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 ?
Register for ADI's webcast "Solutions for Fitting High Performance RF Signal Chains into Small Spaces" on November 16, 2011, 12:00 pm EDT at www.
Because of the low RF signal attenuation, fiber cables can be cut to standard lengths and connectorized as part of an installation kit.
DEV's Signal Recording allows a user to access the RF signal level of any L-Band signal and/or LNB feeder current directly via the web interface of the DEV 2190.
The threshold level is set by inputting an RF signal of the desired level into the unit and adjusting the external resistor until the output changes from a logic 0 to a logic 1.
A photodetector array in the focal plane of the lens samples the multiple diffracted beams and produces discrete electronic charge packets whose array position and intensity are proportional to the original RF signal frequency and power, respectively.
The ADIsimRF[TM] design tool is the software accompaniment to ADI's complete portfolio of RF-to-digital functional blocks, allowing engineers to model RF signal chains using devices from across ADI's RF IC portfolio.
In drain modulation architectures, an envelope detector modulates the PA power supply from the incoming RF signal, thereby only giving the PA the power needed to properly transmit the RF signal.
The RF signal and Windows Vista certification make Keyspan's remote an ideal option.
The resulting RF signal is captured with an N9020A spectrum analyzer so that designers can characterize transmitter behavior and isolate defects.
The Converged Headend Platform CHP Max[TM] 5000 1GHz GAMP3 is available today and can be used as a key system component in a headend or hub environment to provide RF signal amplification and narrowcast layering.
Luxul's complete line of patented circular polarized antennas, patent-pending POE amplifiers, and integrated solutions provides the most efficient propagation, reliable performance and cleanest RF signal available.
Agilent N9310A RF Signal Generator Provides Superior Quality, Significantly Reduces Cost of Test