On 16 Jun 2005 10:29:02 -0700, "Al" wrote:

I suggest that you would take the time to learn what causes common
mode current to be present on coax transmission line - regardless of
what kind of an antenna it is employed. (For openers I suggest you
start here http://www.w2du.com/r2ch21.pdf )

Then, after getting a grasp on that aspect continue to learn how
common mode current on the transmission line can effect the overall
performance of an antenna's radiation pattern - especially with VHF &
UHF antenna systems then you just might understand what people here
are trying to tell you.

Still others can't seem to understand that effects too small
to measure usually do not matter in the real world.

Others have measured this and reported it to you, but for some reason
you chosen to discount anyone who can show that it disagrees with your
"pet" theory. For me, I've place your theory along with the world is
flat, the moon is made of green cheese, and Iraq has weapons of mass
destruction .

But even for a skeptic, I would thing that the thought of coiling up a
few turns of coax costs very little, definitely won't hurt, and can
only help. Would be sufficient.

Danny, K6MHE

I said I was done with this subject, But ........ I can't take it
anymore.
Again, the Arrow Antenna OSJ Antenna does NOT need a choke balun.
By that I mean it will make no noticeable difference in performance of
this particular antenna.
(I am not lumping all VHF & UHF antennas together. I am ONLY talking
about the OSJ).
If you don't have a physical Arrow Antenna OSJ to test with and without
a balun, you don't know what you are talking about.
That goes for computer modeling also. You can't hook up a radio to
computer model.
This antenna works just fine the way it is.

By the way Danny, what is the name of your Antenna Company ?

73 Al Lowe N0IMW Arrow Antenna

Allen,

My comments were directed to Ed not you, however, can you please
explain to me what is the magical ingredient in your OSJ that makes it
different than any other antenna known to man in that there will be no
common mode current on a coax transmission line when directly
connected to the antenna?

Understand I am not saying your antenna doesn't work - never did say
that. I will say that using a choke at the antenna's feed point will
assure that the antenna will be operating at its best (maximum signal
towards the horizon). By not using a choke can cause an increase to
high angle radiation at the cost of reducing radiation toward the
horizon due to common mode current on the transmission line - just
like any other VHF antenna feed with coax. In other words the antenna
is still radiating the same amount of power, however, much of the your
signal is being wasted in the wrong direction (unless you are talking
to airplanes). For the sake of me I can't fathom why you can not
understand that.

As for you question: I did not claim to own an antenna company. Is
that germane to the subject of the thread?


73
Danny