推荐回答(3个)
中星九号卫星接收器怎么搜台?1 、方位角:通常我们通过计算软件或在资料中得到的结果应该是以正南方向为标准,将卫星天线的指向偏东或偏西调整一个角度,该角度即是所谓的方位角。至于到底是偏东还是偏西,取决于接收地与欲接收卫星之间的经度关系,以我们所在的北半球为例,若接收地经度大于欲接收卫星经度,则方位角应向南偏西转过某个角度;反之,则应向东转过某个角度。正南方向用指南针来测定,但是由于地理南极和地磁场南极并非完全重合,所以选好方位角之后还得做一些修正才有可能接收到最强的卫星信号。中星9号的方位角大约是在南偏西的位置
2、仰角:是天线轴线与水平面之间的夹角。正馈天线的轴线很明确,是高频头所在位置与天线中心的连线;偏馈天线的轴线就没那么明确了,包括原来装大锅的人都以为KU天线的仰角和大锅一样对天。实际上KU天线的仰角比大锅要低很多,这就是很多人都调不出信号的主要原因!请参考以下具体图案:
请注意,卫星信号实际在KU天线上方有个反射后再进入高频头接收的。很明显卫星信号的入射角在KU天线的斜上方,并不是与锅面垂直的正前方!KU天线的实际仰角和大锅相比要减去24.6左右度的偏馈角。如果大锅的仰角是55度的话,用KU天线收同一个卫星,KU的实际安装仰角为55减去24.6度。不同KU天线厂家的偏馈角都有所不同。中卫系列的为24.6度左右。下面再给个实际中9卫星天线安装照片。大家看到如果是按照大锅的安装仰角来看。天线对面的房子肯定遮住了信号。但是KU天线就不一样的,信号是从2栋房子间射到KU天线上方再反射到高频头接收的
3、极化角; 中星9号由于是采用园极化接收,所以高频头的旋转位置就不需要做任何调节。想将F头朝哪个方向都行。决定园极化方向是由高频头波导管内的极化片插入方向决定。下面给张左旋极化的高频头内部照片给大家参考。
4,调星过程: 将天线安装好,用同轴线将高频头和接收机连接好后,按遥控菜单,输入密码1234或9999进入系统设置。选择安装与信号检测一项。再按一下确认,然后再按一下确认键出现信号强度和信号质量。如果同轴连线没问题的话信号强度显示30-70以上,并且有红色进度条。(早期有部分机器无强度显示或数字从0-70跳动,只要将接高频头的F头碰一下铜芯,如果接收机断电保护则可以证明连线没问题)。信号质量为0.计算好当地的仰角和方位角度,参考以上照片初步定好天线仰角。微调天线方位角度。这个过程要有耐心,移动的速度越慢越好。尤其是新手。如果对准了卫星信号质量马上有显示。并且颜色从红色变成绿色就行了。最后将信号质量调到最高就OK了。
5,平板天线的安装。由于平板天线不存在偏馈角,所以安装的仰角以查询程序计算出的仰角为准。不需要减去二十几度的偏馈角度。----友情链接
中星9号专用机必须采用10750圆极化KU高频头,因此在安装过程中同以往圆极化卫星有所不同,可不用理会极化角的问题。安装好KU天线,接上高频头信号线,稍微调整天线的方位角和仰角,便很容易找到92.2°E的中星9号卫星,使用该机的自动搜索功能扫描完该星的4组转发器的时间还不到30秒,自动搜索完毕后会以醒目的黄色颜色提示本次共搜索到(目前)44套电视节目和43套广播节目,几秒后可自动消失。
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