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<P>7.000—7.100MHz的100kHz频带属于7MHz频段。这一频段日本国内的QSO而非常拥挤，在夜间DXer们也很热闹。电波的传输方式基本上与1.9MHz和3.5/3.8MHz频段具有相似的特性，但DX的开通概率较高，开通时间也较长。特别是早晨和黄昏的时间对国内的QSO是最合适的，可进行日本全国的QSO，因此日文CW的使用也很盛行。很多电台在狭窄的波段内相互 拥挤，使人想到了上下班时的交通高峰。此外，早晨和黄昏的时间也是DX电台开通的好机会。一年之中，几乎没有不能开通DX的日子。从傍晚到深夜可收到北美、南美方面的信号，从深夜到黎明则可收到来自欧洲和非洲的信号。整个夜晚都可收到大洋洲的信号。从季节上看，从春季到秋季都是进行DX的最佳季节。这个频段所使用的天线一般以偶极子、倒V形天线以及垂直天线为主，但使用二单元、三单元的旋转定向天线的电台也不少。</P> <P>１０ＭＨＺ</P> <P>本频段是日本在1982年4月开放的，是HF波中历史较短的业余频段。在HF波中这个频段附近的电波特性比较稳定，并且较适于海外<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>，所以多用于商业电台。这个频段处于DX主要使用的7MHz和14MHz频段之间，一年四季都可进行全球通信。这个频带宽度为从10.100MHz到10.150MHz的50kHz，由于频带比较狭窄，是国际的CW专用频段，不能用SSB方式。此波段一般不用于竞赛，DX远征也不可以使用。因此此波段比较空闲，能够很清晰地收听到DX之间CW的对话信号。也许是这个频段在世界上的利用率不高，使用定向天线的电台很少，几乎都是使用偶极子或垂直天线。而且这个频段只有持有一级、二级执照的业余电台才能使用。</P> <P>从14.000MHz到14.350MHz属于14MHz频段。不用说，此频段作为DX的主要频段也是很有名的。本频段的特征是由于太阳活动和季节的变化对通信有些影响，但可进行全球通信。 本频段是世界范围的DX频段，所以在使用上大多电台都是以进行DX QSO为目的，几乎可以所有的DX远征都要使用这一频段。因此与其它频段相比，日本国内的QS0不太活泼。14MHz电波的波长是20m，比较容易架设天线。由于进行DX的电台较多，所以大多使用定向天线。本频段只限于一级、二级业余电台使用</P> <P>从18.068MHz到18.168MHz的100kHz属于18MHz段。本段和10MHz、24MHz频段一起由WARC-79(世界无线电行政大会)规定准许供业余业务使用，日本从1989年7月1日开始允许业余电台使用。本频段具有后述的2lMHz频段和前面的14MHz频段的中间特性，只限于一级、二级和三级业余电台使用。</P> <P> 从21.OOOMHz到21.450的450kHz是21MHz频段。这个波段对于DX电台并不是随时可用的，但在不同的时间和季节能够分别适合于国内QSO和DXQSO。在太阳活动的高潮期，21MHz波段是DX联络的主要频段。只要条件允许，以较小功率也能体会到DXQSO的乐趣。由于本频 段频带较宽，天线尺寸又较小，所以成为HF的入门频段。太阳活动对这个频段的电波传输有很大影响，太阳黑子的相对数量(SSN)成为予测这一影响的基准。如果SSN的月平均数超过100以上，就很容易进行全球的DX。在太阳活动低潮时，虽然DX QSO不是完全不可能的，但日本与美国东海岸和英国以及欧洲纵深地区的QSO非常困难。DX的盛行期是春、秋两季，大致从早晨到中午从日本对北美和南美方面、下午对亚洲和大洋洲方面、夜间对欧洲和非洲方面信号比较强。每年的五月到八月，突发E电离层(Es)发生频度较高，国内QSO比较容易进行。这一期间是国内不同地区的电台之间通信的好机会。而在其它季节，主要依靠地面波进行QSO，通常最大联络范围只有50-100Km。由于电波波长约为15m，所以这个频段的天线以旋转定向天线为主。进行DX的电台常使用六单元、七单元以上的定向天线，此外由于初学者较多，使用较为初级的无方向性的垂直天线的电台也比较普遍。</P> <P>从24.890MHz到24.990MHz的100kHz是24MHz段。这个频段和前面所述的10MH2、18MHz频段一起由WARC-79规定准许供业余业务使用，日本从1989年7月1日开始使用。本频段具有前述的21MHz频段和后述的28MHz频段的中间特性</P> <P><a href="http://theory.oecr.com" target="_blank" class="relatedlink">资料</a>来源 日本业余无线电联盟《JARL Radio Amateur`s Hand-book》） </P></td></tr></table> </div> <div id="comment_223316" class="cm"> </div> <div id="post_rate_div_223316"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=29995&formhash=d8d614fb" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber" style="display:none">0</span></i></a> <a class="followp" href="home.php?mod=spacecp&ac=follow&op=relay&tid=29995&from=forum" onclick="showWindow('relaythread', this.href, 'get', 0);" title="转播求扩散"><i><img src="static/image/common/rt.png" alt="转播" />转播</i></a> <a class="sharep" href="home.php?mod=spacecp&ac=share&type=thread&id=29995" 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