On 16 Oct 2006 13:06:58 -0700, "art" wrote:

Walt
I said that both antennas are beams. What I was addressing was the
height portion of the question whereas tho they are both beams the
effective height measurements were different.
i.e Planar beam versus other beams where the quad is not a planar beam.
Seems like effective height measurements contribute to most yagi /quad
comparison debates. There is also another side of the coin when
measuring effective ht and that is when a yagi is positioned vertically
where it is still planar when comparing to a quad element moved thru 90
degrees.which is now planar. If you chose to answer the posting what
part of my posting would you leave out, or question its veracity
especially after reading the total thread?
Regards
Art

Walter Maxwell wrote:
On 15 Oct 2006 21:35:43 -0700, "art" wrote:

Yes there is a difference, A yagi is a planar beam ie on a single plane
so the height of the array is the same for all elements in the array
which creates a major lobe or beam.
If the array is not planar such as a Quad then the elements are at
different heights
so the true or effective height of a quad antenna which is also a beam
style antenna is approximately the center point of the array or
somewhere between the top and bottom of the quad element.
The point to stand by is that the height of the feed point is
immaterial with respect to the effective height of an array. In another
post I pointed out that no matter which element is fed in a array the
effective height of the array is always the same and thus the TOA is
always the same
Regards
Art

Hi Art,

One of the most demeaning aspects of this newsgroups concerns misunderstandings
of definitions and terminology that often leasd to unfortunate and unnecessary
arguments.

To wit: Yagi vs beam.

It's been my understanding that any combination of radiating elements intended
to radiate more energy in one direction than omni establishes a major lobe that
is called a beam. In other words, any directional system establishes a beam.
Therefore, 'beam' is generic to all directional radiators.
It then follows that 'Yagi', 'quad', 'W8JK', 'EDZ', are all 'beams' of a
particular type or configuration.
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I agree, where did I say different?
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Ok Art, here's the way I saw it:

Sal Manela sez: "Before anybody tells me there is a difference between a yagi
and a beam, let me thank you in advance."

Then you replied, "Yes there is a difference,"

So Art, my response was only to refute your statement above. I don't dispute
your other statements.

Walt, W2DU