An electromagnetic wave eminating from a transmitter. What you listen to on an AM of FM receiver though on a different wavelength. Different ranges of frequencies are allocated to hearing impaired, remote controls, cordless phones, cellular phones, wireless microphones, police and fire communication, etc. Often used to describe how a wireless device (one not connected by physical links) transmits and receives a signal. see infrared, UHF, VHF
radio frequency identification
A frequency that is useful for radio usually between 10 kHz and 300,000 MHz.
High frequency electrical energy used in Catheter Ablation.
Refers to the typical range of frequencies used for carrier signals in radio equipment.
A frequency in the range within which radio waves may be transmitted (10 kilocycles/second to 300,000 megacycles/second)
Waves transmitted in the range within which radio waves may be transmitted, from about 3 kilohertz to about 300,000 megahertz.
A generic term referring to the electromagnetic waveforms for transmission with frequencies from 10 kilocycles to 300,000 megacycles.
(1) Any frequency of electromagnetic energy capable of propagation into space. (2) The frequencies that fall between 3 kilohertz and 300 gigahertz used for radio communications.
Non-wired automatic identification devices that use radio waves to transmit data.
The area (or band) of the electromagnetic spectrum where most radio communication takes place, typically from 100 KHz to 100 GHz.
The number of cycles per second of radio waves. Frequencies are usually given in kilohertz (kHz), thousands of cycles per second, or in megahertz (MHz) millions of cycles per second. The international radio distress frequencies are 500 kHz for radiotelegraphy and 2l82 kHz for radiotelephony. In U.S. waters, the VHF-FM frequency l56.80 MHz (channel l6) is for safety and calling only.
Any electromagnetic frequency from a few hertz up to frequencies in the infrared portion of the spectrum, to approximately 300 THz (terahertz).
Is a term reserved for radio signals at a frequency of more than 150 Hz.
One way a home control system can send signals from the main control unit to the different devices it wants to control. Signals are sent via radio-frequency airwaves, which can be sent through walls and floors of a home.
Electro-magnetic waves used in radio communications to carry information.
Any frequency between normally audible sound waves and the infrared light portion of the spectrum, lying between 10,000 and 1,000,000,000 cycles per second (Hz). R.F. heat sealing machines cycle at around 27 MHz.
an electromagnetic wave with a frequency that is in the same general range as that used for the transmission of radio and television signals. Abbreviated RF. The RF pulses used in MR are commonly in the 1-100 megahertz range, and their principle effect upon a body is potential tissue heating caused by absorption of the applied pulses of RF energy.
an electromagnetic wave frequency between audio and infrared
The frequency range between ultrasonic and infrared. AM broadcast frequencies range from 540 to 1,800 kHz, while FM broadcasts from 88 to 108 MHz.
refers to alternating current having characteristics such that, if the current is input to an antenna, an electromagnetic (EM) field is generated suitable for wireless broadcasting and/or communications. These frequencies cover a significant portion of the electromagnetic radiation spectrum, extending from nine kilohertz (9 kHz), the lowest allocated wireless communications frequency (it's within the range of human hearing), to thousands of gigahertz (gigahertz).
An electromagnetic signal above the audio and below the infrared frequencies.
Electromagnetic energy in the approximate frequency range of 3,000 Hz (3 kHz) to 1 billion Hz (l gHz).
A location or band on the radio frequency spectrum, such as 800, 900 or 1800Mhz.
RF for short. That part of the spectrum from approx 50kHz to giga hertz.
Typically a frequency from 20 kHz to 3 GHZ. RF is usually referred to whenever a signal is radiated through the air. Literally, any and all frequencies that can be radiated as an electromagnetic wave.
Radio Frequency (RF) refers to a specific range of frequencies in the electromagnetic spectrum. Signals in this frequency range can be transmitted through the air or through a wire.
The frequency in Hertz (cycles per second) of the carrier frequency being transmitted or received.
An electromagnetic wave capable of being transmitted and received through space
Is defined as extending from 3 kHz to 300 GHz.
A term that refers to alternating current (AC) having characteristics such that, if the current is input to an antenna, an electromagnetic (EM) field is generated suitable for wireless broadcasting and/or communications.
A range of frequencies used for electromagnetic transmission. (e.g. radio and TV)
The frequency range (10 KHz-3000 GHz) in which radio signals are transmitted.
A term used to describe incoming radio signals to a receiver or outgoing signals from a radio transmitter (above 150 Hz). Even though they are not properly radio signals, TV signals are included in this category.
Refers to the use of radio carrier waves to transmit a broadcast signal. (See "Modulation" above.) Red, green, blue (RGB) The basic color signals used to drive a display.
Any frequency within the electromagnetic spectrum associated with radio-wave propagation.
That part of the spectrum from approximately 50kHz to gigahertz.
The group of electromagnetic wavelengths between 500 KHz and 300 GHz. These wavelengths are used to transmit data or voice signals through the air, to avoid dependence on terrestrial wire transmissions.
The international unit for measuring frequency is Hertz (Hz), which is equivalent to the older unit of cycles per second. One Mega-Hertz (MHz) is one million Hertz. One Giga-Hertz (GHz) is one billion Hertz. For reference: the standard US electrical power frequency is 60 Hz, the AM broadcast radio frequency band is 0.55 -1.6 MHz, the FM broadcast radio frequency band is 88-108 MHz, and microwave ovens typically operate at 2.45 GHz.
Radio frequency refers to a signal generated by a radio transmitter and sent out through an antenna. The frequency of the transmission is described in terms of the number of cycles per second or Hertz (Hz). A radio would be tuned to this frequency in order to receive the transmission. A radio signal is sometimes referred to by its initials, "RF".
Low frequencies of electromagnetic radiation used for communications.
The range or frequencies between 10 kilocycles per second to 300,000 megacycles per second in which radio waves can be transmitted. It can also refer to...
Electromagnetic waves at frequencies of 13.56, 27.12 and 40.68 MHz.
Radio-Frequency. Usually considered to be frequencies ranging from 1§Ö TO 3§×.
Used to identify a class of high frequency electrical signals intended to be radiated as waves. It is also used to describe a range of frequencies less than 1GHz.
A form of wireless communications that lets users relay information via electromagnetic energy waves from a terminal to a base station, which is linked in turn to a host computer. The terminals can be place at a fixed station, mounted on a forklift truck, or carried in the worker's hand. The base station contains a transmitter and receiver for communication with the terminals. RF systems use either narrow-band or spread-spectrum transmissions. Narrow-band data transmissions move along a single limited radio frequency, while spread-spectrum transmissions move across several different frequencies. When combined with a bar-code system for identifying inventory items, a radio-frequency system can relay data instantly, thus updating inventory records in so-called "real time."
The frequency range is technically broad, from about 25 kHz to 100 GHz, but the term is normally used to define the low range band of frequencies used for broadcast radio signals (including broadcast television) and extends from about 500 kHz to a few hundred megahertz.
A frequency that is higher than the audio frequency but below the infrared frequencies. See also Electromagnetic Spectrum.
The RF waves emanating from an antenna are generated by the movement of electrical charges in the antenna. Electromagnetic waves can be characterized by a wavelength and a frequency. The wavelength is the distance covered by one complete cycle of the electromagnetic wave, while the frequency is the number of electromagnetic waves passing a given point in one second. The frequency of an RF signal is usually expressed in terms of a unit called the "hertz" (abbreviated Hz). One Hz equals one cycle per second. One megahertz (MHz) equals one million cycles per second.
Range of frequencies occupied by the transmitted or received signal
The range in which radio waves are transmitted from about 10 kilocycles/second to about 300,000 megacycles/second
Electromagnetic energy with frequencies ranging from 3 kHz to 300 GHz.
An alternating current or electromagnetic signal whose frequency is above approximately 70 kHz.
Refers to the portable data collection / printing devices that use radio frequency (RF) to transmit data to the local host system.
The approximately 10 kHz to 100 GHz electromagnetic band of frequencies used for man-made communication.
Radio frequencies are electronic waves used for wireless transmission. These can be used for communication between a mobile telephone and an antenna mast. For more information please click here
Signals with a repetition rate above audible range, but below the frequencies associated with heat and light. Roll - A loss of vertical sync which causes the picture to move up or down on the TV screen.
Radio Frequency. Includes frequencies from a few kilohertz to several hundred gigahertz. Used to transmit information from point to point over the airwaves or down coaxial cable.
A frequency band in the electromagnetic spectrum with frequencies in the millons of cycles per second. [ Chapter 3
Any of the electromagnetic wave frequencies that lie in the range extending from below 3 kilohertz to about 300 Gigahertz.
Frequencies from 100 kHz to 20 GHz.
Radio frequency. Measured in Hertz, MHz and GHz.
The frequencies in the electromagnetic spectrum that are used for radio communications.
Generally, a frequency from approximately 50 kHz to 3 GHz. RF is usually referred to whenever a signal is radiated through the air.
1. (Abbreviated RF.) The number of oscillations per second of the electric and magnetic fields in the radio portion of the electromagnetic spectrum, generally that portion between 104 and 1012 Hz; specifically, the frequency of a given radio carrier wave. 2. In radio or radar, pertaining to a signal at the transmitted or received frequency, as opposed to a signal translated to a different frequency ( IF signal) or detected ( video signal).
Analog electrical signals sent over the cable. Conventional (broadcast) television and radio, as well as cable TV, deliver RF signals to your television/radio. RF is quickly becoming yesterday's news to many cable TV providers who are installing fiber-optic lines that will replace today's cables.
The spectrum of electromagnetic energy between audio and light: 500 KHz to 300 GHz.
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 and the belonging wavelength account for the following parts of the frequency spectrum shown in the table below.