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2002年12月26日,成都市无线电监测站在日常监测工作中,发现在中央人民广播电台中波广播频率639kHz同时出现了两个音频信号。通过一定时间的内容辨别,判定该信号为中央人民广播电台第一套节目和四川人民广播电台节目,而且四川人民广播电台的信号远大于中央人民广播电台信号。 639kHz为中央人民广播电台专用频率。为了保障公众收听中央人民广播电
On December 26, 2002, Chengdu Radio Monitoring Station found in its routine monitoring that there were two audio signals simultaneously appearing at the Central People’s Broadcasting Station at a frequency of 639 kHz. After a certain period of time, the signal was judged as the first program of the Central People’s Broadcasting Station and the program of Sichuan People’s Broadcasting Station. Moreover, the signal of Sichuan People’s Broadcasting Station was much larger than the signal of the Central People’s Broadcasting Station. 639kHz for the Central People’s Broadcasting Station dedicated frequency. In order to protect the public listening to the Central People’s Broadcasting