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对于架空明线在不变动现有交叉制式的某些线对上,目前能传输的信号频率可以达到530KHZ,这样一对线路复用的载波电话电路为51条电路.这51条载波电路是由4种载波设备叠加得到的.它们是2MC—302高12路载波设备(外线传输频带156～280千赫),2MC—401超24路载波设备(外线传输频带298～530千赫),加上原线路开放的12路、3路等载波设备.对于前三种高频设备在叠加后相互之间有什么影响,这也是明线高频复用所关心的问题之一.现将它们叠加后,对各个设备本身输出阻抗的影响和忙时负荷下,各个设备相互的串扰做了一定的研究和在实际线路上测试.
For the overhead line in the current cross-line does not change some of the existing cross-line pairs, the current signal frequency can be transmitted up to 530KHZ, so a pair of circuit multiplexing circuit 51 for the carrier telephone circuit.The 51 carrier circuit is composed of 4 These are 2MC-302 high 12 carrier devices (external transmission band 156 ~ 280 kHz), 2MC-401 super 24 carrier devices (external transmission band 298 ~ 530 kHz), together with the original line Open 12, 3 and other carrier devices.For the first three kinds of high-frequency equipment in the superposition after the mutual influence, which is also the line of high frequency reuse is one of the issues concerned. Now they are superimposed on each The output impedance of the device itself and the impact of busy hours under load, each device crosstalk made some research and testing on the actual line.