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Coaxial, one-quarter wavelength resonant primary and secondary resonators are employed in conjunction with a tetrode tube to provide, for example, 55 Kw (kilowatts) of output power for VHF, high-band television broadcasting. Coupling between the two resonators is accomplished by connecting an induct

Coaxial, one-quarter wavelength resonant primary and secondary resonators are employed in conjunction with a tetrode tube to provide, for example, 55 Kw (kilowatts) of output power for VHF, high-band television broadcasting. Coupling between the two resonators is accomplished by connecting an inductance between the center conductors of the resonators. The effective inductance of this connection is varied (and thus the coupling of the resonator circuits is also varied) by the addition of a variable capacitor in series with the inductive connection.

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A double tuned output circuit for a high power active device tunable over a given broad band of frequencies comprising: a primary coaxial cavity resonator having a center conductor coupled to a first terminal of said active device and a coaxial outer conductor coupled to a second terminal of said ac

A double tuned output circuit for a high power active device tunable over a given broad band of frequencies comprising: a primary coaxial cavity resonator having a center conductor coupled to a first terminal of said active device and a coaxial outer conductor coupled to a second terminal of said active device, a secondary coaxial cavity resonator having a center conductor and an outer conductor, and an adjustable inductive coupling device including an adjustable capacitor connected in series between the center conductors of said first and second resonators for, by adjustment of said series connected capacitor, adjusting the coupling between the primary and secondary resonators to exceed the desired critical coupling to achieve the desired broad band response.