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September 11, 2001 Radio Communications
Communication problems and successes played an important role during the September 11 attacks in 2001 and their aftermath. Systems were variously destroyed or overwhelmed by loads greater than they were designed to carry, or failed to operate as intended or desired. Attackers The organizers of the September 11, 2001 terrorist attacks apparently planned and coordinated their mission in face to face meetings and used little or no electronic communication. This "radio silence" made their plan more difficult to detect. Federal government According to 9/11 Commission staff statement No. 17 there were several communications failures at the federal government level during and after the 9/11 attacks. Perhaps the most serious occurred in an "Air Threat Conference Call" initiated by the National Military Command Center (NMCC) after two planes had crashed into the World Trade Center, but shortly before The Pentagon was hit. The participants were unable to include the Federal Aviation Ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communication
Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquiry studying them. There are many disagreements about its precise definition. John Peters argues that the difficulty of defining communication emerges from the fact that communication is both a Universality (philosophy), universal phenomenon and a Communication studies, specific discipline of institutional academic study. One definitional strategy involves limiting what can be included in the category of communication (for example, requiring a "conscious intent" to persuade). By this logic, one possible definition of communication is the act of developing Semantics, meaning among Subject (philosophy), entities or Organization, groups through the use of sufficiently mutually understood signs, symbols, and Semiosis, semiotic conventions. An im ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Repeater
In telecommunications, a repeater is an electronic device that receives a signal and retransmits it. Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction. Some types of repeaters broadcast an identical signal, but alter its method of transmission, for example, on another frequency or baud rate. There are several different types of repeaters; a telephone repeater is an amplifier in a telephone line, an optical repeater is an optoelectronic circuit that amplifies the light beam in an optical fiber cable; and a radio repeater is a radio receiver and transmitter that retransmits a radio signal. A broadcast relay station is a repeater used in broadcast radio and television. Overview When an information-bearing signal passes through a communication channel, it is progressively degraded due to loss of power. For example, when a telephone call passes through a wire telephone line, some of the powe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Betty Ong
Betty Ann Ong (; February 5, 1956 – September 11, 2001) was an American flight attendant aboard American Airlines Flight 11, the first airplane hijacked during the September 11 attacks. Ong was the first person to alert authorities to the hijackings taking place that day. Shortly after the hijacking, Ong notified the American Airlines ground crew of the hijacking, staying on the radiophone for 25 minutes to relay vital information that led to the closing of airspace by the FAA, a first in United States history. For this, the 9/11 Commission declared Ong a hero. Personal life Betty Ann Ong was born on February 5, 1956 in San Francisco. She was of Kaiping descent, a branch of Sze Yup Cantonese (Taishanese), and had two sisters, one of whom was named Cathie, and a brother named Harry. Among her hobbies as an adult was collecting Beanie Babies. Ong was engaged to Robert Landrum. Flight 11 and death On September 11, 2001, Ong assigned herself to Flight 11, so she could return ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madeline Amy Sweeney
Madeline Amy Sweeney (December 14, 1965 – September 11, 2001) was an American flight attendant who was killed when American Airlines Flight 11 was deliberately crashed into the World Trade Center by hijackers during the September 11 attacks. American Airlines Flight 11 On September 11, 2001, Sweeney, who had been a flight attendant for 12 years, was asked by American Airlines to take an extra shift because the other crew member, who was assigned to the position, was ill. Normally, she would only work part-time on weekends. At approximately 7:15 a.m., before the plane had taken off, Sweeney made a cellular telephone call to her husband Mike, from the plane – which he deemed to be "highly unusual". She was feeling low about being at work and missing out on a chance to see their five-year old daughter Anna, a kindergartner, off to school. Mike comforted her by saying she'd have plenty of days ahead to see their kids off to school. After the plane was hijacked ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbara K
Barbara may refer to: People * Barbara (given name) * Barbara (painter) (1915–2002), pseudonym of Olga Biglieri, Italian futurist painter * Barbara (singer) (1930–1997), French singer * Barbara Popović (born 2000), also known mononymously as Barbara, Macedonian singer * Bárbara (footballer) (born 1988), Brazilian footballer Film and television * ''Barbara'' (1961 film), a West German film * ''Bárbara'' (film), a 1980 Argentine film * ''Barbara'' (1997 film), a Danish film directed by Nils Malmros, based on Jacobsen's novel * ''Barbara'' (2012 film), a German film * ''Barbara'' (2017 film), a French film * ''Barbara'' (TV series), a British sitcom Places * Barbara (Paris Métro), a metro station in Montrouge and Bagneux, France * Barbaria (region), or al-Barbara, an ancient region in Northeast Africa * Barbara, Arkansas, U.S. * Barbara, Gaza, a former Palestinian village near Gaza * Barbara, Marche, a town in Italy * Berbara, or al-Barbara, Lebanon * Berbara, Akkar D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jeremy Glick (September 11 Attack Victim)
Jeremy Logan Glick (September 3, 1970 – September 11, 2001) was an American passenger on board United Airlines Flight 93, which was hijacked and crashed as part of the September 11 attacks. Aware of the earlier attacks at the World Trade Center, Glick and some of his fellow passengers attempted to foil the hijacking. During a struggle to reclaim the aircraft, it crashed into a field in Stonycreek Township near Shanksville, Pennsylvania, killing all 33 passengers and seven crew members on board, along with the four hijackers. Personal life Glick was born September 3, 1970 into a Jewish family and had five siblings, all of whose names begin with the letter "J". He was a middle child among the six children of his family. He grew up in Saddle River, New Jersey and attended Saddle River Day School. He and his high school sweetheart, Lyzbeth, were prom king and queen in 1988. Glick was an American National Collegiate Judo champion while he was a student at the University of Rocheste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mark Bingham
Mark Kendall Bingham (May 22, 1970 – September 11, 2001) was an American public relations executive who founded his own company, the Bingham Group. During the September 11 attacks in 2001, he was a passenger on board United Airlines Flight 93. Bingham was among the passengers who, along with Todd Beamer, Tom Burnett and Jeremy Glick, formed the plan to retake the plane from the Aircraft hijacking, hijackers, and led the effort that resulted in the crash of the plane into a field near Shanksville, Pennsylvania, thwarting the hijackers' plan to crash the plane into a building in Washington, D.C., most likely either the United States Capitol, U.S. Capitol Building or the White House. His heroic efforts on United Flight 93, as well as his athletic physique, were noted for having prompted a reassessment of LGBT stereotypes, gay stereotypes. Early life Mark Bingham was born in 1970, the only child of Alice Hoagland and Gerald Bingham. When Mark was two years old, his parents divorce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tom Burnett
Thomas Edward Burnett Jr. (May 29, 1963 – September 11, 2001) was an American who was the vice-president and chief operating officer of Thoratec Corporation, a medical devices company based in Pleasanton, California; he resided in nearby San Ramon, California. On September 11, 2001, Burnett was a passenger on board United Airlines Flight 93, which was hijacked as part of the September 11 attacks. He, along with other passengers, formed the plan to retake the plane from the hijackers, and led the effort that resulted in the crash of the plane into a field in Stonycreek Township near Shanksville, Pennsylvania, thwarting the plan of the hijackers to crash the plane into a building in Washington, D.C., most likely either the U.S. Capitol Building or the White House. Early life and education Thomas Burnett was born on May 29, 1963, the son of Thomas Burnett Sr. and Beverly Burnett. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Todd Beamer
Todd Morgan Beamer (November 24, 1968 – September 11, 2001) was an American passenger aboard United Airlines Flight 93, which was aircraft hijacking, hijacked and crashed as part of the September 11 attacks in 2001. He was one of the passengers who attempted to regain control of the aircraft from the hijackers. During the struggle, the Boeing 757 lost control and crashed into a field in Stonycreek Township, Somerset County, Pennsylvania, Stonycreek Township near Shanksville, Pennsylvania, killing everyone on board, but saving United Airlines Flight 93#Possible targets, the hijackers' intended target and additional victims. Biography Todd Beamer was born on November 24, 1968, in Flint, Michigan, to David Beamer, an IBM sales representative, and Peggy Jackson Beamer, a muralist,Evensen, Bruce J. (2009)"Beamer, Todd Morgan" ''American National Biography''. Retrieved May 14, 2014. the middle child of three and only son. Beamer and his two sisters, Melissa and Michele, were raised " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandra Bradshaw
United Airlines Flight 93 was a domestic scheduled passenger flight that was hijacked by four al-Qaeda attackers aboard the plane on the morning of September 11, 2001, as part of the September 11 attacks. The plane eventually crashed in Somerset County, Pennsylvania following an attempt by the passengers and crew to regain control of the plane from the hijackers. All 44 people on board were killed, including the hijackers. The aircraft, a Boeing 757-222, was flying United Airlines' daily scheduled morning flight from Newark International Airport in New Jersey to San Francisco International Airport in California. The hijackers stormed the aircraft's cockpit 46 minutes after takeoff. The captain and first officer struggled with the hijackers, which was transmitted to air traffic control. Ziad Jarrah, who had trained as a pilot, took control of the aircraft and diverted it back toward the east coast, in the direction of Washington, D.C., the U.S. capital. Khalid Sheikh Mohamme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amateur Radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;" (either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety (such as police and fire), or professional two-way radio services (such as maritime, aviation, taxis, etc.). The amateur radio service (''amateur service'' and '' amateur-satellite service'') is established by the International Telecommunication Union (ITU) through the Radio Regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station licenses with a unique identifying call sign, which mus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
7 World Trade Center
7 World Trade Center (7 WTC, WTC-7, or Tower 7) refers to two buildings that have existed at the same location within the World Trade Center site in Lower Manhattan, New York City. The original structure, part of the original World Trade Center, was completed in 1987 and was destroyed in the September 11 attacks in 2001. The current structure opened in May 2006. Both buildings were developed by Larry Silverstein, who holds a ground lease for the site from the Port Authority of New York and New Jersey. The original Trade Center was tall, clad in red granite masonry, and occupied a trapezoidal footprint. An elevated walkway spanning Vesey Street connected the building to the World Trade Center plaza. The building was situated above a Consolidated Edison power substation, which imposed unique structural design constraints. When the building opened in 1987, Silverstein had difficulties attracting tenants. Salomon Brothers signed a long-term lease in 1988 and became the anchor te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
