共用电视天线系统技术交底-北京建工集团.doc

 1  范围
    本工艺标准适用于建筑物内接收的共用电视天线、前端设备和机房设备、传输分配部分及用户终端安装工程。
    2  施工准备
    2.1  材料要求：
    2.1.1  电视接收天线选择要求：应根据不同的接收频道，场强，接收环境以及共用天线电视系统的设施规模来选择天线，以满足接收电视机图像清晰，色彩鲜明的要求，并有产品合格证。
    2.1.2  各种铁件应全部采用镀锌处理。不能镀锌处理时，应进行防腐处理。如采用8#铅丝和钢丝绳及各种规格的铁管、角钢、槽钢、扁铁、圆钢、14#绑线、钢索卡、花篮螺栓，拉环等均应采用镀锌处理。各种规格的机螺丝、金属涨管螺栓、木螺丝、垫圈、弹簧垫等应镀锌。
    2.1.3  用户盒（又称接线盒或终端盒）是系统与用户电视机联接的端口，用户盒分为明装和暗装，暗装盒又有塑料盒和铁盒两种，明装一般采用塑料盒，盒子不应有破损变形，插孔阻抗必须与电视机阻抗匹配，盒体与盖颜色一致，并有产品合
1 Scope
    This technology is applicable to building a shared TV antenna reception, front-end equipment and engine room equipment, transmission and distribution part of the user terminal installation.
    2 construction preparation
    2.1 Material Requirements:
    2.1.1 TV receiver antenna selection requirements: should be based on the different receiver channels, field strength, the receiving environment and community antenna television system to select the antenna the size of facilities to meet to receive TV pictures are clear, bright requirements and have qualified products card.
    2.1.2 should be used in all the various pieces of galvanized iron treatment. Can not be galvanized should be embalmed. Such as wire and wire rope with 8 # and all kinds of steel pipes, angle steel, channel steel, flat iron, round bar, 14 # binding wire, steel Soca, basket bolts, pull ring should be used galvanized. All kinds of machine screws, metal expander bolts, wood screws, washers, spring washer, etc. shall be galvanized.
    2.1.3 User box (also known as junction boxes or terminal box) is a system with the user port connected TV, the user is divided into clear boxes installed and concealed, dark boxing there are two kinds of plastic boxes and tin, out for ordinary plastic box, the box should not have broken deformation, jack impedance of impedance matching with the TV set, box and lid color, line, and a product co