radio frequency

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Related to radio-frequency spectrum: electromagnetic spectrum

frequency

 [fre´kwen-se]
1. the number of occurrences of a periodic or recurrent process in a unit of time, such as the number of electrical cycles per second measured in hertz. In cardiac pacing terminology, frequency is expressed by the formula: frequency = ½ × pulse width.
2. the number of occurrences of a particular event or the number of members of a population or statistical sample falling in a particular class.
radio frequency the range of frequencies of electromagnetic radiation between 10 kilohertz and 100 gigahertz, used for radio communication.
relative frequency the ratio of the number of occurrences of a specified phenomenon in a population to the total size of the population.
urinary frequency urination at short intervals without increase in daily volume of urinary output, due to reduced bladder capacity or cystitis.

radio frequency

An MRI term for an electromagnetic wave with a frequency in the same range as that used for transmitting radio and television signals. The RF pulses used in MRI are usually in the 1–100 megahertz range, which cause heating of a structure or tissue due to RF pulse absorption.
References in periodicals archive ?
Deputy Chairman of the Ministry of Communications Oleg Ivanov spoke about the state and prospects of using the radio-frequency spectrum in the Russian Federation.
During the upcoming WRC-07, there are a number of agenda items directly affecting Navy and Marine Corps radio-frequency spectrum use.
The agreement assists Defence and the Government to preserve Australias right to continue to operate in the radio-frequency spectrum from space until such a time as Government elects an alternative course of action, she said.
During the inspections, the technicians saw that the amplifiers connected in these streets are not adequately protected, and this means that the equipment becomes a radiating element, generating noise and interference within the national radio-frequency spectrum.
Also, an important proposal made was to amend the Finance Act 1994 so as to declare assignment by the Government of the right to use the radio-frequency spectrum and its subsequent transfers a service.
Held every three to four years, the WRC reviews, and, if necessary, revises the Radio Regulations, the international treaty governing the use of the radio-frequency spectrum and the geostationary-satellite and non-geostationary-satellite orbits.
The WRC is held every three to four years to review and, if necessary, revise the Radio Regulations, the international treaty governing the use of radio-frequency spectrum.
Open Competition: Services In Distribution Of Television Broadcasting Regional State Budgetary Institution Public TV Of Primorye In The Primorsky Territory Via Satellite, With The Provision Of A Dedicated Radio-Frequency Spectrum
Radio-frequency spectrum needed for the operation of short-range high-resolution automotive radar has been allocated in the 79 GHz frequency band.

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