About five years ago, as part of a test I I built an 80m ground mounted four
squared nested inside my 160m ground mounted four square. The 80m array
never did perform well. The impedances and SWR were normal but, in fact, it
performed poorly. As soon as I moved the 80m array outside and away from
the 160m array, it performed really well.
YMMV. . .73. . .Dave, W0FLS
-----Original Message-----
From: Tree
Sent: Tuesday, January 28, 2020 9:46 AM
To: Paul F. Merrill
Cc: 160 ; 160digital@groups.io
Subject: Re: Topband: 4SQ Arrays in proximity
W7IV asks:
" --I am planning a 160m TX 4SQ and another for 80M. Their centers are
going to be about 300' apart - is this far enough away? I have a little
bit of room to move them apart, but am lucky enough as it is to have the
space to get this. The closest verticals will be about 200' apart."
My experience supports the post K9YC just made that you don't need to worry
about this.
I used to have an 80 meter 4 square with my 160 meter TX antenna right in
the middle of it and
everything worked great. You can also see this in the ON4UN antenna
system.
73 Tree N6TR
On Tue, Jan 28, 2020 at 12:33 AM Paul F. Merrill <marinesvcs@gmail.com>
wrote:
HI - I have a couple questions -
--I am planning a 160m TX 4SQ and another for 80M. Their centers are
going to be about 300' apart - is this far enough away? I have a little
bit of room to move them apart, but am lucky enough as it is to have the
space to get this. The closest verticals will be about 200' apart.
--I'll be using N6BT vertical dipoles, so there will be no radial issues.
--WRT TX chokes - I'm worried about constructing feedline chokes for the
feedpoints and still having enough cable (.85vf) to get to the phasing
box. How have others done this? Do you have a choke and did you add it
to
pre-cut phasing lines or did you wind the chokes and work backwards
towards
the center to get the required electrical or physical length? Did you
used
magnet wire for the choke instead of coax?
I've come across N6RO's helpful 2017 writeup of his 4SQ refurbishment and
it touches on these issues. Anyone else have time to share some wisdom?
Thanks in advance, Paul / W7IV
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