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不知能否将此天线的长度加到20米左右,以兼顾80米波段的收发?同盼相关测试报告!
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理论上可行,但是目前还不知道振子和匹配部分多长,能够兼顾所有的业余频率。建议最好不要用1/2波长的物理尺寸。毕竟50ft的长度是经过理论和实践得出的成熟方案。
看看下面国外爱好者使用50ft版本的经验,说明该款天线可以工作在160-10米波段。
hb9lek rating: 5/5 feb 6, 2005 06:45
currently using it as back-up indoor antenna under the roof. performing equal to my fd-3 windom installed outside along the walls of my house. can easily be tuned to swr below 1.5 with my mfj-948 to all hf-bands (10m-160m). low profile and good quality wires incl. connectors. can only recommend this investement of some $30 (incl. shipping) as couldn't have built it myself in the same quality
hb9lek 对该天线给出了5分。他使用mfj-948天调可以天线工作在160-10米整个hf段,swr小于1.5。效果好于成品温顿天线fd-3.
p.s 在看一下对该款天线改进的建议
ab7jk rating: 4/5 apr 22, 2005 22:40
i cut this antenna to use on the higher bands, 20 - 10 meters since i didn't have the height for a 50 foot wire. i cut it to 33 foot radiator and 16 foot ground length but it did not work well on 20 meters. ater speaking to customer service who were very helpful, i cut it to 24 foot radiator and 12 foot ground. now i am able to make routine dx contacts on 20 and 15 meters using digital modes. i am quite pleased!
ab7jk 对该天线4分得平价。由于没有50ft高度的导线,他把天线修剪为振子33ft,匹配部分为16ft,期望它工作在20-10米波段,但是在20米却不能工作。在请教了热情的售后技术服务代表后,把天线修剪为振子24英尺,匹配部分(双线)12英尺,现在它可以非常满意地在20和15米波段做dx。
另外成品有有80-10米波段型,但是没有具体数据,好像不是振子加长到20米那么简单。这款天线主要还是供户外运动使用的,如果做得很长也就失去了便携性。如果不讲究效率,那么2.5米长的振子配合120天条都能工作。
如果真的想试验的话按照1/2+1/4波长调试,也许单波段可以满意工作,其他则不好说。