| 摘要 |
PURPOSE:To optimize the reception state of an antenna without being effected of a nonlinear characteristic of a variable capacitor and the dispersion in the characteristic of the variable capacitor and a voltage controlled oscillator by selecting variable capacitors. CONSTITUTION:A variable capacitor 14 and capacitors 13,15 having a circuit constant in tuning with a radio signal of each channel to be received are provided to an antenna circuit 2 and diodes 17,18 are employed to select the relevant variable capacitor 14 and capacitors 13,15 based on a tuning control signal of a control section 4 thereby setting the antenna reception state. |
