[TowerTalk] Crossed Dipoles....

[Tom Rauch]

My ASCII drawing was a little messed up. Someone sent me a 
better way to do it.

Let me try again using his style.

> If you simply parallel the dipoles at the feedpoint with no phase 
> shift, the pattern would be just like a single dipole with maximum 
> radiation at right angles to a line bisecting the in-phase wires. 
> 
> So if you have ends like this from a top view:
> 
							A
							I
							I
							I
				X-------------------------------Z
							I					
							I
							I
							B

If you feed these two dipoles so X and A (and Z and B) are in-
phase, the pattern will be a figure 8 flat on the page with the main 
lobes upper right and lower left.

If you feed these dipoles so X and B (and Z and A) are in-phase, 
the pattern will be a figure 8 with the main lobe upper left and lower 
right.

The only way you get an "omni" pattern is with a 90 degree phase 
shift at the feedpoints. Otherwise your "crossed dipole" is just a 
bow tie dipole laid flat, with a conventional dipole-like pattern.

That should be clearer I hope now that I stole a better ASCII 
drawing.
73, Tom W8JI
w8ji@contesting.com

--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm