[TowerTalk] Balanced Feedline for Ground Mounted Vertical?

[Jim Brown]

On Mon, 25 May 2009 17:12:49 -0700, Michael Tope wrote:

>Would the feedline radiation really be any lower with the 5 wire "cage" 
>configuration compared with a balanced two-wire line if there were an 
>imbalance in the center conductor and return currents?

Not necessarily. Radiation is a far field thing, and is the result of the 
sum of all the fields produced by the line. Feedline radiation is 
directly related to imbalance -- that is, it is proportional to common 
mode current. So the radiation from the line really depends on the degree 
of imbalance, which in turn depends on how the antenna and transmitter 
are coupled to the line. 

73,

Jim K9YC