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SM0DTK's 40 meter Moxon

Wire MOXON for 40 meters

    During summer days, I stay in my summerhouse in Gotland Island (EU-020) east of Sweden in the Baltic sea. A wonderful place not only for recreation but also for working HAM radio. No man-made QRM makes it easy to copy weak DX on higher bands, but on lower bands there are some problems with strong signals from Europe.

   在夏天，我住在哥特兰岛（eu-020）的度假房里，它位于瑞典以东波罗的海中。这里不仅仅是一个度假娱乐的好地方，同时也是业余无线电操作极佳的地点。没有人造的电波噪音，可以很轻松抄收到更高频段的DX信号，但是在较低的波段则有一些问题，因为有来自欧洲的强信号干扰。

    In morning hours we have pretty good conditions on 40 meters to the Caribbean sea in western direction but as mentioned some problems with QRM from strong east European stations.

   早上在40米波段，这里向西方的传播非常好，可以开通加勒比海地区，但是我们之前提到过来自东欧地区强信号干扰，可能会使得我们的通联遇到一些问题。 

    On my lot I have some pretty high trees (15 meters) which can carry wire antennas. So what antenna to hang up to get some gain to the west and to reduce signals from the east? My choice was to try a moxon wire antenna made by very thin wire to reduce weight. I started up the Moxon Rectangle Generator and calculated the dimension for the antenna. Then I cut the wire according to the result from the generator and made some supports for the corners and for the feeding point by plexiglass.

    在我的院子里有一些很高的树木（15米），他们可以用于搭建线天线。那么我将架设一款什么样的天线，既能增加西部的信号增益，而且同时又可以抑制来自东面的干扰信号呢？我的选择是尝试制作一款线型的MOXON天线，为了降低天线的重量我使用了非常细的导线。我打开了MOXON天线软件，并开始计算天线的尺寸。接着我按照计算结果截取了导线，并且使用有机玻璃制作了四个角和馈电点的支撑。

    Now comes the tricky part of the installation. How to get the supporting lines up in the trees? I used an aluminium tube joined with a glass fibre rod and was able to get the bearing points up about 14 meters in four suitable trees for my project. I spent some time to get the right shape of the rectangle by adjusting the length of the four supporting lines.

    现在到了最为棘手的流程---架设天线。如何能在树上固定拉绳呢？我将一截铝管和一个玻璃纤维支撑杆连接了起来用于在树上穿拉绳，通过4棵合适位置的树，我终于使得承载点在14米高的位置。我又花了一些时间来调整四条拉绳的长度以获得一个完美的矩形。

    Now it was time to connect the coax to the transceiver and measure the SWR. Sometimes fate is overwhelming so in this case SWR was perfect and I could use my 100 watts directly without any tuner. I used a long-wire antenna (60 m) and a full size GP for 40 meters  to compare signal strengths with my new antenna. My expectations on my Moxon came true. I got my gain to the west and the QRM from the east was much lower. I easily worked DX in the Caribbean using 100 watts and I even thought that the morning sun was shining brighter. You can find more info on antennas, also a Moxon for 20 meters, at my websitehttp://hem.passagen.se/sm0dtk  

--73, Martin, SM0DTK

    现在到了将天线通过馈线连接到电台并且测量驻波的阶段了。有时候幸运会非常眷顾你，这个时候驻波是很完美的，我就可以不用任何天调直接使用100瓦功率。我之前在40米波段使用过一条长线（60米）和一个全尺寸GP天线，可以用这两个天线来对比我的新天线。我对于MOXON天线的期望变成了现实。我得到了向西面的信号增益，并且抑制了来自东面的信号干扰。我现在可以很轻松的使用100瓦功率对加勒比地区做DX通联，这让我甚至觉得早上的太阳更加明亮了。您可以通过我的网站找到更多的天线信息，当然还有20米波的MOXON，这里是我的网站http://hem.passagen.se/sm0dtk 

ed:  Martin has a wonderful website and a large antenna section with many designs and construction details.  It's well worth the visit!

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备注：马丁有一个非常棒的网站，里面有一个庞大的天线版块，其中包含非常多天线设计制作的细节。很值得访问。(这也是BI4JUR的梦想)

    访问者反馈：[当我访问的时候出错了！]