| 摘要 |
PURPOSE:To eliminate an influence of spurious disturbance by providing a VHF television tuner that covers the FM band and by interposing a narrow-band tuning circuit between this tuner and a television antenna. CONSTITUTION:VHF television tuner 1 is provided which has its band widened to cover the FM band and to input terminal 2 of VHF television tuner 1, traveling terminal 3a of change-over swtich 3 is connected. The output terminal of television antenna 4, on the other hand, is connected to traveling terminal 5a of change-over switch 5. Then, fixed terminal 5b of this change-over switch 5 is connected to fixed terminal 3b of change-over switch 3. Further, tuning circuit 6 of narrow-band characteristics is connected between fixed terminal 5c of change-over switch 5and fixed terminal 3c of change-over switch 3. Varactor diode 6a of this tuning circuit 6 is applied with a tuning voltage, to be applied to the varactor diode of tuner 1, from terminal 7. |
