查人人中国名人网南昌航空大学软件学院:英语翻译 准确好！！
来源：百度文库 编辑：查人人中国名人网 时间：2024/05/09 08:09:39
At this writing,the most popular digital direct-to-home television system is the Digital Satellite System(DSS)(a trademark of Hughes Communications).It uses an 18'' diameter dish antenna to receive signals from six satellites,all operating in the Ku-band.A typical DSS receiver and antenna are pictured in Figure 20.18.The antenna has a gain of about 34 dBi and a beamwidth of approximately 3.50.It uses an offset feed(馈入补偿). Though it does not appear so,the feedhorn is at the focus of the antenna,which is a section of a larger paraboloid.Installation is very simple,since the antenna does not need to rotate.The approximate azimuth and elevation angles for the dish can be read from a program built into the receiver once the receiver location is entered.Fine adjustments can be made by using the receiver to monitor signal strength as the antenna is moved.
在记者发稿时止,最热门的数码家庭直播卫星电视系统的数字化系统(直资)(休斯通讯的商标).
它采用了18 ' ' 直径天线接收天线由6颗卫星的信号,所有的波段操作,直接资助Band.a典型接收天线,有图利市20.18.the天线已经获得了约34DBI和beamwidth约3.50.it抵消饲料使用. 虽然它似乎没有做,Feedhorn处于天线的焦点,这是第一个较大paraboloid. 安装很简单,因为不需要天线轮换. 大致方位和角度的提升可以读出碟计划进接收机接收地点一旦进入. 调整优秀的可利用接收信号强度监测天线是感动.
再这写作,最流行的数传直接的-到-家电视系统是数传人造宇宙站系统 (DSS)(一个修沟通的商标).它使用一 18'' 直径盘子天线受到来自六座人造宇宙站的信号,全部在 Ku 中操作-乐团。一个典型的 DSS 接收器和天线在图 20.18 被画。天线有一个大约 34 dBi 的增益和 beamwidth 大约 3.50.它使用抵销饲养(馈入补偿). 虽然它不这么出现，但是 feedhorn 在天线的焦点, 是较大的抛物面的一个区段。安装非常简单,因为天线不需要替换。给盘子的大约方位和海拔角度能从一经接收器位置被进入进入接收器之内被建造的一个计画被读。当天线被移动的时候，罚款调整能被藉由使用接收器检测信号力量做