VHF/UHF band switching tuner including a second diode in band switch loop

Claim 1

A band switching circuit incorporated in an input circuit for a tuner for receiving VHF signals and UHF signals on a plurality of bands, comprising: (a) means forming a part of said band switching circuit including a VHF tuning circuit for receiving the VHF signals and including a switching diode having an anode and a cathode for switching between a band containing a higher VHF signal and a band containing a lower VHF signal; (b) means including a plurality of resistors connected respectively to said anode and cathode of said switching diode to thereby form a series-connected circuit capable of sustaining current flow, said circuit having a control terminal to which band switching voltages can be applied; and (c) a second diode connected between the anode side of said switching diode and ground in said series-connected circuit in a direction opposite to said switching diode for blocking any current flowing in said circuit and through said switching diode when said terminal is rendered in a condition to turn off said switching diode.