On Jan 11, 1:20*pm, Richard Fry wrote:
On Jan 11, 12:50*pm, Art Unwin wrote:

I could do that but you will only accept what you yourself can
prove by your own means.

No, I accept the work of Kraus, Terman, Balanis etc and the
experimental work of George Brown et al as they have written and
proven it.

The undocumented statements of Art Unwin I do not.

I fully understand that.But curiousity surely must creep in if there
is a suggestion that the antenna programs do not agree totally with
the books by straying towards tilted radiators. Which is correct one
might ask!




But for your edification, Art, below is a link to what NEC shows for a
full-wave, base-fed vertical monopole over a perfect ground plane.

Very good, you do have a vestige of curiousity




Note that it has zero gain in the horizontal plane, and about 6.7 dBi
gain at an elevation angle of 37 degrees. *So yes, tilting the
radiator would increase gain in the horizontal plane, by varying
amounts depending on azimuth (two azimuths would still be zero)..

Well that is one way of looking at it which is probably why in some
instances they changed to sloping dipoles. to enhance the polarity
that was required


Is this the basis for your claim? *If so, why would anyone install
such a thing, as more than that peak gain in the horizontal plane is
supplied by a cheaper, shorter VERTICAL monopole of about 0.6
wavelengths.

Not totally but it is a variation to what the books state so my
curiousity questions why
I would opt for a vertical radiator that does not rely on the ground
to provide an answer.
Always remove the maximum variables before determining the truth



If this model is not what you have in mind then please completely
define your radiator (including how it is fed and its relation to the
ground plane), and your meaning of "best results" due to tilting it.

Members of the group oppose the idea of sloping antennas but without
reason
It is certainly a good place to start. To me best results is
determined by your needs whether it is total gain, polarity or what
have you. As I stated aproach the proof in your own way with out
interference from others. If you feel that a tilted antenna provides
more gain than a vertical antenna
then you have the solution. From what you are saying you are aiming
either for maximum gain regardless of polarity OR since you are using
a vertical antenna your desires are for maximum vetical polarity. But
that is my interpretation because you did not state yours.
Note Kraus stated a case where the angle of the radiator is best at
about 14 degrees and you trust him


*http://i62.photobucket.com/albums/h8...eVerticalMonop....

The graph seems o.k. depending on what your desire was. What ever your
desire is you can tilt things while keeping the radiator resonant to
determine the finality of the debate. The ground is perfect right? Let
me know what your desires are for this antenna so I may repeat all the
motions you undertake. Obviously you are on your own and by use of the
computer program you have a modicom of trust in them, which is
encouraging.
You are now on your way but apparently ....alone !
Onward, Onward and now allow the lemmings to follow you



RF