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 ?
8220;Acting based on only RF spectrum information, it is now possible to swiftly discover presence of OFDM signals,” said Sinisa Peric, QRC's Chief Research and Development Engineer, and principal author of this patent.
Trends driving factors for in-the-field RF spectrum management
It provides a high value/low price real-time RF spectrum analyzer with RF recorder capability," said Bruce Devine, CEO, Test Equipment Plus.
Coordination between nongovernment and government users of the RF spectrum is accomplished by joint meetings of the FCC and the NTIA.
Spectrum Manager offers a unique application designed to intelligently monitor the RF spectrum at the physical layer and immediately alert IT managers to interference.
Future military and commercial radio frequency systems will demand better utilization of the RF spectrum, moving towards higher frequency, greater bandwidth, and greater flexibility to accommodate diverse modalities, such as voice, data, video, detection and ranging, and electronic countermeasures," said Mukhanov.
0 software (now included with the OSCOR 5000E) provides additional trace analysis capabilities and the ability to save additional location-specific RF spectrum data.
The BB60C has a frequency range of 9 kHz to 6 GHz, an instantaneous bandwidth (IBW) of 27 MHz, and the ability to sweep the RF spectrum at 24 GHz per second.
Users can enter any frequency sweep within the analyzer's range and view the RF spectrum to locate an open RF space for channel selections, interference avoidance, or interference troubleshooting in real time on-site.
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.
New features include active containment of rogue devices, advanced RF spectrum analysis, and enhanced reporting that meets government and Department of Defense deployment requirements for wireless LANs.
The Space Data Association Limited (SDA) is a non-profit international association of satellite operators that supports the controlled, reliable and efficient sharing of data critical to the safety and integrity of the space environment and the RF spectrum.