knormoyle@surfnetusa.com wrote:
> If you're saying a single wire with LC match can have same bandwidth and
> lower loss, I guess I find that hard to believe?
That is not apples vs apples.
If you make the antenna out of two wires, but simply tie
them together to make a "fatter wire", then the LC network
wins. It might still win with a single wire, because the
fatter wire doesn't help the bandwidth all that much.
The reason why a lumped element network is more broadband
that any sort of distributed structure is that the inductance
or capacitance of a distributed structure increases with frequency,
which decreases the bandwidth. The inductance or capacitance
of a lumped element is constant, by definition.
> Am I missing a loss calculation in open sleeve designs?
Open sleeves, like linear loading, are not lossless, or even
necessarily less lossy than good lumped elements. There is a
lot more lossy wire in a parasitic element than in a coil.
>
> -kevin
> ad6z
See:
QST Oct 1986 P27
QST Jun 1985 P42
QST Jul 1984 P45
QST Apr 1983 P22
available at arrl.org
Rick N6RK
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|