有线电视分支分配器件的扩频性能测评

Test&Evaluation of the Extended Spectrum Performance of CATV Branch Distributor

目前有线电视同轴系统中所使用的分支分配器件大都是1 GHz的产品。鉴于越来越多的业务需要承载,有线电视的同轴系统扩频的需求也越来越迫切。抽测了一部分市面上常见的1 GHz分支分配器,对其>1 GHz的频段的可用性进行了分析、评估。结果显示,市面上常见的分支分配器基本上可以扩展到1.2 GHz的信号传输。此外还对市面上一种新型的2.4 GHz分配器进行了测试,结果表明在2 GHz的范围内,该新型分配器具备良好的频率响应。

At present,most of the branch distributors used in existing coaxial cable TV systems are 1 GHz products.In view of more and more services&contents need to carry,the spectrum of the coaxial system of cable TV is required to be extended urgently.In this paper,some samples of 1 GHz coax passives in the market have been tested and evaluated in term of the usability for>1 GHz band.The results show that the common used branch distributors in the existing cable TV network can basically be extended to 1.2 GHz for new signals transmission.Besides,a new type of 2.4 GHz splitters has also been tested,and the results show that it has good frequency response up to 2 GHz.