弱电初学者
发表于 2008-6-20 17:53:45
有线电视系统(CATV)设计教学(含习题、答案)
<h1 style="MARGIN: 17pt 0cm 16.5pt; TEXT-INDENT: 0cm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有线电视系统(CATV)设计习题</span></h1><h4 style="MARGIN: 6pt 0cm"><span lang=EN-US><font face=Arial>1.</font></span><span style="FONT-FAMILY: 黑体; mso-ascii-font-family: Arial">填空题</span></h4><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)一个完整的有线电视网络应由</span><u><span lang=EN-US><font face="Times New Roman"><span style="mso-spacerun: yes"> </span><span style="mso-spacerun: yes"> </span></font></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">三个部分组成。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">2</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)前端系统采用的设备是天线放大器、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、解调器、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、滤波器等。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">3</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)主干传输系统采用的主要设备是</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">,主要实现信号的放大功能。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">4</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)主干线传输系统一般采用</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">四种方式进行信号的传输。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">5</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)用户分配网络系统采用的设备主要有:</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">6</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)在选择分支器时,必须确保与分支器端接的电视机的输入电平可控制在</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之间。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">7</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)对于小型有线电视网络可以考虑采用</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输技术,对于线缆无法敷设且地形较开阔的有线电视组网场合可以选用</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输技术,对于大型或超大型有线电视组网场合可以选用</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或</span><u><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman"> </font></span></span></u><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输技术。</span></font></p><h4 style="MARGIN: 6pt 0cm"><span lang=EN-US><font face=Arial>2.</font></span><span style="FONT-FAMILY: 黑体; mso-ascii-font-family: Arial">问答题</span></h4><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)请简述目前常用的有线电视传输技术的特点。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">2</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)请简述在用户分配网络中分配器与分支器设备的区别。</span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">(</span><span lang=EN-US><font face="Times New Roman">3</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">)请简述</span><span lang=EN-US><font face="Times New Roman">HFC</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">传输系统的组成部分及系统主要的设备。</span></font></p><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><p><hr width="100%" color=#000000 SIZE=1 /></p><p><font color=#ff0000>习题参考答案 [答案是本人填写,不一定正确,仅供参考]</font></p><p>1 前端系统、干线传输系统和用户分配网络。</p><p>2 天线放大器,调制器、解调器、混合器、滤波器等设备</p><p>3 干线放大器</p><p>4 室外同轴电缆、光缆、多路微波MMDS、HFC(同轴电缆和光缆混合)</p><p>5 分配器和分支器</p><p>6 60~80dBmV之间</p><p>7 同轴电缆传输技术 多路微波MMDS技术 光缆或HFC传输技术</p><p>8 分配器的主要技术指标是分配损失、分配隔离度及驻波比。</p><p>9 分支器的主要技术指标有插入损耗、分支损耗、分支隔离度、驻波比及反向隔离度。</p><p><font color=#ff0000>此习题教材下载地址:</font><a target=_blank href="http://www.rdzjw.com/download/list.asp?id=1705"><font color=#ff0000>http://www.rdzjw.com/download/list.asp?id=1705</font></a></p></span></font>
yezi8288
发表于 2008-6-30 12:43:56
谢谢
njpla
发表于 2008-7-1 10:00:12
<p>好东西,到时给人培训用</p>
ebispace
发表于 2008-7-1 13:51:00
好东西呀,顶一下了1
唐新
发表于 2008-7-2 23:40:05
值得学习
457858533
发表于 2008-7-5 15:12:30
电工群,26529527有时间进来交流交流
omf
发表于 2008-7-5 19:45:38
谢谢
pupu913
发表于 2008-7-8 00:01:23
顶
真的很有用的哈
eshow115
发表于 2008-7-8 09:44:32
<p>怎么加不进去,,QQ23671374</p>
eshow115
发表于 2008-7-8 11:18:32
好东西,,在家一起分享呀,,学习中。