[TowerTalk] quad

[Tom Rauch]

Hi Tom,

Yes, I see how confusing it is to thing of a quad as two 1/4 wl end-
loaded dipoles rather than two bent half waves, but there is an 
important distinction.

A bent 1/2 wave dipole still has noticeable radiation in the far-field 
from the bent ends. A quad has close spaced equal and out-of-
phase currents in the same area, and so those sections have 
virtually no far-field effect at all on the system. Other than coupling 
power to the other half, and end-loading, they might as well not 
even exist electrically.


Any way we prefer to describe it, we are still left with two 1/4 wl 
long end-loaded radiating sections that are stacked 1/4 wl apart 
and fed in-phase. That's what is really important.




73, Tom W8JI
w8ji@contesting.com

--
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com