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随着我国广播电视事业的不断发展,各个电视台节目和频道数的不断增加,如果播出每套节目的发射机都安装一副天线,那么天线和馈线的投资会大幅度增加而铁塔也要有足够的空间来放置天线,显然这样很不经济也不大可能,为了解决这一问题,采用了多个不同频道节目使用一副天线的方法,将多个不同频道节目合成后使用一副天线的设备,我们称之为多工器。多工器是一种使不同频道节目的多部发射用同一副宽频带天线,同时互不干扰地发送各自节目的技术设备。它位于几部发射机和一副宽频带天线之间,一般是直接连接在发射机的后面。
With the continuous development of the radio and television industry in our country, the number of programs and channels of various television stations is constantly increasing. If an antenna is installed on the transmitters of each program, the investment in antennas and feeders will increase substantially while the tower also has Enough space to place the antenna, apparently so uneconomical is not possible, in order to solve this problem, the use of a number of different channel programs using an antenna method, a number of different channels after the synthesis of an antenna using the program Equipment, we call it multiplexer. A multiplexer is a technical device that enables multiple transmissions of different channel programs to be broadcast on the same pair of wideband antennas while transmitting their respective programs without disturbing each other. It is located between several transmitters and a broadband antenna, usually directly connected to the rear of the transmitter.