radio frequency

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Related to radio spectrum: radio frequency, electromagnetic spectrum, Radio waves

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 ?
Radio spectrum management system (including the installation and customization needs CRA) - is a unified, flexible, comparable opportunities for broad parameters and database management software for radio spectrum, stations and maintenance allowances.
Defence Minister, Philip Dunne, said: "Ofcom are experienced in managing radio spectrum sales.
It will ensure that full advantage is taken of international market and technology developments by making the requisite radio spectrum available in time.
Two years ago, the Federal Communications Commission reserved a 10-megahertz block of radio spectrum for public-safety use.
Staff monitoring the use of the radio spectrum have located a number of sources who are violating the conditions of their frequency licence including the permitted transmit power.
Fabio Colasanti, a senior official at the EU executive, said the Union aims to use a specific part of radio spectrum known as "L band" as a short term solution for joint frequency, but taking it into use will still take time.
The concept is to receive the solar noise emitted by the sun via the satellite dish and graph the radio spectrum based on relative amplitude, also known as db.
The measure will severely curtail LPFM, preventing as much as 75 percent of new licenses from being approved and "preserving" a public resource, the radio spectrum, for the private use of current frequency holders.
Edwards is feeling the pinch of what is a global problem - a shrinking availability of radio spectrum frequencies that are needed to send and receive information from test aircraft.
Wireless communications carriers need licenses from the FCC in order to operate in the radio spectrum, and its major competitors have twice as much spectrum.
Now, though, the radio environment has grown deafening, by astronomers' standards, and the competition among those who would like a piece of the radio spectrum has become frenzied.
The radio spectrum is a preciously limited and publicly owned commodity.