[Antennas] SWR Isn't Enough

2002年4月27日 20:54:41 -0500

So we know that SWR isn't enough in determining a 'good' antenna. What other
information is needed? Specifically, how do determine from a model if an
antenna is efficient, i.e. putting the most signal into the air? Neglect the
radiation angles and directions. While they are important they are readily
obvious from the model, it seems.
I've been reading Cebik's web pages. There is an article -
http://www.cebik.com/aledz.html - about an 'one antenna' for upper HF that
is 44' long. At one point he comments that the impedance across all the
bands is 'manageable'. I modeled the SWR across the bands and it seems
non-manageable to me. Any comments on what to consider manageable? One
criteria I'm looking at is the spec on my automatic antenna tuner which says
it will handle an SWR up to 10:1 or impedances to 800 ohms.
Start at the basics with me, please. I have the NEC4WIN evaluation version
to see if antenna work is something I want to explore. Plus I'm trying to
find a good HF antenna for my location. It has to be stealthy but not
terribly so. I do have areas where I could hid a vertical, say, or a
horizontal wire. Also could probably put a delta, say, on the side of the
house.
Rud Merriam
K5RUD