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Encyclopedia > Radio frequency
Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including radio waves.
Rough plot of Earth's atmospheric transmittance (or opacity) to various wavelengths of electromagnetic radiation, including radio waves.

Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current which is fed to an antenna. Such frequencies and the belonging wavelength account for the following parts of the frequency spectrum shown in the table below. Wikipedia does not have an article with this exact name. ... It has been suggested that this article or section be merged with radio frequency. ... Image File history File links Download high resolution version (1650x1049, 189 KB)Plot of the transmittance/opacity of the atmosphere to electromagnetic radiation. ... Image File history File links Download high resolution version (1650x1049, 189 KB)Plot of the transmittance/opacity of the atmosphere to electromagnetic radiation. ... FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. ... Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultra high frequency VHF = Very high frequency HF = High... City lights viewed in a motion blurred exposure. ... A yagi antenna Most simply, an antenna is an electronic component designed to send or receive radio waves. ... The wavelength is the distance between repeating units of a wave pattern. ... Familiar concepts associated with a frequency are colors, musical notes, radio/TV channels, and even the regular rotation of the earth. ...

Contents

Radio frequency spectrum

Band name Abbr ITU band Frequency
Wavelength
Example uses
< 3 Hz
> 100,000 km
Extremely low frequency ELF 1 3–30 Hz
100,000 km – 10,000 km
Communication with submarines
Super low frequency SLF 2 30–300 Hz
10,000 km – 1000 km
Communication with submarines
Ultra low frequency ULF 3 300–3000 Hz
1000 km – 100 km
Communication within mines
Very low frequency VLF 4 3–30 kHz
100 km – 10 km
Submarine communication, avalanche beacons, wireless heart rate monitors, geophysics
Low frequency LF 5 30–300 kHz
10 km – 1 km
Navigation, time signals, AM longwave broadcasting
Medium frequency MF 6 300–3000 kHz
1 km – 100 m
AM (Medium-wave) broadcasts
High frequency HF 7 3–30 MHz
100 m – 10 m
Shortwave broadcasts, amateur radio and over-the-horizon aviation communications
Very high frequency VHF 8 30–300 MHz
10 m – 1 m
FM, television broadcasts and line-of-sight ground-to-aircraft and aircraft-to-aircraft communications
Ultra high frequency UHF 9 300–3000 MHz
1 m – 100 mm
television broadcasts, microwave ovens, mobile phones, wireless LAN, Bluetooth, and Two-Way Radios such as FRS and GMRS Radios
Super high frequency SHF 10 3–30 GHz
100 mm – 10 mm
microwave devices, wireless LAN, most modern Radars
Extremely high frequency EHF 11 30–300 GHz
10 mm – 1 mm
Radio astronomy, high-speed microwave radio relay
Above 300 GHz
< 1 mm

Notes This article or section does not adequately cite its references or sources. ... The International Telecommunication Union (ITU; French: Union internationale des télécommunications, Spanish: Unión Internacional de Telecomunicaciones) is an international organization established to standardize and regulate international radio and telecommunications. ... The hertz (symbol: Hz) is the SI unit of frequency. ... A kilometer (Commonwealth spelling: kilometre), symbol: km is a unit of length in the metric system equal to 1,000 metres (from the Greek words χίλια (khilia) = thousand and μέτρο (metro) = count/measure). ... Extremely low frequency (ELF) is the band of radio frequencies from 3 to 30 Hz. ... The hertz (symbol: Hz) is the SI unit of frequency. ... Because electromagnetic radiation such as normal radio communication cannot travel through thick conductors such as salt water, communication with submarines when they are submerged is a difficult technological task which requires specific techniques and devices. ... Super Low Frequency (SLF) is the frequency range between 30 hertz and 300 hertz. ... The hertz (symbol: Hz) is the SI unit of frequency. ... Because electromagnetic radiation such as normal radio communication cannot travel through thick conductors such as salt water, communication with submarines when they are submerged is a difficult technological task which requires specific techniques and devices. ... Ultra Low Frequency (ULF) is the frequency range between 300 hertz and 3000 hertz. ... The hertz (symbol: Hz) is the SI unit of frequency. ... 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). ... An avalanche is a very large slide of snow (or rock) down a mountainside, caused when a buildup of snow is released down a slope, and is one of the major dangers faced in the mountains. ... Photo of a heart rate monitor (made by Polar) showing chest strap and watch Photo of a Prevention MF-180 strapless heart rate monitor This article refers to a device used by laypersons. ... ‹ The template below has been proposed for deletion. ... Low Frequency or LF refers to Radio Frequencies (RF) in the range of 30–300 kHz. ... A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ... Radio navigation is the application of radio frequencies to determining a position on the earth. ... A radio clock A radio clock is a clock that is synchronized by a time code bit stream transmitted by a radio transmitter connected to a time standard such as an atomic clock. ... Longwave can also refer to the economics concept of Kondratiev waves, or to the rock band Longwave The Longwave radio broadcasting band is the range of frequencies between 148. ... Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ... A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ... Look up M, m in Wiktionary, the free dictionary. ... 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. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... Shortwave radio redirects here. ... Ham radio station with modern solid-state transceiver featuring LCD display and DSP capabilities Ham radio station with vintage vacuum tube gear featuring separate transmitter, receiver and power supply Amateur radio, often called Ham radio, is a hobby and public service enjoyed by about 6 million people throughout the world. ... Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... FM radio is a broadcast technology invented by Edwin Howard Armstrong that uses frequency modulation to provide high-fidelity sound over broadcast radio. ... This article is about the radio frequency. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ... Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ... It has been suggested that wireless network interface cards be merged into this article or section. ... Bluetooth logo Bluetooth is an industrial specification for wireless personal area networks (PANs). ... 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. ... Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ... It has been suggested that wireless network interface cards be merged into this article or section. ... This long range Radar antenna, known as ALTAIR, is used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on the Kwajalein atoll[1]. Radar is a system that uses radio waves to determine and map the location, direction, and/or speed... Extremely high frequency is the highest radio frequency band. ... A gigahertz is a billion hertz or a thousand megahertz, a measure of frequency. ... Microwave image of 3C353 galaxy at 8. ... This article or section does not cite its references or sources. ... A gigahertz is a billion hertz or a thousand megahertz, a measure of frequency. ...

  • 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 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.
  • The SHF and EHF bands are often considered to be not part of the radio spectrum and form their own microwave spectrum.
  • Another note of merit is that all objects have their own radio frequency, no matter how minute.

Electromagnetic radiation can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. ... Image of two girls in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ... 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. ... 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. ... Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ...

Named frequency bands

General

Broadcast Frequencies:

  • Longwave AM Radio = 0hz(LF)
  • Mediumwave AM Radio = 530kHz - 1710kHz (MF)
  • TV Band I (Channels 2 - 6) = 54MHz - 88MHz (VHF)
  • FM Radio Band II = 88MHz - 108MHz (VHF)
  • TV Band III (Channels 7 - 13) = 174MHz - 216MHz (VHF)
  • TV Bands == IV == & V (Channels 14 - 69) = 470MHz - 806MHz (UHF) [1]

For more information see the NTIA frequency allocation chart: http://www.ntia.doc.gov/osmhome/allochrt.html


Amateur radio frequencies

The range of allowed frequencies vary between countries. These are just some of the more common bands, often collectively termed shortwave. In the article about amateur radio is another list. Shortwave radio redirects here. ... Ham radio station with modern solid-state transceiver featuring LCD display and DSP capabilities Ham radio station with vintage vacuum tube gear featuring separate transmitter, receiver and power supply Amateur radio, often called Ham radio, is a hobby and public service enjoyed by about 6 million people throughout the world. ...

Band Frequency range
160 m 1.8 to 2.0 MHz
80 m 3.5 to 4.0 MHz
60 m 5.3 to 5.4 MHz
40 m 7 to 7.3 MHz
30 m 10.1 to 10.15 MHz
20 m 14 to 14.35 MHz
15 m 21 to 21.45 MHz
12 m 24.89 to 24.99 MHz
10 m 28.0 to 29.7 MHz
6 m 50 to 54 MHz
2 m 144 to 148 MHz
70 cm 430 to 440 MHz
23 cm 1240 to 1300 MHz

IEEE US

Band Frequency range Origin of name
HF band 3 to 30 MHz High Frequency
VHF band 30 to 300 MHz Very High Frequency
UHF band 300 to 1000 MHz Ultra High Frequency

Frequencies from 216 to 450 MHz were sometimes called P-band: Previous, since early British Radar used this band but later switched to higher frequencies. This long range Radar antenna, known as ALTAIR, is used to detect and track space objects in conjunction with ABM testing at the Ronald Reagan Test Site on the Kwajalein atoll[1]. Radar is a system that uses radio waves to determine and map the location, direction, and/or speed...

L band 1 to 2 GHz Long wave
S band 2 to 4 GHz Short wave
C band 4 to 8 GHz Compromise between S and X
X band 8 to 12 GHz Used in WW II for fire control, X for cross (as in crosshair)
Ku band 12 to 18 GHz Kurz-under
K band 18 to 26 GHz German Kurz (short)
Ka band 26 to 40 GHz Kurz-above
V band 40 to 75 GHz
W band 75 to 111 GHz W follows V in the alphabet

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 ranges from 2. ... 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. ... Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki Tōjō Casualties Military dead: 17,000,000 Civilian dead: 33,000... A fire-control system is a computer, often mechanical, which is designed to assist a weapon system in hitting its target. ... A drawing of different reticles used in telescopic sights. ... 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 (vee-band) of the electromagnetic spectrum ranges from 50 to 75 GHz. ... The W band of the microwave part of the electromagnetic spectrum and ranges from 75 to 111 GHz. ... A Specimen of typeset fonts and languages, by William Caslon, letter founder; from the 1728 Cyclopaedia. ...

EU, NATO, US ECM Frequency Designations

Band Frequency range
A band 0 to 0.25 GHz
B band 0.25 to 0.5 GHz
C band 0.5 to 1.0 GHz
D band 1 to 2 GHz
E band 2 to 3 GHz
F band 3 to 4 GHz
G band 4 to 6 GHz
H band 6 to 8 GHz
I band 8 to 10 GHz
J band 10 to 20 GHz
K band 20 to 40 GHz
L band 40 to 60 GHz
M band 60 to 100 GHz

A Band were a British musical collective formed in Nottingham in the late 1980s. ... The B band is the range of radio frequencies from 250 MHz to 500 MHz in the electromagnetic spectrum. ... C band (compromise band) is a portion of electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 6 GHz. ... The D band is the range of radio frequencies from 1 GHz to 2 GHz in the electromagnetic spectrum. ... The E band is the range of radio frequencies from 2 GHz to 3 GHz in the electromagnetic spectrum. ... The F band is the range of radio frequencies from 3 GHz to 4 GHz in the electromagnetic spectrum. ... The G band in the modern (NATO/EU) sense is the range of radio frequencies from 4 GHz to 6 GHz in the electromagnetic spectrum. ... The H band is the range of radio frequencies from 6 GHz to 8 GHz in the electromagnetic spectrum. ... The I band is the range of radio frequencies from 8 GHz to 10 GHz in the electromagnetic spectrum. ... The J band is the range of radio frequencies from 10 GHz to 20 GHz in the electromagnetic spectrum. ... K band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging between 12 to 63 GHz. ... L band (20-cm radar long-band) is a portion of the microwave band of the electromagnetic spectrum ranging roughly from 0. ... The M band is the range of radio frequencies from 60 GHz to 100 GHz in the electromagnetic spectrum. ...

References

  • ANSI/IEEE Standard: Letter designations for radar-frequency bands.
  • AFR 55-44/AR 105-86/OPNAVINST 3430.9A/MCO 3430.1, 27 October 1964 superseded by AFR 55-44/AR 105-86/OPNAVINST 3430.1A/MCO 3430.1A, 6 December 1978: Performing Electronic Countermeasures in the United States and Canada, Attachment 1,ECM Frequency Authorizations.

The International Telecommunication Union (ITU; French: Union internationale des télécommunications, Spanish: Unión Internacional de Telecomunicaciones) is an international organization established to standardize and regulate international radio and telecommunications. ...

See also

Radio spectrum
ELF SLF ULF VLF LF MF HF 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
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. ... The electromagnetic spectrum is an aspect of the physical world, like land, water, and air. ... Microwave image of 3C353 galaxy at 8. ... 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 30 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. ... Low Frequency or LF 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. ... High frequency (HF) radio frequencies are between 3 and 30 MHz. ... 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. ...



v  d  e
The Electromagnetic Spectrum
(Sorted by wavelength, short to long)
Gamma rayX-rayUltravioletVisible spectrumInfraredTerahertz radiationMicrowaveRadio waves
Visible (optical) spectrum: VioletBlueGreenYellowOrangeRed
Microwave spectrum: W bandV bandK band: Ka band, Ku bandX bandC bandS bandL band
Radio spectrum: EHFSHFUHFVHF • HF • MFLFVLFULFSLFELF
Wavelength designations: MicrowaveShortwaveMediumwaveLongwave

Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultra high frequency VHF = Very high frequency HF = High... This article is about electromagnetic radiation. ... 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... UV redirects here. ... The visible spectrum (or sometimes optical spectrum) is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. ... Image of two girls in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ... Radio waves sent at terahertz frequencies, known as terahertz radiation, terahertz waves, T-rays, T-light, T-lux and THz, are in the region of the light spectrum between 300 gigahertz (3x1011 Hz) and 3 terahertz (3x1012 Hz), corresponding to the wavelength range starting at submillimeter (<1 millimeter) and 100... Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ... The visible spectrum (or sometimes optical spectrum) is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. ... Violet (named after the flower violet) is used in two senses: first, referring to the color of light at the short-wavelength end of the visible spectrum, approximately 380–420 nanometres (this is a spectral color). ... The term blue may refer any of a number of similar colours. ... Mossy, green fountain in Wattens, Austria. ... Rubber duckies. ... The colour orange occurs between red and yellow in the visible spectrum at a wavelength of about 585–620 nm. ... Red may be any of a number of similar colours at the lowest frequencies of light discernible by the human eye. ... Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ... The W band of the microwave part of the electromagnetic spectrum and ranges from 75 to 111 GHz. ... The V band (vee-band) of the electromagnetic spectrum ranges from 50 to 75 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 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. ... The X band (3-cm radar spot-band) of the microwave band of the electromagnetic spectrum roughly ranges from 5. ... C band (compromise band) is a portion of electromagnetic spectrum in the microwave range of frequencies ranging from 4 to 6 GHz. ... The S band ranges from 2. ... L band (20-cm radar long-band) is a portion of the microwave band of the electromagnetic spectrum ranging roughly from 0. ... 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 high frequency is the highest radio frequency band. ... Microwave Slang for small waves, like at a beach, often used by surfers. ... This article is about the radio frequency. ... Very high frequency (VHF) is the radio frequency range from 30 MHz (wavelength 10 m) to 300 MHz (wavelength 1 m). ... High frequency (HF) radio frequencies are between 3 and 30 MHz. ... Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ... Low Frequency or LF refers to Radio Frequencies (RF) in the range of 30–300 kHz. ... Very low frequency or VLF refers to radio frequencies (RF) in the range of 3 to 30 kHz. ... Ultra Low Frequency (ULF) is the frequency range between 300 hertz and 3000 hertz. ... Super Low Frequency (SLF) is the frequency range between 30 hertz and 300 hertz. ... Extremely low frequency (ELF) is the band of radio frequencies from 3 to 30 Hz. ... The wavelength is the distance between repeating units of a wave pattern. ... Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ... Shortwave radio redirects here. ... Mediumwave radio transmissions serves as the most common band for broadcasting. ... Longwave can also refer to the economics concept of Kondratiev waves, or to the rock band Longwave The Longwave radio broadcasting band is the range of frequencies between 148. ...

External links


  Results from FactBites:
 
Radio - Wikipedia, the free encyclopedia (4650 words)
Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum.
Although the word 'radio' is used to describe this phenomenon, the transmissions which we know as television, radio, radar, and cell phone are all classed as radio frequency emissions.
Radio remote control: Use of radio waves to transmit control data to a remote object as in some early forms of guided missile, some early TV remotes and a range of model boats, cars and aeroplanes.
Radio frequency - Wikipedia, the free encyclopedia (356 words)
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 SHF and EHF bands are often considered to be not part of the radio spectrum and form their own microwave spectrum.
Radio and light waves conversion: frequency to wavelength and vice versa
  More results at FactBites »

 
 

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