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　　 注：(1)B132為增音機(jī)輸出與輸入端之間要求的串音衰減，一般按下式計(jì)算：

     　　                                        B132 = (50+S)dB或B132 =(5.8+S)Np��

　　     (2)在其它平行接近線路上裝設(shè)縱向扼流線圈后允許的間距x一般按下式計(jì)算：　　   

                                                   線擔(dān)，x1=0.72x

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