| 摘要 |
<p>A television tuner comprises a voltage controlled variable capacitance diode provided in common to the UHF band, the VHF high band and the VHF low band. A tuning voltage provided from a channel selecting apparatus is applied to the variable capacitance diode as a control voltage. A relation between the tuning voltage and the receiving frequencies is selected such that the tuning voltage of the high end channel (the maximum receivable frequency) of the UHF band is higher than the tuning voltages of the respective high end channels of the remaining bands and the tuning voltage of the low end channel (the minimum receivable frequency) of the VHF' low band is lower than the tuning voltage of the resepctive low end channels of the remaining bands. The channel selecting apparatus is adapted to restrict the upper and lower limits of the tuning voltage, whereby the upper limit of the receivable frequency of the UHF band is restricted and the lower limit of the receivable frequency of the VHF low band is restricted.</p> |
