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:
May. 24, 1977
Filed:
Apr. 30, 1976
Lowell G Atkinson, Indianapolis, IN (US);
General Aviation Electronics, Inc., Indianapolis, IN (US);
Abstract
A voltage variable filter circuit useful, for example, in a radio frequency transmitting device and having a center frequency which is changeable with changes in an applied voltage employs one or more voltage variable reactive elements in the filter in conjunction with circuitry for changing the direct current voltage across such reactive elements to change the reactance thereof and therefore also change the center frequency of the filter. To extend the range of filter variation, additional reactance may be selectively introduced into the filter circuit. In the environment of a multi-channel radio frequency transmitting device, a selector switch simultaneously selects one radio frequency channel for transmission and a unique voltage source for application to the voltage variable reactance so that the filter is appropriately tuned for the selected channel.