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- Automatic_frequency_control abstract "In radio equipment, Automatic Frequency Control (AFC), also called Automatic Fine Tuning (AFT), is a method or circuit to automatically keep a resonant circuit tuned to the frequency of an incoming radio signal. It is primarily used in radio receivers to keep the receiver tuned to the frequency of the desired station. In radio communication, AFC is needed because, after the bandpass frequency of a receiver is tuned to the frequency of a transmitter, the two frequencies may drift apart, interrupting the reception. This can be caused by a poorly controlled 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 of the electronic components.Assuming that a receiver is nearly tuned to the desired frequency, the AFC circuit in the receiver develops an error voltage proportional to the degree to which the receiver is mistuned. This error voltage is then fed back to the tuning circuit in such a way that the tuning error is reduced. In most frequency modulation (FM) detectors, an error voltage of this type is easily available. See Negative feedback.AFC was mainly used in radios and television sets around the mid-20th century. In the 1970s, receivers began to be designed using frequency synthesizer circuits, which synthesized the receiver's input frequency from a crystal oscillator using the vibrations of an ultra-stable quartz crystal. These had a stable enough frequency that AFC was not needed.".
- Automatic_frequency_control wikiPageExternalLink rx11.en.html.
- Automatic_frequency_control wikiPageID "2527996".
- Automatic_frequency_control wikiPageRevisionID "581885721".
- Automatic_frequency_control hasPhotoCollection Automatic_frequency_control.
- Automatic_frequency_control subject Category:Communication_circuits.
- Automatic_frequency_control subject Category:Wireless_tuning_and_filtering.
- Automatic_frequency_control type Artifact100021939.
- Automatic_frequency_control type Circuit103033362.
- Automatic_frequency_control type CommunicationCircuits.
- Automatic_frequency_control type Device103183080.
- Automatic_frequency_control type ElectricalDevice103269401.
- Automatic_frequency_control type Instrumentality103575240.
- Automatic_frequency_control type Object100002684.
- Automatic_frequency_control type PhysicalEntity100001930.
- Automatic_frequency_control type Whole100003553.
- Automatic_frequency_control comment "In radio equipment, Automatic Frequency Control (AFC), also called Automatic Fine Tuning (AFT), is a method or circuit to automatically keep a resonant circuit tuned to the frequency of an incoming radio signal. It is primarily used in radio receivers to keep the receiver tuned to the frequency of the desired station.".
- Automatic_frequency_control label "Automatic Frequency Control".
- Automatic_frequency_control label "Automatic frequency control".
- Automatic_frequency_control label "Automatic frequency control".
- Automatic_frequency_control label "Automatyczna regulacja częstotliwości".
- Automatic_frequency_control label "Автоматическая подстройка частоты".
- Automatic_frequency_control label "自動周波数制御".
- Automatic_frequency_control sameAs Automatic_frequency_control.
- Automatic_frequency_control sameAs Automatic_Frequency_Control.
- Automatic_frequency_control sameAs 自動周波数制御.
- Automatic_frequency_control sameAs Automatyczna_regulacja_częstotliwości.
- Automatic_frequency_control sameAs m.07l3pm.
- Automatic_frequency_control sameAs Q220786.
- Automatic_frequency_control sameAs Q220786.
- Automatic_frequency_control sameAs Automatic_frequency_control.
- Automatic_frequency_control wasDerivedFrom Automatic_frequency_control?oldid=581885721.
- Automatic_frequency_control isPrimaryTopicOf Automatic_frequency_control.