[問題] 第四台的同軸電纜線之正負極
因為想在房間用電腦看電視, 所以上網找電視盒&傳輸線材的資料.
看網路相關資料,我對線材的理解如下↓
「剝開常見的第四台電纜線, 其核心導線為正極, 同軸(與導線間有絕緣)之鋁箔為負極」
而有人推薦第四台可使用「CommScope F59 HEC-2」這條線.
但...我發現此線「CommScope F59 HEC-2」內部竟有"雙層鋁箔"(兩層之間也有絕緣!..)
這樣我太不知道要怎麼處理(因為我要弄接頭), 它為什麼會有"雙層鋁箔"呢??
請不吝指導, 謝謝!!~
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再感謝!
剛剛在繼續看相關的網頁,
http://www.phy.ntnu.edu.tw/demolab/phpBB/viewtopic.php?topic=18207
師大黃福坤老師提到幾個相關的概念
「封閉金屬容器 有隔絕電磁場從外界進入的效果
但是對於內部往外的電磁波 並沒有隔離效果 因為金屬表面會隨著產生感應電荷
建立同樣的電磁場」
「唯一有效防止電磁波外洩的方式是 外面的金屬要接地
例如同軸電纜線就是靠外界的金屬接地 將訊號限制在內部.」
「同軸電纜中心並不帶電 因此並不會產生電場
又中心電流方向和外圈電流方向相反 因此 在電纜外的磁場相互抵銷!」
從上面看起來, 有關接地的部份, 似乎是不讓電磁波跑出去,
但我覺得這種第四台用的傳輸纜線,
若有改良, 應該是比較在乎自身的訊號有無衰減,
而不是在乎自己的訊號有無跑出去影響到別的電子產品.....
還是說, 「減少自身產生到外界的電磁波, 也能減少訊號衰減」呢?
但, 同軸電纜本身並不會產生電磁波不是嗎?
(因為根據上述, 電纜內外電流相反, 所以感應磁場抵銷)
※ 編輯: kiesoIFRS (36.227.168.111), 02/22/2015 22:08:36
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