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searching for Radio Waves (radio station) 199 found (1467 total)

alternate case: radio Waves (radio station)

Radio wave (849 words) [view diff] no match in snippet view article find links to article

Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have
Radio Waves (Bob & Tom album) (89 words) [view diff] no match in snippet view article
Radio Waves is a comedy album by The Bob & Tom Show, which was not released to the general public but only to men and women serving overseas in the US
Radio Waves (song) (174 words) [view diff] no match in snippet view article
"Radio Waves" is the opening track from Roger Waters' second solo studio album, Radio K.A.O.S. It was chosen as the lead single for the album, released
Jet Black & Jealous (422 words) [view diff] no match in snippet view article find links to article
Top 20 hit with a peak of #11. The album's third and fourth singles, "Radio Waves" and "Guinevere," peaked at #35 and #45, respectively. Andrew Leahey
Transmitter (1,622 words) [view diff] no match in snippet view article find links to article
is an electronic device which, with the aid of an antenna, produces radio waves. The transmitter itself generates a radio frequency alternating current
Radio station (1,310 words) [view diff] no match in snippet view article find links to article
station is a set of equipment necessary to carry on communication via radio waves. Generally, it is a receiver and/or transmitter, an antenna, and some
Radio (6,352 words) [view diff] no match in snippet view article find links to article
other uses, see Radio (disambiguation). Radio is the use of radio waves is to carry information, such as sound, by systematically modulating
Kennelly–Heaviside layer (707 words) [view diff] no match in snippet view article find links to article
Earth's ionosphere. It reflects medium-frequency radio waves, and because of this reflection, radio waves can be propagated beyond the horizon. Propagation
Ground station (839 words) [view diff] no match in snippet view article find links to article
part of the ground segment of the spacecraft system), or reception of radio waves from astronomical radio sources. Ground stations may be located either
Ultra high frequency (2,186 words) [view diff] no match in snippet view article find links to article
decimetre band as the wavelengths range from one meter to one decimetre. Radio waves with frequencies above the UHF band fall into the SHF (super-high frequency)
Parabolic antenna (3,763 words) [view diff] no match in snippet view article find links to article
surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a
Experimental radio station (97 words) [view diff] no match in snippet view article find links to article
Union´s (ITU) ITU Radio Regulations (RR) – defined as «A station utilizing radio waves in experiments with a view to the development of science or technique
Radiation (5,425 words) [view diff] no match in snippet view article find links to article
a material medium. This includes: electro-magnetic radiation such as radio waves, visible light, x-rays, and gamma radiation (γ) particle radiation such
Monopole antenna (1,318 words) [view diff] no match in snippet view article find links to article
monopole is a resonant antenna; the rod functions as an open resonator for radio waves, oscillating with standing waves of voltage and current along its length
Karl Guthe Jansky (1,564 words) [view diff] no match in snippet view article find links to article
American physicist and radio engineer who in August 1931 first discovered radio waves emanating from the Milky Way. He is considered one of the founding figures
Radio propagation (4,141 words) [view diff] no match in snippet view article find links to article
Radio propagation is the behavior of radio waves when they are transmitted, or propagated from one point on the Earth to another, or into various parts
GRB 970508 (2,829 words) [view diff] no match in snippet view article find links to article
radio signals, astronomer Dale Frail calculated that the source of the radio waves had expanded almost at the speed of light. This provided strong evidence
Passive radiator (659 words) [view diff] no match in snippet view article find links to article
of the parasitic elements is to modify the radiation pattern of the radio waves emitted by the driven element, directing them in a beam in one direction
High frequency (1,579 words) [view diff] no match in snippet view article find links to article
designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 MHz. It is also known as the decameter band or decameter
ARIANNA Experiment (126 words) [view diff] no match in snippet view article find links to article
surface area. There, the ice-water interface below the shelf reflects radio waves, giving ARIANNA sensitivity to downward going neutrinos and improving
Alexander Stepanovich Popov (1,903 words) [view diff] no match in snippet view article find links to article
Russian Federation as Radio Day. In a March 24, 1896 demonstration he used radio waves to transmit a message between different campus buildings in St Petersburg
Frequency (1,852 words) [view diff] no match in snippet view article find links to article
vibratory phenomena, such as mechanical vibrations, audio (sound) signals, radio waves, and light. For cyclical processes, such as rotation, oscillations
Radio Waves (Seigmen album) (95 words) [view diff] no match in snippet view article
Radio Waves is the final studio album by Norwegian rock band Seigmen. It is sung entirely in English. The album came in two editions: a limited edition
Radiodetermination station (284 words) [view diff] no match in snippet view article find links to article
of radio waves in order to determine the location of a object, under the condition that this thing is reflecting and/or transmitting radio waves. This
Broadcasting (2,486 words) [view diff] no match in snippet view article find links to article
communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model. Broadcasting began with AM radio broadcasting
S band (625 words) [view diff] no match in snippet view article find links to article
the electromagnetic spectrum. It is defined by an IEEE standard for radio waves with frequencies that range from 2 to 4 GHz, crossing the conventional
Skywave (1,716 words) [view diff] no match in snippet view article find links to article
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically
Feed horn (354 words) [view diff] no match in snippet view article find links to article
dishes, a feedhorn (or feed horn) is a small horn antenna used to convey radio waves between the transmitter and/or receiver and the parabolic reflector.
Astronomical radio source (1,572 words) [view diff] no match in snippet view article find links to article
Astronomical radio sources are objects in outer space that emit strong radio waves. Radio emission comes from a wide variety of sources. Such objects represent
GRB 970228 (2,386 words) [view diff] no match in snippet view article find links to article
GRBs to be followed by a lower-energy afterglow (in wavelengths such as radio waves, x-rays, and even visible light), but until this event, GRBs had only
Radar (9,848 words) [view diff] no match in snippet view article find links to article
(disambiguation). Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used
Optical pulsar (124 words) [view diff] no match in snippet view article find links to article
detected by stroboscipic techniques in 1969, shortly after its discovery in radio waves, at the Steward Observatory. The Vela pulsar was detected in 1977 at
Microwave (3,476 words) [view diff] no match in snippet view article find links to article
infrared, terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields
Radio receiver (2,471 words) [view diff] no match in snippet view article find links to article
receives radio waves and converts the information carried by them to a usable form. It is used with an antenna. The antenna intercepts radio waves (electromagnetic
Solaren (262 words) [view diff] no match in snippet view article find links to article
placed in Earth's orbit.The satellite would convert this energy into radio waves and send it to a receiving station in Fresno County, California. The
Astronomy (8,193 words) [view diff] no match in snippet view article find links to article
amplitude and phase of radio waves, whereas this is not as easily done at shorter wavelengths. Although some radio waves are produced by astronomical
Henri Abraham (891 words) [view diff] no match in snippet view article find links to article
contributions to the science of radio waves. He performed some of the first measurements of the propagation velocity of radio waves, helped develop France's
Antenna (radio) (14,267 words) [view diff] no match in snippet view article
or aerial, is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio
Electromagnetic radiation (8,517 words) [view diff] no match in snippet view article find links to article
other familiar forms are invisible electromagnetic radiations, such as radio waves, infrared light and X rays. Classically, electromagnetic radiation consists
Sudden ionospheric disturbance (438 words) [view diff] no match in snippet view article find links to article
recorded and indicate when solar flares have taken place. Short wave radio waves (in the HF range) are absorbed by the increased particles in the low
Antenna aperture (1,205 words) [view diff] no match in snippet view article find links to article
is a measure of how effective an antenna is at receiving the power of radio waves. The aperture is defined as the area, oriented perpendicular to the direction
Radio broadcasting (3,548 words) [view diff] no match in snippet view article find links to article
Radio broadcasting is a unidirectional wireless transmission over radio waves intended to reach a wide audience. Stations can be linked in radio networks
Very high frequency (2,372 words) [view diff] no match in snippet view article find links to article
designation for the range of radio frequency electromagnetic waves (radio waves) from 30 MHz to 300 MHz, with corresponding wavelengths of ten to one
Extremely low frequency (2,730 words) [view diff] no match in snippet view article find links to article
frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz, and corresponding wavelengths from
Westerhout 43 (458 words) [view diff] no match in snippet view article find links to article
wavelengths that are not affected by it, such as the infrared or the radio waves. This star-forming region is located in the 5-kpc ring, a ring with
Apex (radio band) (489 words) [view diff] no match in snippet view article
Communications Commission thought initially that very high frequency (VHF) radio waves would have a small, discrete range, and would allow two or more stations
Offset dish antenna (425 words) [view diff] no match in snippet view article find links to article
radio waves. In an ordinary front-fed dish antenna, the feed structure and its supports are located in the path of the incoming beam of radio waves,
Helical antenna (1,211 words) [view diff] no match in snippet view article find links to article
the helix, along the antenna's axis. It radiates circularly polarised radio waves. These are used for satellite communication. If the circumference
Ionosphere (4,566 words) [view diff] no match in snippet view article find links to article
(MF) and lower high frequency (HF) radio waves are significantly damped within the D layer, as the passing radio waves cause electrons to move, which then
Radiophysics (219 words) [view diff] no match in snippet view article find links to article
with matter. The term is used in the following major meanings: study of radio waves (the original area of research) study of radiation used in radiology
Maximum usable frequency (413 words) [view diff] no match in snippet view article find links to article
propagation is for the radio waves to reflect off the ionized layers of the atmosphere and return diagonally back to Earth. In this way radio waves can travel beyond
Wireless telegraphy (8,037 words) [view diff] no match in snippet view article find links to article
historical term for early radio telegraphy systems which communicated with radio waves, although when the term originated in the late 1800s it was also used
Antenna feed (298 words) [view diff] no match in snippet view article find links to article
antenna which feed the radio waves to the rest of the antenna structure, or in receiving antennas collect the incoming radio waves, convert them to electric
Patch antenna (255 words) [view diff] no match in snippet view article find links to article
transmission line with a length of approximately one-half wavelength of the radio waves. The radiation mechanism arises from discontinuities at each truncated
Phase modulation (421 words) [view diff] no match in snippet view article find links to article
of a carrier wave. Phase modulation is widely used for transmitting radio waves and is an integral part of many digital transmission coding schemes that
Telecommunication (7,970 words) [view diff] no match in snippet view article find links to article
waves, ultraviolet light, and radio waves. This last channel is called the "free space channel". The sending of radio waves from one place to another has
Critical hours (273 words) [view diff] no match in snippet view article find links to article
Hours are required to do so because this is when the propagation of radio waves changes from groundwave to skywave (at sunset) or vice versa (at sunrise)
Kosmos 119 (275 words) [view diff] no match in snippet view article find links to article
by the Yuzhnoye Design Bureau, and was used to study the effects on radio waves of passing through the ionosphere. A Kosmos-2I 63SM carrier rocket was
Slot antenna (250 words) [view diff] no match in snippet view article find links to article
driving frequency, determine the radiation distribution pattern. Often the radio waves are provided by a waveguide, and the antenna consists of slots in the
Essaim (satellite) (194 words) [view diff] no match in snippet view article
intelligence across the world. The DGA describes it as a "vacuum cleaner for [radio] waves". Essaim is a constellation of four 120 kg micro satellites (including
Random wire antenna (829 words) [view diff] no match in snippet view article find links to article
ground, whose length does not bear a relation to the wavelength of the radio waves used, but is typically chosen more for convenience. The wire may be straight
Kosmos 259 (274 words) [view diff] no match in snippet view article find links to article
by the Yuzhnoye Design Bureau, and was used to study the effects on radio waves of passing through the ionosphere. A Kosmos-2I 63SM carrier rocket was
Radio K.A.O.S. (2,424 words) [view diff] no match in snippet view article find links to article
David in Los Angeles, California, USA. Since Billy can hear radio waves in his head ("Radio Waves" – track 1), he begins to explore the cordless phone, recognising
Skip distance (213 words) [view diff] no match in snippet view article find links to article
distance is a distance on the Earth's surface between the two points where radio waves from a transmitter, refracted downwards by different layers of the ionosphere
Electromagnetic spectrum (4,421 words) [view diff] no match in snippet view article find links to article
Hertz built an apparatus to generate and detect what are now called radio waves. Hertz found the waves and was able to infer (by measuring their wavelength
Radio spectrum (470 words) [view diff] no match in snippet view article find links to article
transmission, emission and/or reception of radio waves for specific telecommunication purposes of radio waves is strictly regulated by the national administration
Turnstile antenna (1,135 words) [view diff] no match in snippet view article find links to article
possible modes. In normal mode the antenna radiates horizontally polarized radio waves perpendicular to its axis. In axial mode the antenna radiates circularly
Ground plane (1,011 words) [view diff] no match in snippet view article find links to article
the transmitter's ground wire and serves as a reflecting surface for radio waves. In printed circuit boards, a ground plane is a large area of copper
Radio astronomy (2,791 words) [view diff] no match in snippet view article find links to article
studies celestial objects at radio frequencies. The initial detection of radio waves from an astronomical object was made in the 1930s, when Karl Jansky observed
Super high frequency (870 words) [view diff] no match in snippet view article find links to article
ten centimetres. These frequencies fall within the microwave band, so radio waves with these frequencies are called microwaves. The small wavelength of
Fire-control radar (717 words) [view diff] no match in snippet view article find links to article
hit the target(s)). A typical radar emits a narrow, intense beam of radio waves to ensure accurate tracking information and to minimize the chance of
Hokusai (crater) (251 words) [view diff] no match in snippet view article
impact ejecta has a rough surface, which leads to strong scattering of radio waves. Hokusai is named after Katsushika Hokusai (1760–1849), a Japanese artist
Debussy (crater) (234 words) [view diff] no match in snippet view article
fresh and rough surfaces of young impact craters are good scatterers of radio waves. Debussy is named after Claude Debussy (1862–1918), one of the most
IRAS 18162−2048 (217 words) [view diff] no match in snippet view article find links to article
In 2010 HH 80–81 jet of IRAS 18162-2048 were found to emit polarized radio waves, which indicated that they were produced by relativistic electrons moving
Contactless smart card (2,130 words) [view diff] no match in snippet view article find links to article
store and sometimes process data and communicate with a terminal via radio waves. There are two broad categories of contactless smart cards. Memory cards
Frequency of optimum transmission (131 words) [view diff] no match in snippet view article find links to article
Frequency of optimum transmission (FOT), in the transmission of radio waves via ionospheric reflection, is the highest effective (i.e. working) frequency
Interplanetary scintillation (1,128 words) [view diff] no match in snippet view article find links to article
interplanetary scintillation refers to random fluctuations in the intensity of radio waves of celestial origin, on the timescale of a few seconds. It is analogous
Visible-light astronomy (410 words) [view diff] no match in snippet view article find links to article
invisible types of light in the electromagnetic radiation spectrum, such as radio waves, infrared waves, ultraviolet waves, X-ray waves and gamma-ray waves.
Rectenna (864 words) [view diff] no match in snippet view article find links to article
are used in wireless power transmission systems that transmit power by radio waves. A simple rectenna element consists of a dipole antenna with an RF diode
Super low frequency (360 words) [view diff] no match in snippet view article find links to article
low frequency (SLF) is the ITU designation for electromagnetic waves (radio waves) in the frequency range between 30 hertz and 300 hertz. They have corresponding
KXRX (448 words) [view diff] no match in snippet view article find links to article
Seattle Weekly wrote that Norman B. was "stirring up the Sunday night radio waves" and "breaking the sound barrier." Prompted by the success of "Seattle
Electric current (4,222 words) [view diff] no match in snippet view article find links to article
electric currents flow at the correct voltages within radio antennas, radio waves are generated. In electronics, other forms of electric current include
Radiolocation (1,293 words) [view diff] no match in snippet view article find links to article
the process of finding the location of something through the use of radio waves. It generally refers to passive uses, particularly radar—as well as detecting
Extremely high frequency (1,893 words) [view diff] no match in snippet view article find links to article
low (or far) infrared light, also referred to as terahertz radiation. Radio waves in this band have wavelengths from ten to one millimetre, giving it the
Magnetic resonance imaging of the brain (831 words) [view diff] no match in snippet view article find links to article
resonance imaging (MRI) of the nervous system uses magnetic fields and radio waves to produce high quality two- or three-dimensional images of nervous system
Ephemeralization (617 words) [view diff] no match in snippet view article find links to article
"visual" to "abstract electrical" (i.e., nonsensorial radiation, such as radio waves, x rays, etc.). Length measurement technologies in human development
KXXT (563 words) [view diff] no match in snippet view article find links to article
interfere with other radio stations also operating on 1010 kHz. (AM radio waves travel farther at night.) After sunset, it may be hard to hear KXXT much
Bo Thidé (491 words) [view diff] no match in snippet view article find links to article
Thidé (born in Gothenburg, Sweden) is a Swedish physicist who studies radio waves and other electromagnetic radiation in space, particularly their interaction
Medical optical imaging (749 words) [view diff] no match in snippet view article find links to article
electromagnetic wave, similar phenomena occur in X-rays, microwaves, radio waves. Chemical imaging or molecular imaging involves inference from the deflection
Dielectric resonator antenna (819 words) [view diff] no match in snippet view article find links to article
the dielectric resonator, mounted on a metal surface, a ground plane. Radio waves are introduced into the inside of the resonator material from the transmitter
Non-ionizing radiation (2,301 words) [view diff] no match in snippet view article find links to article
are correct. Near ultraviolet, visible light, infrared, microwave, radio waves, and low-frequency radio frequency (longwave) are all examples of non-ionizing
Collinear antenna array (253 words) [view diff] no match in snippet view article find links to article
toward the earth, where it is wasted. They radiate vertically polarized radio waves. Theoretically, when stacking idealised lossless dipole antennas in such
Corner reflector antenna (584 words) [view diff] no match in snippet view article find links to article
on the 144, 420, and 1296 MHz bands. They radiate linearly polarized radio waves and can be mounted for either horizontal or vertical polarization. The
Cassegrain antenna (1,275 words) [view diff] no match in snippet view article find links to article
secondary reflector suspended in front of the primary reflector. The beam of radio waves from the feed illuminates the secondary reflector, which reflects it
Speed of light (13,006 words) [view diff] no match in snippet view article find links to article
materials, such as glass or air, is less than c; similarly, the speed of radio waves in wire cables is slower than c. The ratio between c and the speed v
Main lobe (269 words) [view diff] no match in snippet view article find links to article
zero. In a directional antenna in which the objective is to emit the radio waves in one direction, the lobe in that direction is designed to be bigger
Low frequency (1,856 words) [view diff] no match in snippet view article find links to article
kilometres, it is also known as the kilometre band or kilometre wave. LF radio waves exhibit low signal attenuation, making them suitable for long-distance
Stub (electronics) (1,020 words) [view diff] no match in snippet view article
of radio waves along their length. Their reactive properties are determined by their physical length in relation to the wavelength of the radio waves. Therefore
Kosmos 142 (287 words) [view diff] no match in snippet view article find links to article
by the Yuzhnoye Design Bureau, and was used to study the effects on radio waves of passing through the ionosphere. A Kosmos-2I 63SM carrier rocket was
Low frequency (1,856 words) [view diff] no match in snippet view article find links to article
kilometres, it is also known as the kilometre band or kilometre wave. LF radio waves exhibit low signal attenuation, making them suitable for long-distance
Klystron (2,951 words) [view diff] no match in snippet view article find links to article
particle accelerators. In the klystron, an electron beam interacts with the radio waves as it passes through resonant cavities, metal boxes along the length
Dark nebula (412 words) [view diff] no match in snippet view article find links to article
interstellar dust or material, things it obscures are only visible using radio waves in radio astronomy or infrared in infrared astronomy. Dark clouds appear
Corner reflector (944 words) [view diff] no match in snippet view article find links to article
square shapes. Radar corner reflectors made of metal are used to reflect radio waves from radar sets. Optical corner reflectors, called corner cubes, made
Radiotrope (46 words) [view diff] no match in snippet view article find links to article
radio frequency seeking robots. More accurately, radiotropes can either seek (radiophiles) or flee (radiophobes) sources of radio waves.[citation needed]
Conformal antenna (415 words) [view diff] no match in snippet view article find links to article
microprocessor (computer). By controlling the phase, the nondirectional radio waves emitted by the individual antennas can be made to combine in front of
Passband (582 words) [view diff] no match in snippet view article find links to article
filter to select the frequency of the desired radio signal out of all the radio waves picked up by its antenna. The passband of a receiver is the range of
Radionics (999 words) [view diff] no match in snippet view article find links to article
disease can be diagnosed and treated with a kind of energy similar to radio waves. The concept behind radionics originated in the early 1900s with Albert
Driven element (418 words) [view diff] no match in snippet view article find links to article
transmitter, and is the source of the radio waves. In a receiving antenna it collects the incoming radio waves for reception, and converts them to tiny
Horn antenna (3,018 words) [view diff] no match in snippet view article find links to article
that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies
Microwave transmission (3,083 words) [view diff] no match in snippet view article find links to article
frequencies without interfering with each other, as lower frequency radio waves do. Another advantage is that the high frequency of microwaves gives
Waveguide (electromagnetism) (3,497 words) [view diff] no match in snippet view article
original and most common meaning is a hollow metal pipe used to carry radio waves. This type of waveguide is used as a transmission line mostly at microwave
Radio astronomy service (216 words) [view diff] no match in snippet view article find links to article
astronomy.» Subject of this radiocommunication service is to receive radio waves transmitte by astronomical or celestical objects. See also Main articles:
Terrestrial television (1,736 words) [view diff] no match in snippet view article find links to article
television broadcasting in which the television signal is transmitted by radio waves to the TV receiver from a terrestrial (Earth based) transmitter, a television
Radio noise source (57 words) [view diff] no match in snippet view article find links to article
A radio noise source is a device that emits radio waves at a certain frequency, used to calibrate radio telescopes such that received data may be compared
Faraday cage (1,869 words) [view diff] no match in snippet view article find links to article
devices that produce RFI, such as radio transmitters, to prevent their radio waves from interfering with other nearby equipment. They are also used to protect
Image antenna (379 words) [view diff] no match in snippet view article find links to article
antenna is an electrical mirror-image of an antenna element formed by the radio waves reflecting from a conductive surface called a ground plane, such as the
Demeter (satellite) (460 words) [view diff] no match in snippet view article
invariant latitude. DEMETER observed an increase in ultra low frequency radio waves in the month before the 2010 Haiti earthquake. During the 2010 eruption
Heinrich Hertz (3,244 words) [view diff] no match in snippet view article find links to article
dipole antenna. This experiment produced and received what are now called radio waves in the very high frequency range. Between 1886 and 1889 Hertz
Conductive keratoplasty (113 words) [view diff] no match in snippet view article find links to article
Conductive keratoplasty (CK) is a type of refractive surgery that uses radio waves to adjust the contour of the cornea by shrinking the corneal collagen
Samos-F (228 words) [view diff] no match in snippet view article find links to article
the 1960s. Initial priorities (in decreasing order) were to monitor radio waves in the frequency bands 2.5-3.2 GHz (S band), 9.0–10 GHz (X band), and
Radiation pattern (1,635 words) [view diff] no match in snippet view article find links to article
refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source. Particularly in the fields of fiber
Arnold Wilkins (558 words) [view diff] no match in snippet view article find links to article
Wilkins who suggested to his boss, Robert Watson Watt, that reflected radio waves might be used to detect aircraft, and his idea led to the initial steps
Radiocommunication service (399 words) [view diff] no match in snippet view article find links to article
“a service…involving the transmission, emission and/or reception of radio waves for specific telecommunication purposes”. Radiocommunication is sub-divided
Compact intracloud discharge (56 words) [view diff] no match in snippet view article find links to article
bipolar event (NBE), is an intensive form of lightning that produces radio waves and no visible light. Lasting only a few millionths of a second, these
Optics and Spectroscopy (54 words) [view diff] no match in snippet view article find links to article
1956. It covers research on spectroscopy of electromagnetic waves, from radio waves till X-rays, and related topics in optics, including quantum optics.
Surface wave (2,648 words) [view diff] no match in snippet view article find links to article
masses of different densities. Ground waves refer to the propagation of radio waves parallel to and adjacent to the surface of the Earth, following the curvature
Counterpoise (ground system) (942 words) [view diff] no match in snippet view article
sensitive to ground resistance. Because of the large wavelength of the radio waves, feasible antennas used at these frequencies are electrically short,
Nantenna (3,176 words) [view diff] no match in snippet view article find links to article
which is used to convert radio waves into direct current electricity. Light is composed of electromagnetic waves like radio waves, but of much smaller wavelength
Electricity (8,481 words) [view diff] no match in snippet view article find links to article
permits the creation and reception of electromagnetic radiation such as radio waves. In electricity, charges produce electromagnetic fields which act on
Non-line-of-sight propagation (4,088 words) [view diff] no match in snippet view article find links to article
visually obstructing material, thus leaving sufficient transmission for radio waves to be detected There are many electrical characteristics of the transmission
Intentional radiator (46 words) [view diff] no match in snippet view article find links to article
intentional radiator is any device that is deliberately designed to produce radio waves. Radio transmitters of all kinds, including the garage door opener, cordless
Antenna gain (1,957 words) [view diff] no match in snippet view article find links to article
power into radio waves headed in a specified direction. As a receiving antenna, the gain describes how well the antenna converts radio waves arriving from
X-ray pulsar-based navigation (228 words) [view diff] no match in snippet view article find links to article
position accurately (±5 km). The advantage of using X-ray signals over radio waves is that X-ray telescopes can be made smaller and lighter. SEXTANT (Station
Pictor A (130 words) [view diff] no match in snippet view article find links to article
constellation Pictor, is a double-lobed radio galaxy and a powerful source of radio waves in the Southern Celestial Hemisphere. From a supermassive black hole
Laser jammer (386 words) [view diff] no match in snippet view article find links to article
these jammers focus on blocking light emitted from laser guns, and not radio waves from radar guns, US federal laws prohibiting the use of radar jammers
Datacasting (1,178 words) [view diff] no match in snippet view article find links to article
(data broadcasting) is the broadcasting of data over a wide area via radio waves. It most often refers to supplemental information sent by television
Transmission medium (1,032 words) [view diff] no match in snippet view article find links to article
constitute a transmission medium for electromagnetic waves such as light and radio waves. While material substance is not required for electromagnetic waves to
Vertical plane (192 words) [view diff] no match in snippet view article find links to article
plane to encourage skywave propagation, which would refract or reflect radio waves off the ionosphere and back to the ground at a great distance from the
Construction permit (360 words) [view diff] no match in snippet view article find links to article
and that as many groups as possible have access to free speech over radio waves. In the England and Wales, erecting a radio transmitter would be subject
Outline of radio (300 words) [view diff] no match in snippet view article find links to article
radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating
Radiodetermination (134 words) [view diff] no match in snippet view article find links to article
relating to these parameters, by means of the propagation properties of radio waves.» There are two main fields to radiodetermination: radiolocation, which
Magnetosphere of Jupiter (7,898 words) [view diff] no match in snippet view article find links to article
is a powerful source of radio waves in the spectral region stretching from several kilohertz to tens of megahertz. Radio waves with frequencies of less
Batteryless radio (444 words) [view diff] no match in snippet view article find links to article
require a power source at all, except for the power that they receive from radio waves. The line-operated vacuum tube receiver was invented in 1925 by Edward
Primeval Structure Telescope (330 words) [view diff] no match in snippet view article find links to article
spectrum, and it is observed frequently in radio astronomy, since those radio waves can penetrate the large clouds of interstellar cosmic dust that are opaque
Line-of-sight propagation (1,641 words) [view diff] no match in snippet view article find links to article
"radio horizon". In practice, the propagation characteristics of these radio waves vary substantially depending on the exact frequency and the strength
William Eccles (470 words) [view diff] no match in snippet view article find links to article
theory that a conducting layer of the upper atmosphere could reflect radio waves around the curvature of the Earth, thus enabling their transmission over
Demodulation (1,024 words) [view diff] no match in snippet view article find links to article
communicate audio (sound) but transmitted information in the form of pulses of radio waves that represented text messages in Morse code. Therefore, the receiver
Auroral chorus (325 words) [view diff] no match in snippet view article find links to article
responsible for the auroras. The electromagnetic waves are a type of natural radio waves, vibrations of electric and magnetic energy occurring at the same frequency
Radome (897 words) [view diff] no match in snippet view article find links to article
by the antenna. In other words, the radome is transparent to radar or radio waves. Radomes protect the antenna surfaces from weather and conceal antenna
William Eccles (470 words) [view diff] no match in snippet view article find links to article
theory that a conducting layer of the upper atmosphere could reflect radio waves around the curvature of the Earth, thus enabling their transmission over
Auroral chorus (325 words) [view diff] no match in snippet view article find links to article
responsible for the auroras. The electromagnetic waves are a type of natural radio waves, vibrations of electric and magnetic energy occurring at the same frequency
Adcock antenna (690 words) [view diff] no match in snippet view article find links to article
vertical elements which can be used to transmit or receive directional radio waves. The Adcock array was invented and patented by British engineer Frank
Lecher lines (1,830 words) [view diff] no match in snippet view article find links to article
of parallel wires or rods that were used to measure the wavelength of radio waves, mainly at UHF and microwave frequencies. They form a short length of
Curtain array (1,171 words) [view diff] no match in snippet view article find links to article
long-distance skywave (or skip) transmission; they transmit a beam of radio waves at a shallow angle into the sky, which is reflected by the ionosphere
Dubbed and Freq'd: A Remix Project (75 words) [view diff] no match in snippet view article find links to article
albums Portable Sounds and Tonight. The album art is a mixture of the radio waves from the Portable Sounds album cover mixed with the buildings on the
Broadcast range (1,287 words) [view diff] no match in snippet view article find links to article
service area that a broadcast station or other transmission covers via radio waves (or possibly infrared light, which is closely related). It is generally
Cable television (2,634 words) [view diff] no match in snippet view article find links to article
television, in which the television signal is transmitted over the air by radio waves and received by a television antenna attached to the television. FM radio
Sigma Coronae Borealis (400 words) [view diff] no match in snippet view article find links to article
and are classed as RS Canum Venaticorum variables. The system emits radio waves. Much further away, at a distance of 14,000 astronomical units (AU),
Crab Nebula (4,805 words) [view diff] no match in snippet view article find links to article
2 times per second, which emits pulses of radiation from gamma rays to radio waves. At X-ray and gamma ray energies above 30 keV, the Crab is generally
Antenna boresight (158 words) [view diff] no match in snippet view article find links to article
changing the angle of the boresight by shifting the relative phase of the radio waves emitted by different antenna elements, and even radiate beams in multiple
Sunset Strip (song) (178 words) [view diff] no match in snippet view article
vegetable. However, Billy is highly intelligent and gifted, and can hear radio waves in his head. He begins to explore the cordless phone, recognizing its
Dummy load (953 words) [view diff] no match in snippet view article find links to article
to allow the transmitter to be adjusted and tested without radiating radio waves. In audio systems a dummy load is connected to the output of an amplifier
Sutton Common BT Tower (186 words) [view diff] no match in snippet view article find links to article
happen due to interruption that may have been caused by the blades to the radio waves.[citation needed] British Telecom microwave network Telecommunications
Skip zone (410 words) [view diff] no match in snippet view article find links to article
When using medium to high frequency radio telecommunication, there are radio waves which travel both parallel to the ground, and towards the ionosphere
Breakthrough Listen (883 words) [view diff] no match in snippet view article find links to article
1-to-10 GHz range, the so-called "quiet zone" in the spectrum where radio waves are unobscured by cosmic sources or Earth’s atmosphere. The radio telescopes
Sea interferometry (530 words) [view diff] no match in snippet view article find links to article
as Sea-cliff interferometry, is a form of radio astronomy that uses radio waves reflected off the sea to produce an interference pattern. It is the radio
Large Millimeter Telescope (702 words) [view diff] no match in snippet view article find links to article
single-aperture telescope in its frequency range, built for observing radio waves in the wave lengths from approximately 0.85 to 4 mm. It has an active
Reflective array antenna (1,498 words) [view diff] no match in snippet view article find links to article
elements are mounted in front of a flat surface designed to reflect the radio waves in a desired direction. They are often used in the VHF and UHF frequency
Flare star (926 words) [view diff] no match in snippet view article find links to article
atmospheres. The brightness increase is across the spectrum, from X rays to radio waves. The first known flare stars (V1396 Cygni and AT Microscopii) were discovered
Born approximation (516 words) [view diff] no match in snippet view article find links to article
incident field, in the scatterer. For example, the radar scattering of radio waves by a light styrofoam column can be approximated by assuming that each
Cordless (247 words) [view diff] no match in snippet view article find links to article
"wireless" generally refers to devices that use some form of energy (e.g., radio waves, infrared, ultrasonic, etc.) to transfer information or commands over
FM broadcast band (2,545 words) [view diff] no match in snippet view article find links to article
widespread even in North America until the 1960s. Frequency-modulated radio waves can be generated at any frequency. All the bands mentioned in this article
Luxemburg–Gorky effect (150 words) [view diff] no match in snippet view article find links to article
Luxemburg–Gorky effect is a phenomenon of cross modulation between two radio waves, one of which is strong, passing through the same part of a medium, especially
Dielectric resonator (1,293 words) [view diff] no match in snippet view article find links to article
material, usually ceramic, that is designed to function as a resonator for radio waves, generally in the microwave and millimeter wave bands. The microwaves
Tropospheric scatter (1,747 words) [view diff] no match in snippet view article find links to article
method of propagation uses the tropospheric scatter phenomenon, where radio waves at particular frequencies are randomly scattered as they pass through
Beam waveguide antenna (669 words) [view diff] no match in snippet view article find links to article
a particular type of large steerable parabolic antenna in which the radio waves are transported in a beam between the movable dish and the stationary
Radar altimeter (2,107 words) [view diff] no match in snippet view article find links to article
beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to reflect from the ground and return to the plane. This type of altimeter
Baby monitor (905 words) [view diff] no match in snippet view article find links to article
with a microphone, placed near to the child. It transmits the sounds by radio waves to a receiver unit with a speaker carried by, or near to, the person
Cosmic noise (220 words) [view diff] no match in snippet view article find links to article
from Earth, emit electromagnetic waves in its full spectrum including radio waves. We can also hear the fall of a meteorite in a radio receiver; as the
Denpa teki na Kanojo (426 words) [view diff] no match in snippet view article find links to article
Year Awards in 2003. The Japanese term denpa originally referred to radio waves, but in slang usage it refers to people who perceive things ordinary
Pulsar (5,010 words) [view diff] no match in snippet view article find links to article
interstellar plasma, lower-frequency radio waves travel through the medium slower than higher-frequency radio waves. The resulting delay in the arrival
Tyndall effect (842 words) [view diff] no match in snippet view article find links to article
wavelength dependency is that longwave electromagnetic waves such as radio waves are able to pass through the walls of buildings, while shortwave electromagnetic
Light (5,594 words) [view diff] no match in snippet view article find links to article
whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and
Rhythmic contemporary (488 words) [view diff] no match in snippet view article find links to article
Rhythmic contemporary format through the years. Rhythmic (chart) "RADIO WAVES / Polling the Kiddies To Grab More Ads". Newsday.  BDS Rhythmic reporting
Terrain masking (335 words) [view diff] no match in snippet view article find links to article
positioning the aircraft so there is natural earth hiding it from the radio waves sent from the radar system. For instance, suppose a radar transmitter
Electromagnetic shielding (1,485 words) [view diff] no match in snippet view article find links to article
also known as RF shielding. The shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. A conductive enclosure
Technical surveillance counter-measures (809 words) [view diff] no match in snippet view article find links to article
information, whether data, video, or voice, through the air by using radio waves. The standard counter-measure for bugs of this nature is to search for
Radio star (320 words) [view diff] no match in snippet view article find links to article
of microwaves. The Sun, the nearest star to Earth, is known to emit radio waves, though it is virtually the only regular star that has been detected
Tactical Data Link (224 words) [view diff] no match in snippet view article find links to article
(TDL) uses a data link standard in order to provide communication via radio waves or cable used by the U.S. armed forces and NATO nations. All military
Hydrogen line (1,882 words) [view diff] no match in snippet view article find links to article
spectrum, and it is observed frequently in radio astronomy, since those radio waves can penetrate the large clouds of interstellar cosmic dust that are opaque
Waveguide (1,687 words) [view diff] no match in snippet view article find links to article
meaning is a hollow conductive metal pipe used to carry high frequency radio waves, particularly microwaves. The geometry of a waveguide reflects its function
General Electric Building (357 words) [view diff] no match in snippet view article find links to article
burst of Gothic tracery, which is supposed to represent electricity and radio waves, and is lit from within at night. General Electric Building
Nançay radio telescope (520 words) [view diff] no match in snippet view article find links to article
consists of ten panels, each 20 m long and 40 m (131 ft) high; it reflects radio waves towards the fixed secondary mirror 460 m to the south. The secondary
Radio propagation model (769 words) [view diff] no match in snippet view article find links to article
under similar constraints. Created with the goal of formalizing the way radio waves are propagated from one place to another, such models typically predict
Earth–Moon–Earth communication (1,864 words) [view diff] no match in snippet view article find links to article
a radio communications technique which relies on the propagation of radio waves from an Earth-based transmitter directed via reflection from the surface
T Tauri (646 words) [view diff] no match in snippet view article find links to article
wavelengths; the other two shine in the infrared and one of them also emits radio waves. Through VLA radio observations, it was found that the young star (the
Attenuation (2,127 words) [view diff] no match in snippet view article find links to article
waves and signals in electrical circuits, in optical fibers, and in air (radio waves). Electrical attenuators and optical attenuators are common manufactured
Non-contact force (352 words) [view diff] no match in snippet view article find links to article
electromagnetic fields. Examples of this force include: electricity, magnetism, radio waves, microwaves, infrared, visible light, X-rays and gamma rays. Electromagnetism
Beverage antenna (1,711 words) [view diff] no match in snippet view article find links to article
direction as the radio waves. The lack of resonance gives it a wider bandwidth than resonant antennas. It receives vertically polarized radio waves, but unlike