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States that [[gene frequency]] remains constant across generations (no [[genetic drift]]) unless a force

The international ([[SI]]) unit of [[frequency]], with units of inverse [[second]]s, commonly called cycles per seocond.

==Operating frequency tradeoffs== Satellites operating in the [[ITU Frequency Bands|Ultra-High Frequency (UHF)]] offer the advantage of simple receivers and antennas, with plausibl

...t frequency'' from the local oscillator, and the known unmodulated carrier frequency. ...ubsequent stages of the receiver are pretuned, such as 455 kHz in a medium-frequency AM broadcast radio.

...r wave of the basic waveform. While the term is most often used with radio frequency carrier waves, it can apply to sound waves as well, such as when a basic st ...dulation:Changing the frequency (i.e., the time between peaks of the basic frequency)

Electromagnetic noise proportional to f^-n, where f = frequency and n={0,1,2).

In a sound, the overall deviation of the frequency ratios from those of an [[overtone]] series.

The asymptotic frequency of a subset of the natural numbers.

...frequency bands|high frequency (HF)]] or [[ITU frequency bands| very high frequency (VHF)]].

a symmetrical bell-shaped probability distribution representing the frequency of random variations of a quantity from its mean.

The range of [[frequency|frequencies]] that can be [[hearing|heard]] by a [[life|living]] [[organism

A physical medium, including a designated [[frequency]] and physical scope, of the [[electromagnetic spectrum]], over which multi

The study of a system or object by means of selected [[frequency band]]s in the [[electromagnetic spectrum]].

...fs/bain/atmi02/tuning/default.html |title=12 Tone Equal Temperament (12TET)Frequency Table based on A4 = 440 Hz |author=Reginald Bain |year=2002 |accessdate=201

...in intensity of a signal when irradiation is carried out at the resonance frequency of a spatially proximal nucleus.

...[[SA-5 GAMMON]] [[surface-to-air missile]], operating in the [[EU-NATO-US frequency bands|H-band]]

{{r|Frequency modulation}} {{r|Frequency synthesizer}}

{{r|Frequency modulation}} {{r|Frequency agility}}

{{r|Frequency modulation|FM}}

...ber of allies, '''AN/[[SSQ-57]]''' [[sonobuoy]]s are passive acoustic, low-frequency listening devices dropped from aircraft and helicopters. In [[antisubmarin ...ibrated low-frequency analysis and recording (LOFAR) sonobuoy. It is a low-frequency version of the earlier AN/SSQ-41 passive sonobuoy, no longer in service. On

...r the U.S. Army. The family operates in the ITU frequency bands|very high frequency (VHF) part of the electromagnetic spectrum, which, while requiring a longer ...e manner, direction finding systems may not be able to follow the changing frequency long enough to get an accurate position.

...hman. Measuring ultrashort laser pulses in the time-frequency domain using frequency-resolved optical gating. Rev. Sci. Instrum. 68, 3277 (1997); DOI:10.1063/1.

The '''hertz''' is the [[SI]] unit of frequency, and has units of inverse [[second]]s. The hertz is used only for periodic ...sting uses frequencies from 87.5 MHz to 107.7 MHz. Visible [[light]] has a frequency of about 400 THz to 750 THz.

For a repeating phenomenon such as a [[radio]] signal with a given [[frequency]], the wavelength is the length, in meters, of a single repetition

An [[interference]] between two [[sound]]s of slightly different [[frequency|frequencies]], perceived as periodic variations in volume whose rate is the

...(IEEE) has defined as standard IEEE Standard 521-1984, a system of '''IEEE frequency bands''' for electromagnetic frequencies used for [[radio]] and [[radar]]. | chapter = Frequency letter bands

...uencies, possibly under the control of pseudo-random, network-synchronized frequency selection software

...rom 4.8 to 512 kbps per channel using the C, Ku, or X IEEE frequency bands|frequency bands, which are far too low for large volume data from such sensors as ima

The constant of proportionality relating the energy of a photon to the frequency of that photon, named sfter Max Karl Ernst Ludwig Planck.

*[[Frequency agility]]; varying one or more transmitted signal frequencies ...spread spectrum can be combined with rapidly changing [[frequency agility|frequency changing within the band]], not putting equal power in all frequencies at a

...asting system, transmitting at 518 kHz in the [[ITU frequency bands|medium frequency band]], for textual [[weather information distribution]]. It is intended to ...ice, for inland waters. Other services include safety information in other frequency bands, as well as radiofacsimile weather information.<ref>{{citation |url=h

<noinclude>{{Subpages}}</noinclude>A form of [[frequency compensation]] used in an [[electronic amplifier]] to increase the stabilit

...rasound to detect movement of blood cells by the analysis of the change in frequency of the returning echoes.

...physicist, who in 1842 discovered the 'Doppler effect', where the observed frequency of a wave depends on the velocity of the source relative to the observer.

...radome of the SPS-64|AN-SPS-64 navigational radar. It operates in the IEEE frequency bands|IEEE L-band/NATO C-band, and is mounted higher than the SPY-1|AN/SPY- ...(ECCM) capabilities including frequency agility, variable pulse repetition frequency and sidelobe cancellation.

...]], and [[television]], the '''carrier wave''', also called the '''carrier frequency''', is the basic information-free [[electromagnetic wave]] onto which infor

...(VHF) while air-to-ground and air-to-air is ITU Frequency Bands|ultra-high frequency (UHF). Communications security devices now may be separate; reduction in th

...ength of electromagnetic radiation or an apparent decrease in the observed frequency.

...ctical [[software-defined radio]] family that operates in the full VHF/UHF frequency range, with an internal encryption unit, and compatibility with [[SINCGARS]

...ia''' is "urination of a large volume of urine with an increase in urinary frequency, commonly seen in [[diabetes]] (diabetes mellitus; [[diabetes insipidus]]).

{{r|Frequency}} {{r|IEEE frequency bands}}

:#Carrier frequency :#Information frequency

Soviet [[EU-NATO-US frequency bands|D or E-band]] nodding height finding radar used with the [[S-75 Dvina

...s potential as a semiconductor for applications requiring high power, high frequency or a large degree of chemical inertness.

...re defined to operate in a variety of geographic regions with a variety of frequency bands.

...es}}</noinclude>A standardization of [[Pitch (music)|pitch]] that sets the frequency of a simple [[Tone (music)|tone]] at pitch ''A''4 (the ''A'' above middle '

...form]] includes the [[software-defined radio]] not only to emulate a given frequency range and modulation, but encryption, medium-sharing technique for multiple

Its main successor is the [[PRC-119|AN/PRC-119]], which added [[SINCGARS]] frequency agility; the PRC-119 will be replaced by new [[software-defined radio]]s, i ...ting in the [[ITU frequency bands|high HF/low VHF frequency band]] using [[frequency modulation]] (FM), it had a maximum range, using full power and its standar

...oscopy]] &mdash; the analysis of absolute and/or relative contributions of frequency components to the spectrum of a given sample or object.

...be radio with preselected frequencies in the 38.0 to 54.9 MHz range, using frequency modulation without any electronic protection. ...save for operating frequencies, which went into the upper end of the High Frequency (HF) band for the -8 and -9.