| 摘要 |
PURPOSE:To obtain a pattern without picture quality deterioration by changing the 2nd local oscillation frequency when a beat component is generated by harmonics of the 1st local oscillation frequency and the 2nd local oscillation frequency. CONSTITUTION:A channel information terminal 14 receiving channel information or band information and a switching diode 15 to change an oscillation frequency in the 2nd local oscillator 8 are provided. In receiving a channel causing beat disturbance, a constant voltage is fed to the terminal 14 to turn on the switching diode 15, a pad 17 goes to an equi-potential with the ground potential, the tip capacitance of a resonance line 23 is changed to change the oscillating frequency. Thus, the frequency is changed by the normal oscillation frequency at a channel causing beat and the relation of frequencies not causing the beat is obtained.
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