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:
Jan. 31, 1978
Filed:
Apr. 16, 1976
Francis W Hopwood, Severna Park, MD (US);
Lester K Staley, Towson, MD (US);
Henry D Tolj, Lutherville, MD (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
An automatic frequency control for causing a local oscillator to track the frequency of a transmitter such that the received echo of a transmitted pulse may be combined with the output of the local oscillator in a mixer to provide an intermediate frequency signal which is suitable for amplification, filtering and detection operations. The automatic frequency control includes an average frequency control loop for determining the average frequency of the local oscillator output signal, an electromechanical frequency transducer cooperating with a sample and hold circuit for providing a modulating signal to modulate the average frequency of the local oscillator output signal in response to the frequency of the next pulse to be provided by the transmitter, and a modulation gain control loop for controlling the gain of the modulating signal to compensate for variations in the transfer functions of the electromechanical frequency transducer and the sample and hold circuit.