Automatic frequency control

Automatic frequency control

Automatic Frequency Control (AFC) is a method (or device) to automatically maintain a tuning of electromagnetic radiation (radio or microwave) signal to desired frequency.

Assuming that a receiver is nearly tuned to the desired frequency, a 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.

The AFC is also called Automatic Fine Tuning (AFT) in radio and TV receivers.

ee also

*Frequency synthesizer
*Frequency drift
*PLL


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  • Automatic frequency control — Die Automatische Frequenzregelung (AFC, von engl. Automatic Frequency Control) dient beim Rundfunk oder Fernsehempfang mittels eines Überlagerungsempfängers dazu, den Empfangsteil (Tuner) nach der Senderwahl automatisch auf diesen abgestimmt zu… …   Deutsch Wikipedia

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  • automatic frequency control characteristic — dažnio automatinio derinimo charakteristika statusas T sritis automatika atitikmenys: angl. automatic frequency control characteristic vok. Charakteristik der automatischen Frequenzregelung, f rus. характеристика автоматической подстройки частоты …   Automatikos terminų žodynas

  • automatic frequency control holding range — automatinio dažnio derinimo diapazonas statusas T sritis automatika atitikmenys: angl. automatic frequency control holding range vok. Haltgebiet bei automatischer Frequenzregelung, n rus. диапазон действия автоматической подстройки частоты, m… …   Automatikos terminų žodynas

  • automatic frequency control — FM stations tend to drift a little, so radios have incorporated the frequency control to automatically maintain the desired frequency …   Dictionary of automotive terms

  • frequency control — See automatic frequency control digital frequency control …   Dictionary of automotive terms

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  • station under automatic generation control — galią ir dažnį reguliuojanti elektrinė statusas T sritis automatika atitikmenys: angl. load and frequency control station; station under automatic generation control; station under load frequency control vok. Leistungs und Frequenzregelndes… …   Automatikos terminų žodynas

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