THECONFIDENTIALFREQUENCIES20120229
Automatic Frequency Control (AFC) is a method (or device) to automatically keep a resonant circuit tuned to the frequency of an incoming radio signal. It is primarily used in radio receivers to keep t, 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., In radio equipment, interrupting the reception. This can be caused by a poorly controlled transmitter frequency, the two frequencies may drift apart