Topband: High voltage and coupling from a vertical to adjacent coax

Jim Brown jim at
Mon Oct 8 12:52:54 EDT 2007

On Sun, 7 Oct 2007 16:58:21 +0000, Kristinn Andersen wrote:

>Am I correct that there will be high RF voltages along the entire
>vertical, all the way from the "top end" of the base inductor?

Your vertical and the feedline to the dipole CAN interact with each 
other, and the result can be bad. A VERY easy fix is to add a 
serious common mode choke to the feedline to the dipole near the 
transmitter, and another one to the feedline for the vertical near 
the base of the vertical. Detailed instructions for those chokes are 
part of


Jim Brown K9YC

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