| 摘要 |
PURPOSE:To make the effect of display excellent and to make channel selecting operation easy, by providing two voltage sources at the channel selection section. CONSTITUTION:The channel selection section 4 in which a prescribed tuning voltage is fed to the 1st local oscillator of the tuner 1, is formed with a band switching section 5 switching the reception band into 3 stages of UHF band, VHF band and VHF low band, tuning section 6 continuously selecting the frequency in the band, power supply 7 applying a prescribed voltage, and tuning voltage restriction 8 restricting the lower end of the tuning voltage. At the reception of UHF and VHF low band, the transistor 81 of a restriction section 8 for lower limit voltage is on, the variable resistor 61 is directly grounded, and the lower limit of tuning voltage is almost zero. On the other hand, in selecting the VHF high band, the transistor 81 is off and a resistor 83 is connected in series with a variable resistor 61. |
