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自81年7月1日起,BPM短波授时台已正式承担我国准标时间、准标频率的发播任务。但至今BPM发播的时间信号只给出了秒信号的起始时刻,而没有给出这个时刻的绝对时间,从这种信号里无法辨别某一秒是何年、何月、何日、何时、何分、何秒,而且在现用发播程式中还不是每秒都有信号,程式以半小时为一周期,其中包括BPM呼号,UTC时号,UTI时号以及无调制载波信号,所以即便是秒信号,标准也不一致,有UTC也有UTI。
Since July 1, 2001, the BPM short-wave timing station has formally undertaken the broadcasting task of China’s quasi-standard time and quasi-standard frequency. But so far BPM broadcast time signal only gives the start time of the second signal, but did not give the absolute time of this moment, from this signal can not tell a second what year, what month, what day, what Hour, second, and second, and in the active broadcasting program, there is not a signal every second. The program takes half an hour as a period, including BPM call sign, UTC time number, UTI time number and unmodulated carrier signal, So even the second signal, the standard is inconsistent, UTC also has UTI.