Signal translating networks and control circuits for the tuners of signal receivers

Claim 1

In combination with a signal receiver of a type including a tuner of a type employing the voltage variable capacitance characteristic of a voltage variable capacitance diode for varying the tuning of said receiver and a plurality of channel selecting networks for selecting different channels to which said receiver may be tuned and applying via a conductor different voltages to said diode to change the tuning of said receiver; a network for compensating for different sensitivities of different ones of said channels and providing manual fine tuning comprising a transistor having base, collector and emitter electrodes, first and second terminals at two different D.C. potentials, resistors of equal magnitude connected between said first terminal and said collector electrode and between said second terminal and said emitter electrode and a potentiometer connected between said collector and emitter electrodes in series with said resistors, whereby the voltage developed across said potentiometer varies with the conductivity of said transistor, said potentiometer having a slideR, means connecting said conductor to said base electrode, whereby the conductivity of said transistor may be varied responsive to changes in the voltage on said conductor, a source of D.C. potential for said channel selecting networks connected to vary said different voltages in response to changes in the D.C. potential of said source, and means for varying the D.C. potential of said source in response to movement of said slider.