目前要用一种频率或一种通讯方法完成井下通讯的任务是不可能的,只有在一个矿井内同时采用多种通讯装置,才能取长补短,建立合理的通讯系统,如英国贝沃考茨煤矿,采用125门自动电话供井上下联系用,在全矿井下设有感应式呼叫系统(频率35千赫,共50台便携式接收机与地 At present, it is impossible to accomplish the task of downhole communication by using a frequency or a communication method. Only by using a plurality of communication devices in a mine at the same time can we learn from each other to establish a reasonable communication system. For example, The use of 125 automatic telephone for up and down contact with the whole mine with an inductive call system (frequency 35 kHz, a total of 50 portable receivers and ground