On 5 Feb, 13:09, "art" wrote:
On 3 Feb, 19:51, "Ralph Mowery" wrote:

Has anyone modeled what happens to the signal of a triband 3 element antenna
that has one or more of the elements that has slipped on the boom say 10 or
20 deg ?

Also saw in an old magazine an antenna for 2 meters that had each element
offset by about 5 or 10 deg around the boom to produce circular
polarization. Will this actually work or is it wishful thinking ?

Ralph you are getting very close to reality.If all your elements are
close to individual
resonance then slippage upto 30 degrees will be to your advantage. At
the same
time your total gain will consist of the addition of all other
polarizations including circular

With respect to the 2 meter antenna, if I remember correctly the
successive angles must
be between around 20 to 30 degrees and none of the elements will
measure a half wave
length since they must all be resonant despite the coupling effects
which adds to
complications in manufacture.
Still if you feed one element at a time you can eventually get to
Eldorado, if not then
get in touch with your requirements and I will provide the dimensions
and if you have
any doubt you can use your own program to check its validity.
Have fun
Art

No I am not saring that! What I am saying is that an anterna can
radiate
in many ways at the same time. One or all of them can combine or
cancel
to provide a max radiation field. Why I mentioned that was if a
radiator was
horizontal which hams would normally favour would favour horizontal
polarization and other polarizations would suffer.
If the array did not favour a particular polarization by being placed
at an
angle to the surface of the earth you would hear signals at different
distances
because of various polarization signals one can receive. In other
words your
antenna covers a larger land area than say a horizontal antenna
alone.
This could well be why a Yagi appears not to hear as well as a quad
which hears a variety of signals from different distances but of
course
many would argue the validity of that statement just for aurguments
sake
alone.!
The Gaussian clustered arrays that I talk about are radiating arrays
of arbitary
positions and angles relative to one another such that they are
suitable for use
at any polarization required for advantage. Also because all elrments
are resonant
interchange of driven elements can be attained to porvide alternate
polarizations
a challenge that I understand Yuri is presently pursuing for various
reasons tho
I understand it is mainly to combat fading of signals, but he can
explain for himself..
Art