radio frequency

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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 ?
The challenge is that there's going to be less … RF spectrum available, and we have tried to address this by creating technology solutions with high density mode.
Coordination between nongovernment and government users of the RF spectrum is accomplished by joint meetings of the FCC and the NTIA.
The MDO4000 allows you to see the RF spectrum of a signal at any point within a long acquisition.
com)-- QRC Technologies has been awarded US patent numbers 8,976,906 and 8,982,971 for using RF Spectrum information to detect the presence of OFDMA signals.
Mark Rawlins, Eutelsat's Director of Communication System Operations, has been elected as the new Chairman of the Space Data Association (SDA), an international non-profit association of satellite operators that supports the controlled, reliable and efficient sharing of space environment and RF spectrum data.
Force level for carriers and multipurpose amphibious assault ships and group level for cruisers and guided missile destroyers accessed the Defense Satellite Communications System with the AN/WSC-6 SATCOM terminal to a DSCS III Service Life Extension Program (SLEP) satellite that operated strictly in the X-band portion of the RF spectrum, for at most a T1 (1.
The DPX Live RF spectrum display quickly catches very short duration transients.
The service consists of a site evaluation, RF spectrum analysis, cell phone detection and threat modelling, scenario planning and development of a migration strategy for correctional facilities, schools or other high risk environments that need protection against threats caused by cell phones.
DPX transforms volumes of real-time data and produces a live RF spectrum display that reveals previously unseen RF signals and signal anomalies.
The Wi-Jack can also simultaneously function as an air monitor, giving IT staff a view into and control over the RF spectrum.
The model ESA-E RF spectrum analyzer features a timesaving Bluetooth measurement function that automatically ezecutes Bluetooth transmitter tests.
Utilizing AVX's patented MLO[TM] technology, which matches the CTE of PCB material and provides low loss across a wide RF spectrum, the new X2A Series RF-DC Crossovers and X2B Series RF-RF Crossovers provide low cost and very low profile solutions for applications in which a critical RF circuit trace intersects a DC or an RF circuit.