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:
Jun. 02, 1981
Filed:
Mar. 20, 1980
Peter Strammello, Jr, Arlington Heights, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
A conventional varactor tuned VHF/UHF television tuner with additional inductors placed in parallel in each VHF tuned circuit by means of diode switching provides an additional tuning capability over the CATV Superband. Selective tuning to any broadcast channel within the VHF, UHF and CATV bands is achieved by voltage-controlled tunable circuitry such as the type employing varactor diodes responsive to an adjustable DC tuning voltage having unique levels assigned to the various desired channels. By providing an additional bandswitching input voltage to a conventional tuner, Superband coils are diode-switched in parallel with VHF tuned circuits permitting an expanded tuning frequency range. This parallel coil approach in achieving Superband coverage permits the utilization of spring-wound VHF-band and Superband coils to facilitate tuning circuit alignment and to eliminate the need for a discrete Superband tuner or a CATV converter.