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驻波比检测电路是保护中波、调频或电视等各种发射机不被外界突发或渐变故障损坏的一个重要屏障。因此,这一电路自身工作状态的稳定与否对整个发射机的安全运行至关重要。为了保证驻波比检测电路能够正常发挥安全保障功能,中波数字调幅发射机在每次开机运行时都要对该电路进行一次自身检测,以确定它是否正常。我台的3部数字发射机经过6年的使用和对其原理的分析,我们发现如果对驻波比自测电路做进一步的改进,发射机受到的保护会更加完善和有力。
Standing wave detection circuit is to protect the wave, FM or television and other transmitters are not outside sudden or gradual failure of an important barrier damage. Therefore, the stability of the working state of the circuit itself is crucial to the safe operation of the entire transmitter. In order to ensure that the SWB detection circuit can function normally, the AM digital transmitter needs to perform a self-check on the circuit every time it is powered on to determine whether it is normal or not. After six years of using and analyzing the principle of three digital transmitters in our station, we found that if the VSWR self-test circuit is further improved, the transmitter protection will be more perfect and powerful.