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当前省内载波通信还主要依靠明线载波电路,提高明线线路复用率是解决省内通信电路紧张问题的有效办法。我所先后研制了明线高十二路,明线超廿四路以及明线超十二路载波设备,工作频率从156kHz直至530kHz,大大展宽了明线的使用频段,可以充分挖掘明线线路的潜力。但是作为关键部件之一的线路放大器,这几种设备是互不相同的,不能互换,为此我们研制了明线156—530kHz线路放大器,它的工作频带从156kHz至530kHz,包括了以上几种设备的工作频带,可以直接作为其中任何一种设备的线路放大器使用,给生产和维护带来很大方便。
Currently, the carrier communication in the province also relies mainly on the clear-line carrier circuit. Improving the multiplexing rate of the open-circuit lines is an effective solution to the problem of tension in the communication circuits in the province. We have successively developed the Mingdu high 12nd, Mingxian 24th and Mingxing 12th channel carrier devices. The working frequency is from 156kHz to 530kHz, which greatly widens the use frequency of the bright line and fully tap the potential of the bright line. However, as one of the key components of the line amplifier, these devices are different from each other, not interchangeable, for which we have developed a line 156-530kHz line amplifier, which operates from 156kHz to 530kHz band, including the above The working frequency band of the apparatus can be directly used as the line amplifier of any one of them, which brings great convenience to production and maintenance.