[RFI] Common mode choke on 4 Square feedlines without skewing phasing?

[Jeff Blaine]

I've had a number of different elevated radial configurations with a 40m 
4SQ and from my personal experience the addition of ferrites to the 
individual feeds did improve the directional characteristic 
significantly.  The data is not clear because this is a subjective 
observation, and in each case the elevated radial configuration was 
improved as well.

When I put the 4sq down to ground level, with on-ground radial fields, I 
did not use ferrites on the feedlines - the feedline was buried about 1 
inch below ground level.  The directional characteristic in this 
configuration is excellent as well.

In both configurations there has been a serious coax choke at the hybrid 
on the main feedline from the shack.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 23-Jan-19 2:06 PM, Don Moman VE6JY wrote:
> On all the 4 squares here (2 on 80 and 1 on 160m) I have both buried and
> put ferrites (lots) on all the lines to the individual vertical elements.
> With the phasing lines I used there wasn't much excess length after burying
> so the ferrite beads were always the plan.  The 4 sq's tuned up and
> performed as expected and whether the ferrites are enough or not, they
> don't have any negative impact.  I routinely use them as my primary rx
> antenna on both those bands.
>
> 73 Don
> VE6JY
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