JPS6422117A - Tracking correcting circuit for antenna circuit - Google Patents

Abstract

PURPOSE:To facilitate a tracking adjustment by connecting a voltage variable circuit to an electrode facing to the electrode to impress the station selecting voltage of a variable capacity diode and providing an adjustable setting circuit. CONSTITUTION:When a station selecting voltage impressed to the cathode of a variable capacity diode 2 in a main tuning circuit 1 is changed in a decreasing direction at a low voltage area, at the time of a station selecting voltage (V1), the variable voltage of a voltage variable circuit 7 is impressed to the anode of the variable capacity diode 2 so that the voltage can be a voltage (V2) lower than it apparently. Consequently, the capacity of the variable capacity diode 2 is increased only by C because the voltage V1 is reduced to the V2 apparently, the shortage capacity is corrected and a linearity can be improved. From which of an area with a low station selecting voltage the variable voltage is impressed is set by the adjustment of a variable contact 9' of a variable resistance R4 at a setting circuit 9.