概况广播电台的节目声源(录音磁带)和发射机之间,必须有一个“音周切换箱”.其功能是,根据节目时间表把相应声源转接到相应发射机;此外,发射机和天线群之间还有一个“天线切换箱”(见图1).目前,国内大多数电台的音周和天线切换是靠手扳开关实现的,工作繁琐、精神紧张,错切事故很难避免;有的电台采用标准电子钟外加译码矩阵进行定时自动切换,但由于是组合硬件逻辑,灵活性低,节目时间表变更时需改接矩阵二极管,比较麻烦;其次,不能自己检查切换的正确性,仍须值班员随时监视,因此未获普遍推广.少数电台曾采用8位单板机控制音周切换,但由于技 Overview There must be a “sound box” between the program’s source (tape) on the radio station and the transmitter, with the function of transferring the corresponding sound source to the corresponding transmitter according to the schedule of the program; in addition, There is also an “antenna switching box” between the transmitter and the antenna group (see Figure 1) .At present, the sound week and the antenna switching of most domestic stations rely on the switch to switch to achieve the tedious work, mental stress, wrong cut Accident is difficult to avoid; some stations using standard electronic clock plus decoding matrix timing automatic switching, but because of the combination of hardware logic, low flexibility, change the program schedule to change the matrix diode, more trouble; and second, can not own Check the correctness of the switch, the watchman still need to monitor at any time, it has not been widely promoted. A few stations have used 8 single-board control sound per week switch, but because of technology