[Antennas] RE: J POLE QUESTION

[Dan Richardson]

At 11:15 AM 7/11/2002 -0400, Ron wrote:

>   And which myth is that?  A "J" pole IS a vertical, end fed dipole,
>which perform as well as a quarter wave ground plane, but require no
>radials whatsoever.

A conventional j-pole is an end fed =BD-wave mono-pole. All mono-poles=20
regardless of length must work against something.

>   Many others and I don't make "J" poles "fed with coax as is the
>current style" we feed it through a quarter wave sleeve balun or we
>bend the "J" pole 90 degrees between the stub and the dipole. So there.

The sleeve matching section is the best way to go and produces the best=20
omni-directional azimuth pattern. However, have you measure or modeled you=
=20
elevation and azimuth patterns for j-pole with the *bent* stub?  If you did=
=20
you'll find that it is not truly omni-directional and the azimuth pattern=20
will be skewed with maximum azimuth gain in the direction that the stub is=
=20
bent.

Danny, K6MHE