Faster access than browser!
51 relations: Amateur radio, Antenna (radio), Aurora, Automatic link establishment, Automatic repeat request, Broadband over power lines, Citizens band radio, Continuous wave, Critical frequency, Curtain array, Decametre, Dipole antenna, Electromagnetic radiation, Electromagnetic spectrum, Frequency of optimum transmission, Global Maritime Distress and Safety System, Hertz, High Frequency Active Auroral Research Program, High Frequency Internet Protocol, International Telecommunication Union, Internet, Ionization, Ionosphere, Log-periodic antenna, Low frequency, Lowest usable high frequency, Maximum usable frequency, Medium frequency, Morse code, Over-the-horizon radar, Polarization (waves), Quad antenna, Radio control, Radio frequency, Radio propagation, Random wire antenna, Refraction, Rhombic antenna, Satellite, Season, Shortwave radio, Single-sideband modulation, Skywave, Solar cycle, Space weather, Standardization Agreement, Sunspot, Terminator (solar), Very high frequency, Yagi–Uda antenna, ..., 2182 kHz. Expand index (1 more) »
Amateur radio
Amateur radio, also known as ham radio, describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication.
New!!: High frequency and Amateur radio · See more »
Antenna (radio)
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
New!!: High frequency and Antenna (radio) · See more »
Aurora
An aurora (plural: auroras or aurorae), sometimes referred to as polar lights, northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in the high-latitude regions (around the Arctic and Antarctic).
New!!: High frequency and Aurora · See more »
Automatic link establishment
Automatic Link Establishment, commonly known as ALE, is the worldwide de facto standard for digitally initiating and sustaining HF radio communications.
New!!: High frequency and Automatic link establishment · See more »
Automatic repeat request
Automatic repeat request (ARQ), also known as automatic repeat query, is an error-control method for data transmission that uses acknowledgements (messages sent by the receiver indicating that it has correctly received a data frame or packet) and timeouts (specified periods of time allowed to elapse before an acknowledgment is to be received) to achieve reliable data transmission over an unreliable service.
New!!: High frequency and Automatic repeat request · See more »
Broadband over power lines
Broadband over power lines (BPL) is a method of power line communication (PLC) that allows relatively high-speed digital data transmission over the public electric power distribution wiring.
New!!: High frequency and Broadband over power lines · See more »
Citizens band radio
Citizens band radio (also known as CB radio) is, in many countries, a system of short-distance radio communications between individuals typically on a selection of 40 channels within the 27 MHz (11 m) band.
New!!: High frequency and Citizens band radio · See more »
Continuous wave
A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency, almost always a sine wave, that for mathematical analysis is considered to be of infinite duration.
New!!: High frequency and Continuous wave · See more »
Critical frequency
In telecommunication, the term critical frequency has the following meanings.
New!!: High frequency and Critical frequency · See more »
Curtain array
Curtain arrays are a class of large multielement directional wire radio transmitting antennas, used in the shortwave radio bands.
New!!: High frequency and Curtain array · See more »
Decametre
A decametre or dekametre (American spelling: decameter, earlier dekameter; symbol dam,, This measure is included in the SI mostly for completeness: in principle, any combination of prefix and unit can be written, but many are rarely used in practice. One practical use of the decameter is for altitude of geopotential heights in meteorology. Meteorologists also use another seldom encountered SI prefix: hecto- in hectopascal (hPa). The volumetric form (see below) cubic decametre is convenient for describing large volumes of water such as in rivers and lakes. The square decametre (dam2) also known as the are (a), is the basis for the hectare (100 dam2), the standard metric unit of land registry.
New!!: High frequency and Decametre · See more »
Dipole antenna
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna.
New!!: High frequency and Dipole antenna · See more »
Electromagnetic radiation
In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.
New!!: High frequency and Electromagnetic radiation · See more »
Electromagnetic spectrum
The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.
New!!: High frequency and Electromagnetic spectrum · See more »
Frequency of optimum transmission
Frequency of optimum transmission (FOT), in the transmission of radio waves via ionospheric reflection, is the highest effective (i.e. working) frequency that is predicted to be usable for a specified path and time for 90% of the days of the month.
New!!: High frequency and Frequency of optimum transmission · See more »
Global Maritime Distress and Safety System
The Global Maritime Distress and Safety System (GMDSS) is an internationally agreed-upon set of safety procedures, types of equipment, and communication protocols used to increase safety and make it easier to rescue distressed ships, boats and aircraft.
New!!: High frequency and Global Maritime Distress and Safety System · See more »
Hertz
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
New!!: High frequency and Hertz · See more »
High Frequency Active Auroral Research Program
The High Frequency Active Auroral Research Program (HAARP) was initiated as an ionospheric research program jointly funded by the U.S. Air Force, the U.S. Navy, the University of Alaska Fairbanks, and the Defense Advanced Research Projects Agency (DARPA).
New!!: High frequency and High Frequency Active Auroral Research Program · See more »
High Frequency Internet Protocol
High Frequency Internet Protocol (HFIP or HF-IP) is usually associated with Automatic Link Establishment and HF radio data communications.
New!!: High frequency and High Frequency Internet Protocol · See more »
International Telecommunication Union
The International Telecommunication Union (ITU; Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.
New!!: High frequency and International Telecommunication Union · See more »
Internet
The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.
New!!: High frequency and Internet · See more »
Ionization
Ionization or ionisation, is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.
New!!: High frequency and Ionization · See more »
Ionosphere
The ionosphere is the ionized part of Earth's upper atmosphere, from about to altitude, a region that includes the thermosphere and parts of the mesosphere and exosphere.
New!!: High frequency and Ionosphere · See more »
Log-periodic antenna
A log-periodic antenna (LP), also known as a log-periodic array or log-periodic aerial, is a multi-element, directional antenna designed to operate over a wide band of frequencies.
New!!: High frequency and Log-periodic antenna · See more »
Low frequency
Low frequency (low freq) or LF is the ITU designation for radio frequencies (RF) in the range of 30 kilohertz (kHz)–300 kHz.
New!!: High frequency and Low frequency · See more »
Lowest usable high frequency
The lowest usable high frequency (LUF), in radio transmission, is that frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g., 0100 to 0200 UTC, on 90% of the undisturbed days of the month.
New!!: High frequency and Lowest usable high frequency · See more »
Maximum usable frequency
In radio transmission maximum usable frequency (MUF) is the highest radio frequency that can be used for transmission between two points via reflection from the ionosphere (skywave or "skip" propagation) at a specified time, independent of transmitter power.
New!!: High frequency and Maximum usable frequency · See more »
Medium frequency
Medium frequency (MF) is the ITU designation for radio frequencies (RF) in the range of 300 kilohertz (kHz) to 3 megahertz (MHz).
New!!: High frequency and Medium frequency · See more »
Morse code
Morse code is a method of transmitting text information as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment.
New!!: High frequency and Morse code · See more »
Over-the-horizon radar
Over-the-horizon radar, or OTH (sometimes called beyond the horizon, or BTH), is a type of radar system with the ability to detect targets at very long ranges, typically hundreds to thousands of kilometres, beyond the radar horizon, which is the distance limit for ordinary radar.
New!!: High frequency and Over-the-horizon radar · See more »
Polarization (waves)
Polarization (also polarisation) is a property applying to transverse waves that specifies the geometrical orientation of the oscillations.
New!!: High frequency and Polarization (waves) · See more »
Quad antenna
A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands.
New!!: High frequency and Quad antenna · See more »
Radio control
Radio control (often abbreviated to R/C or simply RC) is the use of radio signals to remotely control a device.
New!!: High frequency and Radio control · See more »
Radio frequency
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
New!!: High frequency and Radio frequency · See more »
Radio propagation
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another, or into various parts of the atmosphere.
New!!: High frequency and Radio propagation · See more »
Random wire antenna
A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a relation to the wavelength of the radio waves used, but is typically chosen more for convenience.
New!!: High frequency and Random wire antenna · See more »
Refraction
Refraction is the change in direction of wave propagation due to a change in its transmission medium.
New!!: High frequency and Refraction · See more »
Rhombic antenna
A rhombic antenna is a broadband directional wire antenna co-invented by Edmond BruceUS Patent No.
New!!: High frequency and Rhombic antenna · See more »
Satellite
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
New!!: High frequency and Satellite · See more »
Season
A season is a division of the year marked by changes in weather, ecology, and amount of daylight.
New!!: High frequency and Season · See more »
Shortwave radio
Shortwave radio is radio transmission using shortwave radio frequencies.
New!!: High frequency and Shortwave radio · See more »
Single-sideband modulation
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation, used to transmit information, such as an audio signal, by radio waves.
New!!: High frequency and Single-sideband modulation · See more »
Skywave
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.
New!!: High frequency and Skywave · See more »
Solar cycle
The solar cycle or solar magnetic activity cycle is the nearly periodic 11-year change in the Sun's activity (including changes in the levels of solar radiation and ejection of solar material) and appearance (changes in the number and size of sunspots, flares, and other manifestations).
New!!: High frequency and Solar cycle · See more »
Space weather
Space weather is a branch of space physics and aeronomy concerned with the time varying conditions within the Solar System, including the solar wind, emphasizing the space surrounding the Earth, including conditions in the magnetosphere, ionosphere, thermosphere, and exosphere.
New!!: High frequency and Space weather · See more »
Standardization Agreement
In NATO a STANdardization AGreement (STANAG) defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the alliance.
New!!: High frequency and Standardization Agreement · See more »
Sunspot
Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas.
New!!: High frequency and Sunspot · See more »
Terminator (solar)
A terminator or twilight zone is a moving line that divides the daylit side and the dark night side of a planetary body.
New!!: High frequency and Terminator (solar) · See more »
Very high frequency
Very 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 to one meter.
New!!: High frequency and Very high frequency · See more »
Yagi–Uda antenna
A Yagi–Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods.
New!!: High frequency and Yagi–Uda antenna · See more »
2182 kHz
The radio frequency 2182 kHz is one of the international calling and distress frequencies for maritime radiocommunication in a frequency band allocated to the mobile service on primary basis, exclusively for distress and calling operations.
New!!: High frequency and 2182 kHz · See more »
Redirects here:
HF radio, High Frequency, High-frequency.
References
[1] https://en.wikipedia.org/wiki/High_frequency
