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 ?

On Feb 3, 7:51 pm, "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 ?


I've modeled similar things for sensitivity analysis of a design.
From a theoretical standpoint, what happens is that the mutual
coupling between the elements is reduced (to a first order, by
cosine(angle)), which changes the amplitudes and phases of currents in
the elements.

Net result.. not much change in forward gain (unless it's a very high
gain design with a lot of superdirectivity), pretty big changes in F/
B, if it was previously optimized for that. (that is, the nulls get
shallower.. a 1% change in currents can make a 20 dB null into a 17 dB
null)

As for making CP.. it might work, it might not. depends a lot on the
design. A Lindenblad makes CP with two elements about 60 degrees
apart. On CP in general.. it's easy to make elliptical pol.. tough to
make perfectly circular. This is particularly true if you want CP in
multiple directions (and it may not even be possible, depending on how
many directions.. viz the "hairy ball theorem").

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

On Feb 5, 3:09 pm, "art" wrote:
On 3 Feb, 19:51, "Ralph Mowery" wrote:
At
the same
time your total gain will consist of the addition of all other
polarizations including circular

You sure about that? I don't think you can add gain specs
from say vertical + horizontal, and claim an addition of total gain.
You have so much vertical, so much horizontal, and so much if
circular if fed to provide that, and each much be considered
separately.
I don't think you can add them all together. Course, I'll eagerly
await if any
comments to the contrary..
MK

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

On 8 Feb 2007 21:19:04 -0800, "art" wrote:

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.

This meager description hardly compares to the scope of coverage found
at:
http://www.qsl.net/kb7qhc/antenna/fractal/index.htm

Hundreds and hundreds of pages of designs, matching characteristics,
and radiation performance.

73's
Richard Clark, KB7QHC

"art" wrote in message
ups.com...
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


Polarity diversity is nothing new Art, the way you are trying to achive it,
if that is what your guassian cluster is all about is the wrong way to go
about it. First time you have even come close to describing what you are
doing.

On 9 Feb, 00:27, "Jimmie D" wrote:
"art" wrote in message

ups.com...





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

Polarity diversity is nothing new Art
,
I didn't sar it was

the way you are trying to achive it

I am not trying it is automatic because of the design,

if that is what your guassian cluster is all about is the wrong way to go
about it. First time you have even come close to describing what you are
doing.-


I have stated what it is all about and was quoted as being a
blithering idiot.
The group as a whole is not ready to accept anything that is not
written in
any book. Humans by their very nature are unwilling to accept change
so the
generation that comes along to suck up all that is written is the one
that
advances in science.
Art

Hide quoted text -

- Show quoted text -

On Feb 9, 10:41 am, "art" wrote:
On 9 Feb, 00:27, "Jimmie D" wrote:


The group as a whole is not ready to accept anything that is not
written in
any book. Humans by their very nature are unwilling to accept change
so the
generation that comes along to suck up all that is written is the one
that
advances in science.
Art


I could care less about books, although I do have quite a few.
I'm more convinced when I actually see something work.
If you are convinced this theory of yours has merit, why
can't you build one of the things and test it?
All this gaussian jibber jabber doesn't mean squat if you can't
build , test, and demonstrate one in the real world.
I read books, but I also usually test things in the real world to
verify the info is correct. Trust me, not much of what is in books
is wrong. Some is, but it's fairly rare overall.
If I were to come up with some new design, I would have built,
tested, and compared, before I even made any announcement
about the theory.
I get the impression that you cook up all these ideas, but
rarely actually test them in the real world.
That's no way to live, if you don't want the negative flak.
MK