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Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. Such frequencies account for the following parts of the spectrum: Radio transmission diagram and electromagnetic waves Radio is a technology that allows the transmission of signals by modulation of electromagnetic waves with frequencies below those of light. ...
Sine waves of various frequencies; the lower waves have higher frequencies than those above. ...
The electromagnetic spectrum encompasses all possible wavelengths of electromagnetic radiation. ...
An alternating current (AC) is an electrical current, where the magnitude and direction of the current varies cyclically, as opposed to direct current, where the direction of the current stays constant. ...
A yagi antenna Most simply, an antenna is an electronic component designed to send or receive radio waves. ...
Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including radio waves. Note: above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that the atmosphere is effectively opaque to higher frequencies of electromagnetic radiation, until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges. The International Telecommunication Union (ITU) is an international organization established to standardize and regulate international radio and telecommunications. ...
The hertz (symbol Hz) is the SI unit of frequency. ...
KM, Km, or km may stand for: Khmer language (ISO 639 alpha-2, km) Kilometre/Kilometer (only km in minuscule is the correct representation of kilometer as an SI unit of length) Kinemantra Meditation Knowledge management, in the field of Library and information science Knowledge Machine, the KM knowledge representation...
Extremely low frequency (ELF) is the band of radio frequencies from 3 to 300 Hz. ...
Super Low Frequency (SLF) is the frequency range between 30 Hertz and 300 Hertz. ...
Ultra Low Frequency (ULF) is the frequency range between 300 Hertz and 3000 Hertz. ...
Very low frequency or VLF refers to radio frequencies (RF) in the range of 3 to 30 kHz. ...
A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ...
Low Frequency or LF (sometimes called longwave) refers to Radio Frequencies (RF) in the range of 30-300 kHz. ...
Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ...
M is the thirteenth letter of the Latin alphabet. ...
High frequency (HF) radio frequencies are between 3 and 30 MHz. ...
A megahertz (MHz) is one million (106) hertz, a measure of frequency. ...
Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ...
This article is about the radio frequency. ...
MM or Mm or mm can stand for: Roman numeral for 2,000 and the year 2000 A millimetre (mm) or megameter (Mm) Myanmar Master of Management Maelzels metronome: precedes a beats-per-minute tempo measurement Maximum Medicine My Medicine Modern Medicine Monster Manual - one of the three Core...
Microwave Slang for small waves, like at a beach, often used by surfers. ...
A gigahertz is a billion hertz or a thousand megahertz, a measure of frequency. ...
Extremely high frequency is the highest radio frequency band. ...
Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ...
The ELF, SLF, ULF, and VLF bands overlap the AF (audio frequency) spectrum, which is approximately 20–20,000 Hz. However, sounds are transmitted by atmospheric compression and expansion, and not by electromagnetic energy. An audio frequency (abbreviation: AF) is any frequency from about 20 hertz to about 20 kilohertz, which is the approximate range of sound frequencies that is audible to humans. ...
Electrical connectors designed to work at radio frequencies are known as RF connectors. RF is also the name of a standard audio/video connector, also called BNC (Bayonet Neill-Concelman). A radio frequency connector is an electrical connector designed to work at radio frequencies. ...
An electrical connector is a device for joining electrical circuits together. ...
BNC can refer to one of the following: A BNC connector, a type of cable jack. ...
Named frequency bands
- Band III - 174–245 MHz
- ISM band......specific frequencies vary
The industrial, scientific, and medical (ISM) radio bands were originally reserved internationally for non-commercial use of RF electromagnetic fields for industrial, scientific and medical purposes. ...
Microwave (IEEE US) L band (20-cm radar long-band) is a portion of the microwave band of the electromagnetic spectrum ranging roughly from 0. ...
The S band, or 10-cm radar short-band, is the part of the microwave band of the electromagnetic spectrum ranging roughly from 1. ...
C band (compromise band) is a portion of electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 6 GHz. ...
The X band (3-cm radar spot-band) of the microwave band of the electromagnetic spectrum roughly ranges from 5. ...
The Ku band (kay-yoo kurz-under band) is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 11 to 18 GHz. ...
K band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging between 12 to 63 GHz. ...
The Ka band (kurz-above band) is a portion of the K band of the microwave band of the electromagnetic spectrum. ...
The V band of the electromagnetic spectrum ranges from 50 to 75 GHz. ...
See also | Radio spectrum
ELF | SLF | ULF/VF | VLF | LF/LW | MF/MW | HF/SW | VHF | UHF | SHF | EHF
3 Hz | 30 Hz | 300 Hz | 3 kHz | 30 kHz | 300 kHz | 3 MHz | 30 MHz | 300 MHz | 3 GHz | 30 GHz | 300 GHz Radio propagation is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. ...
Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna. ...
Extremely low frequency (ELF) is the band of radio frequencies from 3 to 300 Hz. ...
Super Low Frequency (SLF) is the frequency range between 30 Hertz and 300 Hertz. ...
Ultra Low Frequency (ULF) is the frequency range between 300 Hertz and 3000 Hertz. ...
A voice frequency (VF) or voice band is one of the frequencies, within part of the audio range, that is used for the transmission of speech. ...
Very low frequency or VLF refers to radio frequencies (RF) in the range of 3 to 30 kHz. ...
Low Frequency or LF (sometimes called longwave) refers to Radio Frequencies (RF) in the range of 30-300 kHz. ...
Longwave radio frequencies are those below 500 kHz, which correspond to wavelengths longer than 600 meters. ...
Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ...
Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ...
High frequency (HF) radio frequencies are between 3 and 30 MHz. ...
Shortwave radio operates between the frequencies of 3,000 kHz and 30 MHz (30,000 kHz) and came to be referred to as such in the early days of radio because the wavelengths associated with this frequency range were shorter than those commonly in use at that time. ...
Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ...
This article is about the radio frequency. ...
Microwave Slang for small waves, like at a beach, often used by surfers. ...
Extremely high frequency is the highest radio frequency band. ...
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| Electromagnetic Spectrum Radio waves | Microwave | Infrared | Optical spectrum | Ultraviolet | X-ray | Gamma ray
The electromagnetic spectrum encompasses all possible wavelengths of electromagnetic radiation. ...
Microwave Slang for small waves, like at a beach, often used by surfers. ...
Image of a small dog taken in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation. ...
The optical spectrum (light or visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye. ...
Note: Ultraviolet is also the name of a 1998 UK television miniseries about vampires. ...
In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz...
This article is about electromagnetic radiation. ...
Visible: Red | Orange | Yellow | Green | Blue | Indigo | Violet Red re-directs here; for alternate uses see Red (disambiguation) Red is a color at the lowest frequencies of light discernible by the human eye. ...
See also Orange (disambiguation) for other meanings of the word. ...
Yellow is the color of light whose wavelength is between 565nm and 590nm, or is a mixture of red and green light that appears to be the same color. ...
Green is a color seen commonly in nature. ...
Blue (from Old High German blao shining) is one of the three primary additive colors; blue light has the shortest wavelength (about 470 nm) of the three primary colors. ...
This article is about the color. ...
Violet (named after the flower violet) refers to any of a group of reddish blue or bluish purple colors. ...
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