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根据国家无线电管理委员会一九八六年五月关于在北京市进行900兆赫5瓦发射功率分区组网试用的通知,北京市无线电管理委员会一九八六年八月指定燕山石化公司进行900兆赫无中心控制多信道共用无线电通
According to the notice of the State Radio Regulatory Commission in May 1986 on trial use of a 900-megahertz 5-watt transmit power sub-network in Beijing, the Beijing Radio Management Committee designated Yanshan Petrochemical Company in August 1986 to conduct a trial of 900 MHz Center control multi-channel shared radio