| 摘要 |
PROBLEM TO BE SOLVED: To obtain an excellent reception state by suppressing production of an undesired disturbing signal at the reception of a CATV broadcast signal with a high electric field strength through multi-channels in the electronic tuner used for a television receiver or the like. SOLUTION: A high frequency changeover switch 10 selecting a CATV broadcast signal or a ground wave broadcast signal is provided between an input terminal 1 and an input of a 1st tuning circuit 2. An attenuation circuit 11 is connected in series with an output of the CATV broadcast signal of the high frequency changeover switch 10 to connect it to an input of the 1st tuning circuit 2 and the output of the ground wave broadcast signal of the high frequency changeover switch 10 is given to the input of the 1st tuning circuit 2 directly. Thus, in the case of receiving the CATV broadcast signal, the attenuation circuit 11 is interposed between the input terminal 1 and the 1st tuning circuit 2 to suppress occurrence of distortion to decrease the level of the electric field strength.
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