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Category:Automatic frequency control

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.

Automatic frequency control 
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Automatic Frequency Control (it); 自動周波数制御 (ja); Automatikus frekvenciaszabályozás (hu); Automatisk frekvenskontroll (sv); automatyczna regulacja częstotliwości (pl); АПЧ (uk); Automatic frequency control (nl); Автоматическая подстройка частоты (ru); 自动频率控制 (zh-cn); Automatic frequency control (de); Automatic frequency control (en); 自動頻率控制 (zh-hant); 自动频率控制 (zh-hans); Automatisk frekvenskontrol (da) Automatisk frekvensstyring (da); ARCz (pl)