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Hilmer Swanson
Hilmer Irvin Swanson (July 25, 1932 Davenport, Iowa – July 21, 2005 Quincy, Illinois)Hilmer Irvin Swanson 1932 - 2005 , Barry Mishkind – the Eclectic Engineer, theBDR.netHilmer Swanson Dies RadioWorld, July 22, 2005, accessed April 18, 2012 radiolists.net, July 23, 2005, accessed April 18, 2012 was an American who developed several leading, patented techniques for |
Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation. AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning with Roberto Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900. This original form of AM is sometimes called double-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency. Single-sideband modulation uses bandpass filters to eliminate one of the sidebands and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation. AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning with Roberto Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900. This original form of AM is sometimes called double-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency. Single-sideband modulation uses bandpass filters to eliminate one of the sidebands and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amplitude Modulation
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation. AM was the earliest modulation method used for transmitting audio in radio broadcasting. It was developed during the first quarter of the 20th century beginning with Roberto Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900. This original form of AM is sometimes called double-sideband amplitude modulation (DSBAM), because the standard method produces sidebands on either side of the carrier frequency. Single-sideband modulation uses bandpass filters to eliminate one of the sidebands and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Davenport, Iowa
Davenport is a city in and the county seat of Scott County, Iowa, United States. Located along the Mississippi River on the eastern border of the state, it is the largest of the Quad Cities, a metropolitan area with a population of 384,324 and a combined statistical area population of 474,019, ranking as the 147th-largest MSA and 91st-largest CSA in the nation. According to the 2020 census, the city had a population of 101,724, making it Iowa's third-largest city. Davenport was founded on May 14, 1836, by Antoine Le Claire and was named for his friend George Davenport, a former English sailor who served in the U.S. Army during the War of 1812, served as a supplier Fort Armstrong, worked as a fur trader with the American Fur Company, and was appointed a quartermaster with the rank of colonel during the Black Hawk War. The city is prone to frequent flooding due to its location on the Mississippi River. There are two main universities: St. Ambrose University and Palmer College of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collins Radio
Rockwell Collins was a multinational corporation headquartered in Cedar Rapids, Iowa, providing avionics and information technology systems and services to government agencies and aircraft manufacturers. It was formed when the Collins Radio Company, facing financial difficulties, was purchased by Rockwell International in 1973. In 2001, the avionics division of Rockwell International was spun off to form the current Rockwell Collins, Inc, retaining its name. The company was acquired by United Technologies Corporation on November 27, 2018, and now operates as part of Collins Aerospace, a subsidiary of Raytheon Technologies. History Arthur A. Collins founded Collins Radio Company in 1933 in Cedar Rapids, Iowa. It designed and produced both shortwave radio equipment and equipment for the burgeoning AM radio broadcast industry. Collins was solicited by the military, the scientific community, and the larger AM radio stations for special equipment. Collins supplied the equipment to e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Association Of Broadcasters
The National Association of Broadcasters (NAB) is a trade association and lobby group representing the interests of commercial and non-commercial over-the-air radio and television broadcasters in the United States. The NAB represents more than 8,300 terrestrial radio and television stations as well as broadcast networks. As of 2022, the president and CEO of the NAB is Curtis LeGeyt. Founding The NAB was founded as the National Association of Radio Broadcasters (NARB) in April 1923 at the Drake Hotel in Chicago. The association's founder and first president was Eugene F. McDonald Jr., who also launched the Zenith corporation. In 1951 it changed its name to the National Association of Radio and Television Broadcasters (NARTB) to include the television industry. In 1958 it adopted its current name, "National Association of Broadcasters". Commercial radio The NAB worked to establish a commercial radio system in the United States. The system was set up in August 1928 with th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phillip W
Philip, also Phillip, is a male given name, derived from the Greek (''Philippos'', lit. "horse-loving" or "fond of horses"), from a compound of (''philos'', "dear", "loved", "loving") and (''hippos'', "horse"). Prominent Philips who popularized the name include kings of Macedonia and one of the apostles of early Christianity Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth. It is the world's largest and most widespread religion with roughly 2.38 billion followers representing one-third of the global pop .... ''Philip'' has #Philip in other languages, many alternative spellings. One derivation often used as a surname is Phillips (surname), Phillips. It was also found during ancient Greek times with two Ps as Philippides (other), Philippides and Philippos. It has many diminutive (or even hypocorism, hypocoristic) forms including Phil, Philly (other)#People, Philly, Lip (other), Lip, Pi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Wood Community College
John Wood Community College (JWCC) is a public community college in Quincy, Illinois. It is one of 48, two-year, open-admission colleges of the Illinois Community College System organized under the Illinois Public Community College Act. History John Wood Community College was founded in 1974 to provide post-secondary education for residents of Community College District 539. The college is named after John Wood, founder of Quincy and 12th governor of Illinois. JWCC began classes in 1975 with 668 enrolled students. Authorized by the Illinois General Assembly and signed by Illinois Governor Otto Kerner, Jr. in 1961, the legislation enacted created the Illinois Board of Higher Education (IBHE). The IBHE was tasked by statute with formulating a Master Plan for Higher Education in the state of Illinois. In July 1964 the higher education master plan was published by the IBHE, which led to the passage of the Junior College Act of 1965 by the 72nd Illinois General Assembly. However ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John DeLay
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died c. AD 30), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (lived c. AD 30), one of the twelve apostles of Jesus * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Tube
A vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric voltage, potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplifier, amplification and current rectifier, rectification. Non-thermionic types such as a vacuum phototube, however, achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light intensities. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube. The simplest vacuum tube, the diode (i.e. Fleming valve), invented in 1904 by John Ambrose Fleming, contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Progressive Series Modulation
Progressive may refer to: Politics * Progressivism, a political philosophy in support of social reform ** Progressivism in the United States, the political philosophy in the American context * Progressive realism, an American foreign policy paradigm focused on producing measurable results in pursuit of widely supported goals Political organizations * Congressional Progressive Caucus, members within the Democratic Party in the United States Congress dedicated to the advancement of progressive issues and positions * Progressive Alliance (other) * Progressive Conservative (other) * Progressive Party (other) * Progressive Unionist (other) Other uses in politics * Progressive Era, a period of reform in the United States (c. 1890–1930) * Progressive tax, a type of tax rate structure Arts, entertainment, and media Music * Progressive music, a type of music that expands stylistic boundaries outwards * "Progressive" (song), a 2009 s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulse Duration Modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a method of reducing the average power delivered by an electrical signal, by effectively chopping it up into discrete parts. The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load. Along with maximum power point tracking (MPPT), it is one of the primary methods of reducing the output of solar panels to that which can be utilized by a battery. PWM is particularly suited for running inertial loads such as motors, which are not as easily affected by this discrete switching, because their inertia causes them to react slowly. The PWM switching frequency has to be high enough not to affect the load, which is to say that the resultant waveform perceived by the load must be as smooth as possible. The rate (or frequency) a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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