近年来,特别是在发展中国家,迫切需要扩大其远离都市的边远地区的电话服务.在这些地区,不仅铺设电话线路需要很高的成本,线路的维护费用也较大,而且,由于地理条件的限制,在有些地方铺设工程几乎无法进行.解决这些问题的基本方法是采用无线电.但是,以前为公共通信研制的无线电设备,是使用于长途线路的多路设备,要用于偏辟地区的用户,经济上有问题.鉴于这种情况,研制了一组单路无线电设备,作为农村无线电设备,能够经济合理的广泛用于农村提供良好的电话服务. In recent years, especially in developing countries, there is an urgent need to expand telephone services in remote areas far away from metropolitan areas, where not only the telephone lines are expensive to install but also the line maintenance costs, and because of the geographical conditions The laying of construction works is almost impossible in some places.The basic solution to these problems is the use of radio.However, the radio equipment previously developed for public communications is a multi-path equipment used for long-haul routes, In view of this situation, a group of single radio devices have been developed as rural radio devices that can be economically and widely used in rural areas to provide good telephone service.