电缆对号器的改进黑龙江省绥化线务局赵伟北京生产的电缆对号器，以机械振荡做信号源极易停振，工作噪声很大音色差而且不易调整。为了克服这些缺点，我将机械振荡改用晶体三极管作振荡源。改装后用在市话电缆线路工程，经过两年试用受到了电缆员的欢迎。一、电路原理（图... Improvement of the cable browser Heilongjiang Province Suihua Line Zhao Wei Beijing production of the cable device, the source of mechanical oscillations easy to stop vibration source, the working noise is very large tonal and difficult to adjust. In order to overcome these shortcomings, I use the crystal oscillator as the oscillation source instead of the mechanical oscillation. After the conversion used in the local telephone cable project, after two years of trial by cable crew welcome. First, the circuit principle (Figure