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Attenuator is within the specified range of frequencies and decay of a used for introducing a predetermined circuit. General introduction of decibels of attenuation and impedance in ohms to indicate. In the cable television system widely used multi-port attenuator in order to meet the level requirements. Amplifier input end, output level control, branching attenuation control. Passive attenuators and attenuator active attenuator in two ways. Active attenuator dovetail with other heat sensitive components that make up a variable attenuator and apparatus for automatic gain slope control or in the amplifier circuit. Passive attenuator has fixed attenuator and variable attenuator.