[Antennas] Radial Wires VS a wire or screen mesh

Sun Nov 15 13:48:26 EST 2009

My verticals are rohn 25 with a big insulator 10' up on top of one section.
The feedline runs to the 10' level where the shield is connected to the base
plate for the insulator, the radials are attached to stainless bolts through
the same plate.  The wire fence I use is welded 2"x4" mesh, 4' wide.  I have
100' piece running from the center of the array out past each vertical and a
50' piece at right angles to it under each vertical.  I just took a piece of
wire and used a 1/8" cable clamp to clamp to a spot where the 2 pieces of
fencing cross and then a bigger clamp to connect to the base of the rohn 25.
You can see some pictures at:
http://www.k1ttt.net/2007towerwork2.html
http://www.k1ttt.net/2007towerwork3.html
http://www.k1ttt.net/2007towerwork4.html

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net

> -----Original Message-----
> From: Gary K9GS [mailto:garyk9gs at wi.rr.com]
> Sent: Sunday, November 15, 2009 16:25
> To: antennas at mailman.qth.net
> Subject: Re: [Antennas] Radial Wires VS a wire or screen mesh
> 
> I have an 80M ground mounted vertical (modified HF2V) with ~25 X 65 foot
> long radials.  Two weekends ago I put down 100 feet of 2 foot wide chicken
> wire ground screen.  The chicken wire is laid out roughly in the shape of
> an
> X...not a +...if that makes sense.  The radials are insulated wire and the
> ground screen is simply laid on top of the radials with no effort to bond
> them together except at the base of the antenna.
> 
> I'm curious how K1TTT bonded the mesh and connected them to the feedline?
> What I did was purchase 4 pcs of galvanized steel perforated stock.  This
> stuff is available at Home Depot and is ~2" wide and perforated with a
> 3/8"
> diameter hole about every inch.  I cut each 4 foot piece in half...making
> two two foot pieces which fits nicely across the two foot wide chicken
> wire.
> I folded the ends of the chicken wire over 4 times...about 2" wide and
> then
> sandwiched this between the two pieces of perforated stock.  About every 3
> or 4 holes I use a 1/4-20 bolt that I torque down very tightly.  Prior to
> bolting the perforated stock together I liberally brushed the perforated
> stock/chicken wire with penetrox/conductive grease.....quite a mess to
> handle :))
> 
> At the base of my vertical I have one of the Lance Johnson radial plates.
> In addition to terminating all of my radials, I then used two of the
> perforations per "chicken wire radial" to bolt directly to the radial
> plate...they use 1/4-20 bolts already.
> 
> The chicken wire was also purchased at Home Depot and comes pre-cut in 25
> foot rolls.  It was pretty cheap and I figure if I can get a season or two
> before replacing it will be worth it.  I'll probably roll the chicken wire
> up in the spring.
> 
> I have noticed a substantial improvement on 80M and 40M in what I am able
> to
> work.  The tuning did change slightly...that's the next thing I have to
> adjust before it snows ;)
> 
> 
> 73,
> 
> Gary K9GS
> ++++++++++++++++++++++++++++++++++++++++++++++++
> K9GS
> Gary Schwartz           email: k9gs (at) arrl.net
> Check out K9NS on the web: http://www.k9ns.com
> Society of Midwest Contesters (SMC)     http://www.w9smc.com/
> GMDXA http://www.eng.mu.edu/gmdxa/
> ++++++++++++++++++++++++++++++++++++++++++++++++
> 
> ----- Original Message -----
> From: "K1TTT" <K1TTT at ARRL.NET>
> To: <antennas at mailman.qth.net>
> Sent: Sunday, November 15, 2009 5:47 AM
> Subject: Re: [Antennas] Radial Wires VS a wire or screen mesh
> 
> 
> >I use 2"x4" mesh fence wire under my raised radials on my 80m 4-square.
> > When I first did the installation I did measurements as I added radials
> to
> > the first vertical and then as I rolled out 150'x4' in a cross pattern
> > under
> > the vertical.  There was much more change going from 4 to 8 raised
> radials
> > than there was in adding the screen, but it did seem to help a bit.  The
> > wire in that fencing is much heavier than chicken wire and I have gotten
> 5
> > or 6 years out of it so far.  I roll it up in the spring so I can cut
> > grass/weed under it and roll it out again before the fall contests and
> > snow
> > start flying.
> >
> >
> > David Robbins K1TTT
> > e-mail: mailto:k1ttt at arrl.net
> > web: http://www.k1ttt.net
> > AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> >
> >
> >> -----Original Message-----
> >> From: K2RS [mailto:K2RSonline at comcast.net]
> >> Sent: Sunday, November 15, 2009 02:21
> >> Cc: antennas at mailman.qth.net
> >> Subject: Re: [Antennas] Radial Wires VS a wire or screen mesh
> >>
> >> The contest station with the chicken-wire ground system for its 160
> >> antennas is always near the top of the multi-multi category in major DX
> >> contests and manages to rack up lots of Qs on 160 meters. So, while the
> >> chicken wire might not be optimal, it works in the real world and, in
> >> the end, that's all that really counts.
> >>
> >> Jack   K2RS
> >>
> >> Terry Conboy wrote:
> >> > This is probably fine as far as it goes.  The problem is that with
> only
> >> > 4 rolls of chicken wire, there is still a lot of soil between the
> >> > conductive mesh.  The idea of using a large number of wire radials is
> >> > to
> >> > provide a path for the RF displacement current back to the base of
> the
> >> > antenna that only involves a very short distance for current flowing
> in
> >> > the poorly conductive soil until it reaches a good conductor.
> >> >
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