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The model DA-550BID bi-directional RF distribution amplifier with 12-volt IR is the heart of a multi-room distribution system with outputs to eight Televisions with coax runs up to 150 feet. The model DA-550BID has three inputs, one from CATV and two from channel plus 5400, 5500, or svm Series modulators. Can handle an extremely wide range of input signals from NTSC and digital TV and offers a 5-42 MHz bandwidth Return path for bi-directional communication for use with digital cable interactive set-top boxes.