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MULTIBAND ONE ELEMENT VEE BEAM BY LA0HV
PETER OF NORWAY ---
ON A GREAT DESIGN!
instructions for the multiband one element Vee beam were taken
various emails from Peter, LA0HV with added comments by the original
designer of the ONE
ELEMENT VEE BEAM, Darrell, KB4XJ
Some contents edited
for clarity.....excuse any spelling errors...
English is not Peter's
A Six Band One Element
20 meters thru 6...cool!
really turned my antenna farm upside down! And what a relief.
loves me again!
It reduced the antenna farm from several Quads and 3
element junior beams for several bands into the latest one element
A 6 band one element horizontal V-beam covering 20, 17, 15, 12,
10 and 6 meters!
Giving from 2.1 dBd (thatís over a dipole) on 20
meters to 10.8 dbd on 6 meters."
Design is simple:
Double Extended Zepp design for 6 meters using 1/2 inch or larger element
material such as EMT, copper or aluminum. Copper is heavy! DO NOT USE WIRE
(design freq. 51.110 MHz - "down under DX window")
Each element will be
12.33 ft per side.. Feeder must be 400-600 Ohm ladder wire for at least
2.64 ft. ( See Design calculator below
Mount it in a 90 degree angle just like the "KB4XJ" Horizontal
(I have not experimented with any other angles)
connect a 4 ft 400 Ohm ladder wire.
Connect a 4:1 CURRENT balun at the
end of the ladder line (balun design must cover 6 meters)
remote tuning unit directly to
the balun (ATU must cover 6 meters) for example, the LDG RT11
ATU. A GREAT TUNER!
The ATU is not a good solution for "normal" beams,
because you cant tune all the other elements so easy.
But this is a ONE
element beam so it WORKS GREAT!
Connecting a tuner directly at the feed
point (the balun) will give a TRUE MATCH, not just a happy
(Don't use a "by the rig" tuner, it won't do
Look at the dimensions and GAIN of this antenna:
One element + wire is 1/4 wave. Gain: 2.1 dBd. Fb > 18 dB
Almost a 1/2 wave dipole. Gain: 2.8
On 15m: 1/2 wave dipole. Gain: 3.3
On 12m: A little longer: 4.0 dBd
On 10m: The antenna is a little
out of band but the Balun and RT11 tuner does the job. Gain: 5.8 dBd
6m: EDZ v-beam. Gain: 10.8 dBd. Fb > 25 dB
ALL WITH ONE ELEMENT
Now isn't that cool!
Vy 73 LA0HV, Peter
Use this handy calculator for your experiments:
allow your browser to run blocked content,
scripts and Active X
controls to use calculator)
OR USE THESE
one leg =
630/freq mhz = ft
ladder line = 135/freq mhz = ft
Here is the basic
The TriDouble dipole has two elements of
3/4 wavelength each.
It has resonance at the design freq but the
impedance is high (500 Ohm) and the reactance/inductance value changes
greatly when you change frequency.
To compensate for this you
shorten the element length a bit and add open wire, 400-600 Ohm (not
critical). This will decrease impedance to 200 Ohm at the design
This is why I use a 4:1 Current balun (must be a current
This is the Extended Double Zepp, EDZ design parameters:
Length of each element: 0.64 x l
Minimum length of ladder wire:
0.137 x l
Now the great side effect is, that the antenna will work
as good as, or
better than a dipole at any frequency higher than the
frequency that match a 1/4 wavelength at one of the elements.
an open wire feeder, it will also work at the lowest freq and up,
corresponding to a 1/4 wavelength, when you add the element length to the
wire length. But now of course, gain will decrease because the ladder wire
will be a part of the antenna.
Now the EDZ will be easily matched with
a remote ATU that can handle rapidly changing reactance/inductance values.
A remote ATU that can handle swr of 1:10 will do the work
Back to the V-beam design:
EDZ-V-beam with design freq at 51.110 MHZ will work with very high forward
gain at the design freq, and as a normal "KB4XJ" V-beam at the 15 meter
band (look at the element length).
Using open wire feed, minimum 4 ft
(longer is Ok, but remember it is a part of the antenna at frequencies
under 21 MHz), will give an easy match from 14 MHz and up.
Conclusion: The trick is to use
open wire, a 4:1 balun and a Remote ATU like the LDG RT11 TUNER connected
directly to the balun.
Vy 73, Peter
Emails RECEIVED AS OF (11-12-02 ) from Peter LA0HV and
Hi Darrell & Don.
I just finished the last
experiment of the year. It's snowing heavily now in Norway, 1 ft per hour!
Minus 10 deg Celsius .... Brrrr
Last experiment revealed something very
interesting about the current in the elements of the V-Beam:
I made the
KB4XJ 15m V-Beam design using thin wire, same length and angle.
happened: Field strength measurement now showed a major back loop and a
decrease of forward gain (almost no front to back). You can say that the
Beam effect almost disappeared.
I then took 1.25" kopper (copper)
tubes, same length and angle, and all of a sudden I got a V-beam again.
Back loop gone, forward gain increased to almost 6 dB !!!!!!!!!!
.. conclusions from a freezing cold, windy Norwegian Hill-top is:
"fat" element is turning the design from a resonant V-wire antenna into a
Aperiodic (stable current) element V-Beam. The thick elements are doing
the same job as a terminator in a Rhombic design . WOOOW
Freezing smiles from LA0HV.
Vy 73 Peter
Darrell & Kay Koranda [mailto:kb4xj at strato.net]
November 2002 01:16
To: Peter Grun
Re: Developing a 6 band Single
element horizontal V Beam
The Field Strength Meter and
I checked across the back side of the V beam and
showed a field strength reading of a .1. At the sides of the front ends
power rose .5 and just inside the ends power rose to a 1. In the near
center power rose 2. and in the dead center it was a 3. In just the field
strength reading I was figuring around 28 db difference between front to
back. In the tests I made I was using 10 watts of power. The antenna
performed very good 2 years ago when I first truly tested it on field day
2001. Field day 2002 was not as good, problems with generator, blowing
rain. Anyway back to the Horizontal V, in my early study on long wire
antennas it was noted that power was related to one wire and that when a
wire had a twin, the power doubled. Further study of log periodic dipoles
(when a log dipole is bent forward it will have an added gain of 2.5 db.,
it was also found the beginning horizontal V was a 1/4 wave. Now in my
experience I found that induction between the elements changes the
resonant frequency and lowers the frequency of a dipole and as a result
you have to add 2 inches per side to make up for the induction factor. In
your 90 degrees configuration, the higher you go in frequency the broader
the front lobe should be, in that a horizontal V at 90 degrees at 1/4 wave
on design, at longer wavelengths the V angle can be narrowed down, but the
antenna does work and I wonder why it was never truly correctly reported,
not having the works of Dr John Klause at hand. I spent 4 months
researching the horizontal V antenna, and I spent over a month refining
the center mount and have the antenna and mount down to a lean 7 pounds!
----- Original Message -----
From: Peter Grun
To: 'Darrell & Kay Koranda'
Sent: Friday, November 08, 2002
Subject: SV: Developing a 6 band Single element horizontal V
The pointing right up idea of yours is also
great. I once did that experiment with a 2 element for 80 meter. For a
long time I irritated me that the G5RV did not perform well. I found out
that when you are using an Inverted V type antenna over a sandy or rocky
soil, it does not work. (I live on a rocky hill). The ground is absorbing
the E-field. The reason why the Inverted v type antennas like the G5RV
works for most people, I think, is because the Earth with a good
ground-mirror soil works as a Fire Back reflector.
So I took a 80meter
dipole and mounted a reflector between the dipole and ground, the "beam"
pointing directly in thy sky. The effect was tremendous! Within a 1000
miles range nobody understood how my signal could "hit" them with such an
extreme powerful strength. It was a 80 meter contest winner antenna. I
think that it also is a good DX antenna, the only problem is that stations
within 1000 miles is "bending" your S-meter, so you really need extremely
strong filters to be able to work in the DX-window.
Back to your
V-beam: I don't understand how it is possible to actually get a good
FB-ratio on the V-beam. I did some field strength readings and I am still
surprised!!! It's so cool! Now talking about "cool" winter is closing in
on me here in Norway so I have to wait until April for more
Haven't got any RTTY at the moment, but will get some
equipment during the winter, I will look for you on 15 then.
de LA0HV, Peter
Fra: Darrell &
Kay Koranda [mailto:kb4xj at strato.net]
Sendt: 7. November 2002
Till: Peter Grun
Emne: Re: Developing a 6 band Single element
horizontal V Beam
Hi Peter, Did you do any Field Strength readings
yet? That is what shocked me with the original design of the horizontal V
design on 15 meters. The very high increase in forward field strength in
the antenna and the decrease to the rear, could hear 360 degrees but could
see a noticeable increase on the S-Meter when you rotated to the right
direction. It's really nice that the antenna can be rotated with a cheap
TV rotator, I'll have to try your modified version. I was thinking of
trying another experiment but haven't had the time to do it yet, I was
thinking of pointing the V straight up and using the sky to bounce off of
or launching at a 30 or 40 degree and up, of the two experiments I think
the second may be of a better. In the first your pulling the signal
straight down out of the sky and shooting them back up and scattering. In
the second your pulling signals down in a direction and shooting back in
the same direction. The first pointed up has the advantage of making your
antenna appear to be say; 75 miles up with nearly omni coverage. The
second pointed off with a 30 or 40 degree rise should provide longer
distance. This is what I think will happen, the extended double zepp is
basically a 3/4 wave antenna shorted to 5/8 wave with a 1/8 wave of ladder
line, I have one but haven't tried it in the V configuration yet. I have
time constraints and have to go off and work. If you operate rtty, (I
operate around 21.278 MHz), my current project is connecting my new radio,
a Patcom PC 9000, to my Pakrat 232 TNC and then to an old laptop for some
portable rtty with the One Element Beam with Solar Power. Have yet to get
the charge controller for the solar panel. I am using a string of silicon
diodes to drop the voltage to 13.8 volts DC. Got to go, good by for now,
hope we can exchange information later. Darrell KB4XJ
EDITORS NOTE from N4UJW:
"In the true spirit
of Amateur Radio, Peter saw the original plans for the ONE ELEMENT BEAM on this site and saw that an improvement could be made to
this fine design which you have just seen AND HAS SHARED IT WITH ALL OF
EXPERIMENT! EXPERIMENT!........ 73 N4UJW
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