| 摘要 |
<p>PURPOSE:To reduce wind noises and an audible noise level by making the state of the winding of a spiral rod differ in conductors in parallel array and a single conductor. CONSTITUTION:The element conductors 1 of a multiple-conductor transmission line composed of a plurality of the element conductors 1 winding a spiral rod 2 are arranged in positional relationship, in which there are pairs of the conductors in the direction approximately parallel with the direction V of a wind and there are single conductors at locations crossed at right angles with the pairs of the conductors, in the array of the element conductors 1, and the state of the winding of the spiral rod 2 is made to differ in the conductors in parallel array and the single conductors. That is, when one parts of the element conductors 1 are disposed as the single conductors, a wind sound is reduced maximally though the number of the winding of the spiral rod 2 is decreased in the single conductor sections, and an AN (an audible noise) level can be suppressed within a comparatively small range even in the winding mode of such a spiral rod.</p> |
