The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1976
Filed:
Apr. 20, 1971
Rufus F Shelby, Philadelphia, PA (US);
Aeronutronic Ford Corporation, Blue Bell, PA (US);
Abstract
When voltage variable capacitor (VVC) diodes are used to tune the r-f circuits of receivers, a potentiometer is usually used as the mechanically operated source of variable voltage. To avoid tuning problems associated with power line variations, or receiver circuit conditions that cause voltage variations, a well regulated source of d-c voltage is used to supply the control circuits. The improvement disclosed here involves applying an automatic frequency control (AFC) voltage, also known as automatic fine tuning (AFT) voltage, to the control circuit of the voltage regulator. Since the tuning voltages are obtained from the regulated source, the magnitude of regulated voltage will be controlled by the AFC voltage. If the polarity of AFC action is set to minimize the AFC error voltage, automatic frequency control or fine tuning is achieved.