UHF radars are said to be effective at tracking stealth fighters, if not stealth bombers. UHF citizens band: 476–477 MHz Television broadcasting uses UHF channels between 503 and 694 MHz Fixed point-to-point Link 450.4875 - 451.5125 MHz Land mobile service 457.50625 - 459.9875 MHz Mobile satellite service: 406.0000 - 406.1000 MHz Segment and Service examples: Land mobile for private, Australian and Territory Government, Rail industry and Mobile-Satellite 430–450 MHz: Amateur radio 470–806 MHz: Terrestrial television 1452–1492 MHz: Digital Audio Broadcasting Many other frequency assignments for Canada and Mexico are similar to their US counterparts 380–399.9 MHz: Terrestrial Trunked Radio service for emergency use 430–440 MHz: Amateur ra
Kentucky the Commonwealth of Kentucky, is a state located in the east south-central region of the United States. Although styled as the "State of Kentucky" in the law creating it, Kentucky is one of four U. S. states constituted as a commonwealth. A part of Virginia, in 1792 Kentucky became the 15th state to join the Union. Kentucky is the 26th most populous of the 50 United States. Kentucky is known as the "Bluegrass State", a nickname based on the bluegrass found in many of its pastures due to the fertile soil. One of the major regions in Kentucky is the Bluegrass Region in central Kentucky, which houses two of its major cities and Lexington, it is a land with diverse environments and abundant resources, including the world's longest cave system, Mammoth Cave National Park, the greatest length of navigable waterways and streams in the contiguous United States, the two largest man-made lakes east of the Mississippi River. Kentucky is known for horse racing, bourbon distilleries, coal, the "My Old Kentucky Home" historic state park, automobile manufacturing, bluegrass music, college basketball, Kentucky Fried Chicken.
In 1776, the counties of Virginia beyond the Appalachian Mountains became known as Kentucky County, named for the Kentucky River. The precise etymology of the name is uncertain, but based on an Iroquoian name meaning " the meadow" or " the prairie". Others have put forth the possibility of Kenta Aki, which would come from Algonquian language and, would have derived from the Shawnees. Folk etymology states that this translates as "Land of Our Fathers." The closest approximation in another Algonquian language, Ojibwe translates it more-so to "Land of Our In-Laws", thus making a fairer English translation "The Land of Those Who Became Our Fathers." In any case, the word aki comes out as land in all Algonquian languages. Kentucky is situated in the Upland South. A significant portion of eastern Kentucky is part of Appalachia. Kentucky borders seven states, from the Southeast. West Virginia lies to the east, Virginia to the southeast, Tennessee to the south, Missouri to the west and Indiana to the northwest, Ohio to the north and northeast.
Only Missouri and Tennessee, both of which border eight states, touch more. Kentucky's northern border is formed by the Ohio River and its western border by the Mississippi River. However, the official border is based on the courses of the rivers as they existed when Kentucky became a state in 1792. For instance, northbound travelers on U. S. 41 from Henderson, after crossing the Ohio River, will be in Kentucky for about two miles. Ellis Park, a thoroughbred racetrack, is located in this small piece of Kentucky. Waterworks Road is part of the only land border between Kentucky. Kentucky has a non-contiguous part known at the far west corner of the state, it exists as an exclave surrounded by Missouri and Tennessee, is included in the boundaries of Fulton County. Road access to this small part of Kentucky on the Mississippi River requires a trip through Tennessee; the epicenter of the powerful 1811–12 New Madrid earthquakes was near this area causing the river to flow backwards in some places. Though the series of quakes did change the area geologically and affect the inhabitants of the area at the time, the Kentucky Bend was formed because of a surveying error, not the New Madrid earthquake.
Kentucky can be divided into five primary regions: the Cumberland Plateau in the east, the north-central Bluegrass region, the south-central and western Pennyroyal Plateau, the Western Coal Fields and the far-west Jackson Purchase. The Bluegrass region is divided into two regions, the Inner Bluegrass—the encircling 90 miles around Lexington—and the Outer Bluegrass—the region that contains most of the northern portion of the state, above the Knobs. Much of the outer Bluegrass is in the Eden Shale Hills area, made up of short and narrow hills; the Jackson Purchase and western Pennyrile are home to several bald cypress/tupelo swamps. Located within the southeastern interior portion of North America, Kentucky has a climate that can best be described as a humid subtropical climate, only small higher areas of the southeast of the state has an oceanic climate influenced by the Appalachians. Temperatures in Kentucky range from daytime summer highs of 87 °F to the winter low of 23 °F; the average precipitation is 46 inches a year.
Kentucky experiences four distinct seasons, with substantial variations in the severity of summer and winter. The highest recorded temperature was 114 °F at Greensburg on July 28, 1930 while the lowest recorded temperature was −37 °F at Shelbyville on January 19, 1994, it has four distinct seasons, but experiences the extreme cold as far northern states, nor the high heat of the states in the Deep South. Temperatures seldom drop below 0 degrees or rise above 100 degrees. Rain and snowfall totals about 45 inches per year. There are big variations in climate within the state; the northern parts tend to be about 5 degrees cooler than those in western parts of the state. Somerset in the south-central part receives 10 more inches of rain per year than, for instance, Covington to the north. Average temperatures for the entire Commonwe
Aspect ratio (image)
The aspect ratio of an image describes the proportional relationship between its width and its height. It is expressed as two numbers separated by a colon, as in 16:9. For an x:y aspect ratio, no matter how big or small the image is, if the width is divided into x units of equal length and the height is measured using this same length unit, the height will be measured to be y units. For example, in a group of images that all have an aspect ratio of 16:9, one image might be 16 inches wide and 9 inches high, another 16 centimeters wide and 9 centimeters high, a third might be 8 yards wide and 4.5 yards high. Thus, aspect ratio concerns the relationship of the width to the height, not an image's actual size; the most common aspect ratios used today in the presentation of films in cinemas are 1.85:1 and 2.39:1. Two common videographic aspect ratios are 4:3, the universal video format of the 20th century, 16:9, universal for high-definition television and European digital television. Other cinema and video aspect ratios are used infrequently.
In still camera photography, the most common aspect ratios are 4:3, 3:2, more found in consumer cameras, 16:9. Other aspect ratios, such as 5:3, 5:4, 1:1, are used in photography as well in medium format and large format. With television, DVD and Blu-ray Disc, converting formats of unequal ratios is achieved by enlarging the original image to fill the receiving format's display area and cutting off any excess picture information, by adding horizontal mattes or vertical mattes to retain the original format's aspect ratio, by stretching the image to fill the receiving format's ratio, or by scaling by different factors in both directions scaling by a different factor in the center and at the edges. In motion picture formats, the physical size of the film area between the sprocket perforations determines the image's size; the universal standard is a frame, four perforations high. The film itself is 35 mm wide, but the area between the perforations is 24.89 mm × 18.67 mm, leaving the de facto ratio of 4:3, or 1.3:1.
With a space designated for the standard optical soundtrack, the frame size reduced to maintain an image, wider than tall, this resulted in the Academy aperture of 22 mm × 16 mm or 1.375:1 aspect ratio. The motion picture industry convention assigns a value of 1.0 to the image's height. After 1952, a number of aspect ratios were experimented with for anamorphic productions, including 2.66:1 and 2.55:1. A SMPTE specification for anamorphic projection from 1957 standardized the aperture to 2.35:1. An update in 1970 changed the aspect ratio to 2.39:1. This aspect ratio of 2.39:1 was confirmed by the most recent revision from August 1993. In American cinemas, the common projection ratios are 1.85:1 and 2.39:1. Some European countries have 1.6:1 as the wide screen standard. The "Academy ratio" of 1.375:1 was used for all cinema films in the sound era until 1953. During that time, which had a similar aspect ratio of 1.3:1, became a perceived threat to movie studios. Hollywood responded by creating a large number of wide-screen formats: CinemaScope, Todd-AO, VistaVision to name just a few.
The "flat" 1.85:1 aspect ratio was introduced in May 1953, became one of the most common cinema projection standards in the U. S. and elsewhere. The goal of these various lenses and aspect ratios was to capture as much of the frame as possible, onto as large an area of the film as possible, in order to utilize the film being used; some of the aspect ratios were chosen to utilize smaller film sizes in order to save film costs while other aspect ratios were chosen to use larger film sizes in order to produce a wider higher resolution image. In either case the image was squeezed horizontally to fit the film's frame size and avoid any unused film area. Development of various film camera systems must cater to the placement of the frame in relation to the lateral constraints of the perforations and the optical soundtrack area. One clever wide screen alternative, VistaVision, used standard 35 mm film running sideways through the camera gate, so that the sprocket holes were above and below frame, allowing a larger horizontal negative size per frame as only the vertical size was now restricted by the perforations.
There were a limited number of projectors constructed to run the print-film horizontally. However, the 1.50:1 ratio of the initial VistaVision image was optically converted to a vertical print to show with the standard projectors available at theaters, was masked in the projector to the US standard of 1.85:1. The format was revived by Lucasfilm in the late 1970s for special effects work that required larger negative size, it went into obsolescence due to better cameras and film stocks available to standard four-perforation formats, in addition to increased lab costs of making prints in comparison to more standard vertical processes. Super 16 mm film was used for televisi
Federal Communications Commission
The Federal Communications Commission is an independent agency of the United States government created by statute to regulate interstate communications by radio, wire and cable. The FCC serves the public in the areas of broadband access, fair competition, radio frequency use, media responsibility, public safety, homeland security; the FCC was formed by the Communications Act of 1934 to replace the radio regulation functions of the Federal Radio Commission. The FCC took over wire communication regulation from the Interstate Commerce Commission; the FCC's mandated jurisdiction covers the 50 states, the District of Columbia, the Territories of the United States. The FCC provides varied degrees of cooperation and leadership for similar communications bodies in other countries of North America; the FCC is funded by regulatory fees. It has an estimated fiscal-2016 budget of US $388 million, it has 1,688 federal employees, made up of 50% males and 50% females as of December, 2017. The FCC's mission, specified in Section One of the Communications Act of 1934 and amended by the Telecommunications Act of 1996 is to "make available so far as possible, to all the people of the United States, without discrimination on the basis of race, religion, national origin, or sex, efficient and world-wide wire and radio communication services with adequate facilities at reasonable charges."
The Act furthermore provides that the FCC was created "for the purpose of the national defense" and "for the purpose of promoting safety of life and property through the use of wire and radio communications."Consistent with the objectives of the Act as well as the 1999 Government Performance and Results Act, the FCC has identified four goals in its 2018-22 Strategic Plan. They are: Closing the Digital Divide, Promoting Innovation, Protecting Consumers & Public Safety, Reforming the FCC's Processes; the FCC is directed by five commissioners appointed by the President of the United States and confirmed by the United States Senate for five-year terms, except when filling an unexpired term. The U. S. President designates one of the commissioners to serve as chairman. Only three commissioners may be members of the same political party. None of them may have a financial interest in any FCC-related business. † Commissioners may continue serving until the appointment of their replacements. However, they may not serve beyond the end of the next session of Congress following term expiration.
In practice, this means that commissioners may serve up to 1 1/2 years beyond the official term expiration dates listed above if no replacement is appointed. This would end on the date that Congress adjourns its annual session no than noon on January 4; the FCC is organized into seven Bureaus, which process applications for licenses and other filings, analyze complaints, conduct investigations and implement regulations, participate in hearings. The Consumer & Governmental Affairs Bureau develops and implements the FCC's consumer policies, including disability access. CGB serves as the public face of the FCC through outreach and education, as well as through their Consumer Center, responsible for responding to consumer inquiries and complaints. CGB maintains collaborative partnerships with state and tribal governments in such areas as emergency preparedness and implementation of new technologies; the Enforcement Bureau is responsible for enforcement of provisions of the Communications Act 1934, FCC rules, FCC orders, terms and conditions of station authorizations.
Major areas of enforcement that are handled by the Enforcement Bureau are consumer protection, local competition, public safety, homeland security. The International Bureau develops international policies in telecommunications, such as coordination of frequency allocation and orbital assignments so as to minimize cases of international electromagnetic interference involving U. S. licensees. The International Bureau oversees FCC compliance with the international Radio Regulations and other international agreements; the Media Bureau develops and administers the policy and licensing programs relating to electronic media, including cable television, broadcast television, radio in the United States and its territories. The Media Bureau handles post-licensing matters regarding direct broadcast satellite service; the Wireless Telecommunications Bureau regulates domestic wireless telecommunications programs and policies, including licensing. The bureau implements competitive bidding for spectrum auctions and regulates wireless communications services including mobile phones, public safety, other commercial and private radio services.
The Wireline Competition Bureau develops policy concerning wire line telecommunications. The Wireline Competition Bureau's main objective is to promote growth and economical investments in wireline technology infrastructure, development and services; the Public Safety and Homeland Security Bureau was launched in 2006 with a focus on critical communications infrastructure. The FCC has eleven Staff Offices; the FCC's Offices provide support services to the Bureaus. The Office of Administrative Law Judges is responsible for conducting hearings ordered by the Commission; the hearing function includes acting on interlocutory requests filed in the proceedings such as petitions to intervene, petitions to enlarge issues, contested discovery requests. An Administrative Law Judge, appointed under the Administrative Procedure Act, presides at the hearing during which documents and sworn testimony are received in evidence, witnesses are cross-examined. At the co
Low-power broadcasting refers to a broadcast station operating at a low electrical power to a smaller service area than "full power" stations within the same region, but distinguished from "micropower broadcasting" and broadcast translators. LPAM, LPFM and LPTV are in various levels of use across the world, varying based on the laws and their enforcement. Radio communications in Canada are regulated by the Radio Communications and Broadcasting Regulatory Branch, a branch of Industry Canada, in conjunction with the Canadian Radio-television and Telecommunications Commission. Interested parties must apply for both a certificate from Industry Canada and a license from CRTC in order to operate a radio station. Industry Canada manages the technicalities of spectrum space and technological requirements whereas content regulation is conducted more so by CRTC. LPFM is broken up into two classes in Canada and Very Low; the transmitters therefore range from 1 to 50 watts, as opposed to 1 to 100 watts in the U.
S. As of 2000, 500 licenses have been issued; these transmitters are only allowed in remote areas. Stations in the low-power class are subject to the same CRTC licensing requirements, will follow the same call sign format, as full-power stations. Stations in the low-power class had to have CRTC licenses as well, although a series of CRTC regulation changes in the early 2000s exempted most such stations from licensing; the regulation of spectrum space is strict in Canada, as well having restrictions on second and third adjacent channels, along with other protections for AM and FM commercial radio. In addition, because there have been a few cases that found that FM frequencies have caused interference to the aeronautical navigation and communications spectrum, pirate radio regulation has remained strict as well. However, the two regulating bodies do have certain exemptions. For example, low-power announcement transmitters that meet the requirement of Broadcasting Equipment Technical Standards 1, Limited Duration Special Events Distribution Undertakings, Temporary Resource Development Distribution Undertakings, Public Emergency Radio Undertakings are a few instances, which according to certain criteria, may be exempt from certificate/license requirements.
In Canada, there is no formal transmission power below which a television transmitter is broadcasting at low power. Industry Canada, in most cases, considers a television transmitter to be low-power if the noise-limited bounding contours are less than 20 km from the antenna. In New Zealand residents are allowed to broadcast licence free-of-charge at a maximum of 1 watt EIRP in the FM guardbands from 87.6 to 88.3 and from 106.7 to 107.7 MHz under a General User Radio License, issued by Radio Spectrum Management, managed by the Ministry of Economic Development. Prior to June 2010, the lower band was located between 88.1 and 88.8 and a maximum of 500 mW EIRP allowed. Broadcasters on these frequencies are required to cease operations if they interfere with other, licensed broadcasters and have no protection from interference from other licensed or unlicensed broadcasters. Contact details must be broadcast every hour. Further restrictions are in place for the protection of aeronautical services. Use of the following frequencies is not permitted within certain boundaries approaching Auckland and Wellington airports: 107.5 to 107.7 FM and 107.0 to 107.3, respectively.
There exists a 25 km broadcast translator rule: one licensee may operate two transmitters anywhere, but a third transmitter must be at least 25 km away from at least one of the first two transmitters. There are efforts on self-regulation of the broadcasters themselves; the NZRSM Radio Inspectors do, however monitor and make random unannounced visits to broadcasters, will impose fines for violations of the regulations. New broadcasters are subject to an initial compulsory inspection. Temporary low-power stations are allowed at times via a Restricted Service Licence. Since 2001, long-term LPFM licences have been available in remote areas of the country; these are used for many establishments, including military bases and hospitals with fixed boundaries. Low Power FM is a non-commercial educational broadcast radio service created by the Federal Communications Commission in the United States in 2000. LPFM licenses, which are limited to a maximum effective radiated power of 100 watts, may be issued to non-commercial educational entities, as well as public safety and transportation organizations.
Individuals and holders of other types of broadcast licenses are not eligible. In addition, LPFM stations are not protected from interference from other classes of FM stations. Class L1 is to 100 watts effective radiated power. Class L2 is at least 1 and up to 10 watts ERP. In addition, Class D educational licenses exist for stations of 10 watts transmitter power output or less, regardless of ERP; these stations are all grandfathered operations, as no new licenses of this type have been issued since 1978, except in Alaska. They are not considered to be LPFM stations, although they operate noncommercially and have similar coverage areas to Class L2 stations. In January 2000, the Federal Communications Commission established Low Power FM as a new designated class of radio station; these stations wer
A television station is a set of equipment managed by a business, organisation or other entity, such as an amateur television operator, that transmits video content via radio waves directly from a transmitter on the earth's surface to a receiver on earth. Most the term refers to a station which broadcasts structured content to an audience or it refers to the organization that operates the station. A terrestrial television transmission can occur via analog television signals or, more via digital television signals. Television stations are differentiated from cable television or other video providers in that their content is broadcast via terrestrial radio waves. A group of television stations with common ownership or affiliation are known as a TV network and an individual station within the network is referred to as O&O or affiliate, respectively; because television station signals use the electromagnetic spectrum, which in the past has been a common, scarce resource, governments claim authority to regulate them.
Broadcast television systems standards vary around the world. Television stations broadcasting over an analog system were limited to one television channel, but digital television enables broadcasting via subchannels as well. Television stations require a broadcast license from a government agency which sets the requirements and limitations on the station. In the United States, for example, a television license defines the broadcast range, or geographic area, that the station is limited to, allocates the broadcast frequency of the radio spectrum for that station's transmissions, sets limits on what types of television programs can be programmed for broadcast and requires a station to broadcast a minimum amount of certain programs types, such as public affairs messages. Another form a television station may take is non-commercial educational and considered public broadcasting. To avoid concentration of media ownership of television stations, government regulations in most countries limit the ownership of television stations by television networks or other media operators, but these regulations vary considerably.
Some countries have set up nationwide television networks, in which individual television stations act as mere repeaters of nationwide programs. In those countries, the local television station has no station identification and, from a consumer's point of view, there is no practical distinction between a network and a station, with only small regional changes in programming, such as local television news. To broadcast its programs, a television station requires operators to operate equipment, a transmitter or radio antenna, located at the highest point available in the transmission area, such as on a summit, the top of a high skyscraper, or on a tall radio tower. To get a signal from the master control room to the transmitter, a studio/transmitter link is used; the link can be either by radio or T1/E1. A transmitter/studio link may send telemetry back to the station, but this may be embedded in subcarriers of the main broadcast. Stations which retransmit or simulcast another may pick-up that station over-the-air, or via STL or satellite.
The license specifies which other station it is allowed to carry. VHF stations have tall antennas due to their long wavelength, but require much less effective radiated power, therefore use much less transmitter power output saving on the electricity bill and emergency backup generators. In North America, full-power stations on band I are limited to 100 kW analog video and 10 kW analog audio, or 45 kW digital ERP. Stations on band III can go up by 31.6 kW audio, or 160 kW digital. Low-VHF stations are subject to long-distance reception just as with FM. There are no stations on Channel 1. UHF, by comparison, has a much shorter wavelength, thus requires a shorter antenna, but higher power. North American stations can go up to 5000 1000 kW digital. Low channels travel further than high ones at the same power, but UHF does not suffer from as much electromagnetic interference and background "noise" as VHF, making it much more desirable for TV. Despite this, in the U. S. the Federal Communications Commission is taking another large portion of this band away, in contrast to the rest of the world, taking VHF instead.
This means. Since at least 1974, there are no stations on channel 37 in North America for radio astronomy purposes. Most television stations are commercial broadcasting enterprises which are structured in a variety of ways to generate revenue from television commercials, they may be some other structure. They can produce some or all of their programs or buy some broadcast syndication programming for or all of it from other stations or independent production companies. Many stations have some sort of television studio, which on major-network stations is used for newscasts or other local programming. There is a news department, where journalists gather information. There is a section where electronic news-gathering operations are based, receiving remote broadcasts via remote pickup unit or satellite TV. Outside broadcasting vans, production trucks, or SUVs with electronic field production equipment are sent out with reporters, who may bring back news stories on video tape rather than sending them back live.
To keep pace with technology United States television stations have been replacing operators with broadcast automation systems to increas