| 摘要 |
<p>PURPOSE:To ensure the wind noise preventive effect of the title electric wire while its AN characteristics are sharply improved by forming narrow gaps on the outer periphery of the core member of a spiral rod so that a strand having an outside diameter smaller than that of the spiral rod can be wound in advance around the core member along the gaps. CONSTITUTION:When a spiral rod 2 is wound around a transmission line 1, the rod corresponding to the conventional spiral rod 2 is formed of a core member 2a and narrow gaps 4 are formed on the outer periphery of the member 2a. Then a strand 3 having an outside diameter d1 which is smaller than the outside diameter d2 of the member 2a is wound around the member 2a along the gaps 4 in advance so that a composite cable body can be formed. Moreover, a relation, 2d1 d2, is set between the outside diameter d1 of the strand 3 and that d2 of the member 2a. Therefore, water drops do not grow large, but fall down quickly and the audible noise(AN) characteristics of the transmission line 1 can be improved sharply.</p> |
