黄委会已拥有M753超短波三路接力机五十余部,加上其它种类的小型接力机上百部,分布在全河上下作为防汛报汛和抢险用。几年来普遍反应使用不方便,其一,须有可靠的电源;其二,操作人员须经专门培训;其三,接入总机易出现长振铃。 The Yellow Commission already has M753 ultrashort wave three relay 50, plus hundreds of other types of small relay, distributed throughout the river as a flood control and rescue purposes. In recent years, the general reaction inconvenient to use, one, there must be a reliable power supply; Second, the operator must be specially trained; Third, there is a long ring prone access switchboard.