| 摘要 |
PCT No. PCT/JP81/00330 Sec. 371 Date Jul. 14, 1982 Sec. 102(e) Date Jul. 14, 9182 PCT Filed Nov. 12, 1981 PCT Pub. No. WO82/01796 PCT Pub. Date May 27, 1982.A tuner used in a television receiver or the like, when one supply voltage is given as a band switching voltage from a one-circuit triple-contact switch to selectively switch a VHF low band, a VHF high-band or a UHF band, a second contact of the switch selected for setting the VHF high band is connected through a second switching diode to the node of a high-frequency grounding condenser and a first switching diode for switching a tuning coil at a VHF input tuning circuit, a third contact of the switch selected for setting the UHF band is connected to the above node through a third switching diode so as to turn on the first switching diode even when receiving the UHF band, thereby generating no harmonic wave of VHF signal from a VHF input circuit by the first switching diode and no noise in the picture and also performing the setting of other bands without hindrance. |
