Richard Clark wrote:
On Tue, 08 Nov 2005 16:13:34 -0800, Jim Kelley
wrote:


It is fixed by creating a uniform field. As I said before, integrating
the results from a large number of individual point sources (rather than
superposing the fields from a large array of point sources) would not
produce an interference pattern.


Hi Jim,

Here you are clearly wrong in some presumption. For one, I have done
exactly as you have demanded should be done and you find an error. I
have responded several times to this identical complaint you've
offered, and you have neither offered what that error is, or where I
differ from what you insist in integrating the results. It seems to
me in performing it exactly as you describe it, that I have very
little choice in that matter anyway and barring further elaboration in
how my fulfilling your imperative differs from your imperative, your
point remains rather elusive.

You forgot to write - Harumph! ;-)

If you'll read back, you'll find that the descriptions you've provided
of your model are far less than effusive and illuminating. No more than
a few partial or incomprehensible sentences were provided. We're left
to guess most of the details of what you have done. I can only deduce
some of it from the results you have provided. I made no criticism of
this. You spoke of symmetries and lost power without mention of their
nature. So I mentioned their nature. It should have been obvious, but
you hadn't even alluded to a possible explanation for this "lost power".

BTW, single sources do not produce interference patterns (unless somehow
you're inadvertantly causing diffraction somewhere between the source
and the antenna). Each individual source will provide a signal. The
amplitude and phase of the signal rendered in the antenna from a single
source will depend the position of the source relative to the
orientation and construction of the antenna. Summing all the individual
signals rendered in the antenna from a multitude of individuals sources
does not create an interference pattern in 3 space. It produces a
simple magnitude and phase which would hypothetically appear in the
antenna if an incoming uniform 'spherical field' existed.

However, let's just cut to the chase in that you are clearly disturbed
by this "interference pattern" that the tool so clearly reveals.

I don't find interference to be disturbing. I'm simply pointing out
that we shouldn't expect textbook results from antennas that are
positioned amidst interfering sources. I'm sorry to have perturbed you
with my comments and observations. Any criticisms you may have
precieved should have been taken as purely constructive to the task.
That is my only intent.

73, ac6xg