| 摘要 |
PROBLEM TO BE SOLVED: To prevent an interference between adjacent channels by controlling signal attenuation of a desired channel in a system installation and a system operation. SOLUTION: Attenuators corresponding to a channel of a disturbing wave are activated among attenuators 61 to 6n provided to reception antennas 11 to 1n for receiving the channel of the disturbing wave and among attenuators 71 to 7n provided in a high frequency mixing distributor 2 on the basis of a control signal transmitted from a control unit 9. Functions of line compensators 81, 82 provided onto a coaxial cable of the channel are stopped on the basis of the control signal transmitted from the control unit 9. Thus, an output level can be decreased by reduction in the functions of the line compensators in addition to application of the attenuators. Since a limiter amplifier 204 for interrupting a subcarrier and squelch circuits 101 to 10m are provided to receivers 31 to 3m so as to prevent a noise caused by the subcarrier of the disturbing wave from being output. COPYRIGHT: (C)2008,JPO&INPIT
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