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. 11, 1977
Filed:
Jan. 26, 1976
Gustaf J Rast, Jr, Huntsville, AL (US);
Thomas A Barley, Huntsville, AL (US);
James R Ashley, Colorado Springs, CO (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
A wide operating frequency range transmission line discriminator uses an imum length transmission line which permits near carrier frequency modulation to be measured on a carrier frequency in a broad range from approximately two megahertz to one gigahertz. A hybrid junction, balanced phase detector, power dividers, attenuators and a variable transmission line coupled with the optimum length transmission line provide a wide frequency range discriminator with only a minimum exchange in selected components being necessary for changes in carrier frequency. This near carrier analyzer operates over the wide frequency range with the only component changes being an input bandpass filter, the optimum length transmission line, and the variable length transmission line used as a variable or adjustable phase shift device. The transmission line sections are easily changed by simply selecting proper line lengths which may be previously established. When optimum detection is not essential in a particular measurement, the optimum length transmission line can effectively operate and accomplish its function over several octaves of frequency range with minimal analyzer degradation, on the order of three decibels. In measuring frequency modulation noise, carrier nulling in excess of 60 decibels is accomplished. After this carrier null has been accomplished, the discriminator circuit rejects incidental amplitude modulation on the test signal, and is not restricted by burnout power ratings of crystals within the phase detector.