Frank
I agree with you if the elevated radials are "resonant" .� However my
experience is the direct opposite with non resonant radials� for my
elevated system. Mine are 90' long for 160M. So far this year I have
worked 118 countries (102 confirmed) since getting back on the air�
starting in May of this year. A little harder since we don't ( I can
speak from prior experience) get as good� propagation typically to
Europe and over the pole here in Florida as you guys up north get.
There was an article in the Spring 1997 Communications Quarterly by K5IU
extolling the virtues of non resonate radials and how to match them
which got me headed down the path. I could post a copy� I suppose but I
need to have an understanding about the copy rights first.. You may find
a copy on the web if you google long enough.
DaveNR1DX
On 12/18/2019 4:10 PM, donovanf@starpower.net wrote:
Hi Csaba,
My experience is that an extensive radial system on the ground performs
significantly better than a few elevated radials. I suspect its
difficult to
obtain nearly equal currents among a small number of elevated radials.
There is nothing wrong with gull wing elevated radials, but in my
experience
they shorten the effective length of the vertical.
73
Frank
W3LPL
----- Original Message -----
From: "HA3LN" <csaba@ha3ln.hu>
To: donovanf@starpower.net
Sent: Wednesday, December 18, 2019 8:57:40 PM
Subject: Re: Topband: Temporary antenna suggestion for 160
Hi Frank,
So the gull-wing elevated setup should be dropped from the performance
point of view, right?
I have a 26m spider-pole and just wondering how to setup the radials for
that but considering you wrote no sense to make the radials into
gull-wing then.
Thanks and 73!
Csaba HA3LN / HG3N
http://ha3ln.hu/
On 2019-12-16 22:04, donovanf@starpower.net wrote:
Hi Mike,
Years ago my 4-square transmitting array used "gull-wing" elevated
radials sloping 45 degrees from the feedpoint at ground level to about
ten feet high.
When I replaced the radials with sixty 120-foot radials laid on the
ground
I had to shorten the verticals by about five feet to maintain resonance,
suggesting that the current at the bottom five feet -- or so -- of
the verticals
was attenuated by the sloping radials in close proximity to the
verticals.
As an aside, the performance of the array improved dramatically...
73
Frank
W3LPL
----- Original Message -----
From: "Mike Waters" <mikewate@gmail.com>
To: "thoyer" <thoyer1@verizon.net>
Cc: "topband" <topband@contesting.com>
Sent: Monday, December 16, 2019 8:52:41 PM
Subject: Re: Topband: Temporary antenna suggestion for 160
CORRECTION
It was just pointed out to me that I neglected to mention that the
feedpoint on my 160m inverted-L was much lower than 10 feet high!
The tuner sits on the earth, and the two wires go straight up from
that to
the insulator block holding the antenna and the radials, which is
less than
4 feet high.
From that point, the two radials angle upwards at roughly 45� (?) to
nearby
trees, and level out at 10' high to the North and to the South all
the way
to the ends. (The South radial zigzags back and forth since the distance
from the base to the neighbor's fence in that direction is less than 1/4
wavelength.)
I had photos of it online, but w0btu.com crashed. Looking for a place to
upload it to.
I hope this makes sense. Sorry for the lack of details below.
73, Mike
W0BTU
On Sun, Dec 15, 2019, 8:22 PM Mike Waters <mikewate@gmail.com> wrote:
Do the inverted-L, but use at least two 10' high 1/4 wave radials.
Do NOT use an RF ground rod, or any radials on or near the earth. Just
connect the coax shield to the junction of the radials and any remote
tuner. At that point a good choke balun is necessary.
Leaving out the choke or grounding the shield will result in very poor
performance.
73, Mike
W0BTU
On Sun, Dec 15, 2019, 7:04 PM thoyer via Topband
<topband@contesting.com>
wrote:
With only 9 more to go for DXCC on 160 and all of the recent posts
about
how good the band has been recently "best in years....) I find
myself with
no
antenna for the low bands and cringing after each post on how good the
band has been.
...
Options - I have a 45' tower with TH6DXX, 6m and 2m yagis. I could
easily
string a makeshift inverted L with about 45' vertical and around 100'
horizontal. This I could string up in a few hours. the Horizontal
portion
would be pointed south. Not the best of configurations but that's
what I
have to work with. ...
Tom
W3TA
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband
Reflector
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband
Reflector
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband
Reflector
--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|