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telecommunications, frequency drift is an unintended and generally arbitrary offset of an oscillator from its nominal frequency. Causes may include component
Frequency_drift
Concept in genetics
Genetic drift is the change in the frequency of an existing allele in a population due to chance. Genetic drift may cause alleles to disappear completely
Genetic_drift
Measure of frequency stability in clocks and oscillators
or imperfections such as frequency drift or temperature effects. The Allan variance and Allan deviation describe frequency stability. See also the section
Allan_variance
Radio circuit
transmitter frequency, but the most common cause is drift of the center bandpass frequency of the receiver, due to thermal or mechanical drift in the values
Automatic_frequency_control
Electronic method of transmitting information with a carrier wave
simultaneously). Frequency drift or a lack of selectivity may cause one station to be overtaken by another on an adjacent channel. Frequency drift was a problem
Frequency_modulation
Clock type
decreases a given crystal's frequency but it can also increase a given crystal's frequency. Factors that can cause a small frequency drift over time are stress
Quartz_clock
Concept in radio transmission
a frequency modulated signal, and the nominal center or carrier frequency. The term is sometimes mistakenly used as synonymous with frequency drift, which
Frequency_deviation
Topics referred to by the same term
acceleration Incremental changes: Drift (linguistics), a type of language change Genetic drift, change in allele frequency Drift (telecommunication), long-term
Drift
Fiber optic network transmission standard
10-11/day frequency drift 0100 G.812T transit 10-9 /day frequency drift 1000 G.812L local 2*10-8/day frequency drift 1011 G.813 5*10-7/day frequency drift 1111
STM-1
Oscillator whose frequency can be tuned over some range
drift and aging, electronic noise, low Q factor and non-linearity. Modern radio receivers and transmitters usually use some form of digital frequency
Variable-frequency_oscillator
Electronic system for generating any of a range of frequencies
frequency. Automatic frequency control (AFC) solves some of the drift problem, but manual retuning was often necessary. Since transmitter frequencies
Frequency_synthesizer
The drift should be characterized, such as "diurnal frequency drift" and "output level drift." Drift is usually undesirable and unidirectional, but may
Drift_(telecommunications)
Sub-nanosecond accuracy time transfer using Ethernet
phase-locked loop which makes them run at exactly this frequency. This removes the jitter and frequency drift in the clocks that is responsible for the offset
White_Rabbit_Project
Radio waves produced by the Sun
same frequency range. While each individual Type I burst does not drift in frequency, a chain of Type I bursts in a noise storm may slowly drift from
Solar_radio_emission
produces a signal which is much more tolerant of receiver mis-tunings and frequency drift than MFSK modulation. Additionally, IFK modulation is more resistant
Incremental_frequency_keying
Vacuum tube used for amplifying radio waves
the input frequency. To reinforce the bunching, a klystron may contain additional "buncher" cavities. The beam then passes through a "drift" tube, in
Klystron
Clock that monitors the resonant frequency of atoms
Because some active hydrogen masers have a modest but predictable frequency drift with time, they have become an important part of the BIPM's ensemble
Atomic_clock
Electronic oscillator circuit
tuned circuits, which could easily drift off frequency by 3–4 kHz. Since broadcast stations were assigned frequencies only 10 kHz (Americas) or 9 kHz (elsewhere)
Crystal_oscillator
Measurement unit derived from basic metric value
coherent derived units (for example, hertz, the SI unit of measurement of frequency), but the rest merely reflect their derivation: for example, the square
SI_derived_unit
First spacecraft to visit Saturn (1973–1995)
consistently indicated the presence of a small but anomalous Doppler frequency drift. The drift can be interpreted as due to a constant acceleration of (8.74
Pioneer_11
Information method in electromagnetic radiation
advanced laser systems that narrow the frequency drift far below the difference frequency (intermediate frequency). This technique has been demonstrated
Optical_heterodyne_detection
Device for generating microwaves
Hans Hollmann in Berlin. However, the German military considered the frequency drift of Hollman's device to be undesirable, and based their radar systems
Cavity_magnetron
Center of motion of a charged particle
around a point called the guiding center and a relatively slow drift of this point. The drift speeds may differ for various species depending on their charge
Guiding_center
Chemical compound
deuterated solvent, as the field frequency is locked using the deuterium signal of the solvent to prevent frequency drift. Commercial chloroform-d does,
Deuterated_chloroform
Arrangement of mirrors
The heat generated in the gain medium leads to frequency drift of the cavity, therefore the frequency can be actively stabilized by locking it to unpowered
Optical_cavity
Plasma flow
acoustic mode branch, which has finite frequency). Arising via a self-organization phenomenon driven by low-frequency drift-type modes, in which energy is transferred
Zonal_flow_(plasma)
Statistical property quantifying how much a collection of data is spread out
convergence. The Hadamard variance can be used to counteract linear frequency drift sensitivity. For categorical variables, it is less common to measure
Statistical_dispersion
Phenomenon in biology
Drift is the change in the frequency of an allele in a population due to random sampling in each generation. Draft is the change in the frequency of
Genetic_hitchhiking
spectrum is compared to what it should be. Frequency drift Frequency deviation Jitter Automatic frequency control Allan variance Rudolf Kingslake (2 December
Spectral_purity
Shortwave radio
imprecision inherent in analog tuners. Solid state components minimized frequency drift. Synchronous detection improved audio fidelity and stability. And miniaturization
Shortwave_radio_receiver
Frequency domain representation of random fluctuations in the phase of a waveform
oscillator might experience Frequency drift over long periods of time, slowly moving the center frequency of the Voigt lineshape. This drift is a brown noise source
Phase_noise
Type of magnetohydrodynamic instability
Drift wave turbulence is responsible for the transport of particles, energy and momentum across magnetic field lines. The characteristic frequency associated
Drift_waves
Overview article
wave whose frequency drifts over time; the coherence length can then be considered to be the distance over which it maintains a single frequency. This is
Physics_of_optical_holography
Definitions of terms used in amateur radio
into a digital signal. AF Audio Frequency AFC (Automatic Frequency Control) Automatically compensate frequency drift. AGC Automatic gain control for controlling
Glossary_of_amateur_radio
Subfield of genetics
change in frequency of alleles within populations. The main processes influencing allele frequencies are natural selection, genetic drift, gene flow
Population_genetics
the cavity magnetron in 1935, but the German military considered the frequency drift of Hollman's device to be undesirable, and based their radar systems
Hans_Hollmann
Norwegian musician
composer, producer, engineer, mix, guitar, keyboards, bass, vocals Frequency Drift - Personal Effects (Part Two) (2009), guitar Sinthome - Ficciones (2010)
Jacob_Holm-Lupo
Type of AC motor
motor is in principle as accurate as the line frequency of its power source. (Although small frequency drifts will occur over any given several hours, grid
Synchronous_motor
Relative frequency of a variant of a gene at a particular locus in a population
mutation combine to change allele frequencies across generations. Genetic drift causes changes in allele frequency from random sampling due to offspring
Allele_frequency
System of codes for unambiguously representing measurement units
unit for plane angle, to distinguish angular velocity from rotational frequency and to distinguish the radian from the steradian for solid angles. Each
Unified Code for Units of Measure
Unified_Code_for_Units_of_Measure
Type of atomic clock
current SI standard) might drift by a second in about 30 million years, whereas a strontium optical lattice clock would drift only about one second over
Optical_lattice_clock
y_{0}} is the fractional frequency error at t = 0 {\displaystyle t=0} ; D {\displaystyle D} is the linear fractional frequency drift rate; ϕ ( t ) {\displaystyle
Holdover in synchronization applications
Holdover_in_synchronization_applications
Effort to find civilizations not from Earth
the media that a signal had been detected but researchers noted the frequency drifted rapidly and the detection on three SETI@home computers fell within
Search for extraterrestrial intelligence
Search_for_extraterrestrial_intelligence
Deviation in spacecraft deceleration
and Pioneer 11. From their data, Anderson's team deduced a steady frequency drift of 1.5 Hz over eight years. This could be mapped on to a clock acceleration
Pioneer_anomaly
Change in allele frequencies that occurs over time within a population
primary explanation for adaptive evolution. Genetic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population
Microevolution
Circuit for shortwave receivers to improve reception
The "Wadley-drift-canceling-loop", also known as a "Wadley loop", is a system of two oscillators, a frequency synthesizer, and two frequency mixers in the
Wadley_loop
Term in proability theory
probability theory, stochastic drift is the change of the average value of a stochastic (random) process. A related concept is the drift rate, which is the rate
Stochastic_drift
Variable bandwidth variant of Allan variance
variable bandwidth modified variant of Allan variance, a measurement of frequency stability in clocks, oscillators and amplifiers. Its main advantage relative
Modified_Allan_variance
Laser source with equal intervals of spectral lines
Combs spanning an octave in frequency (i.e., a factor of two) can be used to directly measure (and correct for drifts in) f 0 {\displaystyle f_{0}}
Frequency_comb
Type of radio design
suffered from the thermal drift of the local oscillator which changed its frequency over time. To counteract this drift, the frequency of the local oscillator
Direct-conversion_receiver
Gradual change in the total energy of a closed system over time
In computer simulations of mechanical systems, energy drift is the gradual change in the total energy of a closed system over time. According to the laws
Energy_drift
Circuit component performing mathematical integration
of a non-ideal op-amp). Any DC (or very low frequency) component may then cause the op amp output to drift into saturation. To prevent this, the DC gain
Op_amp_integrator
Linear accelerator component
A radio-frequency quadrupole (RFQ) is a linear accelerator component generally used at low beam energies, roughly 2 keV to 3 MeV. It is similar in layout
Radio-frequency_quadrupole
Analog multiplexing technique used in early telephone systems
either 36–132 kHz or 172–268 kHz. A phase-locked loop corrected for any frequency drift between the modulation and demodulation oscillators. The mixers were
Carrier_telephony
Brown dwarf star in the constellation Leo
B≥1.8 kG. The pulses have a duration of 30–120 s and show a rapid frequency drift. The pulses are sporadic and have a left circular polarization fraction
WISEPC_J112254.73+255021.5
the Sagnac interferometer is hence insensitive to rotation or low frequency drift of its optical components, while maintaining a high sensitivity to
Common-path_interferometer
Type of optical illusion
The peripheral drift illusion (PDI) refers to a motion illusion generated by the presentation of a sawtooth luminance grating in the visual periphery
Peripheral_drift_illusion
Ground-based monopulse single object tracking radar
oscillator wave meter permitted the determination of spacecraft-transmitter frequency drift. Early in the installation program, it was realized that the range
AN/FPS-16 Instrumentation Radar
AN/FPS-16_Instrumentation_Radar
Type of noise produced by Brownian motion
Brownian noise contains infinite spectral power at low frequencies, the signal tends to drift away infinitely from the origin. A leaky integrator might
Brownian_noise
Expected reproductive success
relative fitness in the population (again setting aside changes in frequency due to drift and mutation). Relative fitnesses only indicate the change in prevalence
Fitness_(biology)
Principle in genetics
heterozygotes. In the absence of selection, mutation, genetic drift, or other forces, allele frequencies p and q are constant between generations, so equilibrium
Hardy–Weinberg_principle
shifts. The primary problem with this is practical: The bandwidth and frequency drift of most lasers is much greater than 1 Mhtz. The lasers needed for this
Rainbow_heterodyne_detection
Electromechanical device
high switching frequency to avoid undesirable effects. In signal processing circuits, use of a chopper stabilizes a system against drift of electronic
Chopper_(electronics)
Type of radar equipment
desired target and analyzing how the object's motion has altered the frequency of the returned signal. This variation gives direct and highly accurate
Doppler_radar
Power plant operation
the long-term frequency at the specified value within a wide area synchronous grid. Due to the disturbances, the average frequency drifts, and a time error
Power system operations and control
Power_system_operations_and_control
Change in a gene pool
spreading through the population by random genetic drift or positive selection. Once the frequency of the allele is at 100%, i.e. being the only gene
Fixation (population genetics)
Fixation_(population_genetics)
Ukrainian-French astronomer (1894–1976)
with the introduction of Temps Atomique International (TAI) based on the frequency of a cesium atomic standard. France's Académie des sciences awarded him
Nicolas_Stoyko
Average velocity of a fluid parcel in a gravity wave
For a pure wave motion in fluid dynamics, the Stokes drift velocity is the average velocity when following a specific fluid parcel as it travels with
Stokes_drift
Type of high-power semiconductor diode
high-frequency microwave electronics devices. They have negative resistance and are used as oscillators and amplifiers at microwave frequencies. They
IMPATT_diode
Oscillator with frequency controlled by a voltage input
signal suitable for transmission over a long distance, since the frequency will not drift or be affected by noise. Oscillators in this application may have
Voltage-controlled_oscillator
Rate of travel of electric energy
in vacuum. However, the electrons themselves move much more slowly (see drift velocity and electron mobility). By the 1740s, William Watson had conducted
Speed_of_electricity
Primary time standard globally used to regulate clocks and time
is not adjusted for daylight saving time. The coordination of time and frequency transmissions around the world began on 1 January 1960. UTC was first
Coordinated_Universal_Time
Ecological concept
intermediate frequency, is largely determined by selection if the selection coefficient s ≫ 1/N, and largely determined by neutral genetic drift if s ≪ 1/N
Effective_population_size
Electronic control system
would rapidly drift in frequency, an automatic correction signal was applied to the oscillator, maintaining it in the same phase and frequency of the desired
Phase-locked_loop
Maintaining one's gaze on a single location
Ocular drifts occur incessantly during intersaccadic fixation. Although the frequency of ocular drifts is usually lower than the frequency of ocular
Fixation_(visual)
Longitudinal oscillation of ions and electrons in a magnetized plasma
ion cyclotron frequency, Ωe is the electron cyclotron frequency and ωpi is the ion plasma frequency. This is the lower hybrid frequency, so called because
Lower_hybrid_oscillation
Science of the measurement of time
Kellogg Edey Allan variance Clock drift International Earth Rotation and Reference Systems Service Time and Frequency Standards Laboratory Time deviation
Chronometry
Type of klystron for generating low intensity microwaves
microwave source was needed whose frequency could be adjusted to match. A second magnetron would not work, they would not drift in sync. As the receiver circuit
Sutton_tube
Electronic measuring instrument
vibration, electromagnetic interference, drift due to age, and temperature variations, thus making the measured frequency seem higher or lower than the actual
Frequency_counter
Extracting timing information in serial communication
specific frequency that can drift from station to station. In order for receivers to accurately match the transmitter's own carrier frequency, the transmitter
Clock_recovery
64-bit x86 register
maximum resolved frequency at which the processor is booted. The maximum resolved frequency may differ from the maximum qualified frequency of the processor
Time_Stamp_Counter
Oscillator used in radio receivers
IF signal in the mixer stage of the receiver. Any drift of the local oscillator or the beat-frequency oscillator will affect the pitch of the received
Beat_frequency_oscillator
Type of degradation in signal transmission
(SCO), which may cause a gradual drift of the safe DFT window in addition to extra phase shift in the received frequency-domain signals. In frame-based
Carrier_frequency_offset
Physical phenomenon
the lowest possible random electric fields. The low-frequency spectrum will cause the E×B drift. Due to the long range nature of Coulomb interaction
Bohm_diffusion
High-gain voltage amplifier with a differential input
with changes in temperature. Temperature drift of the input offset voltage is especially important. Drift Real op-amp parameters are subject to slow
Operational_amplifier
2013 film by Guillermo del Toro
mental stress of piloting the machine through a mental link called the Drift. Initially proven to be highly effective, the Jaegers usher in a new era
Pacific_Rim_(film)
American magazine
The Drift is a magazine founded in June 2020 by Rebecca Panovka and Kiara Barrow. In The Drift's founding essay published June 24, 2020, Barrow and Panovka
The_Drift_(magazine)
Change in the heritable traits of populations
successive generations. It occurs when evolutionary processes such as genetic drift and natural selection act on genetic variation, resulting in certain characteristics
Evolution
Astronomical radio source discovered by the SETI@home project (March 2003)
years from Earth. It is also a very weak signal. The frequency of the signal has a rapid drift, changing by between 8 and 37 hertz per second. If the
SHGb02+14a
Motion of Earth's rotational axis relative to its crust
oscillation, and an irregular drift in the direction of the 80th meridian west, which has lately been less extremely west. The slow drift, about 20 m since 1900
Polar_motion
Temperature-controlled chamber for a quartz crystal
electronic components in the circuit are also vulnerable to temperature drift, usually the entire oscillator circuit is enclosed in the oven. A thermistor
Crystal_oven
greatly reduced long-term drift and higher sensitivity at very low frequencies (comparable to those of seismometers). Low drift is essential for detecting
MEMS_gravimeters
(Lands Below the Sahara) Paul Bohannan color 21m January 8, 1963 Continental Drift: The Theory of Plate Techtonics (American Geological Institute); Bert Van
List of Encyclopædia Britannica Films titles
List_of_Encyclopædia_Britannica_Films_titles
Amateur radio transceiver
response: 350 – 2700 Hz (-6 dB) Stability: less than 300 Hz drift from cold start, less than 100 Hz drift after 30 min warmup Ant output impedance: 50 ohms nominal
Yaesu_FT-7(B)
Gradual variation of the characteristics of a species along its territory
generated by genetic drift alone. It is unlikely that large-scale clines in genotype or phenotype frequency will be produced solely by drift. However, across
Cline_(biology)
1977 narrowband radio signal from SETI
Project Argus, SETI League executive director H. Paul Shuch made several drift-scan observations of the Wow! signal's coordinates with a 12-meter radio
Wow!_signal
Type of aircraft radar system
Once the drift angle is accurately measured, the antenna will be pointing directly in the direction of the drift. Any difference in frequency between the
Green_Satin_radar
Probability distribution
proportional to n. The best-known instance of Zipf's law applies to the frequency distribution of words in a text or corpus of natural language: w o r
Zipf's_law
input of the next stage in such a way as to permit signals with zero frequency, also referred to as direct current, to pass from input to output. This
Direct-coupled_amplifier
Downstream transport of invertebrate organisms in rivers and streams
there was a negative correlation between stream discharge and frequency of invertebrate drift. According to their 1995 study, river discharge could be attributed
Invertebrate_drift
FREQUENCY DRIFT
FREQUENCY DRIFT
Girl/Female
Muslim
One who remembers God frequently
Boy/Male
English American
Tile layer, or a. An English surname frequently used as a given name.
Surname or Lastname
English (most frequent in northern Ireland)
English (most frequent in northern Ireland) : from Middle English fe(i)th ‘belief (especially Christian belief)’, ‘faithfulness’, ‘loyalty’. This may have been a nickname for a trustworthy person, but was more probably bestowed on one who used ‘Faith!’ frequently as a mild oath or exclamation.
Surname or Lastname
English
English : unexplained. Perhaps a variant of Newborn. This name occurs frequently in NC.
Surname or Lastname
English (also frequent in Wales)
English (also frequent in Wales) : patronymic from the personal name Watkin.
Boy/Male
English American Shakespearean
Derived from the English place name, meaning Bede's ford. Most frequently used as a surname.
Surname or Lastname
Swedish (also frequent in Finland)
Swedish (also frequent in Finland) : ornamental name from an unexplained first element + the suffix -lin or -in, common suffixes of surnames.French (Hélin) : from a pet form of Hélie (see Helie 1).French (Hélin) : from the Germanic personal name Heilin, a short form of any of various compound names with the first element heil (see Heilmann 2).English : variant of Hillian.
Surname or Lastname
English (Devon)
English (Devon) : unexplained. This is a frequent name in OH.
Surname or Lastname
English
English : variant of Postlethwait. This is the more frequent spelling in the British Isles.
Surname or Lastname
English (Dorset)
English (Dorset) : unexplained. This name is frequent in Nova Scotia.
Surname or Lastname
English (frequent in eastern England)
English (frequent in eastern England) : ethnic name from Norman French aleman ‘German’ or alemayne ‘Germany’ (Late Latin Alemannus and Alemannia, from a Germanic tribal name that probably originally meant ‘all the men’). In some cases the surname may be from the region of Normandy known as Allemagne (south of Caen), probably named as a Germanic-speaking enclave in a Celtic area in Roman times. In North America, the form Allman has probably absorbed some cases of cognates from other languages, in particular Spanish Aleman and French Alleman.German (Allmann) : variant of Allemann (see Alleman) or in some cases probably an Americanized form of the same name.
Surname or Lastname
English
English : variant spelling of Byerly. In England this is the more frequent spelling.
Boy/Male
English American
Tile layer, or a. An English surname frequently used as a given name.
Girl/Female
Latin English
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Boy/Male
English American
A name beginning with D, also frequently used as an independent name.
Girl/Female
Latin
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Girl/Female
Arabic, Muslim
One who Remembers God Frequently
Girl/Female
Arabic, Muslim
Prolific; Frequently Producing
Girl/Female
Latin
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Girl/Female
Latin American English
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
FREQUENCY DRIFT
FREQUENCY DRIFT
Surname or Lastname
English (Hampshire, Dorset)
English (Hampshire, Dorset) : occupational name for a cowherd, from Old French vachier.
Female
Teutonic
Variant spelling of Teutonic Erminhild, IRMENHILD means "all warrior."
Female
Finnish
Finnish unisex name SISU means "determination."
Girl/Female
Indian, Sikh
Happy Mind
Boy/Male
Tamil
Samudrasen | ஸமà¯à®¤à¯à®°à®¾à®¸à¯‡à®¨
Lord of the ocean
Female
Japanese
 Japanese name GINA means "silvery." Compare with other forms of Gina.
Boy/Male
Sikh
Fame of Lord
Surname or Lastname
English
English : patronymic from Rand 1.
Girl/Female
African, American, Arabic, Assamese, Christian, Danish, English, Farsi, Finnish, French, German, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Muslim, Punjabi, Sikh, Sindhi, Swedish, Tamil, Telugu
A Flower Name; God's Gift; A Flower Name from the Older Form Jessamine; Jasmime Flower; A Plant in the Olive Family; Fragrant Flower
Biblical
movings; a person asleep
FREQUENCY DRIFT
FREQUENCY DRIFT
FREQUENCY DRIFT
FREQUENCY DRIFT
FREQUENCY DRIFT
n.
Frequency.
n.
The state of not being frequented; solitude; isolation; retirement; seclusion.
n.
The state of rarely occuring; uncommonness; rareness; as, the infrquence of his visits.
v. t.
To frequent; to resort to frequently; to visit pertinaciously or intrusively; to intrude upon.
adv.
At frequent or short intervals; many times; often; repeatedly; commonly.
n.
The condition of returning frequently; occurrence often repeated; common occurence; as, the frequency of crimes; the frequency of miracles.
pl.
of Frequency
a.
Too frequent.
n.
Frequency.
n.
A crowd; a throng.
a.
Frequent; numerous.
n.
Commonness; frequency.
n.
Frequency; abundance.
adv.
Frequently; often.
n.
A crowd; a throng; a concourse.
n.
Often to be met with; happening at short intervals; often repeated or occurring; as, frequent visits.
n.
Infrequency.
adv.
Frequently; often.
adv.
Frequently; often.
v. t.
To quote constantly or with great frequency.