ＣＱ誌のJP6VCH松木さんの記事を見て製作したもの。まず７ＭＨｚで使ってみると期待した以上の性能で、八戸の単身アパート時代は出力０．１～０．５Ｗとこのアンテナで多くの北米局と交信している。２８ＭＨｚでは短縮コイルを短絡するとちょうど半波長の垂直ＤＰとなるので端部給電用のカプラーを使えばＦＢに電波が乗る。１０ＭＨｚはタップ調整で共振点を見つけ、ＣＬＣ型カプラーでマッチングさせればＯＫ。７ＭＨｚも１０ＭＨｚも２８ＭＨｚもコンディションが上がれば０．５ＷのＣＷで日本国内全域と快適にＱＳＯできる。ワイヤーと軽量コイルだけなので登山やハイキングに好適であり、お気に入りのポータブルアンテナになった。(２０１０年製作)
I made this antenna according to the JP6VCH article of JA-CQ magazine,
and the 7MHz performance is much better than expected. I have contacted
many north American stations with my QRPP (0.1w to 0.5W) rig and this VCH
antenna combination in Hachinohe of JA7. It just becomes a 28MHz vertical
DP of a half wavelength if the coil is short- circuited (bypassed). Therefore,
if the L-match type of coupler is used, it’s easy to get a good VSWR. In
the case of 10MHz, after you found the resonance point on the coil, the
impedance matching is easy with the CLC type of antenna coupler. If the
condition goes up, each band is good comfortably at QSO with the whole
area of Japan-domestic with 0.5W CW. It is suitable for climbing and hiking
because it is made only of a wire and a light weight coil. And, it became
a portable antenna that is not able to be parted with. (I made it in 2010)
