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WTTW (channel 11) is a PBS member
television station A television station is a set of equipment managed by a business, organisation or other entity, such as an amateur television (ATV) operator, that transmits video content and audio content via radio waves directly from a transmitter on the ea ...
in
Chicago, Illinois (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...
, United States. Owned by
not-for-profit A nonprofit organization (NPO) or non-profit organisation, also known as a non-business entity, not-for-profit organization, or nonprofit institution, is a legal entity organized and operated for a collective, public or social benefit, in co ...
broadcaster Window to the World Communications, Inc., it is sister to commercial
classical music Classical music generally refers to the art music of the Western world, considered to be distinct from Western folk music or popular music traditions. It is sometimes distinguished as Western classical music, as the term "classical music" al ...
radio station
WFMT WFMT is an FM radio station in Chicago, Illinois, featuring a format of fine arts, classical music programming, and shows exploring such genres as folk. The station is managed by Window to the World Communications, Inc., owner of WTTW, Chicago ...
(98.7 FM). The two stations share studios in the Renée Crown Public Media Center, located at 5400 North Saint Louis Avenue (adjacent to the main campus of
Northeastern Illinois University Northeastern Illinois University (NEIU) is a public university in Chicago, Illinois. NEIU serves approximately 9,000 students in the region and is a Hispanic-serving institution. The main campus is located in the community area of North Park ...
) in the city's North Park neighborhood; its transmitter facility is atop the
Willis Tower The Willis Tower (originally the Sears Tower) is a 108- story, skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM ...
on South
Wacker Drive Wacker Drive is a major multilevel street in Chicago, Illinois, running along the south side of the main branch and the east side of the south branch of the Chicago River in the Loop.Hayner, Don and Tom McNamee, ''Streetwise Chicago'', "Wacke ...
in the Chicago Loop. WTTW also owns and operates The Chicago Production Center, a video production and editing facility that is operated alongside the three stations. WTTW is one of two PBS member stations serving the
Chicago market The Chicago metropolitan area, also colloquially referred to as Chicagoland, is a metropolitan area in the Midwestern United States. Encompassing 10,286 sq mi (28,120 km2), the metropolitan area includes the city of Chicago, its suburbs and ...
, alongside
Gary, Indiana Gary is a city in Lake County, Indiana, United States. The city has been historically dominated by major industrial activity and is home to U.S. Steel's Gary Works, the largest steel mill complex in North America. Gary is located along th ...
–licensed
WYIN WYIN (channel 56), branded on-air as Lakeshore PBS, is a secondary PBS member television station licensed to Gary, Indiana, United States, serving the Chicago area. It is owned by Northwest Indiana Public Broadcasting, Inc., as a sister station t ...
(channel 56). WTTW, along with PBS Wisconsin
flagship station In broadcasting, a flagship (also known as a flagship station or key station) is the broadcast station which originates a television network, or a particular radio or television program that plays a key role in the branding of and consumer loyalt ...
WHA-TV in
Madison, Wisconsin Madison is the county seat of Dane County and the capital city of the U.S. state of Wisconsin. As of the 2020 census the population was 269,840, making it the second-largest city in Wisconsin by population, after Milwaukee, and the 80th ...
, serve as default PBS member stations for Rockford as that market does not have a PBS station of its own; both stations are available in that market on local cable providers. On December 7, 2017, Window to the World Communications announced that it was seeking to purchase former fellow PBS member station WYCC from the
City Colleges of Chicago The City Colleges of Chicago is the public community college system of the Chicago area. Its colleges offer associate degrees, certificates, free courses for the GED, and free English as a second language (ESL) courses. The City Colleges system ...
in a move that would put WYCC and WTTW under one corporate umbrella. The sale was approved by the
Federal Communications Commission The Federal Communications Commission (FCC) is an independent agency of the United States federal government that regulates communications by radio, television, wire, satellite, and cable across the United States. The FCC maintains jurisdicti ...
(FCC) on March 13, 2018, and was completed on April 20.


History

WTTW first signed on the air on September 6, 1955, as a member station of National Educational Television (NET). The station was founded by a group of civic-minded Chicagoans, led by
Inland Steel The Inland Steel Company was an American steel company active in 1893–1998. Its history as an independent firm thus spanned much of the 20th century. It was headquartered in Chicago at the landmark Inland Steel Building. Inland Steel was an ...
executive Edward R. Ryerson. Channel 11 came to life during the first year of the inaugural term of
Mayor In many countries, a mayor is the highest-ranking official in a municipal government such as that of a city or a town. Worldwide, there is a wide variance in local laws and customs regarding the powers and responsibilities of a mayor as well ...
Richard J. Daley; Daley, Ryerson and businessman
Irving B. Harris Irving B. Harris (August 4, 1910 – September 25, 2004) was an American businessman and philanthropist. With his brother Neison, he co-founded the Toni Home Permanent Company, which was sold to the Gillette Safety Razor Co. in January 1948 for $ ...
were responsible for creating WTTW, which began its life with studios and offices in Chicago's Banker's Building. It also had a 'working exhibit' facility at the Museum of Science and Industry in Chicago's Jackson Park. The WTTW call letters were chosen as the founders wanted the station to be Chicago's "Window To The World". The station's transmitter was given to WTTW by the staff and management of the defunct KS2XBS, a
pay television Pay television, also known as subscription television, premium television or, when referring to an individual service, a premium channel, refers to subscription-based television services, usually provided by multichannel television providers, b ...
station operated by Zenith Radio Corporation on VHF channel 2 that was forced to shut down as a result of CBS
owned-and-operated station In the broadcasting industry, an owned-and-operated station (frequently abbreviated as an O&O) usually refers to a television or radio station owned by the network with which it is associated. This distinguishes such a station from an affiliate ...
WBBM-TV WBBM-TV (channel 2) is a television station in Chicago, Illinois, United States, airing programming from the CBS network. Owned and operated by the network's CBS News and Stations division, the station maintains studios on West Washington ...
's relocation to that channel in July 1953. Ryerson recruited a young communications lawyer, Newton N. Minow, to join the station's board; Minow would serve as both
chairman The chairperson, also chairman, chairwoman or chair, is the presiding officer of an organized group such as a board, committee, or deliberative assembly. The person holding the office, who is typically elected or appointed by members of the group ...
of the WTTW board and as Commissioner of the FCC under the administration of President John F. Kennedy. Irving B. Harris, Henry W. "Brick" Meers,
John W. McCarter John W. McCarter Jr. (born 1938) is an American business executive and public educator, notable for his long tenure as president and CEO of the Field Museum in Chicago. Early life and education Born in Oak Park, Illinois, McCarter is the son of ...
Jr., Martin J. "Mike" Koldyke and Sandra P. Guthman have served as chairman of the board for the public broadcaster in subsequent decades. Guthman, a member of the Polk Brothers family of Chicago, is the current chairman of the board, having served in that post since October 2003. Minow stated that the only really important decision that he made during his tenure as chair of WTTW was the recruitment of William J. McCarter Jr. as president and
chief executive officer A chief executive officer (CEO), also known as a central executive officer (CEO), chief administrator officer (CAO) or just chief executive (CE), is one of a number of corporate executives charged with the management of an organization especiall ...
, a post which he held for 27 years. Having run public station
WETA-TV WETA-TV (channel 26) is the primary PBS member television station in Washington, D.C. Owned by the Greater Washington Educational Telecommunications Association, it is a sister station to NPR member WETA (90.9 FM). The two outlets share stud ...
in Washington, D.C., McCarter—a decorated
Korean War {{Infobox military conflict , conflict = Korean War , partof = the Cold War and the Korean conflict , image = Korean War Montage 2.png , image_size = 300px , caption = Clockwise from top:{ ...
hero and a veteran television pioneer—got his start in the broadcasting industry as a cameraman for ''
American Bandstand ''American Bandstand'', abbreviated ''AB'', is an American music-performance and dance television program that aired in various versions from 1952 to 1989, and was hosted from 1956 until its final season by Dick Clark, who also served as the pr ...
'' and then as a part of the Army-McCarthy hearings on
Capitol Hill Capitol Hill, in addition to being a metonym for the United States Congress, is the largest historic residential neighborhood in Washington, D.C., stretching easterly in front of the United States Capitol along wide avenues. It is one of the ...
. McCarter developed the concept of the political
roundtable The Round Table ( cy, y Ford Gron; kw, an Moos Krenn; br, an Daol Grenn; la, Mensa Rotunda) is King Arthur's famed table in the Arthurian legend, around which he and his knights congregate. As its name suggests, it has no head, implying that e ...
that is now a staple of television news. In non-commercial television circles, McCarter is referred to as the "architect" of public television (his friends know him as the man who kicked
Bob Dylan Bob Dylan (legally Robert Dylan, born Robert Allen Zimmerman, May 24, 1941) is an American singer-songwriter. Often regarded as one of the greatest songwriters of all time, Dylan has been a major figure in popular culture during a career sp ...
—who was set to tape an episode of ''
SoundStage A sound stage (also written soundstage) is a soundproof, large structure, building, or room with large doors and high ceilings, used for the production of theatrical film-making and television productions, usually located on a secured movie or ...
'' and was found by McCarter asleep on the couch in the room—out of his office, waking the bearded Dylan up and ushering him out of the office after McCarter returned from a meeting). During the 1960s, WTTW aired educational programming during the daytime hours, showing programs produced under the auspices of Chicago Area Schools Television (CAST). Programs from "TV College", covering college subjects, were also shown on weekdays. Other afternoon shows included a locally produced series titled ''The Storyteller'', which featured a children's story presented weekdays at 5:30 p.m., and was sponsored by the locally based
Marshall Field & Company Marshall Field & Company (commonly known as Marshall Field's) was an upscale department store in Chicago, Illinois. Founded in the 19th century, it grew to become a large chain before Macy's, Inc acquired it in 2005. Its eponymous founder, Ma ...
department store chain. On October 5, 1970, WTTW became a charter member station of the Public Broadcasting Service ( PBS). WTTW did not broadcast programming on Saturdays until summer 1972, when it began airing a limited schedule of programming on that day until 2:00 p.m.; the station expanded its Saturday programming scheduled to a full broadcast day in 1974. In the late 1970s and early 1980s, WTTW was used during the overnight hours as a test vehicle in the development of
stereophonic sound Stereophonic sound, or more commonly stereo, is a method of sound reproduction that recreates a multi-directional, 3-dimensional audible perspective. This is usually achieved by using two independent audio channels through a configuration ...
for television audio broadcasts. On August 7, 1984, WTTW became the first television station in the United States to broadcast its entire schedule in stereo sound. In 1981, the Chicago Educational Television Association founded ''
Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = List of sovereign states, Count ...
'' magazine as the program guide for WTTW and WFMT; the publication was sold to a
joint venture A joint venture (JV) is a business entity created by two or more parties, generally characterized by shared ownership, shared returns and risks, and shared governance. Companies typically pursue joint ventures for one of four reasons: to acces ...
between Metropolitan Detroit Magazine and Adams Communications in 1986 for $17 million. On November 22, 1987, WTTW's signal was hijacked by an unknown person wearing a Max Headroom mask—the second such signal interruption incident to occur in the Chicago area that night, with the first taking place during the 9:00 p.m. newscast on
independent station An independent station is an independent radio or terrestrial television station which is independent in some way from broadcast networks. The definition of "independence" varies from country to country, reflecting governmental regulations, marke ...
WGN-TV WGN-TV (channel 9) is an Independent station (North America), independent television station in Chicago, Chicago, Illinois, United States. Owned by Nexstar Media Group, it is sister station, sister to the company's sole radio property, talk ra ...
(channel 9) two hours prior to the hacker's intrusion of the WTTW signal. While WGN-TV's analog transmitter was located atop the John Hancock Center at the time, allowing for engineers to almost immediately thwart the video hacker by changing the studio-to-transmitter frequency, WTTW's transmitter was located atop the Sears Tower (now the
Willis Tower The Willis Tower (originally the Sears Tower) is a 108- story, skyscraper in the Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM ...
), which made it harder to stop the hacker before the interruption voluntarily concluded after almost two minutes. On June 4, 2010, Window to the World Communications announced that it would lay off around 12% of WTTW and WFMT's employee base and extend a salary freeze instituted in 2009 for one additional year, in an effort to cut $3 million in operating costs due to declining revenue, effects from the economic downturn and the loss of $1.25 million in grant money from the
Illinois General Assembly The Illinois General Assembly is the legislature of the U.S. state of Illinois. It has two chambers, the Illinois House of Representatives and the Illinois Senate. The General Assembly was created by the first state constitution adopted in 181 ...
. Among the employees exiting WTTW in that layoff were Randy Chandler, Amy Christenson, Andy Fontana, Marc Glick, Susan Godfrey, Andrea Guthmann, Kari Hurley, Andre Jones, Shaunese Teamer, Sarah Warner and Tom Wuellner. In 2012, WTTW eliminated the position of 16-year company veteran Joanie Bayhack, who had been senior vice president of communications and corporate partnerships. In 2014, WTTW eliminated the position of Holly Gilson, a 13-year veteran of the company who most recently had been director of strategic partnerships and special projects. On April 15, 2014, Window to the World Communications renamed the broadcasting facilities for WTTW and WFMT-FM as the Renée Crown Public Media Center, following a monetary gift of an undisclosed amount by the family of Renée Crown (wife of Lester), who has served as a trustee for Window to the World since 1981).


Technical achievements

WTTW has long been a pioneer in many technical aspects of television broadcasting, particularly in broadcast audio transmission. The station, in particular, participated in the trend of pop music-focused programs on television during the early 1970s (a few of which were also simulcast on local FM radio stations). When WTTW began production on ''Made in Chicago'', the station made the decision to transition from monaural audio to stereo for the FM broadcasts. However, stereo recording equipment for television production did not exist at that time. Because of this, WTTW engineers chose to modify existing
Ampex Ampex is an American electronics company founded in 1944 by Alexander M. Poniatoff as a spin-off of Dalmo-Victor. The name AMPEX is a portmanteau, created by its founder, which stands for Alexander M. Poniatoff Excellence.AbramsoThe History ...
quadruplex recorders to provide a stereo medium in sync with the video portion of the program. This innovation earned the station's staff a local Technical
Emmy Award The Emmy Awards, or Emmys, are an extensive range of awards for artistic and technical merit for the American and international television industry. A number of annual Emmy Award ceremonies are held throughout the calendar year, each with the ...
in 1973. Further refinements to this system resulted in improvements to both frequency response and noise reduction, and eventually led to the ability to edit stereo audio as the video was being edited electronically.
Dolby Laboratories Dolby Laboratories, Inc. (often shortened to Dolby Labs and known simply as Dolby) is an American company specializing in audio noise reduction, audio encoding/compression, spatial audio, and HDR imaging. Dolby licenses its technologies to ...
noise reduction technology (Type C, and then Type A) was introduced as the staff was driven to make improvements in the audio specifications. WTTW began syndicating ''Made in Chicago'' to other public television stations under the new title ''Soundstage'', with the first official taping of that program in June 1974 featuring previously filmed concert footage of folk singer Jim Croce prior to his death in a plane crash in September 1973. The station was broadcast in simulcast FM stereo—with WXRT (93.1 FM) and WBBM-FM (96.3) as participating stations—in the manner of its predecessor. In 1975, WTTW management was approached by a startup company called Telesonics with an idea to develop an audio system for television broadcasts that used a mono-compatible, stereo audio channel. Around this time, the Sears Tower had been completed and WTTW became one of the first broadcasters to move its transmitter facilities atop the new building; WTTW had broadcast from a temporary antenna as the now familiar twin towers that adorn the top of the building had not yet been completed.


Programming

Programming on WTTW is funded in part by financial support of viewers and by other not-for-profit organizations such as the Corporation For Public Broadcasting. WTTW carries programs distributed by PBS, American Public Television and other sources, along with airing several locally produced programs. WTTW also distributes several programs to public television stations independently of PBS, such as via American Public Television. In addition, WTTW is one of the few public television stations that regularly produce or present national public television programming. Its most prominent productions include political discussion program '' The McLaughlin Group'' and the music program ''
Soundstage A sound stage (also written soundstage) is a soundproof, large structure, building, or room with large doors and high ceilings, used for the production of theatrical film-making and television productions, usually located on a secured movie or ...
''. WTTW has produced over 110 ''SoundStage'' episodes from its Chicago studios, the first of which featured Chicago blues legend
Muddy Waters McKinley Morganfield (April 4, 1913 April 30, 1983), known professionally as Muddy Waters, was an American blues singer and musician who was an important figure in the post- war blues scene, and is often cited as the "father of modern Chicag ...
surrounded by his young proteges:
Dr. John Malcolm John Rebennack Jr. (November 20, 1941 – June 6, 2019), better known by his stage name Dr. John, was an American singer and songwriter. His music encompassed New Orleans blues, jazz, funk, and R&B. Active as a session musician from ...
, Junior Wells, Michael Bloomfield, Koko Taylor, Rollo Radford, Buddy Guy, Nick Gravenites, Buddy Miles and his long-time collaborator, pianist
Otis Spann Otis Spann (March 21, 1924 or 1930April 24, 1970) was an American blues musician, whom many consider to be the leading postwar Chicago blues pianist. Early life Sources differ over Spann's early years. Some state that he was born in Jackson, Mis ...
among others. WTTW also produced the popular cooking series ''
The Frugal Gourmet Jeffrey L. Smith (January 22, 1939 – July 7, 2004) was the author of several cookbooks and the host of ''The Frugal Gourmet'', a popular American cooking show. The show began in Tacoma, Washington, as ''Cooking Fish Creatively'' on local ...
'' during the 1980s. Other popular programs produced by WTTW for public television syndication have included the early art-video show ''Image Union''; '' CEO Exchange''; locally produced restaurant review show '' Check, Please!'' cooking show '' Mexico: One Plate at a Time''; travel show ''
The Travel Detective Peter S. Greenberg (born January 20) is an American journalist. He is the CBS News Travel Editor, reporting regularly on ''The Early Show'', its replacement ''CBS This Morning'', and the ''CBS Evening News''. He may be best known as the Travel E ...
''; children's programs '' Lamb Chop's Play-Along'', '' Kidsongs'', '' WordWorld'' and '' Nature Cat''; and the irreverent magazine series '' Wild Chicago''. The most well-known program ever to have been originated by WTTW was '' Sneak Previews'', the first movie review show to air on television. It began in 1975 with film critics
Roger Ebert Roger Joseph Ebert (; June 18, 1942 – April 4, 2013) was an American film critic, film historian, journalist, screenwriter, and author. He was a film critic for the ''Chicago Sun-Times'' from 1967 until his death in 2013. In 1975, Ebert beca ...
(then a critic for the ''
Chicago Sun-Times The ''Chicago Sun-Times'' is a daily newspaper published in Chicago, Illinois, United States. Since 2022, it is the flagship paper of Chicago Public Media, and has the second largest circulation among Chicago newspapers, after the '' Chicago ...
'') and
Gene Siskel Eugene Kal Siskel (January 26, 1946 – February 20, 1999) was an American film critic and journalist for the '' Chicago Tribune''. Along with colleague Roger Ebert, he hosted a series of movie review programs on television from 1975 until his ...
(then with the ''
Chicago Tribune The ''Chicago Tribune'' is a daily newspaper based in Chicago, Illinois, United States, owned by Tribune Publishing. Founded in 1847, and formerly self-styled as the "World's Greatest Newspaper" (a slogan for which WGN radio and television ar ...
'') as its hosts and was later hosted by Michael Medved, Neal Gabler, and
Jeffrey Lyons Jeffrey Lyons (born November 5, 1944) is an American television and film critic based in the New York metropolitan area. Early life Lyons was born in Manhattan, one of the four sons of Sylvia R. (Schoenberger) and Leonard Lyons, a newspaper colu ...
when Siskel and Ebert moved into syndication (starting the show ''
At the Movies with Gene Siskel and Roger Ebert ''At the Movies'' (also known as ''At the Movies with Gene Siskel and Roger Ebert'') is an American movie review television program that aired from 1982 to 1990. It was produced by Tribune Entertainment and was created by Gene Siskel and Roger E ...
'' and later '' Siskel & Ebert & the Movies''); ''Sneak Previews'' was cancelled in 1996. In January 2011, WTTW produced a new movie review program created by Ebert, '' Ebert Presents: At the Movies'', which was hosted by
Christy Lemire Christy A. Lemire (née Nemetz; born August 30, 1972) is an American film critic and host of the movie review podcast ''Breakfast All Day''. She previously wrote for the Associated Press from 1999 to 2013, was a co-host of ''Ebert Presents at ...
and Ignatiy Vishnevetsky, with Ebert himself hosting a segment called "Roger's Office"; the program lasted one season, before being cancelled due to funding constraints and the subsequent death of Ebert. Among its local programs, WTTW also produces the newsmagazine and analysis program '' Chicago Tonight'', hosted by Phil Ponce. The program began in 1984 as a half-hour panel interview program with local broadcast journalist John Callaway, but was later expanded to an hour-long show with the addition of various feature segments including arts and restaurant reviews. The series ''Chicago Matters''—which is underwritten by the Chicago Community Trust—is considered to perhaps be the preeminent local journalism collaboration in the United States, involving television, radio and print, and dialogue at the highest levels of articulation. The station has produced hundreds of significant arts programs, highlighting the
Chicago Symphony Orchestra The Chicago Symphony Orchestra (CSO) was founded by Theodore Thomas in 1891. The ensemble makes its home at Orchestra Hall in Chicago and plays a summer season at the Ravinia Festival. The music director is Riccardo Muti, who began his tenu ...
, the Lyric Opera of Chicago and the Ravinia Festival. In addition, WTTW features
documentaries A documentary film or documentary is a non-fictional motion-picture intended to "document reality, primarily for the purposes of instruction, education or maintaining a historical record". Bill Nichols has characterized the documentary in term ...
hosted by
Geoffrey Baer Geoffrey Baer is an American television personality, actor and producer best known for hosting the '' 10 That Changed America'' series, the ''Chicago By Boat'' architecture series, and other television programs produced by WTTW in Chicago for ...
, spotlighting the history and culture of various parts of the Chicago area. These programs' popularity has often resulted in a high volume of monetary pledges to the station. It also produces ''The Artsiders'', an arts-focused program produced by Kai Harding, Inc. and created by former Big Idea director Chris Olsen.


Technical information


Subchannels

The station's digital channel is multiplexed: In May 2015, WTTW downgraded the resolution of its main channel from
1080i 1080i (also known as Full HD or BT.709) is a combination of frame resolution and scan type. 1080i is used in high-definition television (HDTV) and high-definition video. The number "1080" refers to the number of horizontal lines on the scree ...
to
720p 720p (1280×720 px; also called HD ready, standard HD or just HD) is a progressive HDTV signal format with 720 horizontal lines/1280 columns and an aspect ratio (AR) of 16:9, normally known as widescreen HDTV (1.78:1). All major HDTV broadcas ...
, which the station had previously transmitted its high definition content in prior to September 2009, during which time it downconverted HD content provided by PBS from their native 1080i format.


WTTW-DT2

From the sign-on of its digital signal in 2004 until 2009, WTTW branded its main digital channel on 11.1 as "WTTW-Digital", featuring a full schedule of programs available in high definition, while digital subchannel 11.2 rebroadcast the main programming schedule of analog channel 11. In September 2008, digital channel 11.1 was converted into a simulcast of the analog signal's programming, resulting in it carrying the same programming schedule as 11.2. On March 30, 2009, 11.2 was relaunched with a separate schedule as "WTTW Prime", which features a mix of PBS prime time programs and WTTW's locally produced programming—particularly during the period from 6:00 a.m. to 6:00 p.m., when children's programming airs on the main channel. WTTW Prime carries some PBS programs in their traditional timeslots (most notably, a block of the service's public affairs programs that run on Friday evenings and a daily airing of the '' Nightly Business Report'' at 5:30 p.m.) WTTW Prime is also available on Comcast
digital Digital usually refers to something using discrete digits, often binary digits. Technology and computing Hardware *Digital electronics, electronic circuits which operate using digital signals ** Digital camera, which captures and stores digital ...
channel 370.


Analog-to-digital conversion

WTTW shut down its analog signal, over
VHF Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF ...
channel 11, on June 12, 2009, the official date in which full-power television stations in the United States transitioned from analog to digital broadcasts under federal mandate. The station's digital signal continued to broadcast on its pre-transition
UHF Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one tenth of a meter (on ...
channel 47. Through the use of PSIP, digital television receivers display the station's
virtual channel In most telecommunications organizations, a virtual channel is a method of remapping the ''program number'' as used in H.222 Program Association Tables and Program Mapping Tables to a channel number that can be entered via digits on a receiver's ...
as its former VHF analog channel 11. The "WTTW" callsign was also officially transferred from the now-defunct analog channel 11 to digital channel 47, with the "WTTW-DT" callsign used to identify digital channel 47 during the pre-transition era officially being discontinued.


References


External links

*
ProductionsStreaming video of ''CBS Evening News'' coverage of the Max Headroom pirate incidentWilliam J. McCarter papers
are located at the University of Maryland Libraries. McCarter was president and general manager of WTTW from 1964 to 1971, under him the station and its sister station received 12 George Foster Peabody Awards. {{PBSTV PBS member stations Peabody Award winners Television channels and stations established in 1955 TTW 1955 establishments in Illinois North Park, Chicago