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:
Aug. 03, 1982
Filed:
Dec. 04, 1980
Finis C Easter, Canoga Park, CA (US);
Sperry Corporation, New York, NY (US);
Abstract
A radio frequency transmitter-receiver alternately transmits signal pulses of frequency F.sub.1 and receives return echo signals of frequency F.sub.1. The transmitter signal of frequency F.sub.1 is generated by mixing signals of frequencies F.sub.2 and F.sub.3. A signal of frequency F.sub.3 is generated by mixing signals of frequencies F.sub.4 and F.sub.5. The return signal of frequency F.sub.1 is mixed with frequency F.sub.2 which is continuously generated by the transmitter to produce a signal of intermediate frequency F.sub.3. Frequency F.sub.5 and therefore frequencies F.sub.3 and F.sub.1 are only generated during signal transmission and therefore do not interfere with the return signal of frequency F.sub.1 and the produced intermediate frequency F.sub.3.