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:
Mar. 08, 1977
Filed:
May. 21, 1975
Applicant:
Inventor:
David Michael Drury, Mundelein, IL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
H03G / ;
U.S. Cl.
CPC ...
325150 ; 325186 ;
Abstract
A harmonic filter failure detection apparatus for use in a single sideband radio transmitter is disclosed. A first directional coupler measures the power delivered to the harmonic filter and a second directional coupler measures the power passed through the harmonic filter. The power measurements of the first and second directional couplers are then compared in a latch type comparator circuit and a control signal output is developed which indicates whether or not the harmonic filter is operating properly. The control signal output is used to shut down the single sideband transmitter when a filter failure has been detected.