On Mon, 15 Feb 2010 19:04:51 -0800 (PST), JIMMIE
wrote:

A different perspective on polarization loss?

Different? How? All pretty standard stuff.

As for different literal perspectives of polarization, I am sitting
here with two sets of 3D glasses for "Avatar" (just got back from the
IMAX version) and these two pair of glasses are very different from my
experience with Polaroid lenses of days gone by. And they are very
different from each other for the same movie.

The Real3D glasses at IMAX didn't work as normally worn, I still saw a
double image; but viewing the movie through the lenses backwards (ear
pieces going forward) rendered the IMAX 3D as 2D.

Now, when I sit here at the console and view the display (flat screen)
through the IMAX lenses, I can dim the display by rotating the pair.
One eye piece goes black at 45 degrees rotation, and the other eye
piece goes black at -45 degrees rotation. Flip them to look through
them backwards, and the same effect is observed.

When I take the Real3D pair and rotate them, only a slight shift in
hue: yellow tint in both lenses at 45 degrees rotation, and a blue
tint at -45 degrees rotation. When I flip them to look through them
backwards, I encounter a slight brightening for both lenses at 45
degrees rotation and a complete blocking for both lenses at -45
degrees.

I am familiar with display technology employing LCDs with double
polarization to increase contrast, and I could easily expect this from
the lenses of these two pairs of 3D glasses. Without having gone
further into researching it, I have a hunch that I am encountering
circular polarization here.

A little digging will tell.

73's
Richard Clark, KB7QHC

On Mon, 15 Feb 2010 22:44:13 -0800, Richard Clark
wrote:

Without having gone
further into researching it, I have a hunch that I am encountering
circular polarization here.

Yep. RealD XL 3D is circularly polarized:
http://en.wikipedia.org/wiki/RealD_Cinema
http://en.wikipedia.org/wiki/List_of_RealD_films

"How to avoid getting a 3D headache while watching Avatar"
http://www.shadowlocked.com/index.php?option=com_content&view=article&id=70:ho w-to-avoid-getting-a-3d-headache-while-watching-avatar&catid=41:feature




--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Jeff Liebermann wrote:
On Mon, 15 Feb 2010 22:44:13 -0800, Richard Clark
wrote:

Without having gone
further into researching it, I have a hunch that I am encountering
circular polarization here.

Yep. RealD XL 3D is circularly polarized:
http://en.wikipedia.org/wiki/RealD_Cinema
http://en.wikipedia.org/wiki/List_of_RealD_films

"How to avoid getting a 3D headache while watching Avatar"
http://www.shadowlocked.com/index.php?option=com_content&view=article&id=70:ho w-to-avoid-getting-a-3d-headache-while-watching-avatar&catid=41:feature





Which makes perfect sense, since it means that if you tilt your head,
you don't swap images between left and right eyes. A very clever use of CP.

Model of 2 element multi polarization.

http://users.sdsc.edu/~unwin/art/Picture6.png
http://users.sdsc.edu/~unwin/art/Picture7.png
http://users.sdsc.edu/~unwin/art/Picture10.png
http://users.sdsc.edu/~unwin/art/Picture11.png

On Sun, 21 Feb 2010 19:45:03 -0800 (PST), Art Unwin
wrote:

Model of 2 element multi polarization.
http://users.sdsc.edu/~unwin/art/Picture6.png
http://users.sdsc.edu/~unwin/art/Picture7.png
http://users.sdsc.edu/~unwin/art/Picture10.png
http://users.sdsc.edu/~unwin/art/Picture11.png

I don't see a model. There is no .EZ, .GAA, .N4W or .NEC file for me
to play with and tear apart. I can't even tell what the antenna looks
like from what you've posted.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Feb 21, 11:18*pm, Jeff Liebermann wrote:
On Sun, 21 Feb 2010 19:45:03 -0800 (PST), Art Unwin

wrote:
Model of 2 element multi polarization.
http://users.sdsc.edu/~unwin/art/Picture6.png
http://users.sdsc.edu/~unwin/art/Picture7.png
http://users.sdsc.edu/~unwin/art/Picture10.png
http://users.sdsc.edu/~unwin/art/Picture11.png

I don't see a model. *There is no .EZ, .GAA, .N4W or .NEC file for me
to play with and tear apart. *I can't even tell what the antenna looks
like from what you've posted. *

--
Jeff Liebermann * *
150 Felker St #D * *http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann * * AE6KS * *831-336-2558

You have two elements each located with x,y and z co ordinates at
each end, so you make your own file to suit the program you intend to
use or is available.
Surely you can model anything if you know the end locations of the
elements. If you are unable to do that then may be it is better that
you don't. There are to many programs around for me to make files for
every body and every program that is available so I supplied x,y,z co
ordinates which every body can translate.These are the points you
should look for to determine what the antenna looks like. Either way I
have supplied the results to save you the work.

On Sun, 21 Feb 2010 21:44:56 -0800 (PST), Art Unwin
wrote:

On Feb 21, 11:18*pm, Jeff Liebermann wrote:
On Sun, 21 Feb 2010 19:45:03 -0800 (PST), Art Unwin

wrote:
Model of 2 element multi polarization.
http://users.sdsc.edu/~unwin/art/Picture6.png
http://users.sdsc.edu/~unwin/art/Picture7.png
http://users.sdsc.edu/~unwin/art/Picture10.png
http://users.sdsc.edu/~unwin/art/Picture11.png

I don't see a model. *There is no .EZ, .GAA, .N4W or .NEC file for me
to play with and tear apart. *I can't even tell what the antenna looks
like from what you've posted. *

You have two elements each located with x,y and z co ordinates at
each end, so you make your own file to suit the program you intend to
use or is available.

I do not have two elements. I can't located them in x, y, or z
because you didn't specify any such coordinates. I can make a
suitable NEC deck, but *YOU* need to supply the numbers.

Surely you can model anything if you know the end locations of the
elements.

I certainly can. Now, can you supply those end locations? While your
at it, the height above ground, element diameter, material
composition, etc might be good to disclose.

Also, why make me do all the work? You have obviously created a data
file for some unspecified NEC2 modeling program. Why not just post
the model?

If you are unable to do that then may be it is better that
you don't.

Try not. Do... or do not. There is no try.
Yoda

There are to many programs around for me to make files for
every body and every program that is available so I supplied x,y,z co
ordinates which every body can translate.

Yep. Pick one.

These are the points you
should look for to determine what the antenna looks like.

These are what points? You haven't supplied any numbers.

Either way I
have supplied the results to save you the work.

Generous of you. If you don't disclose any numbers, it's not a model.
It's a bad joke. Try harder.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

On Feb 22, 3:45*am, Art Unwin wrote:
Model of 2 element multi polarization.

http://users.sdsc.edu/~unwin/art/Pic.../Picture11.png


and this proves what?