Automatic Frequency Control (AFC): An electronic means for preventing drift in radio frequency or maintaining the frequency within specified limits. The afc maintains the local oscillator of the radar on the frequency necessary to obtain a constant or near constant difference in the frequency of the radar echo (magnetron frequency) and the local oscillator frequency.

 

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Local Control: Method of controlling the final quality of a print by increasing or decreasing the exposure given to localized areas of the print by selective masking.