以县(市)城镇为中心的有线电视网,在其经济条件、覆盖范围、服务内容、起步基础等方面与大、中城市的有线电视网相比,有许多自己的特点。一般而言,县(市)级有线网的经济条件差一些,覆盖半径小一些(平均跨距3～5公里),服务内容比较单一,而且大多数是在共用天线系统的基础上起步,起点自然就要低一些。因此在规划和建设县(市)城镇有线电视网时,不能完全照抄照搬大,中型有线网的模式,应当充 The cable television network centered on counties (cities) and towns has many characteristics of its own compared to the cable television networks of large and medium-sized cities in terms of its economic conditions, coverage, service contents and basic starting points. In general, the economic conditions at the county (city) level of cable networks are somewhat worse with a smaller coverage radius (average span of 3 to 5 km), relatively simple service content, and most of them start from the common antenna system, starting from Naturally lower. Therefore, in the planning and construction of counties (cities) and towns in the cable television network, we can not copy the model of large and medium-sized cable networks completely and should be filled