Very high frequencyVery high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF).
Satellite phoneA satellite phone (also called a satellite telephone or satphone) is a type of mobile phone that connects to the public switched telephone network through orbiting satellites instead of terrestrial cell sites. While cellular telephone service companies rely on cell towers, satellite service functions even in areas without terrestrial network coverage but require line-of-sight to a satellite. Most support voice, text, and low-bandwidth data services.
Super high frequencyEU / NATO / US ECM ABCDEFGHIJKLMNIEEE HFVHFUHFLSCXKuKKaVWmm Other TV and radioIIIIIIIVVVISuper high frequency (SHF) is the ITU designation for radio frequencies (RF) in the range between 3 and 30 gigahertz (GHz). This band of frequencies is also known as the centimetre band or centimetre wave as the wavelengths range from one to ten centimetres. These frequencies fall within the microwave band, so radio waves with these frequencies are called microwaves.
L bandEU / NATO / US ECM ABCDEFGHIJKLMNIEEE HFVHFUHFLSCXKuKKaVWmm Other TV and radioIIIIIIIVVVIThe L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of frequencies in the radio spectrum from 1 gigahertz (GHz) to 2 GHz. This is at the top end of the ultra high frequency (UHF) band, at the lower end of the microwave range.
BluetoothBluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres (33 ft). It employs UHFradio waves in the ISM bands, from 2.402GHz to 2.48GHz.
Radio frequencyRadio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz. These are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves, so they are used in radio technology, among other uses.
Personal radio serviceA personal radio service is any system that allows individuals to operate radio transmitters and receivers for personal purposes with minimal or no special license or individual authorization. Personal radio services exist around the world and typically use light-weight walkie talkie portable radios. The power output, antenna size, and technical characteristics of the equipment are set by regulations in each country.
MicrowaveMicrowave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed. A more common definition in radio-frequency engineering is the range between 1 and 100 GHz (wavelengths between 30 cm and 3 mm), or between 1 and 3000 GHz (30 cm and 0.1 mm).
Walkie-talkieA walkie-talkie, more formally known as a handheld transceiver or handheld radio, is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, and to Henryk Magnuski and engineering teams at Motorola. First used for infantry, similar designs were created for field artillery and tank units.
Institute of Electrical and Electronics EngineersThe Institute of Electrical and Electronics Engineers (IEEE) is an American 501(c)(3)charitable professional organization for electrical engineering, electronics engineering, and related disciplines. The IEEE has a corporate office in New York City and an operations center in Piscataway, New Jersey. The IEEE was formed in 1963 as an amalgamation of the American Institute of Electrical Engineers and the Institute of Radio Engineers.
HertzThe hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base units is 1/s or s−1, meaning that one hertz is one per second or the reciprocal of one second. It is used only in the case of periodic events.
International Telecommunication UnionSpecialized agency of the United NationsThe International Telecommunication Union (ITU) is a specialized agency of the United Nations responsible for many matters related to information and communication technologies. It was established on 17 May 1865 as the International Telegraph Union, the first formal and permanent international organization. The organization significantly predates the UN, making it the oldest UN agency.*As an Amazon Associate I earn from qualifying purchases.