[TowerTalk] Off Center Fed Antennas

[Jim Brown]

On 6/5/2013 1:33 PM, Larry Loen wrote:
> Are you going to contend that dipoles don't work in city circumstances as
> well?

Gee, I thought I made my point quite clearly at the very beginning of 
this thread. Perhaps you should re-read it. Indeed, I observed that a 
true dipole (defined by most textbooks as a CENTER FED antenna -- that 
is, two equal lengths) is a far better choice, because it can be choked 
effectively.

The problem is that the Windom is badly unbalanced, the feedline picks 
up noise, and it needs a serious common mode choke at the feedpoint to 
kill the noise. But because it is so badly unbalanced, there is a lot of 
common mode voltage across the choke, and a choke is likely to fry with 
high power.

There's an extensive discussion of this in my Power Point on Coaxial 
Chokes. http://k9yc.com/publish.htm

73, Jim K9YC