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发明公开
CN101951240A 接收调谐器 无效 - 撤回

接收调谐器
摘要：
本发明提供一种接收调谐器，在从VHF高波段的低频波道到中频波道的接收时不会降低选择性、在VHF高波段的高频波道的接收时能够提高抗干扰性。采用下述结构，具有：与输入端子(21)连接的VHF输入线路(3)和UHF输入线路(4)，设置在UHF输入线路(4)中的开关二极管(D1)，与开关二极管D1并联连接的电容器C2，连接在开关二极管D1的阴极与电容器C2的连接点上、电容值比电容器C2大的电容器C1，连接在电容器C1上、设置在UHF输入线路(4)与接地之间的电感线圈L1；在VHF高波段的高频波道的接收时使开关二极管D1导通，从而对VHF高波段的高频波道衰减低频端的信号。
摘要（英）：

The invention provides a reception tuner, which will not reduce selectivity when receiving the low frequency wave channel of VHF high wave band to the middle frequency wave channel of VHF high wave band, and is capable of improving anti interference when receiving the high frequency wave channel of VHF high wave band. The reception tuner comprises a VHF input line (3) and a UHF input line (4) connected to an input terminal (21), a switch diode (D1) disposed in the UHF input line (4), a capacitor (C2) which is in a parallel connection with the switch diode (D1), a capacitor (C1) which is connected to a junction between the cathode of the switch diode (D1) and the capacitor (C2) and is larger in capacitance than the capacitor (C2), and an inductance coil (L1) disposed between the UHF input line (4) and the grounding. When the high frequency wave channel of the VHF high wave band is received, the switch diode (D1) is conducted, and the signal of low frequency end on the high frequency wave channel of the VHF high wave band is reduced.

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