All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.

"Bobby" wrote in message
ups.com...
All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.


Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

ups.com...

All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.

Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art

"art" wrote in message
ups.com...
On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

ups.com...

All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.

Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio
is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art


Hi Art

I may make mistakes by using non scientific terms. When I read my post,
I realize that nothing is actually defined by my above statement. I would
submit that a LHCP antenna will receive no RHCP signal. I'm sure you know
that any linearly polarized antenna is insensitive to linearly polarized
signals that are orthogonal to the line of polarity of that antenna.
Tell me more about the "weather antennas". What frequency do they use?
Where do they transmit from?

Jerry

On 14 Feb, 07:18, "Jerry Martes" wrote:
"art" wrote in message

ups.com...





On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

roups.com...

All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.

Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio
is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art

Hi Art

I may make mistakes by using non scientific terms. When I read my post,
I realize that nothing is actually defined by my above statement. I would
submit that a LHCP antenna will receive no RHCP signal. I'm sure you know
that any linearly polarized antenna is insensitive to linearly polarized
signals that are orthogonal to the line of polarity of that antenna.
Tell me more about the "weather antennas". What frequency do they use?
Where do they transmit from?

Jerry- Hide quoted text -

- Show quoted text -

Weather experts have found that using both horizontal and vertical
polarizations coming from the same antenna tho in separate pulses that
with oncomming clouds and weather systems that the received picture is
more defined where size of droplets can be determined as well as other
things.
I would suggest that things like wind shear would also be more
discernable.
My antennas because elements are non defined in placement to each
other are capable of multi polarizations which is why I posed the
question.
Art

"art" wrote in message
ups.com...
On 14 Feb, 07:18, "Jerry Martes" wrote:
"art" wrote in message

ups.com...





On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

roups.com...

All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation
from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.

Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial
ratio
is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art

Hi Art

I may make mistakes by using non scientific terms. When I read my
post,
I realize that nothing is actually defined by my above statement. I
would
submit that a LHCP antenna will receive no RHCP signal. I'm sure you
know
that any linearly polarized antenna is insensitive to linearly polarized
signals that are orthogonal to the line of polarity of that antenna.
Tell me more about the "weather antennas". What frequency do they
use?
Where do they transmit from?

Jerry- Hide quoted text -

- Show quoted text -

Weather experts have found that using both horizontal and vertical
polarizations coming from the same antenna tho in separate pulses that
with oncomming clouds and weather systems that the received picture is
more defined where size of droplets can be determined as well as other
things.
I would suggest that things like wind shear would also be more
discernable.
My antennas because elements are non defined in placement to each
other are capable of multi polarizations which is why I posed the
question.
Art

Hi Art

What frequency for the weather signals when using diversity?

Jerry

On 14 Feb, 07:52, "art" wrote:
On 14 Feb, 07:18, "Jerry Martes" wrote:





"art" wrote in message

oups.com...

On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

roups.com...

All,

How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.

Any ideas on the equation or where I can find it will be helpful.

Thanks.

Bobby.

Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio
is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art

Hi Art

I may make mistakes by using non scientific terms. When I read my post,
I realize that nothing is actually defined by my above statement. I would
submit that a LHCP antenna will receive no RHCP signal. I'm sure you know
that any linearly polarized antenna is insensitive to linearly polarized
signals that are orthogonal to the line of polarity of that antenna.
Tell me more about the "weather antennas". What frequency do they use?
Where do they transmit from?

Jerry- Hide quoted text -

- Show quoted text -

Weather experts have found that using both horizontal and vertical
polarizations coming from the same antenna tho in separate pulses that
with oncomming clouds and weather systems that the received picture is
more defined where size of droplets can be determined as well as other
things.
I would suggest that things like wind shear would also be more
discernable.
My antennas because elements are non defined in placement to each
other are capable of multi polarizations which is why I posed the
question.
Art- Hide quoted text -

- Show quoted text -

If you put that same question to Google it would be more informative.
Apparently every forward thinking nations have scientists dabbling
with it
funded by the concern with global warming. I find this all very
interesting because as a ham I had been concentrating on vertical and
horizontal polarizations only Seems like space has opened up the
antenna field such that many will be able to review the path that
antennas have taken over the last century that have appeared to stymy
progress and with an open mind
change course
Art

art wrote:
On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

ups.com...

All,
How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.
Any ideas on the equation or where I can find it will be helpful.
Thanks.
Bobby.
Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art


Any cross polarization situation will exhibit insensitivity to others.
For instance take a vertical antenna and a horizontal antenna at a
distance. There is a signifant reduction in signal strength.
Or take a dipole oriented NS and a dipole oriented EW and you will see a
loss of signal also.

Dave WD9BDZ

On 14 Feb, 09:55, "David G. Nagel" wrote:
art wrote:
On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

roups.com...

All,
How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.
Any ideas on the equation or where I can find it will be helpful.
Thanks.
Bobby.
Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art

Any cross polarization situation will exhibit insensitivity to others.
For instance take a vertical antenna and a horizontal antenna at a
distance. There is a signifant reduction in signal strength.
Or take a dipole oriented NS and a dipole oriented EW and you will see a
loss of signal also.

Dave WD9BDZ- Hide quoted text -

- Show quoted text -

David, could you add to your posting some of it doesn't seem to jive.
Art

On 14 Feb, 11:01, "art" wrote:
On 14 Feb, 09:55, "David G. Nagel" wrote:





art wrote:
On 13 Feb, 22:18, "Jerry Martes" wrote:
"Bobby" wrote in message

roups.com...

All,
How do you determine the axial ratio from a RHCP wave to a LHCP wave
from an antenna? In essence, I need an axial ratio transformation from
RHCP to LHCP.
Any ideas on the equation or where I can find it will be helpful.
Thanks.
Bobby.
Hi Bobby

If you are working with an antenna that radiates RHCP it is totally
insensitive to LHCP.
If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio is
the ratio of the Minor axis to the Major axis of the E field. So, it
varies from zero to one as the radiated field varies from Linear to
Circular.

Jerry

You mentioned insensetivity above, are there any other polarities
insensitive to others ? I note that weather antennas are now migrating
to
dual diversity antennas for horizontal and vertical, is it possible to
totally isolate those too.?
Art

Any cross polarization situation will exhibit insensitivity to others.
For instance take a vertical antenna and a horizontal antenna at a
distance. There is a signifant reduction in signal strength.
Or take a dipole oriented NS and a dipole oriented EW and you will see a
loss of signal also.

Dave WD9BDZ- Hide quoted text -

- Show quoted text -

David, could you add to your posting some of it doesn't seem to jive.
Art- Hide quoted text -

- Show quoted text -

David , maybe it was I that was not so clear.
My arials are based around a cluster of elements that are at various
placement with respect to each other tho all are resonant as is the
cluster as a whole. So when it is used for diversity operation because
more than one element is resonant choices can be made as to where to
feed to advantage
as quick as possible with a change over such that the reflection is
meaningful with respect to time. I don't believe that the weather
people radiate both at the same time as the search is for purity with
respect to polarity. In fact all the arials ive seen cannot possibly
be pure since they all seem to have elements in the vertical position
which cannot lead to purity in any form. I saw one in a antenna book
( shelnikov)where the elements were in helical form one behind the
other at a 90 degree offset but I have no further knoweledge of that
one. Somebody mentioned that some radios are now made with two ports
such that the receive portion automatically switches to the loudest
signal to overcome fading so I may well be incorrect about
simultaneous transmissions or even if two arials are in use.
Art