On Sun, 01 Apr 2007 16:43:01 GMT, Walter Maxwell
wrote:

Richard, are you avoiding answering my question because you don't want to admit that the null in an antenna
pattern results from interference between two coherent fields?

Hi Walt,

Of course a null, or a peak, or any point in between results in the
interference (the combination of energy phases as power from separate
sources, or separate waves) found only in a load. I recall having
posted comments specifically to the issue of phase combination several
many times in as many days. I will do it several times more he

That same point in space without that load has absolutely no effect on
any energies that passes through it. Energies do not mix (combine) in
linear space; thus one energy can have no effect on other energies.
Any single energy is unperturbed by any other energies without that
load to offer a point of summation (the point of interference). That
unloaded point in space cannot support reflections or force any change
on any energy.

Interference is not the cessation of energy flow; it is not an
impediment to energy flow; it is not an redirection of energy flow; it
is not the amplification of energy flow; it is merely the passive
observation at a point of the summation in a load of all contributions
of energy flow. Further, the load may compound the redistribution of
energy flows (AKA directors or reflectors) becoming, as it were, a new
and separate source for a yet another remote load to combine new phase
relationships into a new null/peak/what-have-you. Remove the load,
and those products disappear.

Interference follows the load. Interference is caused by source
relationships developed at the load. Move ANY of these actors, and
the entire map of responsivity changes. All antenna graphical lobe
descriptions demonstrate this.

73's
Richard Clark, KB7QHC