| 摘要 |
PURPOSE:To correct automatically a tracking error between tuning circuits at lots of points in a reception band by sectioning the reception band into plural stages, varying the correction capacity of a correction capacitor at each section so as to apply tracking adjustment. CONSTITUTION:A variable resistor 7 in interlocking with the channel selection operation by a turning coil 4 is provided and a DC voltage proportional to the received frequency band is obtained from the output terminal. Suppose that the variable range of the said voltage is a0-a4, when it is, e.g., a0-a1, an output is obtained from a NAND circuit 10 only. A transistor (Tr)14a is conducted by the output and a +B power supply is fed to each input terminal 21a only in voltage setting circuits 15, 16, 17. Then a control section 22a of the said voltage setting circuit closes a switch device 20a only, the voltage for tracking error adjustment set by a voltage generating circuit 18a is inputted to a correction capacitor 6 of tuning circuits 1, 2, 3 via an output terminal 19 to apply tracking adjustment between the tuning circuits automatically.
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