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:
Jul. 05, 1977
Filed:
Dec. 29, 1975
Applicant:
Inventors:
Walter Louis Berenson, Palatine, IL (US);
Ronald Wayne Taylor, Arlington Heights, IL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
325 62 ; 179 / ; 325 49 ; 325 50 ; 325 63 ; 325329 ;
Abstract
A mixer connected to receive a pilot signal from a suppressed carrier communications system and further connected to receive a signal from a crystal controlled oscillator with a plug-in crystal is disclosed. The output of the mixer is coupled through a very narrow bandpass filter tuned to pass only the converted pilot frequency. The output of the mixer develops a control signal which is coupled to a regulating input of variable gain amplifier means for regulating the gain of the amplifier means in direct proportion to changes in level of the pilot.