Thanks for everyone’s input. I did some measurements.
I can do about 4 turns of 5” diameter of the coax and still reach the phasing
box, bury the cable in a few spots where it goes over a walkway in conduit. In
a few spots I have to run slightly elevated and also run up to the vertical
feed points in 45 degree angles. Its not a big deal as this is in the woods and
I do not care about esthetics. My elements are not exactly on the same
elevation, that’s why I am loosing a foot or two in length in a few of those
coax. If it was all flat, I think I could do 6 turns or so…
So, I am contemplating putting up 4 turns x 7 #31 2.4 “ cores = 4000 Ohm at 4
Mhz. Maybe I can squeeze 10 cores on there, then I would be above 5000 Ohm.
Thanks again for the inputs.
73
Andy
KU7T
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
________________________________
From: RFI <rfi-bounces@contesting.com> on behalf of Jeff Blaine
<KeepWalking188@ac0c.com>
Sent: Wednesday, January 23, 2019 12:44:51 PM
To: rfi@contesting.com
Subject: Re: [RFI] Common mode choke on 4 Square feedlines without skewing
phasing?
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<http://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
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
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