I have some 6ft wide chicken wire I can roll out on top of my existing
radial field for 160. Does anyone have an idea what this might do?
W0MU
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Message: 1
Date: Sun, 3 Jun 2018 16:14:45 -0400
From: Peter Bertini
To: topband@contesting.com
Subject: Re: Topband: Adding chicken wire or mesh on top of radial
field
Message-ID:
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From: Topband on behalf of W0MU Mike Fatchett
Sent: Saturday, January 27, 2018 11:55:10 AM
To: topband@contesting.com
Subject: Topband: Adding chicken wire or mesh on top of radial field
I have some 6ft wide chicken wire
Rob Sherwood did some experiments with groundscreen and radials. You can
see his slideshow here: http://slideplayer.com/slide/5717782/
I'm planning something similar at my new QTH but still trying to work out
the mechanical aspects of using screen and radials (bonding etc.).
Mike N1TA
On Jan 29
My experience it helped a lot on top of my minimal 160 radial field by
adding much wire square footage to the ground radials. It might not add
much improvement to a very extensive 160 radial field however. Expect your
SWR to increase somewhat.
AF9O
On Sat, Jan 27, 2018 at 11:55 AM, W0MU Mike Fat
i36>
From: Topband on behalf of Eugene Colton
Sent: Monday, January 29, 2018 10:50:43 AM
To: W0MU Mike Fatchett
Cc: topband@contesting.com
Subject: Re: Topband: Adding chicken wire or mesh on top of radial field
My experience it helped a lot on top of my minimal 160 radial field by
addin
Why would bonding the added matting be required if it is laid over or
beneath an existing radial field? It reduces ground losses regardless.
Peter
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Peter:
Is this a question or what you are saying is a know fact?
I am very interested in this outcome since I will a installing a TX 4SQ
system where some existing ground radials. Over time, I have heard both
pros and cons on this subject. I would like to read some research or
documentation on th
ge-
From: Topband On Behalf Of Raymond Benny
Sent: Monday, June 4, 2018 3:05 AM
To: Peter Bertini
Cc: 160
Subject: Re: Topband: Adding chicken wire or mesh on top of radial field
Peter:
Is this a question or what you are saying is a known fact?
I am very interested in this outcome since I w
For simulating a solid conducting plate in NEC with wires, Roy Lewallen
(EZNEC author) advises 0.1 wavelength on a side squares of wires. That
would be 16m for topband. Since adding the mesh is a search for tenths
more db's, be conservative and use half his recommendation, 8m or 25'.
If a re
It is well known by DXpeditioners and an EZNEC analysis demonstrates
that verticals within 1 wavelength of the sea have greatly enhanced gain
at low elevation angles in the seaward direction. There is no need for
the antenna to be over water for that benefit. In the opposite
direction the pat
<>
Hi Grant
I don't know how many antennas do you install, I mean yourself. We all
respect this concept is just wrong.
73's
JC
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Topband Reflector Archives - http://www.contesting.com/_topband
for permanent installation it's a waste of time because thin wire
steel mesh (chicken fence mesh) will rust away in most ground in a
short time.
Recommend copper mesh but professionally it only seems to be employed
around the base pier of voltage fed towers. For a current fed tower a
lot of radia
JC,
Have you read the papers I cited? Looked at numerous reports from
DXpeditions and several antenna experts re the performance of verticals
NEAR salt water?
google "vertical antenna near salt water" for a longer list of
references re a well proven fact.
Grant KZ1W
On 6/5/2018 4:34 AM,
" x 4".
73,
Charles, W2SH
From: Topband on behalf of Rob Atkinson
Sent: Tuesday, June 5, 2018 9:08 AM
To: topband@contesting.com
Subject: Re: Topband: Adding chicken wire or mesh on top of radial field
for permanent installation it's a waste
The vertical near the sea will benefit from in-phase reflection (which is
additive) of the vertically polarized radiation. That is probably worth 3 to
6 dB, depending on the angle, etc. Ground losses, however, will still depend
on the ground and the ground system. Those losses can be high with a
Some field experiment results from 2016
Location: large farm field
Antenna: Inverted L, using two 21m masts
Note: this theoretically puts Rs at around 18 Ohm
Ground:
- Checken mesh: 6 pieces 8x1m crossed under the TX vertical, which
offers almost 100% coverage at 8m diameter
- PVC insula
Quite late in response, partly done much earlier. Sometimes I have time,
and sometimes I have a house and a spouse.
Peter's original question in this thread was why a radial and mesh mix in a
counterpoise should have the radials and mesh bonded together. That is
quite a different question than why
Assuming that copper wire mesh isn’t readily available for the screen that
leaves galvanized chicken wire mesh fence/netting or perhaps galvanized welded
wire fencing.
Would galvainzed welded wire fence be preferable for it’s welded wire joints
and heavier wire (durability) compared to chicken
I think the best vertical installations were done by old radio
engineers.
No modeling programs, but tedious solid measurements reflecting reality.
What I saw at WOO - Long Lines AT&T station is perhaps ideal setup for
vertical all band (discone) antennas.
Radiator sits on concrete base about
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