时间是测定地震参数的一个很重要的量.时间服务的精度直接影响着资料的实用价值,但近年来代县台对时精度可以说是相当低的.代县台群山环绕,再加上无线电发射干扰,对时相当困难,尤其是冬季天黑得早,对时就更困难,嗓音大,讯号弱,BPM的发射讯号几乎全部被淹没.改用其它波段也无济于事.为了改变这种情况,我们首先对收音机各级的灵敏度进行了测试,然后用短波室外环状天线代替 Time is a very important measure of seismic parameters.The precision of time service directly affects the practical value of the data, but in recent years the accuracy of the time on behalf of the county and county can be quite low. Radio transmission interference, very difficult to match, especially in the winter dark early, when the more difficult, the voice is loud, the signal is weak, BPM almost entirely submerged launch signal. Switching to other bands also does not help. In order to change this situation , We first test the sensitivity of the radio at all levels, and then use the shortwave outdoor loop antenna instead