160 M G.P급전부 문의 했더니 답이 왔네요..
Hello Kim-nim HL4GHT
Basic explanations,
*The structure of this antenna
http://www003.upp.so-net.ne.jp/JH1GVY/t-vert-radix2-22m_160m.gif
*The structure of feeding point
http://www003.upp.so-net.ne.jp/JH1GVY/feedbox.gif
*Ferrite toroid specifications
https://www.amidoncorp.com/specs/2-06.pdf
An answer,
There is not the conviction that my way is the best.
However, I decided a feeding method by the following ways of thinking.
And, as a result, nothing had a problem.
I feel that this method works well.
1, Why we need balun?
I use this antenna with portable in the field.
It is difficult for me to realize good grounding to build this antenna
every time within only one hour.
Therefore, I decided to use elevated radial not direct grounding.
In the case of a dipole antenna, even if there was not balun, there was
not the big problem, however,there had better be balun.
Because elevated radial is not connected to the earth, I think it is
the same in the case of dipole.
2, Why we need transformer?
A transformer is necessary to let 50 ohms do matching because the input
impedance of this antenna is about 21 ohms.
PS:
I use this antenna without a problem at max power 50 watts, but
attention is necessary because a ferrite core may run hot in the case of the
bigger power.
JH1GVY / Mori
Hello Kim-nim HL4GHT
Basic explanations,
*The structure of this antenna
http://www003.upp.so-net.ne.jp/JH1GVY/t-vert-radix2-22m_160m.gif
*The structure of feeding point
http://www003.upp.so-net.ne.jp/JH1GVY/feedbox.gif
*Ferrite toroid specifications
https://www.amidoncorp.com/specs/2-06.pdf
An answer,
There is not the conviction that my way is the best.
However, I decided a feeding method by the following ways of thinking.
And, as a result, nothing had a problem.
I feel that this method works well.
1, Why we need balun?
I use this antenna with portable in the field.
It is difficult for me to realize good grounding to build this antenna
every time within only one hour.
Therefore, I decided to use elevated radial not direct grounding.
In the case of a dipole antenna, even if there was not balun, there was
not the big problem, however,there had better be balun.
Because elevated radial is not connected to the earth, I think it is
the same in the case of dipole.
2, Why we need transformer?
A transformer is necessary to let 50 ohms do matching because the input
impedance of this antenna is about 21 ohms.
PS:
I use this antenna without a problem at max power 50 watts, but
attention is necessary because a ferrite core may run hot in the case of the
bigger power.
JH1GVY / Mori
es
저녁에 전주에서 뵙지요.