A band is a small section of the spectrum of radio communication frequencies, in which channels are usually used or set aside for the same purpose. The electromagnetic (EM spectrum is the range of all possible Electromagnetic radiation frequencies Radio is the transmission of signals by Modulation of electromagnetic waves with frequencies below those of visible Light. Frequency is a measure of the number of occurrences of a repeating event per unit Time. Channel, in communications (sometimes called communications channel) refers to the medium used to convey Information from a Examples include:

• AM broadcast band (530–1610 kHz or to 1710 kHz on the extended AM band in the Americas)
• Various Shortwave bands (5. Medium Wave (MW is a part of the Medium frequency (MF radio band used mainly for AM broadcasting. The hertz (symbol Hz) is a measure of Frequency, informally defined as the number of events occurring per Second. The hertz (symbol Hz) is a measure of Frequency, informally defined as the number of events occurring per Second. The extended MW broadcast band (sometimes known as the X-band is a Medium wave broadcast allocation (1629 kHz –1715 kHz The Americas are the lands of the Western hemisphere or New World, consisting of the Continents of North America and South America Shortwave Radio operates between the frequencies of 3000 KHz (3 Shortwave bands are frequency allocations for use within the High frequency radio spectrum 9–26. 1 MHz)
• Citizens' band (26. Citizens' Band radio ( CB) is in many countries a system of short-distance simplex radio communications between individuals on a selection of 40 channels within 965–27. 405 MHz)
• Television stations 2–6 (54–88 MHz in the Americas)
• FM broadcast band (88–108 MHz, except 76–90 MHz in Japan)
• Airband (108–137 MHz) for air traffic control
• Television stations 7–13 (174–216 MHz in the Americas)
• L band (1,452–1,492 MHz) for digital radio (DAB) outside the United States
• Amateur radio bands among several different frequencies
• Military bands:
  • FM band (35-87. A television station is a type of broadcast station that broadcasts both audio and Video to Television receivers in a particular area In most of the world the FM broadcast band, used for Broadcasting FM Radio stations goes from 87 For a topic outline on this subject see List of basic Japan topics. The airband or air band is the band of frequencies used for radio communication in Aviation. Air traffic control ( ATC) is a service provided by ground-based controllers who direct Aircraft on the ground and in the air NATO L band The NATO L band is defined as the frequency band between 40 and 60  G[[Hertz Hz]] (5–7 Digital radio describes Radio technologies which carry Information as a Digital signal, by means of a Digital modulation method Digital Audio Broadcasting ( DAB) also known as Eureka 147, is a Digital radio technology for Broadcasting Radio stations used in The United States of America —commonly referred to as the Amateur radio, often called ham radio, is both a Hobby and a service in which participants called "hams" use various types of Radio communications A military is an Organization authorized by its Nation to use force usually including use of Weapons in defending its Country (or by attacking In most of the world the FM broadcast band, used for Broadcasting FM Radio stations goes from 87 9 MHz)
  • X band (8–10 GHz)
  • S band (1750–2400 MHz)
• K band (20–40 GHz), which is further subdivided:
  • K_a band: K-above band, 27–40 GHz, mainly used for radar and general communications
  • K_u band: K-under band, 12–18 GHz, mainly used for satellite communications
• Radionavigation beacons, such as LORAN and GPS
• V band (50–75 GHz)
• Various amateur radio bands

Each of these bands has a basic bandplan which dictates how it is to be used and shared, to avoid interference and to set protocol for the compatibility of transmitters and receivers. The X band is part of the Microwave region of the Electromagnetic spectrum. The S band ranges from 2 to 4  GHz, crossing the (artificial boundary between UHF and SHF at 3 NATO K band The NATO K band is defined as a frequency band between 20 and 40 GHz (7 The Ka band (Pronounced "Kay-A Band" covers the frequencies of 26 Radar is a system that uses electromagnetic waves to identify the range altitude direction or speed of both moving and fixed objects such as Aircraft, ships The Ku band ( pronounced "kay-yoo") is a portion of the Electromagnetic spectrum in the Microwave range of frequencies Radio navigation or radionavigation is the application of Radio frequencies to determining a position on the Earth. Beacons are aids to Navigation devices Intentionally conspicuous beacons help guide navigators to their destinations LORAN ( LO ng R ange A id to N avigation is a terrestrial Radio navigation system using Low frequency Radio transmitters Basic concept of GPS operation A GPS receiver calculates its position by carefully timing the signals sent by the constellation of GPS Satellites high above the Earth The V band (vee-band of the Electromagnetic spectrum ranges from 40 to 75 GHz A bandplan or band plan is a Plan for utilizing a particular band of Radio frequencies, that are a portion of the Electromagnetic spectrum In physics interference is the addition ( superposition) of two or more Waves that result in a new wave pattern In the field of Telecommunications, a communications protocol is the set of standard rules for data representation signaling authentication and error detection required to For biologic transmitters see Transmitter substance. A transmitter is an electronic device which usually with the aid of an antenna This article is about a radio receiver for other uses see Radio (disambiguation.

Note that as a matter of physics, bands are divided at wavelengths of 10ⁿ metres, or frequencies of 3×10ⁿ hertz. Physics (Greek Physis - φύσις in everyday terms is the Science of Matter and its motion. In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International The hertz (symbol Hz) is a measure of Frequency, informally defined as the number of events occurring per Second. For example, 30 MHz or 10 m divides shortwave (lower and longer) from VHF (shorter and higher). These are the parts of the radio spectrum, and not its frequency allocation. Radio frequency ( RF) is a Frequency or rate of Oscillation within the range of about 3 Hz to 300 GHz The Electromagnetic spectrum is an aspect of the physical world which like land water and air is subject to usage limitations