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Radio circuit
radio equipment, Automatic Frequency Control (AFC), also called Automatic Fine Tuning (AFT), is a method or circuit to automatically keep a resonant circuit
Automatic_frequency_control
System adjusting the output of electric generators
In an electric power system, automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants
Automatic_generation_control
Electronic circuit to automatically adjust signal strength
Automatic gain control (AGC), sometimes Automatic volume control (AVC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers
Automatic_gain_control
Type of FM detector circuit
William Seeley. The Foster–Seeley discriminator was envisioned for automatic frequency control of receivers, but also found application in demodulating an FM
Foster–Seeley_discriminator
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
Service to direct pilots of aircraft
a control tower but still requires arriving and departing aircraft to communicate with other aircraft or a radio operator on a published frequency. Mandatory
Air_traffic_control
Use of various control systems for operating equipment
advances in automatic controls include differential equations, stability theory and system theory (1938), frequency domain analysis (1940), ship control (1950)
Automation
Type of adjustable-speed drive
variable voltage variable frequency drive, VVVF drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by
Variable-frequency_drive
variance Clock drift Phase noise Automatic frequency control (AFC) Phase-locked loop (PLL) "Frequency Drift". Time and Frequency from A to Z. Boulder, CO, USA:
Frequency_drift
Power plant operation
approximated by the frequency bias coefficient of the area control error (ACE) calculation used for automatic generation control. The secondary control is used to
Power system operations and control
Power_system_operations_and_control
Frequency used on standard electricity grid in a given area
reducing the frequency of the generated current; excess force deposits rotational energy, increasing frequency. Automatic generation control (AGC) maintains
Utility_frequency
US military portable radio transceiver
incorporated an adjustable squelch circuit, an automatic frequency control circuit, a crystal controlled calibration circuit, easy to use tuning/channel
SCR-300
Manufacturer of audio equipment
their first products, the 7 tube A-100 AM - FM tuner featuring automatic frequency control, priced at $70.50 (equivalent to $845 in 2025) and the Festival
Harman_Kardon
Topics referred to by the same term
Automated fare collection systems for public transport Automatic frequency control Automated Frequency Coordination, a system for coordinating Wi-Fi channels
AFC
Soviet early warning radar
A-scope. Like the P-12 the radar features automatic frequency control with four pre-set operating frequencies, moving target indicator to eliminate passive
P-18_radar
Class of train protection systems for railways
Automatic train control (ATC) is a general class of train protection systems for railways that involves a speed control mechanism in response to external
Automatic_train_control
Electronic method of transmitting information with a carrier wave
phase deviation. Compare to the modulation index for frequency modulation. Automatic frequency control Modulation sphere Polar modulation Electro-optic modulator
Phase_modulation
Railway signaling system
maintaining or even improving safety. A CBTC system is a "continuous, automatic train control system utilizing high-resolution train location determination,
Communications-based train control
Communications-based_train_control
Cruise control advanced driver-assistance system
Adaptive cruise control (ACC) is a type of advanced driver-assistance system for road vehicles that automatically adjusts the vehicle speed to maintain
Adaptive_cruise_control
Automatic Performance Control (APC) was the first engine knock and boost control system. The APC was invented by Per Gillbrand at the Swedish car maker
Automatic_Performance_Control
Aircraft surveillance technology
Automatic Dependent Surveillance–Broadcast (ADS-B) is an aviation surveillance technology and form of electronic conspicuity in which an aircraft determines
Automatic Dependent Surveillance–Broadcast
Automatic_Dependent_Surveillance–Broadcast
Canadian-American engineer and businessman
first products were the 7 tube A-100 AM - FM tuner featuring automatic frequency control, priced at $70.50 (equivalent to $845 in 2025) and the Festival
Sidney_Harman
Vacuum tube used for amplifying radio waves
in a variation in frequency. This effect is used to good advantage for automatic frequency control in receivers, and in frequency modulation for transmitters
Klystron
Power management technique in computers
Dynamic frequency scaling (also known as CPU throttling) is a power management technique in computer architecture whereby the frequency of a microprocessor
Dynamic_frequency_scaling
Device which extracts info from a modulated radio frequency current or voltage
London, 1976 pages 4-48 through 4-51 Charles Travis, "Automatic oscillator frequency control system" U.S. patent 2,294,100 (filed: 4 February 1935; issued:
Detector_(radio)
Vacuum tube used to display images
resolution of the CRT). The higher frequency makes it more susceptible to interference, so an automatic frequency control (AFC) circuit may be used to lock
Cathode_ray_tube
Electronic control system
the frequency of a controlled oscillator to the reference, automatically raising or lowering the frequency of the oscillator until its frequency (but
Frequency-locked_loop
Telecommunication signaling system
telephony to control equipment and signal user intent. The signaling on trunks in the telephone network uses a different type of multi-frequency signaling
DTMF_signaling
– "Scooby Don't" Sunday 14 Sept.. '97 (1997), Enraptured – "Automatic Frequency Control" Electronic Lullabies (1998), Creeping Bent – "MV 3" The Battle
Mount_Vernon_Arts_Lab
Milking of dairy animals without human labour
Automatic milking is the milking of dairy animals, especially of dairy cattle, without human labour. Automatic milking systems (AMS), also called voluntary
Automatic_milking
Intelligent network based lighting control
night and automatically adjusting the lighting when a household is away to make it appear as though there are occupants. Lighting control systems typically
Lighting_control_system
Electric circuit that generates sine waves
the oscillator, with automatic gain control using an incandescent lamp. Under the condition that R1=R2=R and C1=C2=C, the frequency of oscillation is given
Wien_bridge_oscillator
Device used to control other devices remotely
Control (1939) was a battery-operated low-frequency radio transmitter, thus making it the first wireless remote control for a consumer electronics device. Using
Remote_control
Type of portable robot
issue steering commands and speed commands. Frequency select mode bases its decision on the frequencies being emitted from the floor. When an AGV approaches
Automated_guided_vehicle
spectrum is compared to what it should be. Frequency drift Frequency deviation Jitter Automatic frequency control Allan variance Rudolf Kingslake (2 December
Spectral_purity
Definitions of terms used in amateur radio
AF Audio Frequency AFC (Automatic Frequency Control) Automatically compensate frequency drift. AGC Automatic gain control for controlling gain on the
Glossary_of_amateur_radio
Electrical distribution safety technique
Bevrani, Hassan; Hiyama, Takashi (2017-12-19). Intelligent Automatic Generation Control. CRC Press. ISBN 978-1-4398-4954-5. Retrieved 2025-05-18. Mozina
Load_shedding
Control loop feedback mechanism
a feedback-based control loop mechanism commonly used to manage machines and processes that require continuous control and automatic adjustment. It is
PID_controller
multiple switchboard control Heavy consumers logic Automatic start and connect after blackout Automatic line frequency adjustment Control of diesel electric
Power_management_system
Branch of engineering and mathematics
theory of discontinuous automatic control systems, and applied the bang-bang principle to the development of automatic flight control equipment for aircraft
Control_theory
Property of power grids
providing the automatic generation control and the grid operator with valuable time (few seconds) to rebalance the system The grid frequency is the combined
Inertial_response
Radio signal transmission method
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying
Frequency-hopping spread spectrum
Frequency-hopping_spread_spectrum
Process in power generation
isochronous frequency control, maintaining constant system frequency independent of load. The sequence of events is similar for manual and automatic synchronization
Synchronization (alternating current)
Synchronization_(alternating_current)
Oscillations in an electric grid
was oscillating with a frequency of 0.26 Hz for about 30 seconds. At some point a sequence of faults and operations of automatic protection relays caused
Grid_oscillation
standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of frequency channels numbered at 5 MHz spacing
List_of_WLAN_channels
employ optimal targeting in which frequency and tidal volume of breaths of a patient on the ventilator are automatically adjusted and optimized to mimic
Modes of mechanical ventilation
Modes_of_mechanical_ventilation
Transmitting data from a utility meter
Automatic meter reading (AMR) is the technology of automatically collecting consumption, diagnostic, and status data from water meter or energy metering
Automatic_meter_reading
Spanish train protection system
cable for controlling small relays inside the transponder which switch capacitors in/out of the coil circuit and determine which frequency is detected
Anuncio de Señales y Frenado Automático
Anuncio_de_Señales_y_Frenado_Automático
Type of automotive ECU
ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely
Transmission_control_unit
Motorized device that opens and closes garage doors
notification on garage opener frequencies (PDF) Garage Door Opener Safety Tips (Washington Post) Safety Commission Rules For Automatic Garage Door Openers - U
Garage_door_opener
Broadcast of aeronautical information
ATIS frequencies UK ATIS frequencies Sydney Australia live web-based ATIS EUROCONTROL > ATM Performance > EATM > ACARS > Overview Digital Automatic Terminal
Automatic terminal information service
Automatic_terminal_information_service
Electronic tracking technology
Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists
Radio-frequency identification
Radio-frequency_identification
Building automation for a home
electric power transmission wiring for signalling and control, where the signals involve brief radio frequency bursts of digital data, and remains the most widely
Home_automation
Railway track status technology
Audio-Frequency cab signals. MTA Staten Island Railway Automatic Speed Control: A hybrid of the PRR/LIRR systems and Rapid Transit power-frequency cab code
Pulse_code_cab_signaling
English engineer (1902–1971)
telephones. He was also responsible for innovations in the design of automatic frequency control circuits, digital delay lines and condenser microphones. Reeves
Alec_Reeves
British military communication system
The Defence High Frequency Communications Service or the DHFCS is a British military beyond line-of-sight communication system operated by the Ministry
Defence High Frequency Communications Service
Defence_High_Frequency_Communications_Service
Graph of the frequency response of a control system
In electrical engineering and control theory, a Bode plot is a graph of the frequency response of a system. It is usually a combination of a Bode magnitude
Bode_plot
Data network that uses electrical wiring
Ripple control adds an audio-frequency tone to an AC line. Typical frequencies are from 100 to 2400 Hz. Each district usually has its own frequency, so that
Power-line_communication
Representation of a signal as a rectangular wave with varying duty cycle
is to control a load; however, the PWM switching frequency must be selected carefully in order to smoothly do so. The PWM switching frequency can vary
Pulse-width_modulation
Cold War-era British early warning radar
receiver, tube-by-tube. In contrast, this Automatic Frequency Control ensured the output intermediate frequency was always 13.5 MHz, no matter what was
AMES_Type_80
American radio engineer
----- Volume I Automatic Frequency Control Systems 1937 ----- Servicing By Signal Tracing 1939 ----- FM: An Introduction To Frequency Modulation March
John_F._Rider
adjusted. One control offered processor frequency levels, and the ability to set a minimum and maximum "window", where the automatic controls would not adjust
LongRun
Type of radio receiver
incoming radio-frequency (RF) signals to a fixed intermediate frequency (IF). The signal is then amplified and filtered at that fixed frequency. This arrangement
Superheterodyne_receiver
Plastic welding using high frequency electrical fields
Radio-frequency welding, also known as dielectric welding and high-frequency welding, is a plastic welding process that utilizes high-frequency electric
Radio-frequency_welding
Audio signal processing device which prevents or suppress audio feedback
use three main methods to control feedback, frequency shifting, adaptive filtering and automatic notch filtering Frequency shifting is the oldest feedback
Feedback_suppressor
3–30 MHz range of the electromagnetic spectrum
However, the development of Automatic Link Establishment technology based on MIL-STD-188-141 for automated connectivity and frequency selection, along with
High_frequency
Advanced method of process control
"Min-max feedback model predictive control for constrained linear systems". IEEE Transactions on Automatic Control. 43 (8): 1136–1142. doi:10.1109/9.704989
Model_predictive_control
Electronic control system
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
Electrical device used to detect the presence of trains on rail tracks
modulation can be detected by equipment on the trains and used for automatic train control, so long as the transmitter end (Tx) is at the front of the train
Track_circuit
Process of balancing the supply of electricity on a network
contrast, as the grid recovers, its frequency naturally rises to normal, so frequency-controlled load control automatically enables water heaters, air-conditioners
Load_management
Electronic devices that generate electronic signals
complex automatic test systems. In June 1928, the General Radio 403 was the first commercial signal generator ever marketed. It supported a frequency range
Signal_generator
Russian ground-based jamming system
warning and control system (AWACS), by automatically inducing a jamming frequency on radar carrier frequencies operating in the fast frequency hopping mode
Pelena-1
Device for receiving radio transmissions
remote control. A radio receiver is connected to an antenna which converts some of the energy from the incoming radio wave into a tiny radio frequency AC
Radio_receiver
Engineering discipline that deals with control systems
input are called automatic control systems (such as cruise control for regulating the speed of a car). Multi-disciplinary in nature, control systems engineering
Control_engineering
Class of vehicle protection systems for railways
switch. Automatic train stop differs from the concept of automatic train control in that ATS usually does not feature an onboard speed control mechanism
Automatic_train_stop
Radio transmitter to locate people in distress
required, by FAA policy, to monitor this frequency when it is possible to do so. The frequency can be used by Automatic Direction Finder (ADF) radionavigation
Emergency position-indicating radio beacon
Emergency_position-indicating_radio_beacon
Process where information about current status is used to influence future status
often involves frequency compensation to control the location of the poles of the amplifier. Electronic feedback loops are used to control the output of
Feedback
Radio frequency absorption
advanced uplink power control systems that offer automatic controls to prevent transponder saturation make uplink power control systems an effective,
Rain_fade
Soviet and Russian automatic train signaling system
lokomotivnaya signalizatsiya nepreryvnaya, meaning Continuous Automatic Train Signalling) is a train control system used widely on the main lines of the ex-Soviet
ALSN
Aircraft controlled remotely via radio control
three-channel gliders which use only rudder control for steering and dihedral or polyhedral wing shape to automatically counteract rolling are popular as training
Radio-controlled_aircraft
Type of electrical switch
providing temporary power. The control capability of a transfer switch may be manual only, or a combination of automatic and manual. The switch transition
Transfer_switch
Radio station in New York City (1925–1934)
Street. They also installed a new 1,000 watt transmitter with automatic frequency control and new speech amplifiers at the Coytesville transmitter site
WRNY_(New_York_City)
Type of electronic circuit
Analog filters (especially voltage-controlled filters) Analog signal processing Automatic gain control Companding Frequency mixer PAM-pulse amplitude modulation
Analog_multiplier
Process of varying one or more properties of a periodic waveform
performs: Bandpass filtering. Automatic gain control, AGC (to compensate for attenuation, for example fading). Frequency shifting of the RF signal to the
Signal_modulation
Train protection system in Japan
Advanced Train Administration and Communications System (ATACS) is an automatic train control (ATC) system developed by RTRI starting from 1995[citation needed]
ATACS
Electronic oscillator
Modern continuous spectrometers use automatic frequency control to lock the oscillator to the resonator frequency. In many applications, continuous-wave
Robinson_oscillator
loop-shaping, which allows the control designer to apply classical loop-shaping concepts to the multivariable frequency response to get good robust performance
H-infinity methods in control theory
H-infinity_methods_in_control_theory
Standards and procedures intended to protect from the damaging effects of electricity
Indirect contact – can be avoided by automatic disconnection for TT system, automatic disconnection for TN systems, automatic disconnection on a second fault
Electrical_safety_standards
Approach to controller design that explicitly deals with uncertainty
the development of the theory of the so-called classical control; it mainly entails frequency response methods to navigate between such tradeoffs. Chief
Robust_control
Mobile ground-controlled approach radars introduced during World War II
distribution panel. The -11D model was similar to the -11C with automatic frequency control (AFC) and was fully interchangeable with the -11C. The 600 kW
AN/MPN
Ability to automatically recognize targets
Automatic target recognition (ATR) is the ability for an algorithm or device to recognize targets or other objects based on data obtained from sensors
Automatic_target_recognition
Automatic train control systems
Bombardier) for the equipment on board a train used as a part of an Automatic Train Control system. Three different families exist, which are technically unrelated
EBICAB
Physical security access control system
video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each
Mantrap_(access_control)
Use of radio signals to remotely control a device, vehicle or drone
coherer-based radio control. With an eye towards selling the idea to the US government as a torpedo, Tesla's 1898 patent included a clockwork frequency changer so
Radio_control
commercial Yes Yes Yes Yes Yes Automatic, adaptive FDTD/FIT, FEM, MLFMM, MoM, SBR, PIC General purpose – statics, low-frequency, microwaves and RF, terahertz
Comparison of EM simulation software
Comparison_of_EM_simulation_software
When voltage across/within a circuit is raised beyond the design limit
sustained (also known as power frequency overvoltage) with a stable value on multiple terminals. In an electrical grid, voltage control and reactive power management
Overvoltage
Electrical device which utilizes a sensor to detect nearby motion
system that automatically performs a task or alerts a user of motion in an area. They form a vital component of security, automated lighting control, home control
Motion_detector
Entity in the US electric system
a balancing authority area (also known as a control area) and support for real-time load-frequency control. The balancing authorities are connected by
Balancing_authority
20th-century publisher of science and science fiction
Street. They also installed a new 1000 watt transmitter with automatic frequency control and new speech amplifiers at their plant in Coytesville NJ. These
Experimenter_Publishing
Radios operating in the very high frequency maritime mobile band
ship-to-aircraft. It uses FM channels in the very high frequency (VHF) radio band in the frequency range between 156 and 174 MHz, designated by the International
Marine_VHF_radio
AUTOMATIC FREQUENCY-CONTROL
AUTOMATIC FREQUENCY-CONTROL
Boy/Male
Indian
Aromatic
Girl/Female
Arabic, Muslim
Prolific; Frequently Producing
Girl/Female
Muslim
Aromatic
Girl/Female
Arabic, Australian, Muslim
Kind of Aromatic Plant
Boy/Male
Muslim
Aromatic
Girl/Female
Muslim
Aromatic, A narrator of Hadith
Surname or Lastname
English (also frequent in Wales)
English (also frequent in Wales) : patronymic from the personal name Watkin.
Girl/Female
Arabic, Muslim
Aromatic
Girl/Female
Arabic, Muslim
Aromatic; Rare Moon
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.
Boy/Male
Muslim/Islamic
Aromatic
Girl/Female
Afghan, Arabic, Australian
Aromatic; Sweet Basil
Girl/Female
Arabic, Muslim
Aromatic; Sweet Basil
Boy/Male
Arabic, Muslim
Fragrant; Aromatic
Girl/Female
Arabic, Muslim
Aromatic Sweet Basil
Girl/Female
Muslim
Flower, Kind of aromatic plant
Girl/Female
Latin
Fortuna.
Girl/Female
Muslim/Islamic
Aromatic
Girl/Female
Muslim/Islamic
Aromatic
Girl/Female
Arabic, French, Muslim
Aromatic
AUTOMATIC FREQUENCY-CONTROL
AUTOMATIC FREQUENCY-CONTROL
Boy/Male
Greek American French
Tame.
Boy/Male
Muslim/Islamic
Strength
Surname or Lastname
English (Essex and southeastern counties)
English (Essex and southeastern counties) : variant of the Lancashire name Fairclough, altered by folk etymology.
Girl/Female
Hindu
Sign of wealth
Girl/Female
Hungarian
Princess.
Female
Polish
Hungarian and Polish form of Latin Isabella, IZABELLA means "God is my oath."Â
Girl/Female
Muslim Arabic
Hopes. Aspirations. Wishes.
Boy/Male
Muslim
Conductor. Guide.
Girl/Female
British, English, Greek
God Appearance
Boy/Male
Tamil
AUTOMATIC FREQUENCY-CONTROL
AUTOMATIC FREQUENCY-CONTROL
AUTOMATIC FREQUENCY-CONTROL
AUTOMATIC FREQUENCY-CONTROL
AUTOMATIC FREQUENCY-CONTROL
n.
Frequency.
n.
A crowd; a throng.
n.
Frequency.
n.
The condition of returning frequently; occurrence often repeated; common occurence; as, the frequency of crimes; the frequency of miracles.
n.
A crowd; a throng; a concourse.
a.
Automatic.
a.
Alt. of Automatical
n.
An apparatus for automatic ignition.
n.
The state or quality of being automatic; the power of self-moving; automatic, mechanical, or involuntary action. (Metaph.) A theory as to the activity of matter.
pl.
of Frequency
adv.
At frequent or short intervals; many times; often; repeatedly; commonly.
n.
Frequency; abundance.
v. t.
To frequent; to resort to frequently; to visit pertinaciously or intrusively; to intrude upon.
n.
Commonness; frequency.
a.
Pertaining to, or produced by, an automaton; of the nature of an automaton; self-acting or self-regulating under fixed conditions; -- esp. applied to machinery or devices in which certain things formerly or usually done by hand are done by the machine or device itself; as, the automatic feed of a lathe; automatic gas lighting; an automatic engine or switch; an automatic mouse.
n.
Infrequency.
n.
Often to be met with; happening at short intervals; often repeated or occurring; as, frequent visits.
adv.
In an automatic manner.
pl.
of Automaton
a.
Not voluntary; not depending on the will; mechanical; as, automatic movements or functions.