HOME TheInfoList.com
Providing Lists of Related Topics to Help You Find Great Stuff
[::MainTopicLength::#1500] [::ListTopicLength::#1000] [::ListLength::#15] [::ListAdRepeat::#3]

picture info

High Frequency
HIGH FREQUENCY (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the DECAMETER BAND or DECAMETER WAVE as its wavelengths range from one to ten decameters (ten to one hundred metres). Frequencies immediately below HF are denoted medium frequency (MF), while the next band of higher frequencies is known as the very high frequency (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio . Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or "skywave " propagation – these frequencies are suitable for long-distance communication across intercontinental distances
[...More...]

"High Frequency" on:
Wikipedia
Google
Yahoo

Band IV
BAND IV is the name of a radio frequency range within the ultra high frequency part of the electromagnetic spectrum . Sources differ on the exact frequency range of the band. For example, the Swiss Federal Office of Communications, the Broadcast engineer's reference book and Ericsson
Ericsson
India Ltd all define the range of Band IV from 470 to 582 MHz
MHz
. An EICTA paper defines the range as 474 to 602 MHz, whilst the BBC
BBC
define the range as 470 to 614 MHz. Band IV is primarily used for analogue and digital ( DVB-T
DVB-T
, ATSC
ATSC
and ISDB
ISDB
) television broadcasting, as well as services intended for mobile devices such as DVB-H
[...More...]

"Band IV" on:
Wikipedia
Google
Yahoo

picture info

International Telecommunication Union
The INTERNATIONAL TELECOMMUNICATION UNION (ITU; French: Union Internationale des Télécommunications (UIT)), originally the INTERNATIONAL TELEGRAPH UNION (French: Union Télégraphique Internationale), is a specialized agency of the United Nations
United Nations
(UN) that is responsible for issues that concern information and communication technologies . The ITU coordinates the shared global use of the radio spectrum , promotes international cooperation in assigning satellite orbits , works to improve telecommunication infrastructure in the developing world, and assists in the development and coordination of worldwide technical standards
[...More...]

"International Telecommunication Union" on:
Wikipedia
Google
Yahoo

Band V
BAND V (meaning Band 5) is the name of a radio frequency range within the ultra high frequency part of the electromagnetic spectrum . It is not to be confused with the V band in the extremely high frequency part of the spectrum. Sources differ on the exact frequency range of UHF Band V. For example, the Broadcast engineer's reference book and the BBC
BBC
define the range as 614 to 854 MHz
MHz
. The IPTV India Forum define the range as 582 to 806 MHz
MHz
and the DVB Worldwide website refers to the range as 585 to 806 MHz
[...More...]

"Band V" on:
Wikipedia
Google
Yahoo

Band II
BAND or BAND may refer to: CONTENTS * 1 Science and technology * 2 Music * 3 Clothing, jewelry, and accessories * 4 Organizations * 5 Places * 6 Society and government * 7 Other uses * 8 See also SCIENCE AND TECHNOLOGY* Band (radio) , a range of frequencies or wavelengths in radio and radar, specifically: * Shortwave bands * UMTS frequency bands used for cellphones * LTE
[...More...]

"Band II" on:
Wikipedia
Google
Yahoo

Decametre
A DECAMETRE or DEKAMETRE (American spelling : DEKAMETER, earlier DECAMETER; symbol DAM, sometimes unofficially DM or DKM) is a very rarely used unit of length in the metric system , equal to ten metres . This measure is included in the SI mostly for completeness: in principle, any combination of prefix and unit can be written, but many are rarely used in practice. One practical use of the decameter is for altitude of geopotential heights in meteorology. Meteorologists also use another seldom encountered SI prefix: hecto- in hectopascal (hPa). The volumetric form (see below) cubic decametre is convenient for describing large volumes of water such as in rivers and lakes
[...More...]

"Decametre" on:
Wikipedia
Google
Yahoo

C Band (NATO)
BAND or BAND may refer to: CONTENTS * 1 Science and technology * 2 Music * 3 Clothing, jewelry, and accessories * 4 Organizations * 5 Places * 6 Society and government * 7 Other uses * 8 See also SCIENCE AND TECHNOLOGY* Band (radio) , a range of frequencies or wavelengths in radio and radar, specifically: * Shortwave bands * UMTS frequency bands used for cellphones * LTE
[...More...]

"C Band (NATO)" on:
Wikipedia
Google
Yahoo

Band VI
BAND or BAND may refer to: CONTENTS * 1 Science and technology * 2 Music * 3 Clothing, jewelry, and accessories * 4 Organizations * 5 Places * 6 Society and government * 7 Other uses * 8 See also SCIENCE AND TECHNOLOGY* Band (radio) , a range of frequencies or wavelengths in radio and radar, specifically: * Shortwave bands * UMTS frequency bands used for cellphones * LTE
[...More...]

"Band VI" on:
Wikipedia
Google
Yahoo

picture info

Megahertz
The HERTZ (symbol: Hz) is the derived unit of frequency in the International System of Units
International System of Units
(SI) and is defined as one cycle per second . It is named for Heinrich Rudolf Hertz
Hertz
, the first person to provide conclusive proof of the existence of electromagnetic waves . Hertz
Hertz
are commonly expressed in multiples : kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the unit's most common uses are in the description of sine waves and musical tones , particularly those used in radio - and audio-related applications. It is also used to describe the speeds at which computers and other electronics are driven
[...More...]

"Megahertz" on:
Wikipedia
Google
Yahoo

Band I
BAND I is a range of radio frequencies within the very high frequency (VHF) part of the electromagnetic spectrum . Band I ranges from 47 to 68 MHz
MHz
for the European Broadcasting
Broadcasting
Area, and from 54 to 88 MHz
MHz
for the Americas and it is primarily used for broadcasting service (television broadcasting ) in line to ITU Radio Regulations (article 1.38). Channel spacings vary from country to country, with spacings of 6, 7 and 8 MHz
MHz
being common
[...More...]

"Band I" on:
Wikipedia
Google
Yahoo

Band III
BAND III is the name of the range of radio frequencies within the very high frequency (VHF) part of the electromagnetic spectrum from 174 to 240 megahertz (MHz). It is primarily used for radio and television broadcasting. It is also called HIGH-BAND VHF, in contrast to Bands I and II. CONTENTS* 1 Broadcast Television
Television
* 1.1 North America * 1.2 Europe * 1.3 Russia and other former members of OIRT * 2 Radio
Radio
* 3 Worldwide usage * 3.1 Europe * 3.2 North America * 4 References BROADCAST TELEVISIONNORTH AMERICAThe band is subdivided into seven channels for television broadcasting, each occupying 6 MHz. CHANNEL FREQUENCY RANGE 7 174-180 MHz 8 180-186 MHz 9 186-192 MHz 10 192-198 MHz 11 198-204 MHz 12 204-210 MHz 13 210-216 MHzEUROPEEuropean Band III allocations vary from country to country, with channel widths of 7 or 8 MHz
[...More...]

"Band III" on:
Wikipedia
Google
Yahoo

picture info

Electromagnetic Wave
In physics , ELECTROMAGNETIC RADIATION (EM RADIATION or EMR) refers to the waves (or their quanta, photons ) of the electromagnetic field , propagating (radiating) through space-time, carrying electromagnetic radiant energy . It includes radio waves , microwaves , infrared , (visible) light , ultraviolet , X-rays , and gamma rays . " Classically , electromagnetic radiation consists of ELECTROMAGNETIC WAVES, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vacuum . The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave . The wavefront of electromagnetic waves emitted from a point source (such as a light bulb) is a sphere . The position of an electromagnetic wave within the electromagnetic spectrum could be characterized by either its frequency of oscillation or its wavelength
[...More...]

"Electromagnetic Wave" on:
Wikipedia
Google
Yahoo

picture info

High-frequency Trading
HIGH-FREQUENCY TRADING (HFT) is a type of algorithmic trading characterized by high speeds, high turnover rates, and high order-to-trade ratios that leverages high-frequency financial data and electronic trading tools. While there is no single definition of HFT, among its key attributes are highly sophisticated algorithms, co-location, and very short-term investment horizons. HFT can be viewed as a primary form of algorithmic trading in finance . Specifically, it is the use of sophisticated technological tools and computer algorithms to rapidly trade securities . HFT uses proprietary trading strategies carried out by computers to move in and out of positions in seconds or fractions of a second. Aldridge and Krawciw, 2017 estimate that in 2016 HFT on average initiated 10-40% of trading volume in equities, and 10-15% of volume in foreign exchange and commodities. Intraday, however, proportion of HFT may vary from 0% to 100% of short-term trading volume
[...More...]

"High-frequency Trading" on:
Wikipedia
Google
Yahoo

picture info

Electromagnetic Spectrum
The ELECTROMAGNETIC SPECTRUM is a collective term; referring to the entire range and scope of frequencies of electromagnetic radiation and their respective, associated photon wavelengths. The electromagnetic spectrum extends from below the low frequencies used for modern radio communication to gamma radiation at the short-wavelength (high-frequency) end, thereby covering wavelengths from thousands of kilometers down to a fraction of the size of an atom . Visible light lies toward the shorter end, with wavelengths from 400 to 700 nanometres . The limit for long wavelengths is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length . Until the middle of the 20th century it was believed by most physicists that this spectrum was infinite and continuous . Nearly all types of electromagnetic radiation can be used for spectroscopy , to study and characterize matter
[...More...]

"Electromagnetic Spectrum" on:
Wikipedia
Google
Yahoo

picture info

Terahertz Radiation
TERAHERTZ RADIATION – also known as SUBMILLIMETER RADIATION, TERAHERTZ WAVES, TREMENDOUSLY HIGH FREQUENCY, T-RAYS, T-WAVES, T-LIGHT, T-LUX or THZ – consists of electromagnetic waves within the ITU -designated band of frequencies from 0.3 to 3 terahertz (THz; 1 THz = 1012 Hz ). Wavelengths of radiation in the terahertz band correspondingly range from 1 mm to 0.1 mm (or 100 μm ). Because terahertz radiation begins at a wavelength of one millimeter and proceeds into shorter wavelengths, it is sometimes known as the submillimeter band, and its radiation as submillimeter waves, especially in astronomy. Terahertz radiation
Terahertz radiation
occupies a middle ground between microwaves and infrared light waves known as the terahertz gap , where technology for its generation and manipulation is in its infancy
[...More...]

"Terahertz Radiation" on:
Wikipedia
Google
Yahoo

J Band (NATO)
The NATO J BAND is the obsolete designation given to the radio frequencies from 10 to 20 GHz
GHz
(equivalent to wavelengths between 3 and 1.5 cm) during the cold war period. Since 1992 frequency allocations, allotment and assignments are in line to NATO Joint Civil/Military Frequency Agreement (NJFA). However, in order to identify military radio spectrum requirements, e.g. for crises management planning, training, Electronic warfare
Electronic warfare
activities, or in military operations, this system is still in use
[...More...]

"J Band (NATO)" on:
Wikipedia
Google
Yahoo
.