Radials -- the same length or not???
On Sun, 15 Oct 2006 21:17:50 -0600, Hank Zoeller
wrote:
John Ferrell wrote:
Your project has a lot in common with my ongoing 40-160 meter vertical
project. I am curious about what remote tuner you are planning.
Hi John,
The coupler is a Harris RF-601.
I suspect the Harris would match this antenna on 80 and maybe even 160
but I have no illusions about getting much radiation out of it on those
bands. My intention is to use in from 40 through 15 meters.
How tall is your antenna going to be? I'd enjoy having an 80 foot
vertical for 160 through 40 but that's just not going to happen. I'm
looking for low visual impact here..
I started with a 28 foot radiator and 3 radials. The focus has been on
the radiator, not the radial system. It has been easy to deal with in
both modeling and testing on 40M. The 40M (at 50') dipole included in
my A3S beam does seem to outperform it. That may simply be due to the
lower angle radiation of the vertical. On 80M the 28' vertical does
not seem worth much compared to a dipole at 45 feet. And the dipole is
resonant and well behaved.
At 160 meters it is tough to feed. Or may be impossible from my
perspective. It models OK, but matching schemes seem to be awkward and
inefficient. My latest idea is to use a vertical wire from the base of
my tower and bend it over at the 45 foot point and then horizontal to
a tree. If it models well, I will put it up and test it. I live in the
country and have several acres to work with.
John Ferrell W8CCW
|