Here it is Ed: "The turns ratio shown is actually 2:15, implying a nominal
impedance ratio of 1:56 (NOT 1:49), or a nominal load of 2813 ohms. Beside
that, the measurement technique looks sound." This was the video in
context:
Actually I had not counted the turns ratio and presumed that it would be
49:1 as it came with an End Fed Half Wave Antenna for 40-10m with 20m long
wire. Later due to mounting constraints, I had shortened the wire to 10m
and could work K1LJ on 20m SSB. Still later when I wanted to try other
dipoles, I took it down and it is now safe in my almirah!
73
Jon, VU2JO
On Thu, May 8, 2025 at 8:06?AM AG6CX via groups.io <edwmccann=
[email protected]> wrote:
Jon-
Please repost Owen¡¯s comments to which you refer.
Thanks
Ed McCann
AG6CX
On May 7, 2025, at 6:19?PM, alan victor via groups.io <avictor73=
[email protected]> wrote:
?Hello Jon.
What you demo in the video is quite fine.
No issue and Owen's comment is appreciated and correct.
The turns ratio appears to be 15 to 2 or 56.25:1 not 49:1, no issue.
Yes, the dipole is a balanced antenna, volumes of discussions
on the various forums. An appropriate BALUN, so called current
balun would be applied. And the UnUn unit shown in your video
would not be appropriate and the impedance transformation that
it provides is not desired.
My comments were to clarify that this particular unit
you showed in the video is a magnetic coupled transformer
and is indeed unbalanced in its application.
