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write common abbreviations (as an alternative name) in bold and parentheses per MOS:BOLDALTNAMES |
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[[File:APCh2.svg|thumb|Basic automatic frequency control in a radio receiver. У = RF amplifier stages, Д = frequency discriminator stage]]
In [[radio]] equipment, '''Automatic Frequency Control''' ('''AFC'''), also called '''Automatic Fine Tuning''' ('''AFT'''), is a method or circuit to automatically keep a [[resonant circuit]] [[Tuner (electronics)|tuned]] to the [[frequency]] of an incoming [[radio signal]]. It is primarily used in [[radio receiver]]s 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.
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