共用電視天線系統(tǒng)技術(shù)交底-北京建工集團(tuán).doc
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1 范圍
本工藝標(biāo)準(zhǔn)適用于建筑物內(nèi)接收的共用電視天線、前端設(shè)備和機(jī)房設(shè)備、傳輸分配部分及用戶終端安裝工程。
2 施工準(zhǔn)備
2.1 材料要求：
2.1.1 電視接收天線選擇要求：應(yīng)根據(jù)不同的接收頻道，場強(qiáng)，接收環(huán)境以及共用天線電視系統(tǒng)的設(shè)施規(guī)模來選擇天線，以滿足接收電視機(jī)圖像清晰，色彩鮮明的要求，并有產(chǎn)品合格證。
2.1.2 各種鐵件應(yīng)全部采用鍍鋅處理。不能鍍鋅處理時，應(yīng)進(jìn)行防腐處理。如采用8#鉛絲和鋼絲繩及各種規(guī)格的鐵管、角鋼、槽鋼、扁鐵、圓鋼、14#綁線、鋼索卡、花籃螺栓，拉環(huán)等均應(yīng)采用鍍鋅處理。各種規(guī)格的機(jī)螺絲、金屬漲管螺栓、木螺絲、墊圈、彈簧墊等應(yīng)鍍鋅。
2.1.3 用戶盒（又稱接線盒或終端盒）是系統(tǒng)與用戶電視機(jī)聯(lián)接的端口，用戶盒分為明裝和暗裝，暗裝盒又有塑料盒和鐵盒兩種，明裝一般采用塑料盒，盒子不應(yīng)有破損變形，插孔阻抗必須與電視機(jī)阻抗匹配，盒體與蓋顏色一致，并有產(chǎn)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