Ed,
There is a FAR better way. Check out the design by VK4YB on his QRZ
page. It's a brilliant design, and works great, enabling him to set the
distance record on the band (in 2017, I think). The key element of the
design are dimensions that carefully place the current maxima in the 120
ft ve
Couple comments:
Vertical radials: I put up a top-loaded (very) short vertical for 630m
(475-KHz). Top "hat" was two parallel 130-foot horizontal wires and
vertical was three parallel wires 43-foot long (inverted-L). Used a BIG
base loading coil but needed radials that normally would be over
On 3/6/2023 9:27 PM, Eric Norris wrote:
ON4UN's book, Guide to Low-Band DXing, has an excellent chapter on
verticals.
Yes, another quite useful resource on many topics. Its focus is 40-160M.
In addition to antennas and radial systems/counterpoises, it sheds a lot
of light on topography, as we
I operated my HF-2V vertical for about 10 years with 6 radials. Then, I
added 60 more for 66 total radials. I thatched the living bejesus out of
my back lawn, stapled down the radials bolted to a DXE SS plate, and the
lawn regrew, the radials never to be seen again.
The difference was astonishin
I too have a 6BTV. It used to have 50 radials. They were a pain in the
whatchum, always getting caught by the weed whacker. But
they made a big difference in the performance of the antenna.
Now, it has one "radial". Actually an Ufer ground, consisting of a
concrete slab, 70 feet long by 10
On 3/6/23 15:08, Jim Brown wrote:
Most (but not all) verticals need radials to transmit a decent signal.
A vertical that needs radials is a lousy TX antenna without them.
Right.
I use a 6BTV, which is a 6-band trap vertical about 24 ft tall. With a
barefoot K4 at 100W I get out quite well. O
Last summer, using spare tubing and tubing from an old 14AVQ I put up a
33-foot 1/4 wave 40 meter vertical. I laid down 32 radials of various
sized with 16 of them being 32 feet long. There is an RF choke at both
the tuner and the base of the vertical. Using this vertical I have
worked 150 c
Both the half wave and 5/8 wave antennas are complete resonant structures
without the need for radials. See L. B. Cebik's web site, www.cebik.com for
his discussion modeling half wave verticals, and little was gained by
modeling radials under them.
The reflections you are concerned about are i
A half wave needs no ground at all. Since virtually no current is flowing
into the antenna when fed at the end, no current needs to flow into a
ground. From my second-story window I use a parallel tuned circuit with the
power fed from the rig in via a link at one end, and the 1/2 wave antenna
conne
I'm just catching up reading this thread and have some questions:
What is the best way to feed a 1/2 wave or 5/8 wave vertical at ground
level? I'm guessing a link coupled matching network would be better than an
L match and would perhaps obviate the need for a feedline choke? What would
con
Keith:
I agree that typical DX propagation more commonly occurs at 25
degrees than 8. However, my situation is untypical. I'm trying to get
single band 80M WAZ. The zones that I am missing, 23, 24, 26, 27, 28,
and 30 have one thing in common. They are all very far from Maine. My
VOACAP simula
Good info Steve,
I wonder a couple of things though. First, why 8 degrees for the
takeoff angle? That puts it low enough that you're into the ground
effect suck-out zone fairly heavily. I'd have though something like 25
degrees would be a more representative angle for typical communications
use
> As I'm sure you know, you can tell when the vertical antenna is
performing better; the SWR goes up. A lossy vertical will have a low
SWR because the high ground losses are in series with the radiation
resistance and the sum comes out perversely close to 50 Ohms. A low
loss vertical is around 3
Ron:
See some interposed comments.
73,
Steve,
AA4AK
At 04:05 PM 3/3/2007, Ron D'Eau Claire wrote:
I've not tried modeling 128 radials, or at that low of an elevation angle
but your results sound good, Stephen.
Remember there are two sources of ground losses in verticals, near field and
far f
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Stephen W. Kercel
Sent: Saturday, March 03, 2007 11:28 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Vertical antennas
Fellow Elecrafters:
The discussion of verticals has inspired me to do a bit of
Fellow Elecrafters:
The discussion of verticals has inspired me to do a bit of EZNEC
modeling. I plotted the azimuthal pattern at an 8 degree takeoff
angle for several different 80 meter configurations. In all 3 cases,
I've assumed average ground.
The first case is the classical full size ve
Mike, others have given what I consider good advice on several of the points
you asked about. I'll take a crack at your question about Moxon's
counterpoise advice. I'm slowly going through Moxon's book. Its
fascinating reading, by the way, for those looking for new antenna ideas or
new ways of l
My observations. 2 years go, I put up a homebrew made of leftover
tubing 33 ft vertical using an old Hustler 5BTV mount. A 3-1/2 inch
galvanized pipe, hacksawed at one end into a 30 degree (angle) point was
sledge driven into the ground as a mount stake. It is guyed with 3
ropes at the 18-ft
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