Binary optionen n tv frequenz
It is primarily used in radio receivers to keep the receiver tuned to the frequency of the desired station. In radio communicationAFC is needed because, after the bandpass frequency of a receiver is tuned to the frequency of a transmitterthe 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 binary optionen n tv frequenz. 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.
AFC was mainly used in radios and television sets around the midth century. In the s, 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 maintained sufficiently stable frequencies that AFC's were no longer needed.
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