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onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-17561.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=17561&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <div id="fj" class="y"> <label class="z">电梯直达</label> <input type="text" class="px p_fre z" size="2" onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=29994&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-29994-1-1.html" id="postnum223315" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon223315" src="static/image/common/online_member.gif" /> <em id="authorposton223315">发表于 2005-1-1 22:41:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=29994&page=1&authorid=17561" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=29994&extra=page%3D1&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 223315);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_223315"> <P>１.９ＭＨＺ</P> <P>这个频段是允许业余电台使用的唯一中频(MF)频段。这个频段的DX需要在夜间传 送电波，特别是当<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>双方都处于日出日落的时间带时，其通信状态是最好的。白昼和黑夜的交替时间形成的通道称为“灰线”通道，但它出现的概率不高，持续时间也短。1.9MHz的小频段只有从1.9075MHz到l.9125MHz的5kHz的宽度，是CW的专用。在频段的使用上，DX QSO习惯使用的频率主要在1.805MHz、1.825MHz和1.910MHz附近。因此，有时要采用在1.805MHz附近接收，在1.910MHz附近发送的异频收发方法(在1.805/1.825MHz附近的频率在日本不能使用。这一频段的波长较长，为160m左右，很难架设满足需要的天线。缩短的偶极子天线和垂直天线可以说是比较实用的天线。另外，由于电离层的衰耗比较大，在进行DX通信时需要一定的功率。</P> <P>３.５－－３.８ＭＨＺ</P> <P>在日本，把从3.500MHz到3.575MHz的75kHz称为3.5MHz频段；把从3.791MHz到3.805MHz的14kHz称为3.8MHz波段，而在国际上则把它们看作是一个频段。电波的传输方式与1.9MHz频段相似，白天的接收仅限于近距离电台。远距离电台则要在夜间才能联络，特别是在日出日落的时间带内效果较好。此外，这两个波段在夜间比l.9MHz效果好，但是对远距离电台的联通概率较低，联通时间也较短。这两个频段在11月-1月的冬季效果最好，可全球联络。日本国内的QSO对CW/SSB都使用3.5MHz频段。海外电台则对CW使用3.5MHz，对SSB使用3.8MHz段。由于3．8MHz频段只有14kHz的频宽，在使用上要特别注意。有的电台使用二单元或三单元的定向天线，但大多数电台则使用偶极子天线、垂直天 线等天线。</P></td></tr></table> </div> <div id="comment_223315" class="cm"> </div> <div id="post_rate_div_223315"></div> </div> </div> </td></tr> <tr><td 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