Polar Measurement setup

[thadman]

What are those users doing testing using for a Polar Measurement Rig? If you have pics, that would be fantastic!

Thanks,
Thadman

 

[Ron E]

If I were to make accurate polar measurements, I don't see a need for anything more complicated than a large lazy susan bearing and two sheets of plywood with degree markings every 5 degrees. They do make automated turntables and I suppose it wouldn't be terribly hard to make some PIC based motorized turntable rotator, but why?

 

[R-Carpenter]

I use exactly that. You could get a large Lazy Susan at furniture restorers supply stores. Prob around $20.

 

[doug20]

If I were to make accurate polar measurements, I don't see a need for anything more complicated than a large lazy susan bearing and two sheets of plywood with degree markings every 5 degrees. They do make automated turntables and I suppose it wouldn't be terribly hard to make some PIC based motorized turntable rotator, but why?

My lazy susan/MDF was easy but its the 5 degree markings that I SUCKED AT

 

[Ron E]

Well, if you wanted to get elaborate, You could get one of these:
http://www.opticsplanet.net/meade-16-lx200gps-telescopes.html
and use the hand controller.

 

[Helmuth]

Place the box on a disk to make the angle. The center of the dome is the vertical ax of the rotating point.

polar I think is not very informative.

Measure the whole range under a angle.
0,15 ,30, 45 degrees

 

[ZilchLab]

polar I think is not very informative.[/IMG] [/B]

Quite informative, actually.

You have a constant directivity beamwidth of +/- 15° there.

Tractrix, is it?

 

[Helmuth]

Quite informative, actually.

You have a constant directivity beamwidth of +/- 15° there.

Tractrix, is it?

It is a mtm 13cm and 25mm dome