“ Wisteria twigs and my loop antenna”

2011/07/14                     日本語は下にあります。   ve3cgc@hotmail.com


“ Wisteria twigs
and my loop antenna “      「藤の木の小枝とアンテナ」



I have a wisteria trellis and wisteria
trees at my backyard.  After enjoying the
beautiful flowers in May, they will be gone at the beginning of June.   Then there are lots of twigs coming out and


I have a 40m wire loop antenna right above the
wisteria as shown on the attached pictures.
I cut these twigs during summer about every two weeks so that the
antenna will not be tangled with the twigs.


In summer last year, I was on air on 40m
every day using this loop antenna and noticed that no twigs tangled to the wire
loop.  Then in late July I was out of
town for two weeks.   When I returned, a
dozen of twigs were seen tangled and I thought that when some RF energy is transmitted
through the antenna, the twigs stop tangling to the antenna.


This year I decided to carry out an
experiment to prove that the twigs do not tangle to the antenna when RF
energies are released from the antenna.


On July 8th, I cut the twigs cleaning
up except two twigs nearly tangling to the loop.   I purposely went on the air with 20watts of
power into the loop talking to K3XI and W8WGR for about 45 minutes.  Then I noticed that the twigs were no longer
tangled and not touching, and being away from the loop which was a good
sign.  On July 9th, the following
day, I continued transmitting RF energy through the loop.  I QSOed with WB8APR with 20w, N3RSD with 30w,
K9DU, WA1FCN and K9SD with the power of 3 watts respectively.  There was no sign that the twigs become
touching the loop at all.


I went on the air to monitor the twigs on
the following three days and I saw twigs neither touching nor tangling to the
wire loop antenna.



Hiro Hayashi  ve3cgc@hotmail.com






私の家の裏庭に40mバンドのループアンテナがあります。  藤の木が棚にしっかり載っていて、毎年5月にきれいな花を咲かせ、楽しませてくれます。  6月になると花は落ち、小枝がたくさん出て、小枝のすぐ上にあるループアンテナにからもうと伸びます。  去年、気がついたのですが、アンテナから電波を出している時は小枝はアンテナに絡みませんが、電波を長く止めると小枝がからんでしまいます。




7月8日、20WでK3XI とW8WGRと約45分くらい話したところ、2本の小枝は絡むのをやめ、アンテナから離れる方向に、まるで目があるかのように、伸びてゆきました。


翌日、9日は20wでWB8APR, 30w でKC9SNC、2wでN3RSD,
K9DU, WA1FCN, K9SD 局とそれぞれQSOをしました。  その結果、小枝は全くアンテナに絡む様子は見せず、私が思ったように、アンテナから電波を出していれば、藤の木の小枝はアンテナに絡まないことを確認しました。




写真を載せてありますので見てください。  クリックすると写真は大きくなります。



ひろ はやし  ve3cgc@hotmail.com

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