同軸放大器存在哪些缺點

详情描述：

同軸電纜是指有兩個同心導體，而導體和屏蔽層又共用同一軸心的電纜。在實際工程中，同軸放大器對視頻信號具有一定的放大，並通過均衡調整對不同頻率成分分別進行不同大小的補償，使接收端輸出的視頻信號視頻失真盡量小。
但同軸放大器並不能無限制級聯，一般在一個點到點系統中同軸放大器多只能級聯2-3個，否則無法保證傳輸質量，調整也相對有難度。因此為了保證視頻圖像的質量，傳輸距離範圍限制在400-500米左右。
此外，同軸放大器還存在以下的缺點：
1)同軸電纜本身受氣候變化影響大，圖象質量受到一定影響;
2)同軸電纜較粗，在密集監控應用時布線不太方便;
3)同軸電纜一般只能傳視頻信號，如果系統中需要同時傳輸控制數據、音頻等信號時，則需要另外布線;
4)同軸電纜抗干擾能力有限，無法應用於強干擾環境;
5)同軸放大器還存在着調整困難的缺點。
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